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jquery.busy.js
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jquery.busy.js
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/*
* jQuery-busy v1.0.6
* Copyright 2010-2012 Tomasz Szymczyszyn
*
* This plug-in is dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*/
(function($) {
// Helper object factory
function Busy(options) {
this.options = $.extend({}, Busy.defaults, options);
};
// Remembers currently "busied" targets along with options
Busy.instances = [];
Busy.repositionAll = function() {
for (var i = 0; i < Busy.instances.length; i++) {
if (! Busy.instances[i])
continue;
var options = Busy.instances[i].options;
new Busy(options).positionImg($(Busy.instances[i].target), $.data(Busy.instances[i].target, "busy"), options.position);
}
};
Busy.prototype.hide = function(targets) {
targets.each(function() {
var busyImg = $.data(this, "busy");
if (busyImg)
busyImg.remove();
$(this).css("visibility", "");
$.data(this, "busy", null);
for (var i = 0; i < Busy.instances.length; i++)
if (Busy.instances[i] != null && Busy.instances[i].target == this)
Busy.instances[i] = null;
});
};
Busy.prototype.show = function(targets) {
var that = this;
targets.each(function() {
if ($.data(this, "busy"))
return;
var target = $(this);
var busyImg = that.buildImg();
busyImg.css("visibility", "hidden");
busyImg.load(function() {
that.positionImg(target, busyImg, that.options.position);
busyImg.css("visibility", "");
busyImg.css("zIndex", that.options.zIndex);
});
that.positionImg(target, busyImg, that.options.position);
$("body").append(busyImg);
if (that.options.hide)
target.css("visibility", "hidden");
$.data(this, "busy", busyImg);
Busy.instances.push({ target : this, options : that.options });
});
};
Busy.prototype.preload = function() {
var busyImg = this.buildImg();
busyImg.css("visibility", "hidden");
busyImg.load(function() {
$(this).remove();
});
$("body").append(busyImg);
};
// Creates image node, wraps it in $ object and returns.
Busy.prototype.buildImg = function() {
var html = "<img src='" + this.options.img + "' alt='" + this.options.alt + "' title='" + this.options.title + "'";
if (this.options.width)
html += " width='" + this.options.width + "'";
if (this.options.height)
html += " height='" + this.options.height + "'";
html += " />";
return $(html);
};
Busy.prototype.positionImg = function(target, busyImg, position) {
var targetPosition = target.offset();
var targetWidth = target.outerWidth();
var targetHeight = target.outerHeight();
var busyWidth = busyImg.outerWidth();
var busyHeight = busyImg.outerHeight();
if (position == "left") {
var busyLeft = targetPosition.left - busyWidth - this.options.offset;
}
else if (position == "inner-left") {
var busyLeft = targetPosition.left;
}
else if (position == "right") {
var busyLeft = targetPosition.left + targetWidth + this.options.offset;
}
else if (position == "inner-right") {
var busyLeft = targetPosition.left + targetWidth - busyWidth - this.options.offset;
}
else {
var busyLeft = targetPosition.left + (targetWidth - busyWidth) / 2.0;
}
var busyTop = targetPosition.top + (targetHeight - busyHeight) / 2.0;
busyImg.css("position", "absolute");
busyImg.css("left", busyLeft + "px");
busyImg.css("top", busyTop + "px");
};
Busy.defaults = {
img : 'busy.gif',
alt : 'Please wait...',
title : 'Please wait...',
hide : true,
position : 'center',
zIndex : 1001,
width : null,
height : null,
offset : 10
};
$.fn.busy = function(options, defaults) {
if ($.inArray(options, ["clear", "hide", "remove"]) != -1) {
// Hide busy image(s)
new Busy(options).hide($(this));
}
else if (options == "defaults") {
// Overwrite defaults
$.extend(Busy.defaults, defaults || {});
}
else if (options == "preload") {
// Preload busy image
new Busy(options).preload();
}
else if (options == "reposition") {
// Update positions of all existing busy images
Busy.repositionAll();
}
else {
// Show busy image(s)
new Busy(options).show($(this));
}
return $(this);
};
})(jQuery);