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how to run jquery code after hml form submission

this is my javascript code :
<script type="text/javascript">
$(document).ready(function(){
$('#saveBtn').click(function(){
var prenom_length = $('#form_prenom').val().length;
if (prenom_length<5) {
$('#prenom_error').html("please enter an other name");
}
});
});
</script>
the jquery code is working few seconds after form submission the displays the error text just before the page reloads but after reloading the page it disappears , i want it to keep the same text even after the page refresh how to do ?

If I understand you correctly, you want to show an error message after someone submits the form so that they know they should correct it. By default if you press a submit button in an HTML form the browser wil send the request to the server and the server will give the user a new page.
You want to prevent that last bit from happening. The browser should execute your jQuery and if you find an error in the form you want to prevent that default submit to the server from happening. As it happens (pun intended) jQuery can do exactly that, check out the documentation here.

How to use information from the URL to click on specific button?

I'm working on a group project for a class, and we have a webpage that is split into different tabs, so it is only one webpage, but appears to be different pages using Jquery so the page doesn't have to reload when switching between tabs. The problem I am having is that one of the tabs has a form to get information from the user, then after the user clicks the submit button, the info is sent to the database using php, causing the page to reload. Then depending on if the information was successfully sent to the database, there will be either "success" or "invalid" appended to the end of the URL. If the user submits this form, we want them to automatically come back to this tab on the reload, and I have tried doing this by using a script like this:
<script>
document.getElementById("baseTab").click();
window.onload = function() {
var theurl = document.location.href;
if (theurl.includes("success") || theurl.includes("invalid") {
document.getElementById("infoTab").click();
}
};
</script>
The baseTab is the tab we want to load whenever someone first loads the webpage, unless they have just submitted the form on the infoTab page. This code structure works on a simple test webpage I run on my computer, but when I try to push it to our project repository, it will only do the "baseTab".click, and not click the "infoTab" button even if theurl includes "success" or "invalid". I tried doing it without the window.onload(), but that doesn't work either. Also, if I do
if (theurl.includes("success") || theurl.includes("invalid") {
document.getElementById("infoTab").click();
}
else {
document.getElementById("baseTab").click();
}
then neither of the buttons get clicked. If their is an easier way to do this or you see where I am going wrong, any help would be appreciated. Thanks!

JavaScript Setting property of a disabled button

PRE EDIT: It turned out that it was not about the disability of the button, but making some other actions after save. I debugged the page and found out that after making changes on a saved form, then page loses the javascript functionality in the (document).ready part. I've added the solution as an answer.
I have an entry page which has two buttons save and approve. The mechanism is something like, you can fill the form and save, then approve. You can also reach a saved page by refreshing the page or from the list of your saved pages.
The approve button is disabled if the form is not saved. I enable it from code behind after saving. Approve button also has a confirm button extender which takes its confirm text from javascript. I load it in (document).ready and its code is:
$(document).ready(function () {
$("#ASPxSplitter1_ContentPlaceHolder1_uctActivityEntry1_tbActivity_tbHistory_btnApproveActivity_btnApprove").click(function () {
$("#ASPxSplitter1_ContentPlaceHolder1_uctActivityEntry1_tbActivity_tbHistory_btnApproveActivity_lblMessage").text(GetConfirmTextForApprove());
});
});
,where GetConfirmTextForApproval() makes some calculations and returns the confirm text.
Now, my problem is, as the button is disabled when you open the form, the code above is not rendered at the first page load. This leads to the problem that, when I start to fill a form and save it, then approve it, I don't get any confirm text, because it does not run the function. But after refreshing the page or after I go to a saved form's page from another page, I get the proper confirm text.
So, how can I solve this problem? How can I get the proper confirm text even though the button is disabled at the first page load?
Note: I have to add that after saving, the url of the page is changed. The query string is added. That might also cause the problem.

You can use
// Disable #x
$( "#x" ).prop( "disabled", true );
// Enable #x
$( "#x" ).prop( "disabled", false );
But not when document ready, you need enable button when you want. Then you need create a event listener
$("#button").click(function(){
//Your code
if(GetConfirmTextForApproval()){
//You active the button and the text that you want show.
}
});

Solved my own problem:
As it was said in the pre edit of the question, the problem was caused because of making changes after the save. I've changed my function as:
$(document).ready(function () {
SetConfirmMessageForApproval();
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
});
function EndRequestHandler(sender, args) {
SetConfirmMessageForApproval();
}
function SetConfirmMessageForApproval() {
$("#ASPxSplitter1_ContentPlaceHolder1_uctActivityEntry1_tbActivity_tbHistory_btnApproveActivity_btnApprove").click(function () {
$("#ASPxSplitter1_ContentPlaceHolder1_uctActivityEntry1_tbActivity_tbHistory_btnApproveActivity_lblMessage").text(GetConfirmTextForApprove());
});
}
This helps, if anyone else needs it.

How to get rid of this message form the alert?

I have an alert which appears to state that data has been submitted. Problem is thought that when the alert appears it comes up with this dialogue in the alert "Prevent this page from creating additional dialogues" or something like that.
How can I get rid of this from the alert? If I can't get rid of it then is there are way I can get something like a prompt box or a confirmation box which only has an 'OK' button to appear because I don't want like the "Prevent this page from creating additional dialogues" message.
Below is my code:
function submitform()
{
var fieldvalue = $("#QandA").val();
$.post("insertQuestion.php", $("#QandA").serialize() ,function(data){
alert("Your Details for this Session has been submitted");
var QandAO = document.getElementById("QandA");
QandAO.submit();
});
}

You can't stop this from happening. Good browsers provide the option to prevent scripts from spawning alerts because alerts are often annoying. If this option could be revoked by the script, what has been gained?

The reason why you get it for that alert and not for the other one is because this alert will be fired programmaticly at the difference to be initiated by the user action.
open firebug
alert('hello')
Everytime this alert is called it show a conventional alert without the checkbox
setInterval(function(){
alert('hello')
}, 500)
The first alert is normal the second one got the checkbox and allow you to prevent future alert because as steve says "good" browser can kind of understand something and have built in "supposedly helper"
Steve is right when he says that the message can not be removed but you can only control how the alert is open.
Perso I will not recommend you to use native alert because while the alert is open all the code on the page remain halted meaning nothing happen behind the popup. This can be annoying depending on your app.

PHP and window.close in JavaScript

I have a problem. I have a page that when you click a button, a popup with a form is shown. So, I complete some data and I submit. What I want to do is, to submit the form, close the form and refresh the parent page. I don't want to do it with AJAX.
The problem is that in my parent page I have to refresh content with the input information of the form.
So when I refresh, sometimes the data is shown and sometimes not. Do you know why this could happen?
I just use onsubmit="refreshParent()" in my form. The info is stored always in my database, so I think the problem may be that sometimes the refresh catches the new info and sometimes not.
function refreshParent() {
window.opener.location.reload();
window.close();
}

I use this to reload the page that opened a popup window:
<script language="JavaScript">
<!--
function reloadParentPage() {
window.opener.location.href = window.opener.location.href;
if (window.opener.progressWindow) {
window.opener.progressWindow.close()
}
window.close();
}
//-->
</script>
By the way, the code above is called by a link or button in the popup page.

You have a race condition between the script doing the insert and the script reloading the parent.
The solution is to call refreshParent on the page after the submit - that way you know the data is in the database. You don't even have to do it on document ready - return a stub page that just defines and calls refreshParent in the head tag.

In PHP when you run post script, at the end, include this code :
echo '<html><script language="javascript">
parent.location.href="http://'.$_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"].'"; // or any other url
</script></html>';
This will output a javascript that will reload the windows.