xmlhttprequest

Empty responseText from XMLHttpRequest

由 ε祈祈猫儿з 提交于 2019-12-27 11:43:29
问题 I have written an XMLHttpRequest which runs fine but returns an empty responseText. The javascript is as follows: var anUrl = "http://api.xxx.com/rates/csv/rates.txt"; var myRequest = new XMLHttpRequest(); callAjax(anUrl); function callAjax(url) { myRequest.open("GET", url, true); myRequest.onreadystatechange = responseAjax; myRequest.setRequestHeader("Cache-Control", "no-cache"); myRequest.send(null); } function responseAjax() { if(myRequest.readyState == 4) { if(myRequest.status == 200) {

How to create Document objects with JavaScript

由 走远了吗. 提交于 2019-12-27 11:14:47
问题 Basically that's the question, how is one supposed to construct a Document object from a string of HTML dynamically in javascript? 回答1: There are two methods defined in specifications, createDocument from DOM Core Level 2 and createHTMLDocument from HTML5. The former creates an XML document (including XHTML), the latter creates a HTML document. Both reside, as functions, on the DOMImplementation interface. var impl = document.implementation, xmlDoc = impl.createDocument(namespaceURI,

ajax核心代码

由 微笑、不失礼 提交于 2019-12-26 18:59:44
ajax核心代码：XMLHttpRequest //定义IE所有支持的XMLHttpRequest对象版本字符串 var allVersion = ["Msxml.xmlhttp.5.0","Msxml.xmlhttp.4.0","Msxml.xmlhttp.3.0","Msxml.xmlhttp","Microsoft.xmlhttp"]; if(window.XMLHttpRequest){ var xht =new XMLHttpRequest(); } else{ for(var i=0;i<allVersion.length;i++){ try{ var xht = new ActiveXObject(allVersion[i]);} catch(e){ continue; } break; } try{ xht.open('get','server.html','true'); xht.onreadystatechange = function(){ if(xht.readyState ==4&&xht.status==200){ alert(xht.responseText);} } xht.send(null); catch(e1){ //在IE下必须运行在服务器环境中，否则将得到拒绝访问的异常信息 alert(e1.message); } } 来源： https:

前端之Ajax

由 独自空忆成欢 提交于 2019-12-26 10:15:52
主要内容: 1. XMLHttpRequest 对象 2. GET 和 POST 3. 封装 Ajax 概念: Ajax 技术核心是 XMLHttpRequest 对象(简称 XHR)，这是由微软首先引入的一个特性，其 他浏览器提供商后来都提供了相同的实现。在 XHR 出现之前，Ajax 式的通信必须借助一些手段 来实现，大多数是使用隐藏的框架或内嵌框架。 XHR 的出现，提供了向服务器发送请求和解析服务器响应提供了流畅的接口。能够以异步 方式从服务器获取更多的信息，这就意味着，用户只要触发某一事件，在不刷新网页的情况下， 更新服务器最新的数据。 XMLHttpRequest 对象 IE7+、Firefox、Opera、Chrome 都支持原生的 XHR 对象，在这些浏览器中创建 XHR 对 象可以直接实例化 XMLHttpRequest 即可。 var xhr = new XMLHttpRequest(); alert(xhr); //XMLHttpRequest 了解：较老的 IE 版本创建 Microsoft.XMLHTTP 对象: var xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); 在使用 XHR 对象时，先必须调用 open()方法，它接受三个参数：要发送的 请求类型(get、 post) 、 请求的 UR L 和

How to link XMLHTTP Request to right Response in case of multiple AJAX request in a loop

由 霸气de小男生 提交于 2019-12-25 18:05:12
问题 I am trying to send multiple AJAX request inside a for loop. I need to make sure that responses are getting linked to the right request that are being made. I am following the solution that is posted here XMLHttpRequest in for loop Here, fileBatches is the size of the loop. I am trying to capture the response which says the information about the number of requests succeeded and failed and trying to store it in _finalResponseArray. If the length of the fileBatches is 3, there are chances that

How to link XMLHTTP Request to right Response in case of multiple AJAX request in a loop

由 淺唱寂寞╮ 提交于 2019-12-25 18:04:47
问题 I am trying to send multiple AJAX request inside a for loop. I need to make sure that responses are getting linked to the right request that are being made. I am following the solution that is posted here XMLHttpRequest in for loop Here, fileBatches is the size of the loop. I am trying to capture the response which says the information about the number of requests succeeded and failed and trying to store it in _finalResponseArray. If the length of the fileBatches is 3, there are chances that

No 'Access-Control-Allow-Origin' header is present on the requested resource - Ionic 2 [duplicate]

由 时光总嘲笑我的痴心妄想 提交于 2019-12-25 17:43:43
问题 This question already has answers here : Origin is not allowed by Access-Control-Allow-Origin (18 answers) Closed 3 years ago . I have a rest web service and now I want to make a post request from ionic 2 frontend app to authentication rest method. On my login component I have: ...this._restClient.post( 'authentication', body, (data) => this.handleSuccessAuthenticate(data), (data) => this.handleErrorAuthenticate(data) );... On my provider my _restClient code is: public post(resource: string,

Will $.getJSON work with PhoneGap build?

由 若如初见. 提交于 2019-12-25 17:13:10
问题 Is anyone able to get this to work in their PhoneGap build? : $(function(){ $.getJSON("http://reddit.com/.json", function(data){ alert("Success!"); }) }) It works fine in browsers but when I build the app it doesn't run. I've added these to my config.xml already to whitelist all domains <allow-navigation href="http://*/*" /> <allow-navigation href="https://*/*" /> <allow-navigation href="data:*" /> <allow-navigation href="*" /> <access origin="*" /> <allow-intent href="*" /> Also tried

Javascript: Read raw bytes from XMLHttpRequest - messed up

由 萝らか妹 提交于 2019-12-25 12:46:10
问题 I'm playing with the code snippet from this original question: Read bytes from a binary file with JavaScript, without jQuery However, for some reasons, a whole different set of bytes appear to be loaded! I suspect this has to do with the string conversion. Here's a copy of the binary file I am trying to download: http://steeman.dk/html5/coco/colorbasic13.rom To my local IIS 7.5 server I have added the .rom MIME type as 'application/octet-stream' (I have also tried with 'text/plain; charset=x

XMLHttpRequest

由 橙三吉。 提交于 2019-12-25 11:20:34
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 主要内容 ： 这里是列表文本这里是列表文本使用XMLHttpRequest 对象 使用XMLHttpRequest 事件 跨域ajax 通信的限制 **ajax ** 全名：asynchronous javascript + xml 的简写 改变了web诞生依赖单击等待的模式。 ajax的技术核心：XMLHttpRequest 对象（简称 XHR)。 这是微软引进的一个特性,在这之前ajax的 通信必须借助一些hack 手段进行。 XHR 为向服务器发送请求和接收服务器的响应提供了一系列的接口。能够以异步的方式从服务器获取更多信息。也就是说可以使用XHR 获取新数据，然后通过DOM将数据插入到页面中。 此外，虽然名字中包含XHR，但 ajax通信与数据格式无关，获得的数据不一定就是xml数据。 历史 ： IE5 是第一款引入XHR的浏览器 。在IE5中 XHR对象是通过MSXML库中的一个ActiveX对象实现的。 在IE5中 可能遇到三种不同版本的XHR 对象。即 MSXML2.XMLHttp、 MSXML2.XMLHttp.3.0、 MSXML2.XMLHttp.6.0。 IE7之前的 版本 要使用MSXML库中的XHR 对象，需要编写一个函数： 这个函数会根据可用的MSXML库创建最新版本的XHR对象。
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