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Disable or hide select option if keyword is present in other element

Using jQuery, I want to hide or disable a select option if a keyword is present in an element higher up the page. Here's some example HTML:
<div>
<div id="divID">The word EXAMPLE is in this sentence.</div>
<select id="optionList" name="optionList">
<option value="">Select Option</option>
<option value="1">First option</option>
<option value="2">Second option</option>
<option value="3">Third option</option>
</select>
</div>
So the psuedo-code would go something like this:
IF the word "example" is present in the div with ID "divID"...
THEN make select option "Third Option" hidden (or inactive, or otherwise not an option for the user).
OTHERWISE leave all the select options alone.
I imagine this is pretty basic stuff for anyone who knows what they're doing, which I clearly do not.
Thanks in advance for any help!

Using jquery plus regular expressions, following should be a basic sample:
$(document).ready(function() {
if (/EXAMPLE/.test($('#divID').text()))
$('option[value="3"]').hide();
});

check this js fiddle
https://jsfiddle.net/pe1yvucj/
notice this line
$("option[value='3']").attr('disabled','disabled')
to make it enabled again
$("option[value='3']").removeAttr('disabled')

What is the best practice to scale a select/dropdown

I have a long list (of an undetermined length, that can keep on growing) of values. For example:
<select>
<option value="1">1, some test</option>
<option value="2">2, some text</option>
<option value="3">3, some text</option>
<option value="4">4, some text</option>
<option ...... add 100 more options> ..
</select>
What would be the best practice/user friendly way to support such a long list? I imagine that a user might find it frustrating to scroll through a super long list.
I am trying to minimize the user's scroll time, by presenting the most recent values at the top of the drop down, but if she/he would like to go to the first element in the drop down it would require a lot of scrolling.
Thanks

Instead of using <select>, how about changing it to HTML5 <datalist>, which is like this:
<datalist id="browsers">
<option value="Internet Explorer">
<option value="Firefox">
<option value="Chrome">
<option value="Opera">
<option value="Safari">
</datalist>
By the way, you can type the first letter using the <select>, so my suggestion will be sort your data according to the first letter. Because it will help the user to go to the sub-option directly.

Maybe add a searchfield to the dropdown?
Something like this: http://jsearchdropdown.sourceforge.net/

What kind of data would you like to display ? Maybe there is another way than select to display them ? In fact, for dozens of items, select is not the best choice, unless you use by example a JQuery plugin like jsearchdropdown and in this case the user must know what he's looking for.

Including images in select dropdown

I would like this dropdown select to show an image with an alt text in front of the options, how can I do this?
<form>
<select onchange="window.open(this.options[this.selectedIndex].value,'_blank')">
<option value="#">Select one</option>
<option value="#"></option>
<option value="http://www.url1.com">www.url1.com</option>
<option value="http://www.url2.com">www.url2.com</option>
<option value="www.url3.com">www.url3.com</option>
</select>
</form>
Thanks a lot!

It is not possible to show images in an html <select> - you would have to use a custom solution like this one: http://ivaynberg.github.io/select2/

That is not a button!, it a select dropdown.
You should use ddSlick which is a free light weight jQuery plugin that allows you to create a custom drop down with images and description.
I hope this helps

DOM model doesn't allow img elements inside option elements, so you cannot put image into a select. Please have a look at an HTML language reference. But you can use JavaScript or jQuery to put an image at the left or right of the menu whenever a new option is selected.
However, in Firefox you can just add background image to option:
<select>
<option style="background-image:url(image1.png);">OPTION1</option>
<option style="background-image:url(image2.png);">OPTION2</option>
<option style="background-image:url(image3.png);">OPTION3</option>
</select>
And in other browsers the only way of doing that would be using some JS widget library, like for example jQuery UI Selectable.
olsn's link is also a good example.

how to use a different value from that selected in a drop down

I'm trying to figure out how (if possible, which I'm sure I can) to use a different value to that selected in a drop down box in HTML. Happy to use jQuery or JavaScript. So for example I have a series of dropdowns as follows:
<select id="country" title="Country">
<option>Argentina ARG</option>
<option>Australia AUS</option>
<option>Austria AUT</option>
<option>Austria AUT</option>
<option>Belgium BEL</option>
<option>Brazil BRA</option>
<option>Canada CAN</option>
</select>
Naturally when a user chooses say 'Brazil' the option displays 'Brazil BRA'. However, I would like to instead use the value 'BRA' is it possible to do this? Am I just being dumb and it can be done in plain HTML?

<option value="BRA">Brazil BRA</option>
Side note: I believe IE6 needs that value or things get funky onsubmit.

Use the value attribute: http://www.w3schools.com/tags/att_option_value.asp

<select id="country" title="Country">
<option value="ARG">Argentina</option>
<option value="AUS">Australia</option>
</select>

You can use the options value-attribute. This way the text that is shown to the user is Argentina ARG, but the value that is posted with the form is just ARG.
<select id="country" title="Country">
<option value="ARG">Argentina ARG</option>
<option value="AUS">Australia AUS</option>
...
</select>

dynamic dropdown list ( select boxes )

Here is the issue.
I have a select dropdown list.
<select name="listingtype" id="speedD" style="width:210px;">
<option>For Sale</option>
<option>For Rent</option>
</select>
And another select drop down list where the prices appear , which on page load it is empty..
So if user clicks For Sale: then the other select drop down list, loads price list like so:
<select name="valueA" id="speedF" style="width:200px;">
<option value="Any" selected="selected">Any</option>
<option value="50000">$50,000</option>
<option value="100000">$100,000</option>
<option value="150000">$150,000</option>
<option value="200000">$200,000</option>
<option value="250000">$250,000</option>
And if they choose For Rent. Select drop down is propagated like so:
<select name="valueA" id="speedF" style="width:200px;">
<option value="Any" selected="selected">Any</option>
<option value="100">$100</option>
<option value="150">$150</option>
<option value="200">$200</option>
<option value="250">$250</option>
<option value="300">$300</option>
</select>
I need this code to be client side, no need for server side. And just wanted to know what the cleanest method for doing this is.
Cheers.

First of all I recommend setting the value attribute in your option elements.
Example:
<option value="sale">For sale</option>
<option value="rent">For rent</option>
If you have not already heard of or seen the JavaScript library known as jQuery I strongly recommend checking it out! It can be very helpful when creating a dynamic site like this using minimal JavaScript.
I would do something like the following:
<html>
...
<body>
<div id="fillme"></div>
<script type="text/javascript">
if (document.yourformname.listingtype.value == "sale") {
//it is for sale
$('#fillme').html('<select name="valueA" id="speedF" style="width:200px;"><option value="Any" selected="selected">Any</option><option value="50000">$50,000</option><option value="100000">$100,000</option><option value="150000">$150,000</option><option value="200000">$200,000</option><option value="250000">$250,000</option></select>');
} else {
//fill it with the other elements
}
</script>
</body>
</html>
Now of course you could load it more dynamically with JSON or XML but that is up to you. I really recommend checking out the library:
http://jQuery.com

Use JavaScript to fill the empty select with options when the user selects an option (either onchange or onselect, forget which) in the For Sale/For Rent select.
EDIT: More specifically, have that second box be empty when the page loads. Store the options in arrays. Use a loop to create new OPTION elements based on each array item.