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In jQuery:
$.get( "someurl", function( data ) {
alert( data );
});
How to turn this into pure JavaScript?
Use XMLHttpRequest,
var xhr = new XMLHttpRequest();
xhr.open("GET", "http://www.example.org/example.txt");
xhr.onreadystatechange = function() {
if (xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
// handle xhr.response
}
}
xhr.send();
Related
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ok I want a help with a code, when user click the "download", it should go to the first link but if link 1 is down, it should go to 2nd link ........link 1 should be a default, it should only send the visitor to 2nd link if 1st link dead or down
please tell me if this kind of thing is possible, or just my imagination
and it will be great if the 2nd link is hidden which can't found out by simple inspect tool,if not possible just forget the last line
You can make a call and check the return status with AJAX. Then based on the status code such as 200,404, you can decide what you want to do. This can be done easier with jQuery.ajax() method if you use jQuery.
One of the approach would be to check the URL and recieve the status with AJAX. Based on the returned status code (example 404), you decide what to do next:
with jQuery
$.ajax({
type: 'HEAD',
url: 'http://yoursite.com/pagename.php',
success: function() {
// NO 404 ERROR
},
error: function() {
// error in HEAD (404)
}
});
with Pure Javascript:
function checkUrl(url) {
var request = false;
if (window.XMLHttpRequest) {
request = new XMLHttpRequest;
} else if (window.ActiveXObject) {
request = new ActiveXObject("Microsoft.XMLHttp");
}
if (request) {
request.open("GET", url);
if (request.status == 200) { return true; }
}
return false;
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I need help to change pure javascript code into jquery code
document.getElementById('type').onchange = function (){
if(this.value == "Student"){
$("#cls").prop({disabled: false});
$("#sec").prop({disabled: false});
$('.cls').show();
$('.sec').show();
}
else{
$("#cls").prop({disabled: true});
$("#sec").prop({disabled: true});
$('.cls').hide();
$('.sec').hide();
}
}
That is mostly jQuery. Having said that you can reduce it a bit.
$('#type').on('change', function (){
if (this.value == "Student"){
$("#cls, #sec").prop({disabled: false});
$('.cls, .sec').show();
} else{
$("#cls, #sec").prop({disabled: true});
$('.cls, .sec').hide();
}
});
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The following code is my frontend code for a http long poll. In this I am expecting the code setTimeout(getChat, 0) to call the method asynchronously. But when the getChat method's XHR is pending all following XHRs of different methods are also getting into pending state.
discussTask = function(taskId) {
taskIdChat = taskId
getChat() // initial call
}
var getChat = function() {
taskId = taskIdChat
payLoad = {
'task_id': taskIdChat,
'recent_message_id': recentMessageId
}
var xmlhttp = XHR('/chat/sync', 'POST', payLoad)
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState === 4) {
buildChat(JSON.parse(xmlhttp.responseText))
setTimeout(getChat, 0) // Async recursive call
}
}
}
var XHR = function(action, method, payLoad) {
var xmlhttp = new XMLHttpRequest()
xmlhttp.open(method, action, true)
xmlhttp.setRequestHeader('Content-Type', 'application/json;charset=UTF-8')
xmlhttp.send(JSON.stringify(payLoad))
return xmlhttp
}
Found the issue. The Problem was not client side. I am using flask framework which by default will run in single threaded mode. So it was not serving the async requests from client side.
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I'm looking to get data from the http://dev.markitondemand.com/ API. The API was designed to be used with AJAX calls, but for technical reasons I cannot include JQuery in my project. How do I get the info that this page provides without making an AJAX call to the server? JSON and XML are both fine.
An ajax call is simply an XMLHttpRequest that can be used to fetch data in various formats (like JSON and XML) from a server. Jquery has some functions which simplify the process of making ajax calls, but it is not needed.
You can just use the built-in XMLHttpRequest API to make the request using vanilla javascript.
Example
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
alert(xhr.responseText);
}
}
xhr.open('GET', 'http://dev.markitondemand.com/Api/v2/Lookup', true);
xhr.send(null);
AJAX is a way to fetch data from a server. Using jQuery is not the only way to perform AJAX. You can do it AJAX requests with VanillaJS (pure JavaScript). To do this :
if(window.XMLHttpRequest){
var xhr = new XMLHttpRequest();
} else {
var xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
alert(xhr.responseText);
}
}
xhr.open('GET', 'http://dev.markitondemand.com/Api/v2/Lookup', true);
xhr.send(null);
See this MDN link for a better understanding of AJAX.
See this W3schools.com tutorial to know how to handle Internet Explorer.
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None of the jQuery methods, from the jQuery page could work in the same way, as this simply does.
function enableAjaxTask(removeLink){
var xmlhttp = false;
if(window.XMLHttpRequest){
xmlhttp = new XMLHttpRequest();
}else{
xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
}
xmlhttp.onreadystatechange = function(){
if(xmlhttp.readyState === 4 && xmlhttp.status === 200){
document.getElementById('foo').innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open('GET', 'foo.php?id=22', true);
xmlhttp.send(null);
}
it should be like this
$.ajax({
type: 'GET', //GET/POST
url: 'foo.php',//URL to send request
data: 'id=12', //query parameters here, you can direct pass url: 'foo.php?id=12'
success: function(responseText){
//called if the request succeeds. also check complete ,done, error
$('#foo').html(responseText);
}
});
$("#foo").load('foo.php?id=22');
http://api.jquery.com/load/