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Why does my jquery function not work on div in page loaded by ajax

I'm just starting out with jquery. Already learned some things and like it, but I have been struggling with the following issue for a few days.
I copied the "dialog-confirm"-function from https://jqueryui.com/. I placed this script between the tags on my index.php page.
<script type = "text/javascript">
$(document).ready(function(){
$(function() {
$( "#dialog-confirm" ).dialog({
resizable: false,
height:140,
modal: true,
buttons: {
"Delete all items": function() {
$( this ).dialog( "close" );
},
Cancel: function() {
$( this ).dialog( "close" );
}
}
});
});
$(window).resize(function() {
$('#scrollpage').height($(window).height() - 250);
});
$(window).trigger('resize');
$('.container').on('click', '.mainmenu', function(event){
event.preventDefault();
var url = $(this).attr('href');
$.get(url, function(data) {
//alert(data);
$("#div1").load(url);
});
$( this ).parent().addClass('current_page_item');
$( this ).parent().siblings().removeClass('current_page_item');
});
$('.container').on('click', '.rapport', function(event){
event.preventDefault();
//$(".dialog-confirm").dialog( "open" );
var url = $(this).attr('href');
$.get(url, function(data) {
//alert(data);
$("#div1").load(url);
});
});
});
</script>
If i place the matching div in the same index.php page. It works fine, the div pops up.
<div id="dialog-confirm" title="Empty the recycle bin?">
<p><span class="ui-icon ui-icon-alert" style="float:left; margin:0 7px 20px 0;"></span>Blablabla</p>
</div>
However when i place the div in a page which is loaded by ajax in the div1, then I cant get it to work.
<div class="scrollpage" id="scrollpage">
<div class="container" class="page" id="div1">
</div>
</div>
Can anyone explain to me why this is, and how I can fix this?

What's happening is that your $(document).ready() function executes as soon as the DOM is loaded. This DOM contains just what it is in the html file. At that time, there's no div with an id equal to 'dialog-confirm'. Loading pieces of HTML with ajax doesn't trigger a DOMReady event. What you've got to do is to call the .dialog() jQuery function AFTER you've loaded the div with Ajax:
$("#div1").load(url, function() {
$( "#dialog-confirm" ).dialog({
resizable: false,
height:140,
modal: true,
buttons: {
"Delete all items": function() {
$( this ).dialog( "close" );
},
Cancel: function() {
$( this ).dialog( "close" );
}
}
});
});

Here is what happens in your program(loading div with ajax):
First, your script initiates dialog window container by looking an element with id dialog-confirm.
Since, you don't have an element with that id yet, dialog container cannot be prepared.
There are two ways you can make it work:
Call dialog() after ajax requests,
Place div statically on page and change content with ajax request.
Solutions:
1- Use the code below instead of $("#div1").load(url);
$("#div1").load(url, function(){
$( "#dialog-confirm" ).dialog({
resizable: false,
height:140,
modal: true,
buttons: {
"Delete all items": function() {
$( this ).dialog( "close" );
},
Cancel: function() {
$( this ).dialog( "close" );
}
}
});
});
2- Place divs statically on your page:
<div class="scrollpage" id="scrollpage">
<div class="container" class="page" id="div1">
<div id="dialog-confirm" title="Empty the recycle bin?">
<p><span class="ui-icon ui-icon-alert" style="float:left; margin:0 7px 20px 0;"></span>Blablabla</p>
</div>
</div>
</div>
Then load just <p>... with $("#dialog-confirm").load(data); instead of $("#div1").load(url);.

Your jquery is executed only once after your page is loaded. Then is initiating everything needed for the tool!
This means every .container is being 'transformed'.
If you later add a new div.container it is not 'transformed' yet. You have to execute the jquery again after your div is appended!

How to Window.Open inside a jQuery Modal

I have my Modal Div as:
<div id="dialog-modal" title="Open File">
<img alt="progress" src="images/ajax-loader.gif"/>
</div>
On Click of Button I am able to see Modal and then see the progress icon.
<script type="text/javascript">
$(function () {
$('#button1').click(function () {
$('#dialog-modal').dialog("open");
});
$("#dialog-modal").dialog({
autoOpen: false,
height: 140,
modal: true,
});
});
</script>
But How can I do a operation or function on Load of Modal Window??
Let's say , I want to download a file from server , when the modal window appears (..showing the progress icon)

You can hook into the dialogopen function:
$( "#dialog-modal" ).on( "dialogopen", function( event, ui ) {
console.log('Wayhay!!');
window.open("http://www.google.com");
} );
See jsFiddle:
http://jsfiddle.net/3Y63f/1/
Further info here:
http://api.jqueryui.com/dialog/#event-open

jQuery: how to open a dialog window

I have a button in a my webpage; my expectation is when I click the button, it prompts a dialog window; in the dialog window, it has yes/no button; if I click yes, it opens a new page (gereated by php); if I click no, I stay on the old page. How can I do that?
<input type="button" name="terminate" value="terminate" id="terminate" title="Terminate" onclick="terminateIt();"/>

There are innumerable ways to do this.
Probably the most common way would be to use jQuery UI's Dialog.
They have an example in their demo of a dialog with two buttons. Here is a snipped from that demo:
HTML:
<div id="dialog-confirm" title="Empty the recycle bin?">
<p><span class="ui-icon ui-icon-alert" style="float:left; margin:0 7px 20px 0;"></span>Your question goes here. Are you sure?</p>
</div>
JS:
$( "#dialog-confirm" ).dialog({
resizable: false,
height:140,
modal: true,
buttons: {
Yes: function() {
window.open(....);
$( this ).dialog( "close" );
},
No: function() {
$( this ).dialog( "close" );
}
}
});
Check out the whole jQuery UI library. Tons of great stuff making it easy to do some basic things.

function terminateIt(){
var r = confirm("Go to new page?");
if( r == true ){
// redirect stuff here
} else {
// non redirect stuff here
}
}

why doesn't jquery confirm modal work on my app?

can someone please tell me why is the jquery confirm modal doesn't work on my app?
here's my code
<div id="dialog-confirm" title="Empty the recycle bin?">
<p><span class="ui-icon ui-icon-alert" style="float:left; margin:0 7px 20px 0;"></span>These items will be permanently deleted and cannot be recovered. Are you sure?</p>
</div>
here's the js code
if(userid == ""){
$( "#dialog:ui-dialog" ).dialog( "destroy" );
$( "#dialog-confirm" ).dialog({
resizable: false,
height:140,
modal: true,
buttons: {
"Delete all items": function() {
$( this ).dialog( "close" );
},
Cancel: function() {
$( this ).dialog( "close" );
}
}
});
}
there's no pop-up that come out, but when i tried the simple modal alert, it works
i have this in my header
jquery-ui.min.js

I solved my problem by including the dependency js files ROFL

JavaScript confirm box with custom buttons

Can I write a custom confirm box in JavaScript that, instead of the default OK and CANCEL button, shows a SAVE and DELETE button?

Use the jQuery UI Dialog Box for this.
You can do something like this:
JS:
$(function() {
$("#dialog-confirm").dialog({
resizable: false,
height: "auto",
width: 400,
modal: true,
buttons: {
"Do it": function() {
$(this).dialog("close");
},
Cancel: function() {
$(this).dialog("close");
}
}
});
});
<link href="https://jqueryui.com/jquery-wp-content/themes/jquery/css/base.css" rel="stylesheet"/>
<link href="http://jqueryui.com/jquery-wp-content/themes/jqueryui.com/style.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<div id="dialog-confirm" title="Is it treason, then?">
<p><span class="ui-icon ui-icon-alert" style="float:left; margin:12px 12px 20px 0;"></span>Am I the Senate?</p>
</div>

Not with the native JavaScript confirm box. You could use one of the many JavaScript UI components that emulate modal dialogs to do this instead.
Here's an example: https://jqueryui.com/dialog/#modal-confirmation
I've never used this so use at your own risk.

$('confirm text').dialog(
{
modal:true, //Not necessary but dims the page background
buttons:{
'Save':function() {
//Whatever code you want to run when the user clicks save goes here
},
'Delete':function() {
//Code for delete goes here
}
}
}
);
This should work, but you will need to download or link to jQuery and the jQuery UI libraries to run this.