Using jQuery to animate the grayscale filter with a value of 0

Currently, I am implementing the Waypoints jQuery plugin to add animation to a series of images as a user scrolls over them. My goal is to apply certain CSS properties - opacity:1, filter:grayscale(0), -webkit-filter:grayscale(0), and -moz-filter:grayscale(0) - when the user interacts with these images.

The opacity effect is working fine on its own and successfully achieving the desired result. However, I am facing challenges in getting the grayscale filters (filter:grayscale(0), -webkit-filter:grayscale(0), -moz-filter:grayscale(0)) to work properly. Below is the code snippet I am using. I believe the solution might be straightforward, but I am struggling to pinpoint it.

/* Waypoints
-------------------------------------------------- */
/* set-defaults
------------------------- */
    $.fn.waypoint.defaults = {
    context: window,
    continuous: true,
    enabled: true,
    horizontal: false,
    offset: 0,
    triggerOnce: true
    }

/* #about-section-two
------------------------- */
    $('#about-section-two').waypoint(function() {
    $('.avatar' ).delay(0).animate({opacity: 1, filter: "grayscale(0)", -webkit-filter: "grayscale(0)", -moz-filter: "grayscale(0)"});
}, { offset: '50%' });

Any assistance or guidance on this matter would be highly appreciated.

Sincerely, Ian

jquerycssjquery-waypoints

Answer №2

jQuery doesn't currently have an animation option for filtering grayscale. You can either wait for it to be added or use this JavaScript script instead:

function grayscale(div, millisec, bool){
    if (bool){ /* Apply grayscale effect */
        var i = 0;
        timertogray = setInterval(function addgray(){   
            if (i < 101){
                document.getElementById(div).style.filter = "grayscale(" + i + "%)"; 
                i = i + 10;
            }else{
                 clearinterval(timertogray); /* Stop timer when grayscale is at 100% */
            }
        }, millisec);
    }else{ /* Remove grayscale effect */
        var i = 100;
        timerfromgray = setInterval(function addgray(){ 
            if (i > 0){
                document.getElementById(div).style.filter = "grayscale(" + i + "%)"; 
                i = i - 10;
            }else{
                clearinterval(timerfromgray); /* Stop timer when grayscale is at 0% */
            }
        }, millisec);
    }
}

Call the function like this: 

grayscale('Content',100,true);  /* Apply grayscale effect */

grayscale('Content',100,false); /* Remove grayscale effect */

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