Tips for modifying CSS class with jQuery based on a conditional statement

I am struggling with an if statement that checks the url for "invt". My goal is to change the height of the div "promo-carriage" from its default value of 0px to 40px.

I want to accomplish this without adding or removing a class. I already know how to do it using those methods, but they don't solve my current problem.

Please have a look at the code below:


$(document).ready(function () {
    if (window.location.href.indexOf("invt") > -1) { 
        $('#promo-carriage').css({
            height: '40px'
        });
    }
});

Unfortunately, this code snippet isn't working as expected for me. Can anyone provide any suggestions? I suspect it might be a syntax error, but I'm fairly new to jQuery/JS!

jquerycssif-statement

Answer №1

To summarize, when you need to pass just one key and value pair, you can do so like this:

$(element).css("attribute","value");

However, if you want to pass multiple declarations, you should use an object instead:

$(element).css({height:"200px", width:"100px", backgroundColor: "red"});
or 
$(element).css({height:"200px"});

It's important to note the differences between the two examples. In the object, it is optional to define the key inside quotes, but it is recommended to follow JavaScript conventions without quotes and using camelCase for properties such as changing "background-color" to backgroundColor.

The syntax also changes in the object format, where you separate key-value pairs with a double colon : and different pairs with commas.

For further information, please visit http://api.jquery.com/css/

Answer №2

Utilize parentheses with the .css() and height functions enclosed in quotation marks.

$(document).ready(function () {
    if(window.location.href.indexOf("invt") > -1) {
        $("#promo-carriage").css("height", "40px");
    }
});

Answer №3

Make sure to include the opening parentheses after the css method:

$('#promo-carriage').css({

If you are looking to hide/show something, it is recommended not to use the height property for this task. It is best to utilize the CSS display property.

There are efficient jQuery methods available for altering the display of an element:

$("#promo-carriage").toggle()
$("#promo-carriage").hide()
$("#promo-carriage").show()

For a demonstration, check out this jsFiddle example.

Answer №4

'' seems to be missing for the height. Another option could be to directly utilize the height method.

$(document).ready(function () {
 if(window.location.href.indexOf("invt") > -1) { 
    $('#promo-carriage').height('40px');
      });

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