Ajax等待界面美化和div永远屏幕居中显示

来源：互联网发布：广州本科网络教育编辑：程序博客网时间：2024/05/17 21:40

JQuery得Ajax提交数据时，为了加强界面效果，通常会添加一个等待画面。

CSS：

/* Ajax等待效果  */ .loading{      position: absolute;      /* top:50%;       left:50%;  */    width:220px;       height:56px;       line-height:56px;      color:#fff;      padding-left:60px;      font-size:15px;      background: #000 url(data:image/gif;base64,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) no-repeat 10px 50%;      opacity: 0.7;      z-index:9999; /*浮动在最上层 */    -moz-border-radius:20px;      -webkit-border-radius:20px;      border-radius:20px;      filter:progid:DXImageTransform.Microsoft.Alpha(opacity=70);  }

Ajax全局设置：

 <script type="text/javascript">            $(document).ready(function () {                $(document).ajaxStart(function () {                    //  var wait = '<div class="loading" id="waitting">正在努力加载数据...</div>';                    $('body').append('<div class="loading" id="waitting">正在努力加载数据...</div>');                    $('body').find('#waitting').css('top', $(document).scrollTop() + $(window).height() / 2 - 28 + 'px');                    $('body').find('#waitting').css('left', $(document).scrollLeft() + $(window).width() / 2 - 110 + 'px');                }).ajaxStop(function () {                    $('body').find('#waitting').remove();                });            });        </script>

这里动态添加一个div显示状态，并且通过js进行定位，时使其屏幕居中。

附：

ajax提交函数：

 function submitExamPaper(paper_count, paper_score, exam_time, exam_score) {            var token = $('#__token__').val();            var headerView = $('#headerTitle').html();            var contentView = $('.mainTopic').html();            // 过滤js            contentView = contentView.replace(/<script.*?>.*?<\/script>/ig, '');            //             var params = {'tal_count': paper_count, 'tal_score': paper_score, 'exam_time': exam_time, 'exam_score': exam_score,                'headerView': (headerView), 'contentView': (contentView), '__token__': token};            var url = '{:url("Exam/examPaper")}';            $.ajax({                type: "post",                url: url,                //async: true,                data: params,                success: function (data) {                    ajaxValue = data;                },                error: function (XMLHttpRequest) {                    ajaxValue = {'status': 0, 'msg': XMLHttpRequest.statusText};                }            });         }

  // code            submitExamPaper('{$exam.tal_count}', '{$exam.tal_score}', useTimes, tal_score);            var ajaxWait = window.setInterval(function () {                if (ajaxValue !== null) {                    window.clearInterval(ajaxWait);             if (ajaxValue.status === 1) {                $('#resultPanel').modal('show');            } else {                Ewin.error({message: ajaxValue.msg});            }                }            }, 500);

说明：

ajaxValue 为已全局变量

由于IE在ajax同步运行时会阻塞js执行，ajaxStart会失效，所以添加一个定时器来获取ajax返回值。

参见：

https://zhidao.baidu.com/question/123674913.html

https://zhidao.baidu.com/question/491929507.html

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