ToolJet/docs/versioned_docs/version-3.16.0-LTS/widgets/custom-component/pass-query-params-in-custom-components.md

id	title
pass-query-params-in-custom-components	Pass Query Parameters in Custom Components

In this guide, you'll learn how to trigger a query with dynamic parameters from inside a Custom Component.

We'll use a simple example: fetching a specific Todo item by passing its id as a parameter.

1. Create the Query
   First, create a REST API query and rename it to getIndividualTodo and add a parameter named id. Set the method to GET and enter the following URL under the URL property:

   https://jsonplaceholder.typicode.com/todos/{{parameters.id}}
   

   Here, {{parameters.id}} allows the query to receive a dynamic id value when triggered.

   

2. Add a Custom Component
   Drag and drop a Custom Component onto the canvas. Set the Data property as:

   {{
       { title: 'Todos', buttonText: 'Get Todo', queryData: queries.getIndividualTodo.data}
   }}
   

   This passes the title, button text, and query data to the Custom Component.

3. Add the Component Code

   Paste the following into the Code property:

   import React, { useState, useEffect } from 'https://cdn.skypack.dev/react';
   import ReactDOM from 'https://cdn.skypack.dev/react-dom';
   import { Button, Container, TextField, Typography } from 'https://cdn.skypack.dev/@material-ui/core';
   
   const MyCustomComponent = ({ data, updateData, runQuery }) => {
     const [todoId, setTodoId] = useState(1);
   
     const fetchTodo = async () => {
       try {
         const { data: todo } = await runQuery('getIndividualTodo', { id: todoId });
         if (todo) updateData({ ...data, queryData: todo });
       } catch (error) {
         console.error("Error fetching todo:", error);
       }
     };
   
     return (
       <Container>
         <Typography variant="h4">{data.title}</Typography>
         <TextField
           label="Todo ID"
           value={todoId}
           onChange={(e) => setTodoId(e.target.value)}
           variant="outlined"
           margin="normal"
           fullWidth
         />
         <Button color="primary" variant="outlined" onClick={fetchTodo}>
           Fetch Todo
         </Button>
         {data.queryData?.title && (
           <div>
             <p>ID: <b>{data.queryData.id}</b></p>
             <p>Title: <b>{data.queryData.title}</b></p>
             <p>Completed: <b>{data.queryData.completed ? "Yes" : "No"}</b></p>
           </div>
         )}
       </Container>
     );
   };
   
   const ConnectedComponent = Tooljet.connectComponent(MyCustomComponent);
   
   ReactDOM.render(<ConnectedComponent />, document.body);
   

   In runQuery('getIndividualTodo', { id: todoId }), the value of todoId is sent to the query as id via parameters. That value replaces {{parameters.id}} in the query URL when the query runs, allowing the Todo ID to be passed dynamically.

   

4. Fetch the Todo
   Now, when you click the Fetch Todo button, the getIndividualTodo query will run with the Todo ID passed as a parameter and return the details of the Todo.

   

:::note In a typical JavaScript query, parameters are passed in a manner similar to a standard function call. For example, you can specify the parameters for the query using queries.getIndividualTodo.run({ id: 2 }) :::