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Remove Selected Value in Dropdown List Using JavaScript

I have an HTML list that I want to remove elements from as the user chooses. I've tried using this code from this thread but my issue seems to be accessing the element.
Here's my HTML:
<div id="ShipPlacement">
Ship:
<select name="shipSelec" id="shipSelec">
<option value="aircraftCarrier">Aircraft Carrier</option>
<option value="battleship">Battleship</option>
<option value="cruiser">Cruiser</option>
<option value="destroyer">Destroyer</option>
<option value="destroyer">Destroyer</option>
<option value="submarine">Submarine</option>
<option value="submarine">Submarine</option>
</select>
<button type="button" onclick="placeShip()">Remove Selected Ship</button>
And here's my JavaScript:
$( document ).ready(function() {
var shipList=document.getElementById('shipSelec');
});
function placeShip() {
shipList.remove(shipList.options[shipList.selectedIndex].value;);
shipList.remove(shipList.options[shipList.selectedIndex]);
shipList.remove(shipList.options[selectedIndex]);
shiplist.remove([shipList.selectedIndex])
}
I have several instances of the remove() method but that none of them work.
However, the best way I can convey my error to you is through JSFiddle.

As you've jQuery loaded on the page, use it to bind events and remove element from DOM.
First, bind click event on the button using click. Use the :selected pseudo-selector to select the selected option from the dropdown and remove() to remove it from DOM.
$('button').click(function() {
$('#shipSelec option:selected').remove();
});
$(document).ready(function() {
$('button').click(function() {
$('#shipSelec option:selected').remove();
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="ShipPlacement">
Ship:
<select name="shipSelec" id="shipSelec">
<option value="aircraftCarrier">Aircraft Carrier</option>
<option value="battleship">Battleship</option>
<option value="cruiser">Cruiser</option>
<option value="destroyer">Destroyer</option>
<option value="destroyer">Destroyer</option>
<option value="submarine">Submarine</option>
<option value="submarine">Submarine</option>
</select>
<button type="button">Remove Selected Ship</button>
</div>
Updated Fiddle
Note that there are several issues in your code
In fiddle "LOAD TYPE" option should be selected to "No Wrap".
jQuery is not included. This can be included using the "Frameworks & Extensions" option in the JavaScript tab
Syntax error in the first statement in the placeShip() near .value;);
shipList is local to the ready callback and hence not accessible from outside of it. Not even in placeShip()
With pure JavaScript
var shipList = document.getElementById('shipSelec');
shipList.options[shipList.selectedIndex].remove();
Fiddle

$("#btn").click(function() {
$("#shipSelec option:disabled").prop("disabled", false)
$("#shipSelec option:selected").prop("disabled", true)
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="ShipPlacement">
Ship:
<select name="shipSelec" id="shipSelec">
<option value="aircraftCarrier">Aircraft Carrier</option>
<option value="battleship">Battleship</option>
<option value="cruiser">Cruiser</option>
<option value="destroyer">Destroyer</option>
<option value="destroyer">Destroyer</option>
<option value="submarine">Submarine</option>
<option value="submarine">Submarine</option>
</select>
<button type="button" id="btn">Remove Selected Ship</button>
I suggest just disable the option not remove

JQuery always returning first option when looking for selected item in select element

I have the following select:
<select class="my-select">
<option value="-1">All</option>
<option value="7">Red</option>
<option value="8">Green</option>
<option value="9">Blue</option>
</select>
I then have a function that runs to see what the selected option is in the select:
function getSelectedOption () {
var selection = $('.my-select').val();
console.log(selection);
}
This is where it gets weird, I can run that function when 'Red', 'Green' and 'Blue' is selected and it'll always return me the correct value. But when I select 'All', the correct value is returned (-1), but when I go back and select 'Red' or any other option after that, the returned value is always (-1). Suggesting that 'All' is selected. When it's not. I also inspected the DOM to see, and in the case where 'Red' was selected, the DOM looks like:
<select class="my-select">
<option value="-1">All</option>
<option value="7" selected="selected">Red</option>
<option value="8">Green</option>
<option value="9">Blue</option>
</select>
But $('.my-select').val() is returning me the wrong value.

Try this:
$('.my-select').find('option:selected').val()
and it should not be <option val="7"></option>, instead it should look like this:
<option value="7"></option>

Seems to work as it should, what browser are you using?
var $select = $('select');
$select.on('change', function (event) {
console.log($(event.target).val());
});
$select.trigger('change');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select class="my-select">
<option value="-1">All</option>
<option value="7">Red</option>
<option value="8" selected>Green</option>
<option value="9">Blue</option>
</select>

You have used wrong attribute in option is val, correct attribute is value for assign different value then text/label
function getSelectedOption () {
var selection = $('.my-select').val();
console.log(selection);
}
$(".my-select").change(getSelectedOption);
getSelectedOption();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<select class="my-select">
<option value="-1">All</option>
<option value="7" selected="selected" >Red</option>
<option value="8">Green</option>
<option value="9">Blue</option>
</select>

Select has an empty value

I`ve a "select":
<select class="date-select2" name="date">
<option selected="selected" value="">All</option>
<option value="11-2015">11-2015</option>
<option value="10-2015">10-2015</option>
<option value="09-2015">09-2015</option>
<option value="07-2015">07-2015</option>
<option value="06-2015">06-2015</option>
<option value="04-2015">04-2015</option>
<option value="03-2015">03-2015</option>
</select>
When I`m try to get value of select,
document.getElementsByClassName('date-select2')[0].value
it normally returns a value of selected item in Chrome. In FF and Safari sometimes it returns an empty string, when selected a numeric value(not "All").
How to deal with it?

I think this might help you:
HTML
<select class="date-select2" name="date" onchange="myFunction(this.value)">
<option selected="selected" value="">All</option>
<option value="11-2015">11-2015</option>
<option value="10-2015">10-2015</option>
<option value="09-2015">09-2015</option>
<option value="07-2015">07-2015</option>
<option value="06-2015">06-2015</option>
<option value="04-2015">04-2015</option>
<option value="03-2015">03-2015</option>
</select>
JavaScript
function myFunction(curValue) {
alert(curValue);
}
Working : Fiddle
Note: Also remember to put your JavaScript code inside body also right before it ends.

var select = document.querySelector('select.date-select2');
// add onchange handler
select.onchange = function(){
var idx = select.selectedIndex;
var val = select.options[idx].value;
// if All is selected use text of option
if(val=="")
val = select.options[idx].textContent;
};

You can try this way to get selected item:
$(".date-select2 option:selected").text();

Get DropDown value using its name in JQuery

I have these SELECTs in my page
<select id="select_status_id44" name="select_status_id[44]" class="inputbox" id = "status_id_44">
<option value="1">Pending</option>
<option value="2" selected="selected">Confirmed</option>
<option value="3">Cancelled</option>
<option value="4">Refunded</option>
<option value="5">Shipped</option>
<option value="6">Paid</option>
<option value="7">Complete</option>
</select>
And also this one
<select id="select_status_id78" name="select_status_id[78]" class="inputbox" id = "status_id_44">
<option value="1">Pending</option>
<option value="2" selected="selected">Confirmed</option>
<option value="3">Cancelled</option>
<option value="4">Refunded</option>
<option value="5">Shipped</option>
<option value="6">Paid</option>
<option value="7">Complete</option>
</select>
I want to do is that whenever any of these two SELECT is CHANGED, it shoul dget the select_status_id[ID] ID inside that tag...
For now I have simply done this but it does not work
$('select[name=select_status_id]').change(function() {
alert('dsada');
});
I know that I should not get using ID attribute because they are different for both ... but NAME attribute is same

Try this way
$('select[name^="select_status_id"]').change(function() {
alert($(this).attr('name').split('[')[1].replace(']',''));
});
DEMO

You can try this on change for each select.
$("#select_status_id44").change(function(){
var val = "select_status_id["+$(this).val()+"]";
$(this).prop("name", val);
console.log(val);
});
UPDATE: Check this Fiddle : http://jsfiddle.net/JayKandari/L8TWN/1

if you can add a data-property to your select
<select data-id-value="42" ..... >
$('select').on('change', function() {
console.log ( $(this).data('id-value') );
});

HTML setting default text on select

I have a select element of the form:
<select id="test" name="test">
<option value="blah">Test1</option>
<option value="blah">Test2</option>
.
<option value="blah">Testn</option>
</select>
I want to display the text "Select a test" as default.
I know the way of doing this is to set a new option
<option selected="selected">Select a test</option>
at the top. But I'm looking for some other way where I don't have to use the tag.
Is it possible through javascript (jQuery will also do)?

I've done this with a dummy entry in the past...
HTML
<select id="test" name="test">
<option value="0">Select an option...</option>
<option value="blah">Test1</option>
<option value="blah">Test2</option>
<option value="blah">Test3</option>
<option value="blah">Test4</option>
<option value="blah">Test5</option>
</select>​
Javascript
​$("#test").on("change", function() {
if ($(this).val() != "0") {
$("option[value=0]", this).remove();
}
});​​​​​​
Here's a working example on jsFiddle...
http://jsfiddle.net/97Bqr/
The "Select an option" option is removed as soon as you select something else.

Here's a plain js solution:
var selecttest = document.querySelector('#test');
selecttest.insertBefore(new Option('select a test'),selecttest.firstChild);
selecttest.selectedIndex = 0;