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[Solved] Type error: Object is possibly ‘null’. TS2531 for window.document

Hello Guys, How are you all? Hope You all Are Fine. Today I have just added typescript to my project and when I am using window.document.getElementByid it give me Type error: Object is possibly ‘null’. TS2531 in javascript. So Here I am Explain to you all the possible solutions here.

Without wasting your time, Let’s start This Article to Solve This Error.

How Type error: Object is possibly ‘null’. TS2531 for window.document Error Occurs ?

I have just added typescript to my project and when I am using window.document.getElementByid it give me following error.

Type error: Object is possibly 'null'.  TS2531

How To Solve Type error: Object is possibly ‘null’. TS2531 for window.document Error ?

  1. How To Solve Type error: Object is possibly 'null'. TS2531 for window.document Error?

    To Solve Type error: Object is possibly 'null'. TS2531 for window.document Error Here TypeScript is doing its job and tells you that window.document.getElementById("foobar") COULD return something that is null. If you are absolutely sure that #foobar element DOES exist in your DOM, you can show TS your confidence with a ! operator.

  2. Type error: Object is possibly 'null'. TS2531 for window.document

    To Solve Type error: Object is possibly 'null'. TS2531 for window.document Error Here TypeScript is doing its job and tells you that window.document.getElementById("foobar") COULD return something that is null. If you are absolutely sure that #foobar element DOES exist in your DOM, you can show TS your confidence with a ! operator.

Solution 1

Here TypeScript is doing its job and tells you that window.document.getElementById("foobar") COULD return something that is null. If you are absolutely sure that #foobar element DOES exist in your DOM, you can show TS your confidence with a ! operator.

// Notice the "!" at the end of line
const myAbsolutelyNotNullElement = window.document.getElementById("foobar")!

Or, you can add a runtime nullable check to make TS happy

const myMaybeNullElement = window.document.getElementById("foobar")

myMaybeNullElement.nodeName // <- error!

if (myMaybeNullElement === null) {
  alert('oops');
} else {
  // since you've done the nullable check
  // TS won't complain from this point on
  myMaybeNullElement.nodeName // <- no error
}

Solution 2

window.document.getElementById("foobar"); Is either returning a HTMLElement or null As you might used a similar statement before: window.document.getElementById("foobar").value

Typescript is complaining, that value might not be accessible and you should explicitly check this before. To avoid this you can do the following:

const element = window.document.getElementById("foobar");

if (element !== null) {
    alert(element.value);
}

Summery

It’s all About this issue. Hope all solution helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you?

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