Home/ Questions/The way to fix the ''uncaught typeerror: cannot read property 'value' of null'' error?
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flofarrell
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Asked: 2022-08-03T03:41:39+00:00 In:

The way to fix the ”uncaught typeerror: cannot read property ‘value’ of null” error?

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Today I get the ”uncaught typeerror: cannot read property ‘value’ of null” error when I command this line:

var inputVal = document.getElementById("input").value;

Then I receive the error message:

TypeError: Cannot read property 'value' of null

Can someone tell me how to fix this issue?

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1 Answer

  1. Best Answer
    Expert

    The cause: The element with the id input not existing will be the cause. Let me explain it in simpler terms:

    var input = document.getElementById("input");
input // when this fails, it returns null. input = null
var inputVal = input.value;
// this is the same as the following.
var inputVal = null.value;
// null does not have the property 'value'

    Solution: You can fix this issue by making sure that btn, or any object you use, is not null before you use it. For example:

    var input = document.getElementById("btn");
var inputVal = "";
if (input) {
    inputVal = input.value;
}
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