Utilizing jQuery to check for the presence of a DIV on a page and dynamically applying CSS to another DIV

Just starting out with jQuery and feeling confident about the basics, but struggling to make it all come together.

For example:
If the page contains a div with the ID of #dynamicChat, then set the height of the div with the class .prdSection to 25px. Otherwise, do nothing.

Here's what I have so far:


$('#dynamicChat'){
$('.prdSection').css('height', '25px');
}

I feel like I'm close, but probably not close at all. Any guidance would be appreciated!

*Side note: When referring to a div on a page, would I call it an element?

Thank you :)

javascriptjqueryhtmlcss

Answer №1

Check if the element with id 'dynamicChat' exists and then adjust the height of elements with class 'prdSection' to 25px.

Answer №2

There's no need for the "> 0", you can just use:

if ( $('#myElement').length ) {
// it exists
}

if ( $('#dynamicChat').length ) {
$('.prdSection').css('height', '25px');
}

Answer №3

You can easily validate the existence of an element without using jQuery:

if(document.getElementById('dynamicChat')){
    document.querySelector('.prdSection').style.height = '25px';
}

Answer №4

Check if the div with ID #dynamicChat exists on the webpage. If it does, set the height of the div with class .prdSection to 25px. If not, take no action.

   <script type="text/javascript">
        if ($('#dynamicChat').is("visible")) {
            $('.prdSection').css('height', '25px');
        }
    </script>

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