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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: Change select box value and and activate a click state

So whats going on is that I have a site that I have taken on for my work. I have two select boxes I am tying into. The problem is when you click the second select box and choose an option it uses ajax to load a second box next to it (a hierarchical select box). The code that I am using is simple and changes the value of the second box back to the "select" option state when the first box is changed. But what it is not doing is creating click state (sorry if I am saying that wrong) but in order for ajax to bring in and remove the third select box the second select box option needs to be clicked.
Is there a way for me to re-create a "click" of the select box.
Here is the jquery:
$(".state.form-select").change(function() {
$('.hierarchical-select .form-select').val('select');
});
Here is a sample fiddle. See this Fiddle

I am not entirely sure, what exactly you are looking for but I feel that this should do the trick:
https://jsfiddle.net/vuvckm3u/5/
$(".state.form-select").change(function() {
$('.hierarchical-select .form-select option:first-child').attr('selected', true);
});

How can I show a hidden DIV for a selection included with others?

I have a javascript file that when called, checks to see if a particular option is selected on a form. The form allows for multiple selections before being submitted. When a particular item is selected within the given choices it shows a hidden menu. In this case with "audits" I am able to show the hidden menu fine when just "audits" is selected from the list. However, I'm having much difficulty in figuring out how to get the menu to show when "audits" would be selected/highlighted with others. Eg: I had audits, services, someotheroption
Below you can see the code I'm currently using and that's working only when the single item is selected. Any guidance would be much appreciated.
function toggleFields(){
function toggleFields(){
if ($("#installations").val() == "audits"){
$("#dbcredentialsfield").show();
}
else
$("#dbcredentialsfield").hide();
}

Using the code you have so far, I assume you probably want something like this:
$('#installations').on('change', function(){
$("#dbcredentialsfield").toggle($(this).val() == 'audits');
});
This says; when the select element (assuming your dropdown has the id of installations) changes, toggle the visibility of the element with id dbcredentialsfield depending on if the value of the select is audits or not.

Change events on dynamically added selects using the Chosen plugin

I'm using the Chosen plugin on my site, and so far it has been working perfectly. However, I'm in a situation where I added a select dynamically and activated the Chosen plugin on those selects. These Chosen selects are being produced fine, but I cannot figure out how to bind a click event to the element. Chosen offers this( $("#form_field").chosen().change( … );) as a way to do something on the change event, however, this does not work since my select was added dynamically.
I have tried $('#el').change and $(document).on("change", "#el", function()) as well without any success.

Original Answer:
From http://harvesthq.github.io/chosen/#change-update-events
"If you need to update the options in your select field and want Chosen to pick up the changes, you'll need to trigger the "chosen:updated" event on the field. Chosen will re-build itself based on the updated content."
$("#form_field").trigger("chosen:updated");
...so just call that after you add the new element.
Edit:
After reviewing this http://jsfiddle.net/amindunited/reh5p0tg/3/
I can see that the issue was that the change() listener for the second select was being attached before that select was added to the page.
I have updated the fiddle code to work:
http://jsfiddle.net/amindunited/reh5p0tg/4/

EDIT
Another way to make it work is to stuff everything inside an init function:
function init_new_content(){
$("#form_field").chosen();
}
init_new_content();
And then call it whenever you know you made a change (for example on ajax)
$.ajax({...},
success: function( data){
init_new_content();
},
...

How to change dropdown list label text on click?

I have a <select> element in my HTML that is bound via ng-model to an object in the scope.
Initially I want the dropdown to read "Group..." but when the user clicks on the control I want "Group..." to be renamed to "All" so that "Group..." can never be selected, in the same sense that sites use text boxes with default text that gives you a hint to what the form is for and disappears when it gets user focus (e.g. A "Search..." field).
Here is my JSFiddle example which isn't working as I expected: http://jsfiddle.net/TXPJZ/561/
I figured that ng-onclick="myOptions[0].label = 'All'" would work, it should change the value of the data structure that populates the dropdown and thus change the dropdown options but it doesn't.
How do I make this work like I want?

ng-click is the directive you want, not ng-onclick. Using that it seems to work the way you want it to:
http://jsfiddle.net/TXPJZ/562/