The JQuery position() and offset() functions seem to be malfunctioning

As a novice programmer, I am embarking on the challenge of creating an interesting effect for my website. My goal is to change the color of the navigation buttons when a specific element is scrolled past in the HTML document. Initially, I thought utilizing jQuery would be the best approach for this task. However, I have encountered difficulties in determining the position of elements on the page. Despite experimenting with the position() and offset() methods, I haven't been able to achieve the desired outcome.

I am particularly interested in obtaining the vertical positions of the elements identified by the IDs "info" and "security". While I understand that these methods may not always be reliable, I am struggling to identify a suitable alternative.

Here is a snippet of the code I have developed thus far:

   $(window).on('load', function(){ 
      window.loaded = true;
      console.log("LOADED");
    });
    $(window).scroll(function() {
      if (window.loaded == true){  
        var scrollTop = $(window).scrollTop();
        var infopos = $("#info");
        var secpos = $("#security");

        if (scrollTop >= 0 && scrollTop < infopos - 25) {
            $("#navgeneral").addClass("active");
            $("#navinfo").removeClass("active");
            $("#navsecurity").removeClass("active");
        }
        else if (scrollTop >= infopos && scrollTop < secpos){
            $("#navgeneral").removeClass("active");
            $("#navinfo").addClass("active");
            $("#navsecurity").removeClass("active");
        }
      }    
    });`

Your suggestions and guidance will be greatly appreciated! Thanks in advance.

Answer №1

Here is the solution provided for you.

    //Start by defining these variables
    const infopos = $( "#info" ).scrollTop();
    const secpos = $("#security").scrollTop();

    $(window).on('load', function(){ 
      window.loaded = true;
      console.log("LOADED");
    });
    $( window ).scroll(function() {
      if (window.loaded === true){ 
 
        let scrollTop = $(window).scrollTop();

        if (scrollTop < infopos-25) {     //The condition scrollTop >= 0 will always be met, so it can be skipped
            $( "#navgeneral" ).addClass("active");
            $( "#navinfo" ).removeClass("active");
            $( "#navsecurity" ).removeClass("active");
        }
        else if (scrollTop >= infopos && scrollTop < secpos){
            $( "#navgeneral" ).removeClass("active");
            $( "#navinfo" ).addClass("active");
            $( "#navsecurity" ).removeClass("active");
        }
      }    
    });`

Prioritize understanding variable usage and consider using let over var when declaring them to avoid accidental global variable overwrites.

Answer №2

The main goal is to dynamically change the navigation bar based on the scroll position. To start, you must retrieve the ID of the target scroll position. Use the following code snippet to get each anchor element's ID:

$('#testB').position().top

(Using jQuery, the position function will provide the top value only.) Next, obtain the current scroll position by using the following code:

currentHeight = $(window).scrollTop();

Then, write the relevant jQuery script to adjust the navigation elements accordingly. A sample JavaScript snippet is provided below: Assuming there are 5 DIVs (#testA to E) and 4 navigation buttons (#test1 to 4)

$(window).scroll(function () {
var currentHeight = $(window).scrollTop();
if (currentHeight <= $('#testB').position().top) {
    $("#test1").addClass('active-blue');
    $("#test2").removeClass('active-blue');
    $("#test3").removeClass('active-blue');
    $("#test4").removeClass('active-blue');
} else if (currentHeight <= $('#testC').position().top) {
    $("#test1").removeClass('active-blue');
    $("#test2").addClass('active-blue');
    $("#test3").removeClass('active-blue');
    $("#test4").removeClass('active-blue');
} else if (currentHeight <= $('#testD').position().top) {
    $("#test1").removeClass('active-blue');
    $("#test2").removeClass('active-blue');
    $("#test3").addClass('active-blue');
    $("#test4").removeClass('active-blue');
} else {
    $("#test1").removeClass('active-blue');
    $("#test2").removeClass('active-blue');
    $("#test3").removeClass('active-blue');
    $("#test4").addClass('active-blue');
}

});

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