Javascript function is not defined, ReferenceError - javascript

I'm just trying to execute an Ajax request but instead end up having a ReferenceError: getData is not defined on Console. And this piece of code worked fine 6 months back or so. I've already referred some previously asked questions but no good.
Here's the code:
<html>
<head>
<script language = "text/javascript">
var XMLHttpRequestObject = false;
if (window.XMLHttpRequest) {
XMLHttpRequestObject = new XMLHttpRequest();
} else if (window.ActiveXObject) {
XMLHttpRequestObject = new
ActiveXObject("Microsoft.XMLHTTP");
}
function getData(dataSource, divID)
{
if(XMLHttpRequestObject) {
var obj = document.getElementById(divID);
XMLHttpRequestObject.open("GET", dataSource);
XMLHttpRequestObject.onreadystatechange = function()
{
if (XMLHttpRequestObject.readyState == 4 &&
XMLHttpRequestObject.status == 200) {
obj.innerHTML = XMLHttpRequestObject.responseText;
}
}
XMLHttpRequestObject.send(null);
}
}
</script>
</head>
<body>
<form>
<input type = "button" value = "Fetch the message"
onclick = "getData('data.txt', 'targetDiv')">
</form>
<div id="targetDiv">
<p>The fetched message will appear here.</p>
</div>
</body>
</html>

Your browser doesn't know what language "text/javascript" is. It only knows the language "javascript" and the MIME-type "text/javascript". You're mixing the two up.
You could either change it to language="javascript" or type="text/javascript".
<script type="text/javascript">
language is an outdated attribute anyway; type is more modern.

Related

Rapidapi Api request with XMLHttpRequest

this is my second post, I hope to be luckier than last time end get some reply. 🙂
I’m trying to make a Rapidapi api request working with javascript ”XMLHttpRequest”
I must say that the api works perfectly with ios siri shortcut.
this is the code provided from apirapit site on the "XMLHttpRequest" section:
var data = null;
var xhr = new XMLHttpRequest();
xhr.withCredentials = true;
xhr.addEventListener("readystatechange", function () {
if (this.readyState === this.DONE) {
console.log(this.responseText);
}
});
xhr.open("GET", "https://download-video-youtube1.p.rapidapi.com/mp3/medPORJ8KO0");
xhr.setRequestHeader("x-rapidapi-host", "download-video-youtube1.p.rapidapi.com");
xhr.setRequestHeader("x-rapidapi-key", "[my key here]");
xhr.send(data);
And this is my code:
<!DOCTYPE html>
<html>
<body>
<h2>The XMLHttpRequest Object</h2>
<button type="button" onclick="loadDoc()">Request data</button>
<p id="demo"></p>
<script>
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.withCredentials = true;
url='https://download-video-youtube1.p.rapidapi.com/mp3/xF5t2jOsCt8';
xhttp.onreadystatechange = function() {
if ((this.readyState == 4 && this.status == 200 )||(this.readyState === this.DONE)) {
document.getElementById("demo").innerHTML = "ciao" + this.responseText;
}
};
xhttp.open("GET", url);
xhttp.setRequestHeader("x-rapidapi-host", "download-video-youtube1.p.rapidapi.com");
xhttp.setRequestHeader("x-rapidapi-key", "[my key here]");
xhttp.send();
}
</script>
</body>
</html>
Just to testing I created a simply bank html page to have the JSON response beneath the button just after pressing it. The result is just the string “ciao” i set before the this.responseText. If I remove the apikey or modify it with a wrong value an JSON error message appear ( so like the case posted, as I intentionally removed it).
Otherwise as said noting but “ciao” string
Is there any syntax error? Is there a logical reason why it behave like this?
Thanks
Franco
Trying adding a data variable as null. That's what RapidAPI provides in their code snippet.
function loadDoc() {
const data = null
var xhttp = new XMLHttpRequest();
xhttp.withCredentials = true;
url='https://download-video-youtube1.p.rapidapi.com/mp3/xF5t2jOsCt8';
xhttp.onreadystatechange = function() {
if ((this.readyState == 4 && this.status == 200 )||(this.readyState === this.DONE)) {
document.getElementById("demo").innerHTML = "ciao" + this.responseText;
}
};
xhttp.open("GET", URL);
xhttp.setRequestHeader("x-rapidapi-host", "download-video-youtube1.p.rapidapi.com");
xhttp.setRequestHeader("x-rapidapi-key", "my key here");
xhttp.send(data);
}

How to load a script in a php file called from a Ajax Request?

I have this JavaScript:
<script>
if (str == "") {
document.getElementById("txtHint1").innerHTML = "";
return;
} else {
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 = function () {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("txtHint1").innerHTML = this.responseText;
}
};
xmlhttp.open("GET", "/npsmart/umts/action_plano/?q=" + query1, true);
xmlhttp.send();
}
</script>
And this JavaScript call a page called getuser.php.
This is the code of getuser.php:
<!DOCTYPE html>
<html>
<body>
<p id="dumb"></p>
<script>
document.getElementById("dumb").innerHTML = "WORK";
</script>
</body>
</html>
What I would like is only to change the paragraph content, called dumb, to WORK. But when I call the page and it loads, my paragraph content keep null.
It's like my Ajax Call Request don't execute the Script Tag.
EDIT:
I have already solved my problem with this simple but genious solution:
function showUser() {
if(query_num == 2){
if (str == "") {
document.getElementById("txtHint1").innerHTML = "";
return;
} else {
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 = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("txtHint1").innerHTML = this.responseText;
eval(document.getElementById("runscript").innerHTML);
}
};
xmlhttp.open("GET","/npsmart/umts/action_plano/?q="+55555,true);
xmlhttp.send();
}
And in my getuser.php file:
<script type="text/javascript" id="runscript">
document.getElementById("dumb").innerHTML = "WORK";
</script>
I just putted the : eval(document.getElementById("runscript").innerHTML); in my function and then in the php file I called this script using this:
<script type="text/javascript" id="runscript">
So thanks everybody =)
Hope this post can help other people.
JS is not executed automatically from a script embedded in the response.
Since getuser.php is a PHP script there's no need to use JS and have the browser set the paragraph content. Use PHP itself:
<!DOCTYPE html>
<html>
<body>
<p id="dumb"><?php echo 'WORK'; /* or anything else */ ?></p>
</body>
</html>
Otherwise you'll have to use JS eval on the returned AJAX response to have the browser run the JS returned from your script. But I recommend against this.

javascript with XMLHttpRequest not working

I have tried everything suggested in questions of similar nature but this very basic code is just not working. I just want to receive the message from the php code in the same file using XMLHttpRequest.
<!DOCTYPE html>
<head></head>
<body>
<div id="qwer" style="height:50px;width:40px"></div>
<script type="text/javascript">
function check() {
var ualias=document.getElementById('ualias').value;
var resu=document.getElementById("qwer");
var params="username="+ualias;
var hm = new XMLHttpRequest();
var url = "http://'my-domain-name'/try.php";
hm.open("GET", url+"?"+params, true);
hm.onreadystatechange = function(){
if(hm.readyState == 4 && hm.status == 200) {
var return_data = hm.responseText;
resu.innerHTML=return_data;
} else {
resu.innerHTML="error";
}
hm.send(null);
resu.innerHTML="CHECKING...";
}
}
</script>
<?php if(isset($_GET['username'])) {
$u=$_GET['username'];
echo $u;
exit();
} ?>
<input id='ualias' type='text' onblur=''>
<button type='button' onclick="check()">Go!</button>
</body>
</html>
The browser (Google Chrome) isn't showing anything for the onclick event.
It finally worked. I made the following edits.
<!DOCTYPE html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
function check()
{
var ualias=document.getElementById('ualias').value;
var resu=document.getElementById("qwer");
var params="username="+ualias;
var hm = new XMLHttpRequest();
var url = "http://www.websamaj.in/try.php";
hm.open("GET", url+"?"+params, true);
hm.onreadystatechange = function(){
if(hm.readyState == 4 && hm.status == 200)
{
var return_data = hm.responseText;
resu.innerHTML=return_data;
}
}
hm.send(null);
resu.innerHTML="wait...";
}
</script>
<?php
if(isset($_GET['username']))
{
$u=$_GET['username'];
echo $u.",you are finally here!:)";
exit();
}
?>
<input id='ualias' type='text' onblur=''>
<button type='button' onclick="check()">Go!</button>
<div id="qwer" style="height:50px;width:100px;background-color:#CCC;"></div>
</body>
</html>
Apparently, the else condition there in onreadystatechange function was causing a problem. I would love it if anybody could tell me why exactly was that creating a problem. As far as i know, onreadystatechange event is called each time the state changes. So in my previous code, "error" should be overwritten thrice on the div and then, when the state changes to 4 and 200, the responseText should be overwritten, since i didnt use append. So, an explanation would be highly acknowledged. Thank you!
In your original code, hm.send(null) and resu.innerHTML="CHECKING" lines are actually INSIDE the onreadystatechange callback:
hm.open("GET", url+"?"+params, true);
hm.onreadystatechange = function(){
if(hm.readyState == 4 && hm.status == 200) {
var return_data = hm.responseText;
resu.innerHTML=return_data;
} else {
resu.innerHTML="error";
}
hm.send(null); // <-- wrong place!
resu.innerHTML="CHECKING...";
}
In your edited version, you moved them out of there (fixed indention):
hm.open("GET", url+"?"+params, true);
hm.onreadystatechange = function(){
if(hm.readyState == 4 && hm.status == 200) {
var return_data = hm.responseText;
resu.innerHTML=return_data;
} else {
resu.innerHTML="error";
}
}
hm.send(null);
resu.innerHTML="wait...";
The reason you didn't notice this is because in your edited version, you didn't indent your blocks correctly. Recommend always keeping your code formatted consistently, even when hacking around, so you can see the code blocks.

XMLHttpRequest connection check

I am trying to write a streamlined version of a XMLHttpRequest demo script shown here:
http://www.w3schools.com/ajax/tryit.asp?filename=tryajax_first
I'm only going to use this on iPad, so I don't have to check for older versions of IE, and so on. On button click, I want to check if the connection exists. Here's my entire html page, including JavaScript snippet:
<html>
<head>
<script>
var myURL = "http://www.google.com";
function testConnection(url) {
var xmlhttp;
xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
alert("Connected!");
} else {
alert("Not connected!");
}
}
xmlhttp.open("GET", url, true);
xmlhttp.send();
}
</script>
</head>
<body>
<button type="button" onclick="testConnection(myURL)">Test Connection</button>
</body>
</html>
For some weird reason, even though I'm online, when I click the button, I get repeated "Not connected" alerts, and only after a while I get the "Connected" alert, followed by no alerts.
Looks like I messed up, but I can't see where. What should I change to make it work?
If you can use xhr2, you can learn stuff from this tutorial and rewrite your code to something like this:
function testConnection(url) {
var xmlhttp = new XMLHttpRequest();
xmlhttp.onload = function() { alert("Connected!"); }
xmlhttp.onerror = function() { alert("Not Connected"); }
xmlhttp.open("GET",url,true);
xmlhttp.send();
}
If you send request to another domain, you may get error even if it exists, if the target server has Same-Domain-Policy restriction (default). If the target server is on another domain, it must send header
Access-Control-Allow-Origin: *

JavaScript xmlhttp read from feed

I'm trying to use javascript and read from http://search.yahooapis.com/ WebSearchService /V1/webSearch?appid=YahooDemo &query=persimmon&results=2 using xmlhttp. I'm getting an error because it cannot read
<script type="text/javascript">
url="http://search.yahooapis.com/ WebSearchService /V1/webSearch?appid=YahooDemo &query=persimmon&results=2";
var xmlhttp = null;
if (window.XMLHttpRequest)
{
xmlhttp = new XMLHttpRequest();
if ( typeof xmlhttp.overrideMimeType != 'undefined')
{
xmlhttp.overrideMimeType('text/xml');
}
}
else if (window.ActiveXObject)
{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else
{
alert('Perhaps your browser does not support xmlhttprequests?');
}
xmlhttp.open('GET', url, true);
xmlhttp.send(null);
xmlhttp.onreadystatechange = function()
{
if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
{
alert("success");
}
else
{
alert("failure");
}
};
</script>
Unless your web site is hosted on search.yahooapis.com you're probably encountering the Same Origin Policy.
This is causing your outgoing request to return with a 404 status code:
You should be using JSONP instead of XMLHttpRequest:
<!DOCTYPE html>
<html>
<head>
<title>JavaScript file download</title>
<script type="text/javascript">
function yahooApi(resp) {
var scriptEl = document.getElementById("yahooApiJsonP");
scriptEl.parentNode.removeChild(scriptEl);
console.log(resp);
}
window.onload = function() {
var scriptEl = document.createElement("script");
scriptEl.id = "yahooApiJsonP";
scriptEl.src = "http://search.yahooapis.com/WebSearchService/V1/webSearch?output=json&callback=yahooApi&appid=YahooDemo&query=persimmon&results=2";
document.body.appendChild(scriptEl);
};
</script>
</head>
<body>
<p>This is a test</p>
</body>
</html>
This will send the request, which will return a 200 OK status:
It also looks like this service has been shut down:

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