How Can I Replace HTML Element Content Using JavaScript and Class Names?

How to Access and Modify HTML Elements by Class in JavaScript

Obtaining elements by class in JavaScript differs from using IDs due to JavaScript's lack of an in-built function for this purpose. However, a workaround can be implemented.

To modify the content within an HTML element using a class instead of an ID, you can utilize the following code:

function replaceContentInContainer(matchClass, content) {
    var elems = document.getElementsByTagName('*'), i;
    for (i in elems) {
        if((' ' + elems[i].className + ' ').indexOf(' ' + matchClass + ' ')
                > -1) {
            elems[i].innerHTML = content;
        }
    }
}

This code iterates through all elements in the document and checks if their class list contains the specified matchClass. Upon finding a match, it replaces the content of that element with the provided content parameter.

This approach ensures compatibility across browsers. Here's a practical example:

replaceContentInContainer('box', 'This is the replacement text');

<div class='box'></div>

This code replaces the content of the

with the specified text.

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