Choose a node from descendants based on its attribute

I am working with an interface that switches between displaying different div elements. Each div element has their children arranged differently, and when the switch happens, I need to access a specific child node of the newly displayed div. However, I find it frustrating that both the childNodes and children property only allow me to select children using item(index), which varies depending on the div.

In Protractor, I used webmanager.by(selector) to search for elements based on parameters other than index. Is there a similar method I can use to select the child node with data-relevant="true"? I am also questioning if using this attribute is the most effective way to specify in HTML which child node is relevant.

It's worth noting that this is an Angular application.

javascripthtmlcss

Answer №1

To target a child node with the attribute data-relevant="true" within a parent element, you can utilize the selector method

element.querySelector()
This will retrieve the first matching element...

In your specific scenario, you could use something like

parent-element.querySelector( "[data-relevant='true']" );

Alternatively, if you wish to select all paragraphs p with the attribute data-relevant set to true inside the parent div: parentDiv.querySelectorAll( "p[data-relevant='true']" );

You may refer to some examples on http://www.w3.org/TR/selectors-api/#processing-selectors

Another approach would be using a specific class to indicate which child node is relevant... you can obtain this element/elements with getElementsByClassName(someClassName)

Sample Code Using .querySelectorAll() method:

<script type="text/javascript>

    window.addEventListener("load", init, false);

function init(){
    var parentDiv = document.getElementById("divWithChildren");
    var relevantChildren = parentDiv.querySelectorAll( "[data-relevant='true']" );
    alert (relevantChildren[2].id); // this will provide the id of the 3rd child element with data-relevant='true'
}

</script>

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