Using JavaScript, I am integrating content from a PHP file on a different server. Unfortunately, this external service can be unreliable at times, causing delays in loading or not loading at all.
I am looking for a way in JavaScript to attempt retrieving the external data for a specific duration before deciding to stop including the JavaScript content.
If you are referring to
<script src="javascript.php"></script>
then the answer is no, which is why JSONP may not be the best solution in these situations.
However, you could potentially utilize setTimeout to test for a specific variable in the JavaScript code and trigger an error if the variable or function is not found.
Here's an example:
<script>
var start = new Date();
var tId;
function testFunction() {
var end = new Date();
if ((end.getTime() - start.getTime()) > 10000) {
alert('Timeout reached: Aborted')
}
else if (someFunction) { // Ensuring someFunction exists in the external JS
someFunction()
}
else tId = setTimeout(testFunction, 1000)
}
</script>
<script src="javascript.php"></script>
<script type="text/javascript">
var jsLoaded = false;
setTimeout("callback()", 2000);
function callback() {
if (!jsLoaded) {
alert("Oops! JavaScript still hasn't loaded after 2 seconds.");
} else {
alert('Success: Loaded');
}
}
</script>
<script type="text/javascript" id="foo" src="url.js" onload="jsLoaded=true"></script>
Now, the challenge is to halt the script loading process. Removing the <script> element from the DOM hasn't stopped it...
If your .js file is on the same domain, consider using the AJAX technique to load the JavaScript externally (refer to this link)
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