Using Javascript to update text within HTML elements without affecting the structure for upcoming event listeners

I've been working on a piece of code that identifies a specific string of characters (_aff.tractionsCode) and swaps it out with another string (tractionsId). The implementation looks something like this:

content = document.body.innerHTML.replace(_aff.tractionsCode, tractionsId);
document.body.innerHTML = content;

Let's illustrate this with an example:

Assume _aff.tractionsCode is equal to {tractionsCode}

<div class="affiliate" rel="{tractionsCode}">{tractionsCode}</div>

This code should replace all instances of {tractionsCode}

The issue arises when the replacement occurs because it disrupts other JavaScript event handlers in the loaded HTML. These event handlers might not be accessible for modification.

Is there a way to search through the HTML, including its attributes like rel, make the replacements without altering the entire content?

Or, perhaps there's a more effective approach I could take?

Your assistance is greatly appreciated!

Answer №1

Oh no! What you're attempting to accomplish may be achievable with a significant amount of effort and iterating through nodes (not elements)... but why go through all that trouble? The easiest way to handle this is by using a combination of scoped templates within a subsection of the DOM and event handlers that utilize delegation.

Even though JSRender (https://github.com/BorisMoore/jsrender) has replaced the previous jQuery template plugin (https://github.com/jquery/jquery-tmpl), jquery-tmpl is still quite functional (I think Pandora still uses it). You can store templates in script blocks using a non-javascript type and easily retrieve that content to render and replace a specific subsection of the DOM:

<script id="affiliateThing" type="text/x-jquery-tmpl">
<div class="affiliate" rel="${transactionsCode}">${transactionsCode}</div>
</script>
<script>
    jQuery("#affiliateThing").
        tmpl([{'transactionsCode': 'wee'}]).
        appendTo("#someElement");
</script>

To prevent any disruption of event handlers when replacing this markup, remember to delegate events through a parent element:

jQuery("#someElement").on("click", ".affiliate", function(event){alert('wee');});

This code attaches the event handler to "#someElement" rather than the individual ".affiliate" elements, but only triggers the handler if the event originated from an ".affiliate" element.

Enjoy!

EDIT: The backend library and templating system are not crucial. However, the method is key. Combine scoped templating and delegated events, and you're set.

Answer №2

When using the innerHTML method on the body, it will overwrite all content. To avoid this, you should specifically target the text nodes that need to be replaced.

One way to achieve this is by...

document.getElementBy..('identifier').innerHTML

In the context of jQuery,

$('.className').text('text to insert');

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