Using a Jquery If statement to verify the margin-left property of a div in order to set opacity for a different id

I've been experimenting with various adjustments in an attempt to make this work, but so far I have not succeeded in using jQuery to verify the left margin of a div. Specifically, I am trying to check if it is positioned at left: 0px, and if so, trigger a specific action - in my case, applying opacity to a different div. You can view my code on JSFiddle. In this example, I want to examine the gray div called "trim" and if its marginLeft property equals 0 pixels, then apply the opacity effect to the div named "l1". Let me know if you require further clarification.

jquerycssif-statement

Answer №1

When using a jQuery object, remember that it does not have the property marginLeft. Instead, you should use the css method. Also, be aware that the = symbol is an assignment operator that evaluates to true. To compare values, use either == or === comparison operators.

$(document).ready(function(){
    if ( $('#trim').css('marginLeft') == '0px' ){
        $('#l1').animate({opacity:".5"});
    } else {
        $('#l1').animate({opacity:"1"});
    }
}); // Make sure to add `)` at the end

http://jsfiddle.net/5djZ4/

Answer №3

Okay, so in the example you provided

$('#trim').marginLeft

Have you considered trying this approach instead:

$('#trim').attr('marginLeft')

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