Refresh Material-Ui's Selection Options

Question

Refresh Material-Ui's Selection Options

Is there a way to properly re-render the <option> </option> inside a Material UI select component?

My goal is to transfer data from one object array to another using the Material UI select feature.

{transferData.map(data => (
   <option key={some key value} value={some value}>
      {data.name}
   </option>
 ))}

Although I can see in the console that the object array updates when I trigger the handler, the updated data is not reflected on the screen. The select still displays the initial empty list of options.

I have a total of three object arrays:
Array1 - contains the original data
Array2 - stores the selected data within the Material UI select
Array3 - upon clicking a button, the data moves from Array2 to Array3

UPDATE*
After transferring the data to Array3, the options seem invisible but clickable, and do not display the same text as in Array1

javascript reactjs typescript material-ui map-function

Answer 1

Answer №1

It seems like you are passing arbitrary values to key={some key value}. This could be causing the problem.

Make sure to pass a unique value that is associated with the array object being mapped:

{transferData.map(data => (
   <option key={data.id} value={data.id}> <--- use ID as key
      {data.name}
   </option>
 ))}

This way, when the transferData changes from an empty array [] to an array of objects [{id: 'foo', name: 'Foo'}], React will know to update the UI accordingly.

For more information, refer to the React documentation on Keys.

Answer 2

It seems like you are passing arbitrary values to key={some key value}. This could be causing the problem.

Make sure to pass a unique value that is associated with the array object being mapped:

{transferData.map(data => (
   <option key={data.id} value={data.id}> <--- use ID as key
      {data.name}
   </option>
 ))}

This way, when the transferData changes from an empty array [] to an array of objects [{id: 'foo', name: 'Foo'}], React will know to update the UI accordingly.

For more information, refer to the React documentation on Keys.

Answer 3

Answer №2

Hello there, I have created a sandbox example to demonstrate data loading in React using Select components. In this example, data is loaded into the first Select component after a delay of 5 seconds using setTimeout within useEffect.

// initial data loading
const firstRender = useRef(true);
  useEffect(() => {
    if (firstRender.current) {
      setTimeout(() => {
        let data = [
          { id: 1, name: "name 1" },
          { id: 2, name: "name 2" },
          { id: 3, name: "name 3" },
          { id: 4, name: "name 4" }
        ];
        setTransferData(data);
      }, 5000);
      firstRender.current = false;
    }
  }, []);

Once you select a value from the first Select, the array linked to the second Select is populated with the selected data and displayed accordingly.

// function to populate the second Select with selected data from the first one
const handleChange = (event, object) => {
    let result = [...selectedData];
    result.push(transferData[object.key - 1]);
    setSelectedData(result);
 };

The two Select components are structured as follows:

return (
    <div>
      <Select
        defaultValue={""}
        onChange={handleChange}
        className={classes.select}
      >
        {transferData.map((data) => (
          <option key={data.id} value={data.id}>
            {data.name}
          </option>
        ))}
      </Select>
      <br />
      <Select defaultValue={""} className={classes.select}>
        {selectedData.map((data) => (
          <option key={data.id} value={data.id}>
            {data.name}
          </option>
        ))}
      </Select>
    </div>
  );

This is just a simplified demonstration (selecting the same element twice from the first Select will generate an error). Nonetheless, it showcases how data can be transferred between Select components effectively.

Answer 4

Hello there, I have created a sandbox example to demonstrate data loading in React using Select components. In this example, data is loaded into the first Select component after a delay of 5 seconds using setTimeout within useEffect.

// initial data loading
const firstRender = useRef(true);
  useEffect(() => {
    if (firstRender.current) {
      setTimeout(() => {
        let data = [
          { id: 1, name: "name 1" },
          { id: 2, name: "name 2" },
          { id: 3, name: "name 3" },
          { id: 4, name: "name 4" }
        ];
        setTransferData(data);
      }, 5000);
      firstRender.current = false;
    }
  }, []);

Once you select a value from the first Select, the array linked to the second Select is populated with the selected data and displayed accordingly.

// function to populate the second Select with selected data from the first one
const handleChange = (event, object) => {
    let result = [...selectedData];
    result.push(transferData[object.key - 1]);
    setSelectedData(result);
 };

The two Select components are structured as follows:

return (
    <div>
      <Select
        defaultValue={""}
        onChange={handleChange}
        className={classes.select}
      >
        {transferData.map((data) => (
          <option key={data.id} value={data.id}>
            {data.name}
          </option>
        ))}
      </Select>
      <br />
      <Select defaultValue={""} className={classes.select}>
        {selectedData.map((data) => (
          <option key={data.id} value={data.id}>
            {data.name}
          </option>
        ))}
      </Select>
    </div>
  );

This is just a simplified demonstration (selecting the same element twice from the first Select will generate an error). Nonetheless, it showcases how data can be transferred between Select components effectively.

Answer 5

Answer №3

Instead of using data.name, I simply utilized data to reference the string being copied to array3 from array1. This method proved successful.

Answer 6

Instead of using data.name, I simply utilized data to reference the string being copied to array3 from array1. This method proved successful.

Refresh Material-Ui's Selection Options

Answer №1

Answer №2

Answer №3

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