javascript - Uncaught TypeError: Cannot read properties of undefined (reading 'remove') - Stack Overflow

What's the problem in my code?

Uncaught TypeError: Cannot read properties of undefined (reading 'remove')

and

Uncaught TypeError: Cannot read properties of undefined (reading 'add')

document.querySelector("#elastic").oninput = function () {
    let val = this.value.trim();
    let elasticItem = Array.from(document.querySelectorAll(".elastic li"));
    if (val != "") {
        elasticItem.forEach(function (elem) {
            if (elem.innerText.search(val) === -1) {
                elem.classlist.add("hide");
            } else {
                elem.classlist.remove("hide");
            }
        });
    }
};

.hide {
  display: none;
}

<div>
    <input type="text" id="elastic" placeholder="Search" />
</div>

<div>
    <ul class="elastic">
        <li>ht</li>
        <li>sdf</li>
        <li>qwe</li>
        <li>cxv</li>
        <li>sad</li>
        <li>sdf</li>
        <li>dfg</li>
    </ul>
</div>

What's the problem in my code?

Uncaught TypeError: Cannot read properties of undefined (reading 'remove')

and

Uncaught TypeError: Cannot read properties of undefined (reading 'add')

document.querySelector("#elastic").oninput = function () {
    let val = this.value.trim();
    let elasticItem = Array.from(document.querySelectorAll(".elastic li"));
    if (val != "") {
        elasticItem.forEach(function (elem) {
            if (elem.innerText.search(val) === -1) {
                elem.classlist.add("hide");
            } else {
                elem.classlist.remove("hide");
            }
        });
    }
};

.hide {
  display: none;
}

<div>
    <input type="text" id="elastic" placeholder="Search" />
</div>

<div>
    <ul class="elastic">
        <li>ht</li>
        <li>sdf</li>
        <li>qwe</li>
        <li>cxv</li>
        <li>sad</li>
        <li>sdf</li>
        <li>dfg</li>
    </ul>
</div>

• javascript
• typeerror

Share Follow edited Jan 16, 2022 at 19:22 Nice18 56622 silver badges1212 bronze badges asked Jan 15, 2022 at 6:35 AKAENOAKAENO 4311 gold badge11 silver badge33 bronze badges 2

• 2 just change classlist to classList – Saeed Shamloo Commented Jan 15, 2022 at 6:37
• You can use hidden attribute instead. elem.hidden = true for hiding an element and elem.hidden = false for showing an element. – Nice18 Commented Jan 15, 2022 at 7:11

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 3

JavaScript is case-sensitive

Change
classlist to classList (l → L)

elem.classList.add('hide');

elem.classList.remove('hide');