jquery的blockUI遮罩层的使用(1)，bootstrap前端开发

标签：jquery 遮罩 blockUI el msg var data opts

// plugin method for blocking element content

$.fn.block = function(opts) {

if ( this[0] === window ) {

$.blockUI( opts );

return this;

}

var fullOpts = $.extend({}, $.blockUI.defaults, opts || {});

this.each(function() {

var $el = $(this);

if (fullOpts.ignoreIfBlocked && $el.data(‘blockUI.isBlocked’))

return;

$el.unblock({ fadeOut: 0 });

});

return this.each(function() {

if ($.css(this,‘position’) == ‘static’) {

this.style.position = ‘relative’;

$(this).data(‘blockUI.static’, true);

}

this.style.zoom = 1; // force ‘hasLayout’ in ie

install(this, opts);

});

};

// plugin method for unblocking element content

$.fn.unblock = function(opts) {

if ( this[0] === window ) {

$.unblockUI( opts );

return this;

}

return this.each(function() {

remove(this, opts);

});

};

$.blockUI.version = 2.70; // 2nd generation blocking at no extra cost!

// override these in your code to change the default behavior and style

$.blockUI.defaults = {

// message displayed when blocking (use null for no message)

message: ‘

Please wait…

’,

title: null, // title string; only used when theme == true

draggable: true, // only used when theme == true (requires jquery-ui.js to be loaded)

theme: false, // set to true to use with jQuery UI themes

// styles for the message when blocking; if you wish to disable

// these and use an external stylesheet then do this in your code:

// $.blockUI.defaults.css = {};

css: {

padding: 0,

margin: 0,

width: ‘30%’,

top: ‘40%’,

left: ‘35%’,

textAlign: ‘center’,

color: ‘#000’,

border: ‘3px solid #aaa’,

backgroundColor:‘#fff’,

cursor: ‘wait’

// minimal style set used when themes are used

themedCSS: {

width: ‘30%’,

top: ‘40%’,

left: ‘35%’

// styles for the overlay

overlayCSS: {

backgroundColor: ‘#000’,

opacity: 0.6,

cursor: ‘wait’

// style to replace wait cursor before unblocking to correct issue

// of lingering wait cursor

cursorReset: ‘default’,

// styles applied when using $.growlUI

growlCSS: {

width: ‘350px’,

top: ‘10px’,

left: ‘’,

right: ‘10px’,

border: ‘none’,

padding: ‘5px’,

opacity: 0.6,

cursor: ‘default’,

color: ‘#fff’,

backgroundColor: ‘#000’,

‘-webkit-border-radius’:‘10px’,

‘-moz-border-radius’: ‘10px’,

‘border-radius’: ‘10px’

// IE issues: ‘about:blank’ fails on HTTPS and javascript:false is s-l-o-w

// (hat tip to Jorge H. N. de Vasconcelos)

/*jshint scripturl:true */

iframeSrc: /^https/i.test(window.location.href || ‘’) ? ‘javascript:false’ : ‘about:blank’,

// force usage of iframe in non-IE browsers (handy for blocking applets)

forceIframe: false,

// z-index for the blocking overlay

baseZ: 1000,

// set these to true to have the message automatically centered

centerX: true, // <-- only effects element blocking (page block controlled via css above)

centerY: true,

// allow body element to be stetched in ie6; this makes blocking look better

// on “short” pages. disable if you wish to prevent changes to the body height

allowBodyStretch: true,

// enable if you want key and mouse events to be disabled for content that is blocked

bindEvents: true,

// be default blockUI will supress tab navigation from leaving blocking content

// (if bindEvents is true)

constrainTabKey: true,

// fadeIn time in millis; set to 0 to disable fadeIn on block

fadeIn: 200,

// fadeOut time in millis; set to 0 to disable fadeOut on unblock

fadeOut: 400,

// time in millis to wait before auto-unblocking; set to 0 to disable auto-unblock

timeout: 0,

// disable if you don’t want to show the overlay

showOverlay: true,

// if true, focus will be placed in the first available input field when

// page blocking

focusInput: true,

// elements that can receive focus

focusableElements: ‘:input:enabled:visible’,

// suppresses the use of overlay styles on FF/Linux (due to performance issues with opacity)

// no longer needed in 2012

// applyPlatformOpacityRules: true,

// callback method invoked when fadeIn has completed and blocking message is visible

onBlock: null,

// callback method invoked when unblocking has completed; the callback is

// passed the element that has been unblocked (which is the window object for page

// blocks) and the options that were passed to the unblock call:

// onUnblock(element, options)

onUnblock: null,

// callback method invoked when the overlay area is clicked.

// setting this will turn the cursor to a pointer, otherwise cursor defined in overlayCss will be used.

onOverlayClick: null,

// don’t ask; if you really must know: http://groups.google.com/group/jquery-en/browse_thread/thread/36640a8730503595/2f6a79a77a78e493#2f6a79a77a78e493

quirksmodeOffsetHack: 4,

// class name of the message block

blockMsgClass: ‘blockMsg’,

// if it is already blocked, then ignore it (don’t unblock and reblock)

ignoreIfBlocked: false

};

// private data and functions follow…

var pageBlock = null;

var pageBlockEls = [];

function install(el, opts) {

var css, themedCSS;

var full = (el == window);

var msg = (opts && opts.message !== undefined ? opts.message : undefined);

opts = $.extend({}, $.blockUI.defaults, opts || {});

if (opts.ignoreIfBlocked && $(el).data(‘blockUI.isBlocked’))

return;

opts.overlayCSS = $.extend({}, $.blockUI.defaults.overlayCSS, opts.overlayCSS || {});

css = $.extend({}, $.blockUI.defaults.css, opts.css || {});

if (opts.onOverlayClick)

opts.overlayCSS.cursor = ‘pointer’;

themedCSS = $.extend({}, $.blockUI.defaults.themedCSS, opts.themedCSS || {});

msg = msg === undefined ? opts.message : msg;

// remove the current block (if there is one)

if (full && pageBlock)

remove(window, {fadeOut:0});

// if an existing element is being used as the blocking content then we capture

// its current place in the DOM (and current display style) so we can restore

// it when we unblock

if (msg && typeof msg != ‘string’ && (msg.parentNode || msg.jquery)) {

var node = msg.jquery ? msg[0] : msg;

var data = {};

$(el).data(‘blockUI.history’, data);

data.el = node;

data.parent = node.parentNode;

data.display = node.style.display;

data.position = node.style.position;

if (data.parent)

data.parent.removeChild(node);

}

$(el).data(‘blockUI.onUnblock’, opts.onUnblock);

var z = opts.baseZ;

// blockUI uses 3 layers for blocking, for simplicity they are all used on every platform;

// layer1 is the iframe layer which is used to supress bleed through of underlying content

// layer2 is the overlay layer which has opacity and a wait cursor (by default)

// layer3 is the message content that is displayed while blocking

var lyr1, lyr2, lyr3, s;

if (msie || opts.forceIframe)

lyr1 = $(‘’);

else

lyr1 = $(‘

’);

if (opts.theme)

lyr2 = $(‘

’);

else

lyr2 = $(‘

’);

if (opts.theme && full) {

s = ‘

’;

if ( opts.title ) {

s += ‘

’+(opts.title || ’ ‘)+’ ';

}

s += ‘

’;

s += ‘’;

}

else if (opts.theme) {

s = ‘

’;

if ( opts.title ) {

s += ‘

’+(opts.title || ’ ‘)+’ ';

}

s += ‘

’;

s += ‘’;

}

else if (full) {

s = ‘

’;

}

else {

s = ‘

’;

}

lyr3 = $(s);

// if we have a message, style it

if (msg) {

if (opts.theme) {

lyr3.css(themedCSS);

lyr3.addClass(‘ui-widget-content’);

}

else

lyr3.css(css);

}

// style the overlay

if (!opts.theme /&& (!opts.applyPlatformOpacityRules)/)

lyr2.css(opts.overlayCSS);

lyr2.css(‘position’, full ? ‘fixed’ : ‘absolute’);

// make iframe layer transparent in IE

if (msie || opts.forceIframe)

lyr1.css(‘opacity’,0.0);

//$([lyr1[0],lyr2[0],lyr3[0]]).appendTo(full ? ‘body’ : el);

var layers = [lyr1,lyr2,lyr3], $par = full ? $(‘body’) : $(el);

$.each(layers, function() {

this.appendTo($par);

});

if (opts.theme && opts.draggable && $.fn.draggable) {

lyr3.draggable({

handle: ‘.ui-dialog-titlebar’,

cancel: ‘li’

});

}

// ie7 must use absolute positioning in quirks mode and to account for activex issues (when scrolling)

var expr = setExpr && (!$.support.boxModel || $(‘object,embed’, full ? null : el).length > 0);

if (ie6 || expr) {

// give body 100% height

if (full && opts.allowBodyStretch && $.support.boxModel)

$(‘html,body’).css(‘height’,‘100%’);

// fix ie6 issue when blocked element has a border width

if ((ie6 || !$.support.boxModel) && !full) {

var t = sz(el,‘borderTopWidth’), l = sz(el,‘borderLeftWidth’);

var fixT = t ? ‘(0 - ‘+t+’)’ : 0;

var fixL = l ? ‘(0 - ‘+l+’)’ : 0;

}

// simulate fixed position

$.each(layers, function(i,o) {

var s = o[0].style;

s.position = ‘absolute’;

if (i < 2) {

if (full)

s.setExpression(‘height’,‘Math.max(document.body.scrollHeight, document.body.offsetHeight) - (jQuery.support.boxModel?0:’+opts.quirksmodeOffsetHack+‘) + “px”’);

else

s.setExpression(‘height’,‘this.parentNode.offsetHeight + “px”’);

if (full)

s.setExpression(‘width’,‘jQuery.support.boxModel && document.documentElement.clientWidth || document.body.clientWidth + “px”’);

else

s.setExpression(‘width’,‘this.parentNode.offsetWidth + “px”’);

if (fixL) s.setExpression(‘left’, fixL);

if (fixT) s.setExpression(‘top’, fixT);

}

else if (opts.centerY) {

if (full) s.setExpression(‘top’,‘(document.documentElement.clientHeight || document.body.clientHeight) / 2 - (this.offsetHeight / 2) + (blah = document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop) + “px”’);

s.marginTop = 0;

}

else if (!opts.centerY && full) {

var top = (opts.css && opts.css.top) ? parseInt(opts.css.top, 10) : 0;

var expression = ‘((document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop) + ‘+top+’) + “px”’;

s.setExpression(‘top’,expression);

}

});

}

// show the message

if (msg) {

if (opts.theme)

lyr3.find(‘.ui-widget-content’).append(msg);

else

lyr3.append(msg);

if (msg.jquery || msg.nodeType)

$(msg).show();

}

if ((msie || opts.forceIframe) && opts.showOverlay)

lyr1.show(); // opacity is zero

if (opts.fadeIn) {

var cb = opts.onBlock ? opts.onBlock : noOp;

var cb1 = (opts.showOverlay && !msg) ? cb : noOp;

var cb2 = msg ? cb : noOp;

if (opts.showOverlay)

lyr2._fadeIn(opts.fadeIn, cb1);

if (msg)

lyr3._fadeIn(opts.fadeIn, cb2);

}

else {

if (opts.showOverlay)

lyr2.show();

if (msg)

lyr3.show();

if (opts.onBlock)

opts.onBlock.bind(lyr3)();

}

// bind key and mouse events

bind(1, el, opts);

if (full) {

pageBlock = lyr3[0];

pageBlockEls = $(opts.focusableElements,pageBlock);

if (opts.focusInput)

setTimeout(focus, 20);

}

else

center(lyr3[0], opts.centerX, opts.centerY);

if (opts.timeout) {

// auto-unblock

var to = setTimeout(function() {

if (full)

$.unblockUI(opts);

else

$(el).unblock(opts);

}, opts.timeout);

$(el).data(‘blockUI.timeout’, to);

}

// remove the block

function remove(el, opts) {

var count;

var full = (el == window);

var $el = $(el);

var data = $el.data(‘blockUI.history’);

var to = $el.data(‘blockUI.timeout’);

if (to) {

clearTimeout(to);

$el.removeData(‘blockUI.timeout’);

}

opts = $.extend({}, $.blockUI.defaults, opts || {});

bind(0, el, opts); // unbind events

if (opts.onUnblock === null) {

opts.onUnblock = $el.data(‘blockUI.onUnblock’);

$el.removeData(‘blockUI.onUnblock’);

}

var els;

if (full) // crazy selector to handle odd field errors in ie6/7

els = $(‘body’).children().filter(‘.blockUI’).add(‘body > .blockUI’);

else

els = $el.find(‘>.blockUI’);

// fix cursor issue

if ( opts.cursorReset ) {

if ( els.length > 1 )

els[1].style.cursor = opts.cursorReset;

if ( els.length > 2 )

els[2].style.cursor = opts.cursorReset;

}

if (full)

pageBlock = pageBlockEls = null;

if (opts.fadeOut) {

count = els.length;

els.stop().fadeOut(opts.fadeOut, function() {

if ( --count === 0)

reset(els,data,opts,el);

});

}

else

reset(els, data, opts, el);

}

// move blocking element back into the DOM where it started

function reset(els,data,opts,el) {

var $el = $(el);

if ( $el.data(‘blockUI.isBlocked’) )

return;

els.each(function(i,o) {

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