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</li></ul></nav></div></div></aside><main class="docMainContainer_TBSr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Components reference</span></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Core components</span></li><li class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link">Logic</span></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Logic</h1></header><style>[data-ch-theme="github-dark"] { --ch-t-colorScheme: dark;--ch-t-foreground: #c9d1d9;--ch-t-background: #0d1117;--ch-t-lighter-inlineBackground: #0d1117e6;--ch-t-editor-background: #0d1117;--ch-t-editor-foreground: #c9d1d9;--ch-t-editor-lineHighlightBackground: #6e76811a;--ch-t-editor-rangeHighlightBackground: #ffffff0b;--ch-t-editor-infoForeground: #3794FF;--ch-t-editor-selectionBackground: #264F78;--ch-t-focusBorder: #1f6feb;--ch-t-tab-activeBackground: #0d1117;--ch-t-tab-activeForeground: #c9d1d9;--ch-t-tab-inactiveBackground: #010409;--ch-t-tab-inactiveForeground: #8b949e;--ch-t-tab-border: #30363d;--ch-t-tab-activeBorder: #0d1117;--ch-t-editorGroup-border: #30363d;--ch-t-editorGroupHeader-tabsBackground: #010409;--ch-t-editorLineNumber-foreground: #6e7681;--ch-t-input-background: #0d1117;--ch-t-input-foreground: #c9d1d9;--ch-t-input-border: #30363d;--ch-t-icon-foreground: #8b949e;--ch-t-sideBar-background: #010409;--ch-t-sideBar-foreground: #c9d1d9;--ch-t-sideBar-border: #30363d;--ch-t-list-activeSelectionBackground: #6e768166;--ch-t-list-activeSelectionForeground: #c9d1d9;--ch-t-list-hoverBackground: #6e76811a;--ch-t-list-hoverForeground: #c9d1d9; }</style>
|
||
<!-- -->
|
||
<p>Logic components provide functionalities for routing, conditional processing, and flow management.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="if-else">If-Else (conditional router)<a href="#if-else" class="hash-link" aria-label="Direct link to If-Else (conditional router)" title="Direct link to If-Else (conditional router)"></a></h2>
|
||
<p>The <strong>If-Else</strong> component is a conditional router that routes messages by comparing two strings.
|
||
It evaluates a condition by comparing two text inputs using the specified operator, and then routes the message to <code>true_result</code> or <code>false_result</code> depending on the evaluation.</p>
|
||
<p>The operator looks for single strings in the input (<code>input_text</code>) based on an operator and match text (<code>match_text</code>), but it can also search for multiple words by matching a regex.
|
||
Available operators include:</p>
|
||
<ul>
|
||
<li><strong>equals</strong>: Exact match comparison</li>
|
||
<li><strong>not equals</strong>: Inverse of exact match</li>
|
||
<li><strong>contains</strong>: Checks if the <code>match_text</code> is found within <code>input_text</code></li>
|
||
<li><strong>starts with</strong>: Checks if <code>input_text</code> begins with <code>match_text</code></li>
|
||
<li><strong>ends with</strong>: Checks if <code>input_text</code> ends with <code>match_text</code></li>
|
||
<li><strong>regex</strong>: Matches on a case-sensitive pattern</li>
|
||
</ul>
|
||
<p>By default, all operators are case insensitive except <strong>regex</strong>.
|
||
<strong>regex</strong> is always case sensitive, and you can enable case sensitivity for all other operators in the <a href="#if-else-parameters">If-Else parameters</a>.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="use-the-if-else-component-in-a-flow">Use the If-Else component in a flow<a href="#use-the-if-else-component-in-a-flow" class="hash-link" aria-label="Direct link to Use the If-Else component in a flow" title="Direct link to Use the If-Else component in a flow"></a></h3>
|
||
<p>The following example uses the <strong>If-Else</strong> component to check incoming chat messages with regex matching, and then output a different response depending on whether the match evaluated to true or false.</p>
|
||
<p><img decoding="async" loading="lazy" alt="A conditional router connected to two OpenAI components" src="/assets/images/component-conditional-router-1fb27526613395545592fc9166c75c27.png" width="3532" height="3044" class="img_ev3q"></p>
|
||
<ol>
|
||
<li>
|
||
<p>Add an <strong>If-Else</strong> component to your flow, and then configure it as follows:</p>
|
||
<ul>
|
||
<li>
|
||
<p><strong>Text Input</strong>: Connect the <strong>Text Input</strong> port to a <strong>Chat Input</strong> component or another <code>Message</code> input.</p>
|
||
<p>If your input isn't in <code>Message</code> format, you can use another component to transform it, such as the <a href="/components-processing#type-convert"><strong>Type Convert</strong> component</a> or <a href="/components-processing#parser"><strong>Parser</strong> component</a>.
|
||
If your input isn't appropriate for <code>Message</code> format, consider using another component for conditional routing, such as the <a href="/components-processing#data-operations"><strong>Data Operations</strong> component</a>.</p>
|
||
</li>
|
||
<li>
|
||
<p><strong>Match Text</strong>: Enter <code>.*(urgent|warning|caution).*</code> so the component looks for these values in incoming input. The regex match is case sensitive, so if you need to look for all permutations of <code>warning</code>, enter <code>warning|Warning|WARNING</code>.</p>
|
||
</li>
|
||
<li>
|
||
<p><strong>Operator</strong>: Select <strong>regex</strong>.</p>
|
||
</li>
|
||
<li>
|
||
<p><strong>Case True</strong>: In the <a href="/concepts-components#component-menus">component's header menu</a>, click <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-sliders-horizontal" aria-hidden="true"><line x1="21" x2="14" y1="4" y2="4"></line><line x1="10" x2="3" y1="4" y2="4"></line><line x1="21" x2="12" y1="12" y2="12"></line><line x1="8" x2="3" y1="12" y2="12"></line><line x1="21" x2="16" y1="20" y2="20"></line><line x1="12" x2="3" y1="20" y2="20"></line><line x1="14" x2="14" y1="2" y2="6"></line><line x1="8" x2="8" y1="10" y2="14"></line><line x1="16" x2="16" y1="18" y2="22"></line></svg> <strong>Controls</strong>, enable the <strong>Case True</strong> parameter, click <strong>Close</strong>, and then enter <code>New Message Detected</code> in the field.</p>
|
||
<p>The <strong>Case True</strong> message is sent from the <strong>True</strong> output port when the match condition evaluates to true.</p>
|
||
<p>No message is set for <strong>Case False</strong> so the component doesn't emit a message when the condition evaluates to false.</p>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<p>Depending on what you want to happen when the outcome is <strong>True</strong>, add components to your flow to execute that logic:</p>
|
||
<ol>
|
||
<li>
|
||
<p>Add a <strong>Language Model</strong>, <strong>Prompt Template</strong>, and <strong>Chat Output</strong> component to your flow.</p>
|
||
</li>
|
||
<li>
|
||
<p>In the <strong>Language Model</strong> component, enter your OpenAI API key or select a different provider and model.</p>
|
||
</li>
|
||
<li>
|
||
<p>Connect the <strong>If-Else</strong> component's <strong>True</strong> output port to the <strong>Language Model</strong> component's <strong>Input</strong> port.</p>
|
||
</li>
|
||
<li>
|
||
<p>In the <strong>Prompt Template</strong> component, enter instructions for the model when the evaluation is true, such as <code>Send a message that a new warning, caution, or urgent message was received</code>.</p>
|
||
</li>
|
||
<li>
|
||
<p>Connect the <strong>Prompt Template</strong> component to the <strong>Language Model</strong> component's <strong>System Message</strong> port.</p>
|
||
</li>
|
||
<li>
|
||
<p>Connect the <strong>Language Model</strong> component's output to the <strong>Chat Output</strong> component.</p>
|
||
</li>
|
||
</ol>
|
||
</li>
|
||
<li>
|
||
<p>Repeat the same process with another set of <strong>Language Model</strong>, <strong>Prompt Template</strong>, and <strong>Chat Output</strong> components for the <strong>False</strong> outcome.</p>
|
||
<p>Connect the <strong>If-Else</strong> component's <strong>False</strong> output port to the second <strong>Language Model</strong> component's <strong>Input</strong> port.
|
||
In the second <strong>Prompt Template</strong>, enter instructions for the model when the evaluation is false, such as <code>Send a message that a new low-priority message was received</code>.</p>
|
||
</li>
|
||
<li>
|
||
<p>To test the flow, open the <strong>Playground</strong>, and then send the flow some messages with and without your regex strings.
|
||
The chat output should reflect the instructions in your prompts based on the regex evaluation.</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>User: A new user was created.</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>AI: A new low-priority message was received.</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>User: Sign-in warning: new user locked out.</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>AI: A new warning, caution, or urgent message was received. Please review it at your earliest convenience.</span></div></div><br></code></div></div>
|
||
</li>
|
||
</ol>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="if-else-parameters">If-Else parameters<a href="#if-else-parameters" class="hash-link" aria-label="Direct link to If-Else parameters" title="Direct link to If-Else parameters"></a></h3>
|
||
<p>Some parameters are hidden by default in the visual editor.
|
||
You can modify all parameters through the <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-sliders-horizontal" aria-hidden="true"><line x1="21" x2="14" y1="4" y2="4"></line><line x1="10" x2="3" y1="4" y2="4"></line><line x1="21" x2="12" y1="12" y2="12"></line><line x1="8" x2="3" y1="12" y2="12"></line><line x1="21" x2="16" y1="20" y2="20"></line><line x1="12" x2="3" y1="20" y2="20"></line><line x1="14" x2="14" y1="2" y2="6"></line><line x1="8" x2="8" y1="10" y2="14"></line><line x1="16" x2="16" y1="18" y2="22"></line></svg> <strong>Controls</strong> in the <a href="/concepts-components#component-menus">component's header menu</a>.</p>
|
||
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>input_text</td><td>String</td><td>Input parameter. The primary text input for the operation.</td></tr><tr><td>match_text</td><td>String</td><td>Input parameter. The text to compare against.</td></tr><tr><td>operator</td><td>Dropdown</td><td>Input parameter. The operator used to compare texts. Options include <code>equals</code>, <code>not equals</code>, <code>contains</code>, <code>starts with</code>, <code>ends with</code>, and <code>regex</code>. The default is <code>equals</code>.</td></tr><tr><td>case_sensitive</td><td>Boolean</td><td>Input parameter. When <code>true</code>, the comparison is case sensitive. The default is <code>false</code>. This setting doesn't apply to regex comparisons.</td></tr><tr><td>max_iterations</td><td>Integer</td><td>Input parameter. The maximum number of iterations allowed for the conditional router. The default is 10.</td></tr><tr><td>default_route</td><td>Dropdown</td><td>Input parameter. The route to take when max iterations are reached. Options include <code>true_result</code> or <code>false_result</code>. The default is <code>false_result</code>.</td></tr><tr><td>true_result</td><td>Message</td><td>Output parameter. The output produced when the condition is true.</td></tr><tr><td>false_result</td><td>Message</td><td>Output parameter. The output produced when the condition is false.</td></tr></tbody></table>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="loop">Loop<a href="#loop" class="hash-link" aria-label="Direct link to Loop" title="Direct link to Loop"></a></h2>
|
||
<p>The <strong>Loop</strong> component iterates over a list of input by passing individual items to other components attached at the <strong>Item</strong> output port until there are no items left to process.
|
||
Then, the <strong>Loop</strong> component passes the aggregated result of all looping to the component connected to the <strong>Done</strong> port.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="the-looping-process">The looping process<a href="#the-looping-process" class="hash-link" aria-label="Direct link to The looping process" title="Direct link to The looping process"></a></h3>
|
||
<p>The <strong>Loop</strong> component is like a miniature flow within your flow.
|
||
Here's a breakdown of the looping process:</p>
|
||
<ol>
|
||
<li>
|
||
<p>Accepts a list of <a href="/data-types#data"><code>Data</code></a> or <a href="/data-types#dataframe"><code>DataFrame</code></a> objects, such as a CSV file, through the <strong>Loop</strong> component's <strong>Inputs</strong> port.</p>
|
||
</li>
|
||
<li>
|
||
<p>Splits the input into individual items. For example, a CSV file is broken down by rows.</p>
|
||
<p>Specifically, the <strong>Loop</strong> component repeatedly extracts items by <code>text</code> key in the <code>Data</code> or <code>DataFrame</code> objects until there are no more items to extract.
|
||
Each <code>item</code> output is a <code>Data</code> objects.</p>
|
||
</li>
|
||
<li>
|
||
<p>Iterates over each <code>item</code> by passing them to the <strong>Item</strong> output port.</p>
|
||
<p>This port connects to one or more components that perform actions on each item.
|
||
The final component in the <strong>Item</strong> loop connects back to the <strong>Loop</strong> component's <strong>Looping</strong> port to process the next item.</p>
|
||
<p>Only one component connects to the <strong>Item</strong> port, but you can pass the data through as many components as you need, as long as the last component in the chain connects back to the <strong>Looping</strong> port.</p>
|
||
<p>The <strong>If-Else</strong> component isn't compatible with the <strong>Loop</strong> component.
|
||
For more information, see <a href="#conditional-looping">Conditional looping</a>.</p>
|
||
</li>
|
||
<li>
|
||
<p>After processing all items, the results are aggregated into a single <code>Data</code> object that is passed from the <strong>Loop</strong> component's <strong>Done</strong> port to the next component in the flow.</p>
|
||
</li>
|
||
</ol>
|
||
<p>The following simplified Python code summarizes how the <strong>Loop</strong> component works.
|
||
This <em>isn't</em> the actual component code; it is only meant to help you understand the general process.</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>for i in input: # Receive input data as a list</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> process_item(i) # Process each item through components connected at the Item port</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> if has_more_items():</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> continue # Loop back to Looping port to process the next item</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> else:</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> break # Exit the loop when no more items are left</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>done = aggregate_results() # Compile all returned items</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>print(done) # Send the aggregated results from the Done port to another component</span></div></div><br></code></div></div>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="loop-example">Loop example<a href="#loop-example" class="hash-link" aria-label="Direct link to Loop example" title="Direct link to Loop example"></a></h3>
|
||
<p>In the follow example, the <strong>Loop</strong> component iterates over a CSV file until there are no rows left to process.
|
||
In this case, the <strong>Item</strong> port passes each row to a <strong>Type Convert</strong> component to convert the row into a <code>Message</code> object, passes the <code>Message</code> to a <strong>Structured Output</strong> component to be processed into structured data that is then passed back to the <strong>Loop</strong> component's <strong>Looping</strong> port.
|
||
After processing all rows, the <strong>Loop</strong> component loads the aggregated list of structured data into a Chroma DB database through the <strong>Chroma DB</strong> component connected to the <strong>Done</strong> port.</p>
|
||
<p><img decoding="async" loading="lazy" alt="Loop CSV parser" src="/assets/images/component-loop-csv-66c1b53f0722b36a900632806cb32d78.png" width="3876" height="3300" class="img_ev3q"></p>
|
||
<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_BuS1"><p>For more examples of the <strong>Loop</strong> component, try the <strong>Research Translation Loop</strong> template in Langflow, or see the video tutorial <a href="https://www.youtube.com/watch?v=9Wx7WODSKTo" target="_blank" rel="noopener noreferrer">Mastering the Loop Component & Agentic RAG in Langflow</a>.</p></div></div>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="conditional-looping">Conditional looping<a href="#conditional-looping" class="hash-link" aria-label="Direct link to Conditional looping" title="Direct link to Conditional looping"></a></h3>
|
||
<p>The <strong>If-Else</strong> component isn't compatible with the <strong>Loop</strong> component.
|
||
If you need conditional loop events, redesign your flow to process conditions before the loop.
|
||
For example, if you are looping over a <code>DataFrame</code>, you could use multiple <a href="/components-processing#dataframe-operations"><strong>DataFrame Operations</strong> components</a> to conditionally filter data, and then run separate loops on each set of filtered data.</p>
|
||
<p><img decoding="async" loading="lazy" alt="A flow with conditional looping." src="/assets/images/conditional-looping-756b330b8dc690b3dab1c44cc2fb05db.png" width="1482" height="673" class="img_ev3q"></p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="notify-and-listen">Notify and Listen<a href="#notify-and-listen" class="hash-link" aria-label="Direct link to Notify and Listen" title="Direct link to Notify and Listen"></a></h2>
|
||
<p>The <strong>Notify</strong> and <strong>Listen</strong> components are used together.</p>
|
||
<p>The <strong>Notify</strong> component builds a notification from the current flow's context, including specific data content and a status identifier.</p>
|
||
<p>The resulting notification is sent to the <strong>Listen</strong> component.
|
||
The notification data can then be passed to other components in the flow, such as the <strong>If-Else</strong> component.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="run-flow">Run flow<a href="#run-flow" class="hash-link" aria-label="Direct link to Run flow" title="Direct link to Run flow"></a></h2>
|
||
<p>The <strong>Run Flow</strong> component runs another Langflow flow as a subprocess of the current flow.</p>
|
||
<p>You can use this component to chain flows together, run flows conditionally, and attach flows to <a href="/components-agents"><strong>Agent</strong> components</a> as <a href="/agents-tools">tools for agents</a> to run as needed.</p>
|
||
<p>When used with an agent, the <code>name</code> and <code>description</code> metadata that the agent uses to register the tool are created automatically.</p>
|
||
<p>When you select a flow for the <strong>Run Flow</strong> component, it uses the target flow's graph structure to dynamically generate input and output fields on the <strong>Run Flow</strong> component.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="run-flow-parameters">Run Flow parameters<a href="#run-flow-parameters" class="hash-link" aria-label="Direct link to Run Flow parameters" title="Direct link to Run Flow parameters"></a></h3>
|
||
<p>Some parameters are hidden by default in the visual editor.
|
||
You can modify all parameters through the <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-sliders-horizontal" aria-hidden="true"><line x1="21" x2="14" y1="4" y2="4"></line><line x1="10" x2="3" y1="4" y2="4"></line><line x1="21" x2="12" y1="12" y2="12"></line><line x1="8" x2="3" y1="12" y2="12"></line><line x1="21" x2="16" y1="20" y2="20"></line><line x1="12" x2="3" y1="20" y2="20"></line><line x1="14" x2="14" y1="2" y2="6"></line><line x1="8" x2="8" y1="10" y2="14"></line><line x1="16" x2="16" y1="18" y2="22"></line></svg> <strong>Controls</strong> in the <a href="/concepts-components#component-menus">component's header menu</a>.</p>
|
||
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>flow_name_selected</td><td>Dropdown</td><td>Input parameter. The name of the flow to run.</td></tr><tr><td>session_id</td><td>String</td><td>Input parameter. The session ID for the flow run, if you want to pass a custom session ID for the subflow.</td></tr><tr><td>flow_tweak_data</td><td>Dict</td><td>Input parameter. Dictionary of tweaks to customize the flow's behavior. Available tweaks depend on the selected flow.</td></tr><tr><td>dynamic inputs</td><td>Various</td><td>Input parameter. Additional inputs are generated based on the selected flow.</td></tr><tr><td>run_outputs</td><td>A <code>List</code> of types (<code>Data</code>, <code>Message</code>, or <code>DataFrame</code>)</td><td>Output parameter. All outputs are generated from running the flow.</td></tr></tbody></table>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="legacy-logic-components">Legacy Logic components<a href="#legacy-logic-components" class="hash-link" aria-label="Direct link to Legacy Logic components" title="Direct link to Legacy Logic components"></a></h2>
|
||
<!-- -->
|
||
<p>Legacy components are longer supported and can be removed in a future release.
|
||
You can continue to use them in existing flows, but it is recommended that you replace them with supported components as soon as possible.
|
||
Suggested replacements are included in the <strong>Legacy</strong> banner on components in your flows.
|
||
They are also given in release notes and Langflow documentation whenever possible.</p>
|
||
<p>If you aren't sure how to replace a legacy component, <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-search" aria-hidden="true"><circle cx="11" cy="11" r="8"></circle><path d="m21 21-4.3-4.3"></path></svg> <strong>Search</strong> for components by provider, service, or component name.
|
||
The component may have been deprecated in favor of a completely new component, a similar component, or a new version of the same component in a different category.</p>
|
||
<p>If there is no obvious replacement, consider whether another component can be adapted to your use case.
|
||
For example, many <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-component" aria-hidden="true"><path d="M15.536 11.293a1 1 0 0 0 0 1.414l2.376 2.377a1 1 0 0 0 1.414 0l2.377-2.377a1 1 0 0 0 0-1.414l-2.377-2.377a1 1 0 0 0-1.414 0z"></path><path d="M2.297 11.293a1 1 0 0 0 0 1.414l2.377 2.377a1 1 0 0 0 1.414 0l2.377-2.377a1 1 0 0 0 0-1.414L6.088 8.916a1 1 0 0 0-1.414 0z"></path><path d="M8.916 17.912a1 1 0 0 0 0 1.415l2.377 2.376a1 1 0 0 0 1.414 0l2.377-2.376a1 1 0 0 0 0-1.415l-2.377-2.376a1 1 0 0 0-1.414 0z"></path><path d="M8.916 4.674a1 1 0 0 0 0 1.414l2.377 2.376a1 1 0 0 0 1.414 0l2.377-2.376a1 1 0 0 0 0-1.414l-2.377-2.377a1 1 0 0 0-1.414 0z"></path></svg> <strong>Core components</strong> provide generic functionality that can support multiple providers and use cases, such as the <a href="/components-data#api-request"><strong>API Request</strong> component</a>.</p>
|
||
<p>If neither of these options are viable, you could use the legacy component's code to create your own custom component, or <a href="/contributing-github-issues">start a discussion</a> about the legacy component.</p>
|
||
<p>To discourage use of legacy components in new flows, these components are hidden by default.
|
||
In the visual editor, you can click <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-sliders-horizontal" aria-hidden="true"><line x1="21" x2="14" y1="4" y2="4"></line><line x1="10" x2="3" y1="4" y2="4"></line><line x1="21" x2="12" y1="12" y2="12"></line><line x1="8" x2="3" y1="12" y2="12"></line><line x1="21" x2="16" y1="20" y2="20"></line><line x1="12" x2="3" y1="20" y2="20"></line><line x1="14" x2="14" y1="2" y2="6"></line><line x1="8" x2="8" y1="10" y2="14"></line><line x1="16" x2="16" y1="18" y2="22"></line></svg> <strong>Component settings</strong> to toggle the <strong>Legacy</strong> filter.</p>
|
||
<p>The following Logic components are in legacy status:</p>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Condition</summary><div><div class="collapsibleContent_i85q"><p>As an alternative to this legacy component, see the <a href="#if-else"><strong>If-Else</strong> component</a>.</p><p>The <strong>Condition</strong> component routes <code>Data</code> objects based on a condition applied to a specified key, including Boolean validation.
|
||
It supports <code>true_output</code> and <code>false_output</code> for routing the results based on the condition evaluation.</p><p>This component is useful in workflows that require conditional routing of complex data structures, enabling dynamic decision-making based on data content.</p><p>It can process either a single <code>Data</code> object or a list of <code>Data</code> objects.
|
||
The following actions occur when processing a list of <code>Data</code> objects:</p><ul>
|
||
<li>Each object in the list is evaluated individually.</li>
|
||
<li>Objects meeting the condition go to <code>true_output</code>.</li>
|
||
<li>Objects not meeting the condition go to <code>false_output</code>.</li>
|
||
<li>If all objects go to one output, the other output is empty.</li>
|
||
</ul><p>The <strong>Condition</strong> component accepts the following parameters:</p><table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>data_input</td><td>Data</td><td>Input parameter. The Data object or list of Data objects to process. This input can handle both single items and lists.</td></tr><tr><td>key_name</td><td>String</td><td>Input parameter. The name of the key in the Data object to check.</td></tr><tr><td>operator</td><td>Dropdown</td><td>Input parameter. The operator to apply. Options: <code>equals</code>, <code>not equals</code>, <code>contains</code>, <code>starts with</code>, <code>ends with</code>, <code>boolean validator</code>. Default: <code>equals</code>.</td></tr><tr><td>compare_value</td><td>String</td><td>Input parameter. The value to compare against. Not shown/used when operator is <code>boolean validator</code>.</td></tr></tbody></table><p>The <code>operator</code> options have the following behaviors:</p><ul>
|
||
<li><code>equals</code>: Exact match comparison between the key's value and compare_value.</li>
|
||
<li><code>not equals</code>: Inverse of exact match.</li>
|
||
<li><code>contains</code>: Checks if compare_value is found within the key's value.</li>
|
||
<li><code>starts with</code>: Checks if the key's value begins with compare_value.</li>
|
||
<li><code>ends with</code>: Checks if the key's value ends with compare_value.</li>
|
||
<li><code>boolean validator</code>: Treats the key's value as a Boolean. The following values are considered true:<!-- -->
|
||
<ul>
|
||
<li>Boolean <code>true</code>.</li>
|
||
<li>Strings: <code>true</code>, <code>1</code>, <code>yes</code>, <code>y</code>, <code>on</code> (case-insensitive)</li>
|
||
<li>Any other value is converted using Python's <code>bool()</code> function</li>
|
||
</ul>
|
||
</li>
|
||
</ul></div></div></details>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Pass</summary><div><div class="collapsibleContent_i85q"><p>As an alternative to this legacy component, use the <a href="#if-else"><strong>If-Else</strong> component</a> to pass a message without modification.</p><p>The <strong>Pass</strong> component forwards the input message without modification.</p><p>It accepts the following parameters:</p><table><thead><tr><th>Name</th><th>Display Name</th><th>Info</th></tr></thead><tbody><tr><td>input_message</td><td>Input Message</td><td>Input parameter. The message to forward.</td></tr><tr><td>ignored_message</td><td>Ignored Message</td><td>Input parameter. A second message that is ignored. Used as a workaround for continuity.</td></tr><tr><td>output_message</td><td>Output Message</td><td>Output parameter. The forwarded message from the input.</td></tr></tbody></table></div></div></details>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Flow As Tool</summary><div><div class="collapsibleContent_i85q"><p>This component constructed a tool from a function that ran a loaded flow.</p><p>It was deprecated in Langflow version 1.1.2 and replaced by the <a href="#run-flow"><strong>Run Flow</strong> component</a>.</p></div></div></details>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Sub Flow</summary><div><div class="collapsibleContent_i85q"><p>This component integrated entire flows as components within a larger workflow.
|
||
It dynamically generated inputs based on the selected flow and executed the flow with provided parameters.</p><p>It was deprecated in Langflow version 1.1.2 and replaced by the <a href="#run-flow"><strong>Run Flow</strong> component</a>.</p></div></div></details></div></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/components-prompts"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Prompt Template</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/components-helpers"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Helpers</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#if-else" class="table-of-contents__link toc-highlight">If-Else (conditional router)</a><ul><li><a href="#use-the-if-else-component-in-a-flow" class="table-of-contents__link toc-highlight">Use the If-Else component in a flow</a></li><li><a href="#if-else-parameters" class="table-of-contents__link toc-highlight">If-Else parameters</a></li></ul></li><li><a href="#loop" class="table-of-contents__link toc-highlight">Loop</a><ul><li><a href="#the-looping-process" class="table-of-contents__link toc-highlight">The looping process</a></li><li><a href="#loop-example" class="table-of-contents__link toc-highlight">Loop example</a></li><li><a href="#conditional-looping" class="table-of-contents__link toc-highlight">Conditional looping</a></li></ul></li><li><a href="#notify-and-listen" class="table-of-contents__link toc-highlight">Notify and Listen</a></li><li><a href="#run-flow" class="table-of-contents__link toc-highlight">Run flow</a><ul><li><a href="#run-flow-parameters" class="table-of-contents__link toc-highlight">Run Flow parameters</a></li></ul></li><li><a href="#legacy-logic-components" class="table-of-contents__link toc-highlight">Legacy Logic components</a></li></ul></div></div></div></div></main></div></div></div><footer class="theme-layout-footer footer"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"><div class="footer-links">
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