xmlhttprequest

问题 Edit: Maybe I made the question more complex than it should. My questions is this: How do you make API calls to a server from JS. I have to create a very simple client that makes GET and POST calls to our server and parses the returned XML. I am writing this in JavaScript, problem is I don't know how to program in JS (started to look into this just this morning)! As n initial test, I am trying to ping to the Twitter API, here's the function that gets called when user enters the URL http://api

问题 I am developing a simple java ee application with front end in angular 4. with login(url = '/login'), i am setting user in http session like below : SessionUser user = userService.authenticateUser(email,password); request.getSession().setAttribute('SESSIONUSER', user); Also, I have written an Interceptor, which is intercepting each request (except login) and allow only if user is logged in i.e i am checking below : if(null != request.getsession().getAttribute("SESSIONUSER")) return true; else

问题 I am developing a simple java ee application with front end in angular 4. with login(url = '/login'), i am setting user in http session like below : SessionUser user = userService.authenticateUser(email,password); request.getSession().setAttribute('SESSIONUSER', user); Also, I have written an Interceptor, which is intercepting each request (except login) and allow only if user is logged in i.e i am checking below : if(null != request.getsession().getAttribute("SESSIONUSER")) return true; else

问题 I'm was making a drag and drop upload script by reading a bunch of tutorials, but they only cover the javascript part, and i'm having issues on the php part. I'm uploading a image as this: $('#drop-zone').bind('drop', drop); function drop(e) { e.stopPropagation(); e.preventDefault(); e.dataTransfer = e.originalEvent.dataTransfer; traverseFiles(e.dataTransfer.files); } traverseFiles makes a foreach loop for every file and calls upload funcion, there i do this: xhr = new XMLHttpRequest(); /

问题 I'm trying to fetch some content from another source using XHR as shown below: function fetchPage(str) { if(str=="") { document.getElementById("table").innerHTML=""; resetFilters(); $('#progress').hide(); //fetching progress bar <div> return; } if (window.XMLHttpRequest) // code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); else // code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); xmlhttp.onreadystatechange=postCallback; xmlhttp.open("GET", "fetch.php

问题 I am trying to submit a form via ajax using the post method and a FormData object. Here is a simplified version of the JavaScript: var form=…; // form element var url=…; // action form['update'].onclick=function(event) { // button name="update" var xhr=new XMLHttpRequest(); xhr.open('post',url,true); xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); var formData=new FormData(form); formData.append('update', true); // makes no difference xhr.send(formData); xhr.onload

问题 I'm using jQuery 1.4.2 and am trying to perform a simple AJAX request. The target URL returns a JSON string (I validated it with jslint). The request works in Firefox and Chrome, but doesn't want to work in IE8, and I can't determine why. Here is the call: jQuery.ajax({ url: 'http://' + domain + '/' + 'helper/echo/', dataType: 'json', success: function(data) { alert(data); }, beforeSend: function(request, settings) { alert('Beginning ' + settings.dataType + ' request: ' + settings.url); },

问题 How can I detect whether an Ajax request failed to load a file. Here is my code for reference : var pro = undefined; var xmlhttp; if (window.XMLHttpRequest){ xmlhttp = new XMLHttpRequest(); } else{ xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange = function(){ if (xmlhttp.readyState==4 && xmlhttp.status==200){ pro = JSON.parse(xmlhttp.responseText); } } xmlhttp.open("GET","data.json",true); xmlhttp.send(); Please, no jQuery. Thanks! 回答1: you can check if the http

问题 I'm not quite sure how to phrase this question correctly, so I'll start with the scenario I encountered. I have a bit of processing in my web app that takes longer than I'd like the user to wait to have control of the page again, so I decided to have it processed by an ajax request. The problem is, even though I offloaded this request into an ajax request, it seems that apache won't process any further requests until the original processor heavy request is complete. I originally wanted to

问题 How to reproduce the issue Make an AJAX request to a server using Safari Have the server response w/ 302 to a different domain If either of those conditions is not met, it works. Use a different browser, it works. Have the server redirect to same domain, it works. . Load: function (in_url, in_cb, in_responseType) { var xhr = new XMLHttpRequest(); xhr.open('GET', in_url, true); xhr.onload = function () { if (xhr.status === 200) { in_cb(null, xhr.response); } else { in_cb(new Error('[Loader]