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How do I set the selected value of a dropdown in Orbeon Forms using Javascript?

I need to set the selected value of a dropdown control in an Orbeon Form using Javascript, passing in the VALUE (not position) of the required option.
For simple controls (text fields), from the documentation, I can do:
ORBEON.xforms.Document.setValue((ORBEON.jQuery('*[id $= "CONTROLID-control"]')).attr('id'), "NEWVALUE")
And also from the documentation, I can get the selected value of a dropdown using this:
ORBEON.xforms.Document.getValue(ORBEON.jQuery(ORBEON.jQuery('*[id $= "DROPDOWNID-control"]')[0]).find('.xforms-select1')[0])
Actually, that code retrieves the position in the dropdown of the selected value, e.g. "5". But anyway, I couldn't find a way to set the selected value of the dropdown using a VALUE and not a POSITION.
I built my Form using Form Builder and my dropdown is pre-populated using an Action and an HTTP Service. This is my populate action:
https://ibb.co/JsH635s
So I'd like to pass a NAME (value, NOT Position in dropdown) to the selector control to set it as a selected value.
Something like this:
ORBEON.xforms.Document.setValue((ORBEON.jQuery('*[id $= "local-branch-control"]')[0]), "MYVALUE")
I tried different combinations but none of them worked. Is this even possible in Orbeon?
Thanks

Figured it out, this is what I did:
myInitialValue = ORBEON.jQuery("select[id*='my-select-control'] option:contains(" + myInitialDisplayName + ")")[0].value;
ORBEON.xforms.Document.setValue(ORBEON.jQuery(ORBEON.jQuery('*[id $= "my-select-control"]')[0]).find('.xforms-select1')[0], myInitialValue);

Trying to add functionality to select option

In my program the user first enters some data to filter and the result goes to one dropdown select menu lets call this functionality function_1 . If there is only one result the it goes to make another query, lets call this function_2.
My problem here is when i have 2 or more results i should be able to:
1) check out the different options i get by clicking on the select to display all the options with a scrollbar if needed
2) After he saw the options there he clicks on one of them to activate function_2
The usual answers use the "change" event but, wont work if the user picks first default value because there is no change, he would have to pick an undesired result and go back to the first.
Using the click event on the select makes also unnecessary work because it triggers twice (one when i open the dropdown, other when option is selected)
Main problem here i think is the jquery selector, but im not sure if it can be done just with that.
This is an example of what im trying:
// function_1 in ajax
.done(result){
$.each(result.data,function (){
$('#select_ex').append("<option value...... ></option>");
if (result.count()===1){
$('#select_ex').trigger('change');
}
});
}
$('#select_ex option').change(function(){// tried with change, click or focus
function_2();
}
The html contains
<select name="select_ex" id="select_ex" size="0" ></select>
EDIT:
Not related to the duplicate question mentioned, since i already know why it doesnt select the option, besides it doesnt apply either since it only talks about connectors with ID, which is not even the point here (I could do my thing without IDs). Im asking for funcionality similar to ":selected" but with option->click.
Another workaround i thought of is filling the select with an empty/hidden field and set the selected property it, filtering afterwards and using the regular change event... but then the first item would be blank and doesn't seem very logic to me.
So I came to seek for any fresh ideas.
EDIT2
I added a white option for the multiple result and erased it afterwards by adding this line of code to imvain2 solution (where needed)
$("#select_ex option[value='0']").each(function() {$(this).remove();});

Although fixing your change function so that is is called for the select and not the option is important, your problem is the default selected option itself. As you mentioned, if they want the first option, they have to select something else to trigger the change function.
I would recommend adding a "blank" option as the first option and setting it as selected.
var $select_ex = $("#select_ex");
.done(result){
$select_ex.empty().append("<option value='0'>Select Your Ex Below!</option>");
$.each(result.data,function (){
$select_ex.append("<option value...... ></option>");
});
$select_ex.val("0");
}
$select_ex.change(function_2);

Preserve dynamically changed select values when back button clicked

I have a form which filters through different cars, and it's working perfect.
When a user selects a "Make" the correct sibling "Models" are populated into the next dropdown, so on and so forth.
The problem is that once a user has performed a search, if they click the browser's back button, the select values which are dynamically populated - are back to default!
I am not using ajax to dynamically populate the select fields, but only javascript where I am reading a JSON file and updating the models/series/etc like that.
I have looked at this post: Preserve dynamically changed HTML on back button
And I do not understand how this works, I have also heard about localstorage - what would be the best avenue for me to travel down? Thanks.

Using localStorage for this can be a bit unwieldy (when and how should I clear this value?) and there are security related considerations that may make it an infeasible solution.
Another option is to use a hidden textbox which makes use of the browser's default behaviour.
When a page is loaded after clicking the back button, browsers appear to populate textboxes based on the value contained in it when the user left the page (even if that value was dynamically changed). Note, this is different to how hidden inputs are handled, where dynamic changes are ignored, so you must use a textbox.
<select></select>
<input type="text" style="display:none" />
<script>
// store the dropdown's value in a hidden textbox which is persisted and
// used to populate the dropdown when the back button is used to get here
$('select').on('change', function() {
$('input').val($(this).val());
});
// example showing dynamic population of dropdown
$.ajax({
url: 'api/get-dropdown-options',
success: function(data) {
// dynamically populate the dropdown
$('select').html(data);
// update the dropdown's value based on the persistent value
// retained in the hidden textbox
$('select').val($('input').val());
}
});
</script>

Because the data is dynamically loaded, the browser will not be able to repopulate the previously selected entries when the user goes back to the previous page.
I suggest you make use of the browser's localStorage to store the latest selections and retrieve them when the user goes back. To accomplish that it's as simple as setting a new variable to the localStorage object and later retrieving it like so:
localStorage.make = "BMW";
alert(localStorage.make);
Also here's a more useful example:
select = document.getElementById("make");
if (localStorage.make) {
select.options[localStorage.make].selected = true;
}

jQuery Chosen plugin - first option doesn't trigger change event?

So I'm using the pretty nice jQuery plugin, Chosen; http://harvesthq.github.com/chosen/
What I'm doing is actually working with TWO Chosen style dropdowns in an 'either/or' fashion, ie the user needs to select an option from one OR the other.
So when the user selects one of the dropdowns, the other one (via javascript) gets set back to its default disabled value.
Both dropdowns are backed by ONE hidden parameter to actually hold the selected value, no matter which dropdown it came from. This is populated by having listeners on both dropdown's on the .chosen().change() event.
The only problem is, it doesn't appear to fire a "change" event when the user selects one of the first options in either dropdown, I guess as this appears to be the already selected option and is therefore not a "change". But both dropdowns actual first option (ie in the jsp) is a disabled option with the normal "Please select" text.
Is there a way to fire the change event even if the option selected was already selected? Or is there just a "select" event that fires even if there hasn't been a change?

you can use .trigger("change"), or .change() on your jquery object to manually trigger the change event.

This worked for me:
//Get the dynamic id given to your select by Chosen
var selId = $('your_select').attr('id');
//Use that id to remove the dynamically created div (the foe select box Chosen creates)
$('#'+ selId +'_chzn').remove();
//Change the value of your select, trigger the change event, remove the chzn-done class, and restart chosen for that select
$('#'+selId).val('your_new_value').change().removeClass('chzn-done').chosen();
In a nutshell you are hard reseting chosen for your select. There might be an easier way than this, but this worked for me.

I just had the same problem using Select2 plugin (remake of Chosen plugin).
I forgot the line "allowClear: true" when I 've declared the Combobox as a select2 one.
$('#selectLabelMap').select2({
placeholder: "Sélectionner un label",
allowClear: true // <= don't forget "allowClear: true (re-init the comboBox)
}

Trigger the change first time when (DOM) is ready.
jQuery(function ($) {
$('#myselect').trigger("change");
});

How to save data for previous selected value in a drop down list (before change) in jquery

It would be little complicated. Suppose I have a select list with items as status.I select a status and do some modification in the page, when I change to different status all the modificatiions which I did for previous selected status should be saved and send to a servlet. I was trying to do using change() , but it was taking current select field. and Also page relaods when status from the select is is changed thats y all the previous selected fields value also get lost.
Do anyone have ides of how to do it using jquery/Javascript as if I get the value I can pass to the servlet.
Basically I work on component based java using Apache Click framework. If some can relate with that too it would be great help too.

basically you need to store the previous value yourself and keep track of it, something like that:
var $selectElement = $("#selectElement");
$selectElement.change(function () {
var previousValue = $selectElement.data("previous");
//do something with previous value
$selectElement.data("previous",
$selectElement.find("option:selected").val);
}).change();
a quick example http://jsfiddle.net/dCkwd/

Try storing the values in a cookie with the jQuery $.cookie plugin and updating the cookie on change(). You can then access the latest cookie value.
I hope this helps!