Error: Unable to retrieve the value of a null property | ReactJS |

There are two textboxes and one button designed as material UI components.

 </p>
        <TextField id="chatidField" />
        <br />
        <p>
          <code>Enter Your Name:</code>
          <hr />
        </p>
        <TextField id="nameField" />
        <br />
        <br />
        <Button
          variant="contained"
          color="secondary"
          onClick={addToFirebase()}
        >
          Get Your Token
        </Button>

The function called by the onClick event is defined as:

  function addToFirebase() {
  var chatid = document.getElementById("chatidField").value;
  var name = document.getElementById("nameField").value;
  console.log(chatid, name);
 }

An error message keeps appearing:

TypeError: Cannot read property 'value' of null

8 | var chatid = document.getElementById("chatidField").value;

9 | var name = document.getElementById("nameField").value;

Find the full code here: https://codesandbox.io/s/pqmrn4x

Answer №1

If you're encountering an issue with your onClick handler, make sure that you are using addToFirebase and not addToFirebase():

<Button
      variant="contained"
      color="secondary"
      onClick={addToFirebase}
    >

Remember, adding () will execute the addToFirebase function immediately as opposed to assigning it as the onClick handler. If addToFirebase() is a method within your class, consider using this.addToFirebase instead.

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