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How Can I Triger Change Event For HTML Select (Dropdown)?

My HTML page has a Button and a Select Drop-Down (Combo Box). Drop-Down change event is like this:
$('#DDL_ID').on('change', function (e) {
// Some Code Here
});
When I click the button, I am setting some value to Drop-Down and it is working fine.
$('#BTN_ID').on('click', function (e) {
$('#DDL_ID').val('123');
});
When I click the button, Drop-Down value is getting changed but Drop-Down change event is not firing. Can anyone help me on this?
Please note this is not a duplicate question.

Setting the val() through jquery will not automatically trigger the event on the item... so you need to manually trigger() it...
$('#BTN_ID').on('click', function (e) {
$('#DDL_ID').val('123').trigger('change');
});

How to keep input text focus still when clicked on div?

Just like title says, I'm trying to keep the input text focus still when click on one div.
Specifically I'm trying something like what happens in Google Livesearch (Not Instant Search) (When you type there, shows a ten items list.) (I can't put an image).
When you click on "Google Search", still keeps input text focus.
I'm trying but always lose the input text focus.
Someone knows how to achieve this?.
P.S: With click I mean the mousedown event.
Thanks in advance.

You can try to refocus on your text input when a mousedown event is caught on your division.
Here is a quick example using jQuery:
$("#my-division").on("mousedown", function (evt) {
$("#my-input").focus();
});

Check this solution:
First, store the last focused element:
var lastFormElementFocused = 'my-first-element-id';
$(document).on('focus', '.your-class', function() {
lastFormElementFocused = $(this).attr('id');
console.log(lastFormElementFocused);
});
After that, in your onClick event:
$(document).on('click', "div.your-class", function() {
$("#" + lastFormElementFocused).focus();
var element = $(document.activeElement);
// Do with 'element' what you want
});
Note that you need to have an assigned id in each element you focus.

Jquery check box change function not working in IE 8

I have following jquery code, where on click of a check box I will show a popup value.
Except in IE,in all other browser it works as expected. That is, on change the check box will be checked and the popup will be opened.
However in IE8 its not getting checked, however popup is displayed properly.
Code :
$('#TAndC').change(function(){
if( $('input[name="TAndC"]').is(':checked'))
{
$('#TandCBox').show();
var termsandcondition = GetEnum().TermsandConditionsPageId;
var actionURL = '#Url.Action("ShowTAndC", "Account", new { isFromCheckBox = true })';
$('.popUpForm').load(actionURL);
var msgBox = $('#terms').attr('href');
MaskMsgPopUp(msgBox);
return false;
}
});

If your element is a checkbox and not a dropdown then use click anyway.
If your selector is referring to a dropdown use click if you need to support IE8 and older.
See why that is below.
According to the MSDN for change/onchange, the event is not triggered until the change is committed.
In addition the event is also not triggered when the value is changed programmatically.
To quote:
This event is fired when the contents are committed and not while the
value is changing. For example, on a text box, this event is not fired
while the user is typing, but rather when the user commits the change
by leaving the text box that has focus. In addition, this event is
executed before the code specified by onblur when the control is also
losing the focus. The onchange event does not fire when the selected
option of the select object is changed programmatically. Changed text
selection is committed.
To invoke this event, do one of the following:
Choose a different option in a select object using mouse or keyboard navigation.
Alter text in the text area and then navigate out of the object.
If you must support IE8 and older, you are probably better of to use the click event instead which get's triggered when you release the mouse and your new choice is selected.

instead of .change use below code and try
$(document).ready(function(){
$(document).on('click','#TAndC',click_function){
if( $('input[name="TAndC"]').is(':checked'))
{
$('#TandCBox').show();
var termsandcondition = GetEnum().TermsandConditionsPageId;
var actionURL = '#Url.Action("ShowTAndC", "Account", new { isFromCheckBox = true })';
$('.popUpForm').load(actionURL);
var msgBox = $('#terms').attr('href');
MaskMsgPopUp(msgBox);
return false;
}
});
});

Prevent an element from losing focus

We have a lot of inputs in a document.
We want to open a dialog that generates text and puts that in the currently focused input.
The problem is that, when I click a button or anything else to open the dialog that input loses focus. I can't determine which input has to get the generated text.
$("#button").click(function(){
// something should goes here to prevent stealing inputs focus
});
Is there any solution to prevent stealing focus by that special button?

You could not use a form button and just use say a <span> make it behave like a button?
UPDATE:
You could use something like
$('span').hover(function(){
focused_element = $("*:focus").get(0);
});
$('span').click(function(){
focused_element.focus();
});
Check out my fiddle

Does your field have a unique ID? If it does, use that ID to set the focus back to the field when the dialog's save/close button is clicked.
Don't worry about having the focus stolen as much as resetting it once you are done.

My solution would be to handle every focus and save it in focusEle:
$(function () {
var focusEle;
$('*').focus(function () {
focusEle = this;
});
$('button').click(function (e) {
console.log(focusEle);
var c = confirm('Love the cat :3?');
$(focusEle).focus();
});
});
With HTML as:
<input type="text">
<button>Press me!</button>
Example is working: http://jsfiddle.net/76uv7/
Depending on #ggzone idea

Javascript virtual keyboard: how to indentify text fields?

I'm developing a Javascript virtual keyboard, and I would like it to appear everytime a user press enter on a text fields. But how can I know if a text (or any input) field is selected?
--clarification
I have to information or control over the page that will be loaded. I just want that, if a input field is selected and the user press enter, my virtual keyboard shows up.
--update
Does it makes any difference if what I'm trying to do is a firefox extension? (I think it shouldn't)

use jQuery and add the following
$(document).ready(function() {
//apply action to input elements by class
//$("#.input_class").keypress(function(e) {
//apply action to all input elements ( input, textarea, select and button )
$(':input').keypress(function(e) {
if(e.keyCode==13){
// Enter pressed... do anything here...
alert($(this).val());
} else {
//make shure you get the desired action for other keys pressed
xTriggered++;
}
//do not submit the form
return false;
});
});

bind it to the onfocus event. That event is triggered when the input element gets the focus. You could remove the keyboard again on the onblur event if you want to hide it again.

To get notified that a text field is selected, you could attach an event handler to onfocus of the fields you're interested in.
Example in jQuery (jQ chosen for brevity, the event works in plain JS):
$('input[type="text"]').focus(function(event){
// do something here
});
If you only care to capture the "enter" key, you don't need to worry about focus, just attach to the onkeypress event of the textfields (see #poelinca's answer).

Despite of what jquery apologetes say, there is no hassle to instrument all fields without resorting to large and slow external library:
for (var i = 0; i < document.forms.length; i++)
for (var j = 0; j < document.forms[i].elements.length; j++)
if (document.forms[i].elements[j].tagName.match(/^INPUT$/i))
if (document.forms[i].elements[j].type.match(/^TEXT$/i))
document.forms[i].elements[j].addEventListener('focus', function(){/* your stuff here */}, false);

My solution, for now, was use a specified key just to open the virtual keyboard when the user request.