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How do we 'dispose' a Bootstrap modal?

I have a small application I am developing to learn AJAX and JavaScript. In this I have method saveData() that is triggered when a save button is clicked. All is working fine, but I realized that the page was refreshing so I searched the web and found the JavaScript method event.preventDefault(). This method worked fine. But that got me into problem, my modal dialog was staying open instead of closing. Again, I found hide method to "close" the modal. That solved it, BUT when I click the to open the modal it is bringing me the recent data I sent to the DB. I am from Java background and I began to think that hidedid not kill the modal.
My question: Is there a method to completely destroy the modal the way is done with JFrame.dispose()method in Java?
The code I was using is below:
function saveData(){
var name=$('#nm').val();
var email=$('#em').val();
var phone=$('#hp').val();
var address=$('#al').val();
event.preventDefault();//prevent the page from refresh
$.ajax({
type:"post",
url:"server.php?p=add",
data:{nm:name,em:email,hp:phone,al:address},
success: function(data){
viewData();
$('#addData').modal('hide');//close the modal.
}
});
}

You can just clear the values in your input tag every time you open the modal.

I already faced this problem with the modal for clear all value.but i using the follow code after hiding the modal.
My modal id is #modal
$('#modal').hide();
$('#modal')
.find("input,textarea,select")
.val('')
.end()
.find("input[type=checkbox], input[type=radio]")
.prop("checked", "")
.end();
if you have any prolem then you can refer the link that may help you : How to clear all input fields in bootstrap modal when clicking data-dismiss button?

Making jquery Dialog working between two pages

I have a dialog setup as follow
$("#myDialog").dialog({
autoOpen: true,
close: function(event, ui) {
$("#myDialog-content").html("");
$(this).dialog("destroy");
}
});
$("#myDialog").css("min-height","");
$("#myDialog-content").html("Loading...");
$.ajax({
...
success: function(response) {
$("#myDialog-content").html(response);
}
});
This working fine I load and close dialog in same page but not able to make it work properly where I move between pages.
Here is a my page flow
From source page(say PageA) I make AJAX call to load the page containing dialog div(say PageB).
Link on this page call above method to display dialog. (For first time it runs OK).
When I click close button. Dialog close and with firebug I can still see dialog div at the end with UI classes but in hidden state.
If I go back to source page (Page A) and reload the PageB.In firebug I can see two div - one originally from JSP and second one from step 3.
Now if I click button to load dialog box - It used hidden to populate new data and never use new div created by jquery. So I just have blank dialog box.
I am not sure if this is jquery Dialog issue or my page flow. One possible solution I though of is use remove in close function to remove dialog div completely but it puts burden to create this div everytime page PageB is loaded. Is there any other way or any thing I am doing wrong in this scenario?

If i understood correctly the situation, You have 2 options:
If you somehow cleaning the content of "Page B", remove the modal
then.
If you do not have the cleaning mechanism like that, just
.remove() content of modal on close
Sidenote: i would advise not to use jquery for .css and .html('Loading...'). Also, it is good to cache jquery elements in variables e.g var dialog = $("#myDialog");

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 can I add content to a modal like divs loaded via ajax

I have a page where I have a gallery of thumbnails. On clicking on one, I'd like to display a bigger image followed by more information about the picture in a modal-like manner, as has been done here Click on the image to see what I mean. Content is to be loaded via ajax. I would also like to preload the larger images such that when as a user clicks on a thumbnail they will be able to view the larger image as they wait for the additional information to load. I'm new to modals, so how can I be able to achieve this.

The loading content dynamically via ajax is simply appending to the dom (or the div/container that is displaying the modal dialog). By appending to it when the ajax request arrives you will in effect refresh the look of the modal dialog to reflect the new content.
I don't think you will find a modal dialog that "supports ajax". Rather you are looking for one that fires a event on before rendering or as the dialog is opening so that you can create your ajax call then. jQuery UI modal dialog supports this feature.
$( ".selector" ).dialog({ //open the dialog
open: function( event, ui ) { //fire function before rendering
$.ajax({ //make your ajax call to get content
url: "test.html",
type: "POST",
data: "name=value&name=value",
success: function(html){
$(this).append(html); //append your content to the dialog
}
});
}
});

Link in AJAX HTML response loses onclick after being clicked

I have an element containing data from an AJAX request. The AJAX data is returned from another page. The returned data in the element contains a link, which when clicked, opens a jQuery overlay. The onclick event is attached to the link (a onclick="...") from the external data, and the overlay function is on my main page.
This all works fine until the user clicks the link which opens the overlay. When the overlay is closed, the link becomes disabled, losing its onclick event, and the overlay cannot then be reopened.
Is this a focusing problem or do I somehow have to rebind the event to that link? I'm not sure what is going on here, or how to fix it, I hope some kind person can help me out.
This is what loads the external data in to the element:
function load_upload_queue() {
$.ajax({ type : 'GET', url : myDomain,
dataType : 'html',
success : function(data) { $('#myElement').html(data); },
error : function() { // do something }
});
}
This is the link inside of the element, which comes from AJAX call above:
<a onclick="show_error_overlay(id)">Show Errors</a>
This is my open overlay function, sitting on the main page:
function show_error_overlay(token) {
$("#show_error_overlay").overlay({
mask: '#111111',
close: "a.closeOverlayBtn",
closeOnClick: false,
closeOnEsc: false,
load: true,
onLoad: function() { // do something },
onClose: function() { // do something }
});
}
Any help gratefully received, any questions please do not hesitate to ask :)

I would use Firefox+Firebug to monitor whether that A tag is being touched (moved, changed) by anything as the overlay opens and closes. See if it maintains the same position; most importantly, check if it still has the onclick value after the overlay goes away. Inspect your "do somethings" in onLoad and onClose for any code that may be doing something to that link. Also, check for JS errors, especially during/after closing the overlay - sometimes errors interrupt the process, leaving unrelated things in unexpected state, causing unrelated problems.