How to Locate the Highest z-Index Value using jQuery

When working with multiple overlaid elements, determining the highest z-index is crucial for managing their visibility and positioning. jQuery provides convenient methods to traverse and manipulate document elements, including locating the highest z-index value.

Retrieving the Highest z-Index

The following code snippet demonstrates how to find the highest z-index among a set of positioned divs using jQuery:

var index_highest = 0;
$("#layer-1,#layer-2,#layer-3,#layer-4").each(function() {
    var index_current = parseInt($(this).css("zIndex"), 10);
    if(index_current > index_highest) {
        index_highest = index_current;
    }
});

Explanation:

• The code first initializes a variable index_highest to 0, representing the lowest possible z-index value.
• It then selects all divs with IDs layer-1 to layer-4 using the jQuery selector and iterates over each div using the each() function.
• For each div, it uses the css() method to retrieve the value of the zIndex property as a string.
• It converts the string value to a number using parseInt() and the 10 radix.
• The code compares the current z-index value (index_current) with the highest z-index value encountered so far (index_highest).
• If the current z-index is higher, it updates index_highest to the current value.

By iterating through all the specified divs, the code identifies and stores the highest z-index value in the index_highest variable.