I want the page to be completely loaded before making an ajax call to update the database. I can trigger a JavaScript function in the body's onload event to ensure the page is fully loaded, but I'm unsure how to initiate the Ajax call from there. Is there a more efficient way to accomplish this (updating the database after the page has loaded)?
One way to easily update a database using JavaScript is by leveraging a library like jQuery. Here's an example using jQuery:
$(document).ready(function(){
$.ajax({ url: "database/update.html",
context: document.body,
success: function(){
alert("done");
}
});
});
If you prefer not to use jQuery, a basic version would look something like this, but keep in mind it may not handle browser differences or errors effectively:
<html>
<body onload="updateDB();">
</body>
<script language="javascript">
function updateDB() {
var xhr = new XMLHttpRequest();
xhr.open("POST", "database/update.html", true);
xhr.send(null);
/* ignore result */
}
</script>
</html>
For more information, check out the following resources:
If you want to streamline the process, jQuery is your best bet.
$(document).ready(function() {
// Insert your Ajax code here.
});
For more information, visit this link:
http://docs.jquery.com/Tutorials:Introducing_%24%28document%29.ready%28%29
Doing it without a library is a breeze
window.onload = function() {
// code
};
Alternatively, using Prototype:
Event.observe(this, 'load', function() { new Ajax.Request(... ) );
Or even better, define the function elsewhere rather than inline, and then:
Event.observe(this, 'load', functionName );
It is not necessary to specifically use jQuery or Prototype, but it is recommended to utilize some sort of library for event handling. Either library will manage event handling more consistently than onload, making it easier to process the Ajax call. If you prefer utilizing the body onload attribute, you can simply call the same function as shown in these examples (
onload="javascript:functionName();"If your database update does not rely on the page being fully rendered, why wait until then? You could include a call to the Ajax-calling function at the end of the JavaScript on the page for nearly the same effect.
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