Why doesn't jquery work within ajax method?
<body>
<h2>The XMLHttpRequest Object</h2>
<p id="demo">Let AJAX change this text.</p>
<button type="button" onclick="loadDoc()">Change Content</button>
<script>
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
$('#demo').html('Hello World');
}
};
xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();
}
</script>
</body>
now here
$('#demo').html('Hello World');
it's not working.
but this does
document.getElementById("demo").innerHTML = 'asas';
why ? What could bt the reason. I have tried to change id to class but no luck.
Try adding in jQuery
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
Right before the </body> tag.
As #31piy mentions in his comment, you can use jQuery's ajax functions like this:
<script>
$(function() {
$(document).on('click', 'button', function (event) {
event.preventDefault();
$.get('ajax_info.txt', '', function(response, textStatus) {
$('#demo').html('Hello World');
});
});
});
</script>
Related
I have this code
<html>
<head>
<script>
function main(){
function loadWordlist(url){
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
console.log('firstFunction');
}
};
xhttp.open("GET", url, true);
xhttp.send();
}
loadWordlist('https://www.example.com/');
}
main()
</script>
</head>
<body>
<script>
console.log('secondFunction')
</script>
</body>
<html>
Here i am getting the content from the url
And during that the browser contain loading the code and execute it
But i get secondFunction first then firstFunction
And i want firstFunction to execute first then secondFunction after firstFunction finish
Call the second function from the first function.
<html>
<head>
<script>
function main(){
function loadWordlist(url){
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
console.log('firstFunction');
secondFunction();
}
};
xhttp.open("GET", url, true);
xhttp.send();
}
loadWordlist('https://www.example.com/');
}
main()
</script>
</head>
<body>
<script>
function secondFunction() {
console.log('secondFunction');
}
</script>
</body>
<html>
If that's not possible, you can make xhttp.send() blocking. I strongly advise against it. It's bad user experience. But it's possible, and maybe there are use-cases where this is the only solution.
<html>
<head>
<script>
function main(){
function loadWordlist(url){
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
console.log('firstFunction');
}
};
xhttp.open("GET", url, false);
xhttp.send();
}
loadWordlist('https://www.example.com/');
}
main()
</script>
</head>
<body>
<script>
console.log('secondFunction')
</script>
</body>
<html>
I want when I click the button a GET Request to send but I don't know how to connect the AJAX script with the button.
<script>
var url = "http://myurl.com";
var xhr = new XMLHttpRequest();
xhr.open("GET", url);
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
console.log(xhr.status);
console.log(xhr.responseText);
}};
xhr.send();
</script>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<button>Make a request</button>
you need transform it in a function and call by the button:
<script>
function call()
{
var url = "http://myurl.com";
var xhr = new XMLHttpRequest();
xhr.open("GET", url);
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
console.log(xhr.status);
console.log(xhr.responseText);
}};
xhr.send();
}
</script>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<button onclick="call();">Make a request</button>
Seeing as you are importing Jquery, there is also a helper function to fetch data from an AJAX request, you can use it like this:
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<button>Make a request</button>
<!-- Javascript -->
<script>
$('button').click(function(){
$.get("http://myurl.com", function(result) {
console.log(result);
});
});
</script>
I have been working with script from w3schools. I would like the ajax_info.txt file to appear as the page loads instead of with the button click. I've seen this question before, but can't find the answer again after a couple of days of looking. I pre-apologize for this idiotic question.
<!DOCTYPE html>
<html>
<body>
<h1>The XMLHttpRequest Object</h1>
<p id="demo">Let AJAX change this text.</p>
<button type="button" onclick="loadDoc()">Change Content</button>
<script>
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("demo").innerHTML = this.responseText;
}
};
xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();
}
</script>
</body>
</html>
Why can't AJAX load another HTML page with JavaScript? It loads HTML,CSS,PHP etc... but not JavaScript. Is AJAX supposed to work like that? If so how can I load another HTML page that contains JS with AJAX?
A simple example what I mean
a.php
<!DOCTYPE html>
<html>
<body>
<div id="demo">
<h1>The XMLHttpRequest Object</h1>
<button type="button" onclick="loadDoc()">Change Content</button>
</div>
<script>
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("demo").innerHTML =
this.responseText;
}
};
xhttp.open("GET", "b.php", true);
xhttp.send();
}
</script>
</body>
</html>
b.php
<!DOCTYPE html>
<html>
<body>
<h1>b</h1>
<script>
document.write("Hello World!");
</script>
</body>
</html>
Screenshot of response:
Because the javascript code you'll get via ajax is a simple string and not executed. You have to eval() the code in the script tag like:
Example:
<script id="helloworld">
document.write("Hello World!");
</script>
JS:
var jsCode = document.getElementById('helloworld').textContent;
eval(jsCode);
Edit by request:
if (this.readyState == 4 && this.status == 200) {
var demoElement = document.getElementById("demo");
demoElement.innerHTML = this.responseText;
var scriptTags = demoElement.getElementsByTagName('script');
for(i = 0; i < scriptTags.length; i++) {
eval(scriptTag[i].textContent);
}
}
I want to make a page that the user put any word on textbox and returns all books with that word in (books is in mysql and i am gone to convert the query in xmlconvert.php)
<form id="keyword" >
<input type="text" name="value" id="book"/>
<br/>
<button onclick="showhint(functionvalue())">Search By Title</button>
</form>
there is the a function to get the word that user put and send it to ajax showhint();
<script>
function functionvalue() {
var bookname = document.getElementById('book').value;
return bookname;
}
</script>
there is the ajax code that get the responsetext from xmlconvert.php file where I got the q where is the word that user put and make a query with that word and return the books in xml
<script type="text/javascript">
function showhint(str) {
var ajax = new XMLHttpRequest();
ajax.onreadystatechange = function {
if (xhttp.readyState == 4 && xhttp.status == 200) {
document.getElementById("keyword").innerHTML = xhttp.responseText;
}
};
xhttp.open("GET","xmlconvert.php?q="+str,true);
xmlhttp.send();
}
</script>
I don't know if my thought is correct let me know if I can do that and how is possible to make it.
Sorry my English is not so good
You are assigning your new XMLHttpRequest to the variable ajax but then calling its commands with other names. If you named it ajax, you need to do ajax.readyState, ajax.status, ajax.open, ajax.send, etc.
So this should work:
<script type="text/javascript">
function showhint(str){
var ajax=new XMLHttpRequest();
ajax.onreadystatechange=function{
if (ajax.readyState == 4 && ajax.status == 200) {
document.getElementById("keyword").innerHTML = ajax.responseText;
}
};
ajax.open("GET","xmlconvert.php?q="+str,true);
ajax.send();
}
</script>
Need to make the following changes:
ajax.onreadystatechange should be a function definition so include () after the function keyword
XMLHttpRequest should be referenced through ajax var.
So the correct code would be:
<script type="text/javascript">
function showhint(str) {
var ajax = new XMLHttpRequest();
ajax.onreadystatechange = function () {
if (ajax.readyState == 4 && ajax.status == 200) {
document.getElementById("keyword").innerHTML = ajax.responseText;
}
};
ajax.open("GET","xmlconvert.php?q="+str,true);
ajax.send();
}
</script>