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Selecting item from a dropdown with javascript

Here is a dropdown menu of a website
<select name="ctl00$ddlWersjeJezykowe" onchange="javascript:setTimeout('__doPostBack(\'ctl00$ddlWersjeJezykowe\',\'\')', 0)" id="ddlWersjeJezykowe" style="width:100px;margin-right: 10px;">
<option selected="selected" value="1">Polska</option>
<option value="2">English</option>
<option value="17">Русская</option>
<option value="19">Українська</option>
<option value="20">Deutsch</option>
<option value="21">Français</option>
<option value="22">Español</option>
<option value="24">Português</option>
<option value="25">Türk</option>
</select>
I want to change the language to English through browser console. I tried this on my console
document.getElementById("ddlWersjeJezykowe").value="2";
It only selects English but doesn't change the language. How can i change the language to English through my browser console?

Changing the value programmatically doesn't fire the onchange event, so you have to call setTimeout('__doPostBack(\'ctl00$ddlWersjeJezykowe\',\'\')', 0) too.
Alternatively, you can call document.getElementById("ddlWersjeJezykowe").onchange()

This is will get the selected value from select dropdown
<select id="language" style="width:100px;margin-right: 10px;">
<option selected="selected" value="1">Polska</option>
<option value="2">English</option>
<option value="17">Русская</option>
<option value="19">Українська</option>
<option value="20">Deutsch</option>
<option value="21">Français</option>
<option value="22">Español</option>
<option value="24">Português</option>
<option value="25">Türk</option>
</select>
function GetValue() {
var e = document.getElementById("language");
var result = e.options[e.selectedIndex].value;
document.getElementById("result").innerHTML = result;
}
<button type="button" onclick="GetValue()">Get Selected Value</button>
<div id="result"></div>

Drop down changes automatically ( vise versa would be best )

I need to change the 3rd field automatically depending on first two field. ( it would be best if I change 3rd field and then first 2 fields changes also )
I need a Jquery solution. Anyone can help me please?
<select id="First">
<option val="car">car</option>
<option val="phone">phone</option>
</select>
<select id="Second">
<option val="car">car</option>
<option val="phone">phone</option>
<option val="boll">boll</option>
</select>
<hr>
<select id="ChangeItAutomatically">
<option val="carcar">car car</option>
<option val="carphone">car phone</option>
<option val="carboll">car boll</option>
<option val="phonecar">phone car</option>
<option val="phonephone">phone phone</option>
<option val="phonecarboll">phone boll</option>
</select>

Is this what you're looking for?
$(document).ready(function() {
// on change for the 3rd select
$("#ChangeItAutomatically").on("change", function() {
// get the value and split on space
var value = $(this).val().split(" ");
// select the other two selects based on the values
$("#First").val(value[0]);
$("#Second").val(value[1]);
});
// on change for the first two selects
$("#First, #Second").on("change", function() {
// set the value of the 3rd select based on the combination of values of the first two
$("#ChangeItAutomatically").val($("#First").val() + " " + $("#Second").val());
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="First">
<option val="car">car</option>
<option val="phone">phone</option>
</select>
<select id="Second">
<option val="car">car</option>
<option val="phone">phone</option>
<option val="boll">boll</option>
</select>
<hr>
<select id="ChangeItAutomatically">
<option val="car car">car car</option>
<option val="car phone">car phone</option>
<option val="car boll">car boll</option>
<option val="phone car">phone car</option>
<option val="phone phone">phone phone</option>
<option val="phone boll">phone boll</option>
</select>

Select on Change will change another select html javascript or jquery

I have a select like this
<select name="category" >
<option value="0" selected>Select a Manufacturer</option>
<option value="10">Acer Technologies</option>
<option value="2">Alcatel</option>
<option value="14">Apple Iphone</option>
<option value="4">Azumi</option>
<option value="12">HTC Corporation</option>
<option value="8">Huawei</option>
<option value="5">LG Electronics</option>
<option value="11">Motorola</option>
<option value="9">Nokia Microsoft</option>
<option value="1">Samsung</option>
<option value="6">Sony Ericsson</option>
<option value="3">Zhong Xing ZTE</option>
</select>
And another select HIDDEN like this
<select name="manufacturer" >
<option value="none" selected>Select a Manufacturer</option>
<option value="Acer Technologies">Acer Technologies</option>
<option value="Alcatel">Alcatel</option>
<option value="Apple Iphone">Apple Iphone</option>
<option value="Azumi">Azumi</option>
<option value="HTC Corporation">HTC Corporation</option>
<option value="Huawei">Huawei</option>
<option value="LG Electronics">LG Electronics</option>
<option value="Motorola">Motorola</option>
<option value="Nokia Microsoft">Nokia Microsoft</option>
<option value="Samsung">Samsung</option>
<option value="Sony Ericsson">Sony Ericsson</option>
<option value="Zhong Xing ZTE">Zhong Xing ZTE</option>
</select>
Both selects are almost the same value, the first one is to save the manufacturer as category and the second one is to save the manufacturers name
The first one is visible while the second one is hidden ( display:none )
What I need is:
If the user select in select one for example
<option value="2">Alcatel</option>
In some way the hidden display:none select must be autoselected to
<option value="Alcatel">Alcatel</option>
Any way to do this?
I already have Jquery running other functions on the site
Thanks

Use change function:
$( "select[name='category']" ).change(function(e) {
$( "select[name='manufacturer']" ).val( $(this).find( "option:selected" ).text() );
});
But if option text in category select do not match option value in manufacturer select - code will not work.

How can I move a select element's values & text to another select element

I want to get the <option> values and text from a <select> element #myselect, and add it to another <select> element #newselect. The value and text passed to the second select element, #newselect, must also be disabled. I'd like support for IE 8+.
<select id="myselect">
<option value="1">Red</option>
<option value="2">Orange</option>
<option value="3">Yellow</option>
</select>
Take the above, disable them and add them to the below:
<select id="newselect">
<option value="1">Green</option>
<option value="2">Blue</option>
<option disabled value="1">Red</option>
<option disabled value="2">Orange</option>
<option disabled value="3">Yellow</option>
</select>

Since you included the jQuery tag, here's a jQuery solution.
As long as you're using jQuery 1.x, IE8 support is included.
$('#myselect option').each(
function() {
$(this).prop('disabled', true).appendTo('#newselect');
}
);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<select id="myselect">
<option value="1">Red</option>
<option value="2">Orange</option>
<option value="3">Yellow</option>
</select>
<select id="newselect">
<option value="1">Green</option>
<option value="2">Blue</option>
</select>

You already have jQuery answer. So now if you are curious how it can be in pure javascript, here it is. As you can see, it's a little more verbose of course:
var mySelect = document.getElementById('myselect'),
newSelect = document.getElementById('newselect');
while (mySelect.options.length) {
mySelect.options[0].disabled = true;
newSelect.add(mySelect.options[0]);
}
<select id="myselect">
<option value="1">Red</option>
<option value="2">Orange</option>
<option value="3">Yellow</option>
</select>
<select id="newselect">
<option value="1">Green</option>
<option value="2">Blue</option>
</select>

How can I check if Dynamically created Select Boxes have been selected

I have some code that has one contact select box hard coded and then if you click on a add button it adds more contacts. Each contact can be selected from a dropdown and give a location in at location text box.
I want on submit to be able to know if they have selected someone and if not I want to clear out the Location box as there cannot be a location if there is no contact.
<!--- The myContactCount variable is set in another part of javascript this is the current count plus one of the number of current select boxes. --->
<script type="text/javascript" language="javascript">
var e='';
var contactSelectedValue='';
for(var i=1;1<myContactCount;i++){
e = document.getElementById('myContactID_'+i);
contactSelectedValue = e.options[e.selectedIndex].value;
/* I am trying to alert the value so I can then use a if statement to check for null or even change the 'Select a Contact' value to 0 and test for that. */
alert(contactSelectedValue);
}
</script>
<!--- the ID will be 1-100 depending on how many contacts they have added --->
<select name="myContactID_#ID#">
<option value="">Select a Contact</option>
<option value="1">Abe</option>
<option value="2">Barbara</option>
<option value="3">Cavlin</option>
</select>
So after they are created dynamically they code would look like this.
<select name="myContactID_1">
<option value="">Select a Contact</option>
<option value="1">Abe</option>
<option value="2">Barbara</option>
<option value="3" selected="selected">Cavlin</option>
</select>
<select name="myContactID_2">
<option value="">Select a Contact</option>
<option value="1">Abe</option>
<option value="2" selected="selected">Barbara</option>
<option value="3">Cavlin</option>
</select>
<select name="myContactID_3">
<option value="">Select a Contact</option>
<option value="1" selected="selected">Abe</option>
<option value="2">Barbara</option>
<option value="3">Cavlin</option>
</select>

Your script has couple of issues:-
1<myContactCount instead of i<=myContactCount and you are using name in the select and
trying to fetch it by id.
Demo
Html
<select id="myContactID_1">
<option value="">Select a Contact</option>
<option value="1">Abe</option>
<option value="2">Barbara</option>
<option value="3" selected="selected">Cavlin</option>
</select>
<select id="myContactID_2">
<option value="">Select a Contact</option>
<option value="1">Abe</option>
<option value="2" selected="selected">Barbara</option>
<option value="3">Cavlin</option>
</select>
<select id="myContactID_3">
<option value="">Select a Contact</option>
<option value="1" selected="selected">Abe</option>
<option value="2">Barbara</option>
<option value="3">Cavlin</option>
</select>
JS
var e='';
var contactSelectedValue='';
for(var i=1;i<=3;i++){
e = document.getElementById('myContactID_'+i);
contactSelectedValue = e.options[e.selectedIndex].value;
/* I am trying to alert the value so I can then use a if statement to check for null or even change the 'Select a Contact' value to 0 and test for that. */
alert(contactSelectedValue);
}