var elementExists = $("#myElement").addClass("testClass").removeClass("testClass").hasClass("testClass"); if (elementExists) { console.log("元素存在"); } else { console.log("元素不存在"); } “` 以上是jQuery中判断元素是否存在的一些常用方法,在实际开发中,可以根据具体需求选择合适的方法...
2012 jQuery Foundation, Inc. and other contributors * Released under the MIT license * http://jquery.org/license * * Date: 2013-2-4 */ (function( window, undefined ) { // Can't do this because several apps including ASP.NET trace // the ...
Note that it isn't always necessary to test whether an element exists. The following code will show the element if it exists, and do nothing (with no errors) if it does not: 1 $("#myDiv").show(); How do I test whether an element has a particular class?
true if element exists in or out of the dom toHandle(eventName) e.g.expect($form).toHandle("submit") toHandleWith(eventName, eventHandler) e.g.expect($form).toHandleWith("submit", yourSubmitCallback) toHaveAttr(attributeName, attributeValue) ...
CreateDirectory(path); if (!System.IO.File.Exists(fullFileName)) { files[0].SaveAs(fullFileName); } string fileName = files[0].FileName.Substring(files[0].FileName.LastIndexOf("\\") + 1, files[0].FileName.Length - files[0].FileName.LastIndexOf("\\") - 1); string fileSize ...
$.ajaxFileUpload({url:"/Shared/Upload",//用于文件上传的服务器端请求地址type:"post",secureuri:false,//一般设置为falsefileElementId:"filePicture",//文件上传空间的id属性dataType:"json",//返回值类型 一般设置为jsonsuccess:function(data, status){//服务器成功响应处理函数alert(data.fileName); ...
Test Goodbye You can also select an element on the page and insert it into another: 1 $(".container").prepend( $("h2") ); Ifa single elementselected this way is inserted into a single location elsewhere in the DOM, it will be moved into the target (not cloned): 1 2 3 4 5...
Type:Function(Integerindex,Elementelement ) =>Boolean A function used as a test for every element in the set. It accepts two arguments,index, which is the element's index in the jQuery collection, andelement, which is the DOM element. Within the function,thisrefers to the current DOM eleme...
Check if the element already has a deferred attached for the given event if not, create it and make it so it is resolved when the event is fired the first time around then attach the given callback to the deferred and return the promise ...
Canvas elements will be copied to the printThis iframe and you can call printThis directly on a canvas element if you choose. doctypeString A doctype string to use on the printThis iframe. Defaults to the HTML5 doctype. removeScripts