Jquery 等待ajax返回数据loading控件ShowLoading组件

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1、意义

     开发项目中，前台的页面要发请求到服务器，服务器响应请求返回数据到前台，这段时间，有可能因为返回的数据量较大导致前台页面出现短暂性的等待，此时如果用户因不知情而乱点击有可能造成逻辑混乱，所以此时需要在加载数据中将前台进行提示在加载数据中，利用jquery的遮罩组件可以完成这个功能需求。

2、实现步骤

    （1）、下载 showLoading.css    jquery.showLoading.min.js  两个文件。

    （2）、在jsp中引入这两个文件

<link href="style/showLoading.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="js/jquery.showLoading.min.js"></script>

   （3）、在异步请求中使用这个组件

function showloading(url,data){
  $("body").showLoading();
  $.ajax({
    url:url,
    data:data,
    dataType:"json",
    success:function(obj){
      $("body").hideLoading();
    }
  });
}
－－－－－－－－－－showLoading.css 代码－－－－－－－－－－－－－－－－

a {
    color: blue;
    cursor:pointer;
    text-decoration: underline;
}

div.instructions_container {
    float: left;
    width: 350px;
    margin-right: 50px;

}

div#activity_pane {
    float:left;
    width: 350px;
    height: 200px;
    border: 1px solid #CCCCCC;
    font-weight:bold;">#EEEEEE;
    padding-top: 200px;
    text-align: center;

}

div.example_links
.link_category {
    margin-bottom: 15px;
}

.loading-indicator-bars {
    background-image: url(‘https://raw.githubusercontent.com/riverbed/flyscript-portal/master/thirdparty/showLoading/images/loading-bars.gif‘);
    width: 150px;
}

.loading-indicator {
    height: 80px;
    width: 80px;
    background: url( ‘https://raw.githubusercontent.com/riverbed/flyscript-portal/master/thirdparty/showLoading/images/loading.gif‘ );
    background-repeat: no-repeat;
    background-position: center center;
}

.loading-indicator-overlay {
    font-weight:bold;">#FFFFFF;
    opacity: 0.6;
    filter: alpha(opacity = 60);
}

－－－－－－－－－－－－－－－－－－－jquery.showLoading.js－－－－－－－－－－－－－－－－－－－－－－－－－－－－－

/*
 * jQuery showLoading plugin v1.0
 *
 * Copyright (c) 2009 Jim Keller
 * Context - http://www.contextllc.com
 *
 * Dual licensed under the MIT and GPL licenses.
 *
 * Modified by <cwhite@riverbed.com> to support displaying
 * percentage complete.
 */

jQuery.fn.setLoading = function(pct) {
    var indicatorID = jQuery(this).attr(‘id‘);

    $(‘#loading-indicator-‘ + indicatorID).html(pct + ‘%‘);
};

jQuery.fn.showLoading = function(options) {

    var indicatorID;
    var settings = {
        ‘addClass‘: ‘‘,
        ‘beforeShow‘: ‘‘,
        ‘afterShow‘: ‘‘,
        ‘hPos‘: ‘center‘,
        ‘vPos‘: ‘center‘,
        ‘indicatorZIndex‘ : 5001,
        ‘overlayZIndex‘: 5000,
        ‘parent‘: ‘‘,
        ‘marginTop‘: 0,
        ‘marginLeft‘: 0,
        ‘overlayWidth‘: null,
        ‘overlayHeight‘: null
    };

    jQuery.extend(settings, options);

    var loadingDiv = jQuery(‘<div style="text-align:center"></div>‘);
    var overlayDiv = jQuery(‘<div></div>‘);

    //
    // Set up ID and classes
    //
    if ( settings.indicatorID ) {
        indicatorID = settings.indicatorID;
    }
    else {
        indicatorID = jQuery(this).attr(‘id‘);
    }

    //jQuery(this).resize(function(e) {
    //    alert("Change event");
    //});

    jQuery(loadingDiv).attr(‘id‘, ‘loading-indicator-‘ + indicatorID );
    jQuery(loadingDiv).addClass(‘loading-indicator‘);

    if ( settings.addClass ){
        jQuery(loadingDiv).addClass(settings.addClass);
    }

    //
    // Create the overlay
    //
    jQuery(overlayDiv).css(‘display‘, ‘none‘);

    // Append to body, otherwise position() doesn‘t work on Webkit-based browsers
    jQuery(document.body).append(overlayDiv);

    //
    // Set overlay classes
    //
    jQuery(overlayDiv).attr(‘id‘, ‘loading-indicator-‘ + indicatorID + ‘-overlay‘);

    jQuery(overlayDiv).addClass(‘loading-indicator-overlay‘);

    if ( settings.addClass ){
        jQuery(overlayDiv).addClass(settings.addClass + ‘-overlay‘);
    }

    //
    // Set overlay position
    //

    var overlay_width;
    var overlay_height;

    var border_top_width = jQuery(this).css(‘border-top-width‘);
    var border_left_width = jQuery(this).css(‘border-left-width‘);

    //
    // IE will return values like ‘medium‘ as the default border,
    // but we need a number
    //
    border_top_width = isNaN(parseInt(border_top_width)) ? 0 : border_top_width;
    border_left_width = isNaN(parseInt(border_left_width)) ? 0 : border_left_width;

    var overlay_left_pos = jQuery(this).offset().left + parseInt(border_left_width);// +  $(document.body).css( "border-left" );
    var overlay_top_pos = jQuery(this).offset().top + parseInt(border_top_width);

    if ( settings.overlayWidth !== null ) {
        overlay_width = settings.overlayWidth;
    }
    else {
        overlay_width = parseInt(jQuery(this).width()) + parseInt(jQuery(this).css(‘padding-right‘)) + parseInt(jQuery(this).css(‘padding-left‘));
    }

    if ( settings.overlayHeight !== null ) {
        overlay_height = settings.overlayWidth;
    }
    else {
        overlay_height = parseInt(jQuery(this).height()) + parseInt(jQuery(this).css(‘padding-top‘)) + parseInt(jQuery(this).css(‘padding-bottom‘));
    }


    jQuery(overlayDiv).css(‘width‘, overlay_width.toString() + ‘px‘);
    jQuery(overlayDiv).css(‘height‘, overlay_height.toString() + ‘px‘);

    jQuery(overlayDiv).css(‘left‘, overlay_left_pos.toString() + ‘px‘);
    jQuery(overlayDiv).css(‘position‘, ‘absolute‘);

    jQuery(overlayDiv).css(‘top‘, overlay_top_pos.toString() + ‘px‘ );
    jQuery(overlayDiv).css(‘z-index‘, settings.overlayZIndex);

    //
    // Set any custom overlay CSS
    //
    if ( settings.overlayCSS ) {
        jQuery(overlayDiv).css ( settings.overlayCSS );
    }


    //
    // We have to append the element to the body first
    // or .width() won‘t work in Webkit-based browsers (e.g. Chrome, Safari)
    //
    jQuery(loadingDiv).css(‘display‘, ‘none‘);
    jQuery(document.body).append(loadingDiv);

    jQuery(loadingDiv).css(‘position‘, ‘absolute‘);
    jQuery(loadingDiv).css(‘z-index‘, settings.indicatorZIndex);

    //
    // Set top margin
    //

    var indicatorTop = overlay_top_pos;

    if ( settings.marginTop ) {
        indicatorTop += parseInt(settings.marginTop);
    }

    var indicatorLeft = overlay_left_pos;

    if ( settings.marginLeft ) {
        indicatorLeft += parseInt(settings.marginTop);
    }


    //
    // set horizontal position
    //
    if ( settings.hPos.toString().toLowerCase() == ‘center‘ ) {
        jQuery(loadingDiv).css(‘left‘, (indicatorLeft + ((jQuery(overlayDiv).width() - parseInt(jQuery(loadingDiv).width())) / 2)).toString()  + ‘px‘);
    }
    else if ( settings.hPos.toString().toLowerCase() == ‘left‘ ) {
        jQuery(loadingDiv).css(‘left‘, (indicatorLeft + parseInt(jQuery(overlayDiv).css(‘margin-left‘))).toString() + ‘px‘);
    }
    else if ( settings.hPos.toString().toLowerCase() == ‘right‘ ) {
        jQuery(loadingDiv).css(‘left‘, (indicatorLeft + (jQuery(overlayDiv).width() - parseInt(jQuery(loadingDiv).width()))).toString()  + ‘px‘);
    }
    else {
        jQuery(loadingDiv).css(‘left‘, (indicatorLeft + parseInt(settings.hPos)).toString() + ‘px‘);
    }

    //
    // set vertical position
    //
    if ( settings.vPos.toString().toLowerCase() == ‘center‘ ) {
        jQuery(loadingDiv).css(‘top‘, (indicatorTop + ((jQuery(overlayDiv).height() - parseInt(jQuery(loadingDiv).height())) / 2)).toString()  + ‘px‘);
    }
    else if ( settings.vPos.toString().toLowerCase() == ‘top‘ ) {
        jQuery(loadingDiv).css(‘top‘, indicatorTop.toString() + ‘px‘);
    }
    else if ( settings.vPos.toString().toLowerCase() == ‘bottom‘ ) {
        jQuery(loadingDiv).css(‘top‘, (indicatorTop + (jQuery(overlayDiv).height() - parseInt(jQuery(loadingDiv).height()))).toString()  + ‘px‘);
    }
    else {
        jQuery(loadingDiv).css(‘top‘, (indicatorTop + parseInt(settings.vPos)).toString() + ‘px‘ );
    }




    //
    // Set any custom css for loading indicator
    //
    if ( settings.css ) {
        jQuery(loadingDiv).css ( settings.css );
    }


    //
    // Set up callback options
    //
    var callback_options =
    {
        ‘overlay‘: overlayDiv,
        ‘indicator‘: loadingDiv,
        ‘element‘: this
    };

    //
    // beforeShow callback
    //
    if ( typeof(settings.beforeShow) == ‘function‘ ) {
        settings.beforeShow( callback_options );
    }

    //
    // Show the overlay
    //
    jQuery(overlayDiv).show();

    //
    // Show the loading indicator
    //
    jQuery(loadingDiv).show();

    //
    // afterShow callback
    //
    if ( typeof(settings.afterShow) == ‘function‘ ) {
        settings.afterShow( callback_options );
    }

    return this;
};


jQuery.fn.hideLoading = function(options) {


    var settings = {};

    jQuery.extend(settings, options);

    if ( settings.indicatorID ) {
        indicatorID = settings.indicatorID;
    }
    else {
        indicatorID = jQuery(this).attr(‘id‘);
    }

    jQuery(document.body).find(‘#loading-indicator-‘ + indicatorID ).remove();
    jQuery(document.body).find(‘#loading-indicator-‘ + indicatorID + ‘-overlay‘ ).remove();

    return this;
};



jQuery(document).ready(
    function() {

        //
        // When a user clicks the ‘loading-default‘ link,
        // call showLoading on the activity pane
        // with default options
        //
        jQuery(‘a.loading-default‘).click(

            function() {
                jQuery(‘#activity_pane‘).showLoading();
            }

        );


        //
        // When a user clicks the ‘loading-ajax‘ link,
        // call showLoading, sleep, then call hide loading
        // with default options
        //
        jQuery(‘a.loading-ajax‘).click(



            function() {


                jQuery(‘#activity_pane‘).showLoading(
                    {
                        ‘afterShow‘:
                            function() {
                                setTimeout( "jQuery(‘#activity_pane‘).hideLoading()", 1000 );
                            }



                    }
                );
            }

        );


        //
        // When a user clicks the ‘loading-bars‘ link,
        // call showLoading with addClass specified
        //
        jQuery(‘a.loading-bars‘).click(

            function() {
                jQuery(‘#activity_pane‘).showLoading(
                    {
                        ‘addClass‘: ‘loading-indicator-bars‘

                    }
                );
            }

        );


        //
        // When a user clicks the ‘loading-hide‘ link,
        // call hideLoading on the activity pane
        //
        jQuery(‘a.loading-hide‘).click(

            function() {
                jQuery(‘#activity_pane‘).hideLoading();
            }

        );

    }

);

Jquery 等待ajax返回数据loading控件ShowLoading组件

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原文地址：http://www.cnblogs.com/shiyou00/p/5528414.html