Function defaultPrefilter

2.0.3/Animation.js:259–380

(elem, props, opts)

});

function defaultPrefilter(elem, props, opts) {
    /* jshint validthis: true */
    var prop, value, toggle, tween, hooks, oldfire,
        anim = this,
        orig = {},
        style = elem.style,
        hidden = elem.nodeType && isHidden(elem),
        dataShow = data_priv.get(elem, "fxshow");

    // handle queue: false promises
    if (!opts.queue) {
        hooks = jQuery._queueHooks(elem, "fx");
        if (hooks.unqueued == null) {
            hooks.unqueued = 0;
            oldfire = hooks.empty.fire;
            hooks.empty.fire = function() {
                if (!hooks.unqueued) {
                    oldfire();
                }
            };
        }
        hooks.unqueued++;

        anim.always(function() {
            // doing this makes sure that the complete handler will be called
            // before this completes
            anim.always(function() {
                hooks.unqueued--;
                if (!jQuery.queue(elem, "fx").length) {
                    hooks.empty.fire();
                }
            });
        });
    }

    // height/width overflow pass
    if (elem.nodeType === 1 && ("height" in props || "width" in props)) {
        // Make sure that nothing sneaks out
        // Record all 3 overflow attributes because IE9-10 do not
        // change the overflow attribute when overflowX and
        // overflowY are set to the same value
        opts.overflow = [style.overflow, style.overflowX, style.overflowY];

        // Set display property to inline-block for height/width
        // animations on inline elements that are having width/height animated
        if (jQuery.css(elem, "display") === "inline" &&
            jQuery.css(elem, "float") === "none") {

            style.display = "inline-block";
        }
    }

    if (opts.overflow) {
        style.overflow = "hidden";
        anim.always(function() {
            style.overflow = opts.overflow[0];
            style.overflowX = opts.overflow[1];
            style.overflowY = opts.overflow[2];