JS实现的自定义显示加载等待图片插件(loading.gif)
hbiao68 人气:2本文实例讲述了JS实现的自定义显示加载等待图片插件。分享给大家供大家参考,具体如下:
在工作中遇到了一个问题 —— 某个业务流程分为几个阶段,每个阶段如果在数据没有显示出来之前就要显示加载图片loading.gif文件,如果有数据了就消失。为此,自己写了一个方法,方便整个工程使用。
<button onclick="show()">show</button> <button onclick="hide()">hide</button> <script> //创建加载对象 var obj = new loadingImg(); //显示加载图片 function show(){ obj.show(); } //隐藏加载图片 function hide(){ obj.hide(); } //加载图片方法(对象) function loadingImg(mySetting){ var that = this; if(mySetting == "" || mySetting == undefined || typeof mySetting != "object"){ mySetting = {}; } //使用时间戳作为空间的ID var targetID = new Date().getTime(); this.setting = { //插入图片的容器,使用jquery的查询方式传入参数 targetConater : "", //使用图片的地址 imgUrl : "../img/loading.gif", //图片显示的 宽度 imgWidth : "32px", //图片的默认样式 imgClass : "", //生成控件的ID "targetID" : targetID, //显示之前的回调函数 beforeShow : function(plugin){ }, //显示之后的回调函数 afterShow : function(plugin,targetID){ } } this.setting = $.extend(this.setting, mySetting); //获取屏幕的宽度 this.getScreenWidth = function(){ return document.documentElement.clientWidth; } //获取屏幕的高度 this.getScreenHeight = function (){ return document.documentElement.clientHeight; } //显示控件 this.show = function(){ $("#" + that.setting.targetID).show(); } //隐藏控件 this.hide = function(){ $("#" + that.setting.targetID).hide(); } this.init = function(){ //显示之前执行回调函数 if(typeof that.setting.beforeShow == "function"){ that.setting.beforeShow(that); } //存放字符串的变量 var targetHTML = ''; //将内容存放到指定的容器中,默认存放到body最底部 if(that.setting.targetConater != "" && this.setting.targetConater != undefined){ targetHTML = '<img src="' + that.setting.imgUrl + '" class="' + that.setting.imgClass + '" id="' + that.setting.targetID + '" style="display:none;">'; $(that.setting.targetConater).html(targetHTML); }else{ targetHTML = '<img src="' + that.setting.imgUrl + '" class="' + that.setting.imgClass + '">'; targetHTML = '<div id="' + that.setting.targetID + '" style="display:none;position: absolute;top:50%;left: 50%;height: ' + that.getScreenHeight()+';width:'+that.getScreenWidth()+'">' + targetHTML + '</div>'; $("body").append(targetHTML); } //判断用户是否自定义了图片的宽度 if(that.setting.imgWidth != "" && that.setting.imgWidth.indexOf("px")>0 ){ $("#"+targetID).css("width",that.setting.imgWidth); } //显示之后执行回调函数 if(typeof that.setting.afterShow == "function"){ that.setting.afterShow(that,targetID); } } this.init(); } </script>
希望本文所述对大家JavaScript程序设计有所帮助。
加载全部内容