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javascript enable and disable a combobox

I am a beginner in java-script , what I am doing right here is trying to make my combo-box named "dale" to enable and disable when i select "Reasons Specific Categorized" from my combo-box named "repSelect" but i keep getting an error on my java-script.
function makeEnable(value){
if(value=="rep4"){
var x=document.getElementById("dale")
x.disabled=false
}else{
var x=document.getElementById("dale")
x.disabled=true
}
}
</script>
</script>
<select onChange="makeEnable(value)" name="repSelect">
<option value="rep1">Employee</option>
<option value="rep2">Category Reasons Overall </option>
<option value="rep3">Department Overall </option>
<option value="rep4">Reasons Specific Categorized </option>
</select>
<select name="dale">
<option value="rep1">dale</option>
</select>
<input class="button" type="submit" value="Generar Reporte" >
</form>
My modification But dosent work
function makeEnable(){
var e = document.getElementById("repSelect");
var strUser = e.options[e.selectedIndex].value;
if(strUser=="rep4"){
document.getElementById("dale").disabled=false;
}else{
document.getElementById("dale").disabled=true;
}
}

You are using the .getElementById() method, but your element doesn't have an id defined. Add an id in the html:
<select id="dale" name="dale">
You may also need to modify the call to your function in the first select's onchange handler, to pass this.value instead of just value:
<select onChange="makeEnable(this.value)" name="repSelect">
You can also substantially simplify your function as follows:
function makeEnable(value){
document.getElementById("dale").disabled = value!="rep4";
}
Demo: http://jsfiddle.net/3t16p5p9/
EDIT: I just noticed that you had the jquery tag on your question. To use jQuery, remove the inline onChange= attribute and then add this to your script:
$(document).ready(function() {
$("select[name=repSelect]").change(function() {
$("#dale").prop("disabled", this.value!="rep4");
}).change();
});
This binds a change handler to the first select, and then calls it immediately so that the second one will be appropriately enabled or disabled when the page loads (as requested in a comment).
Demo: http://jsfiddle.net/3t16p5p9/2/

Actually you are using document.getElementById but your combobox doesn't have an Id.
Thats the reason its not working.
Instead of adding onchange in the html, use as below:
<select id='repselect' onchange=makeEnable() name="repSelect">
<option value="rep1">Employee</option>
<option value="rep2">Category Reasons Overall </option>
<option value="rep3">Department Overall </option>
<option value="rep4">Reasons Specific Categorized </option>
</select>
<select id="seldale" name="dale">
<option value="rep1">dale</option>
</select>
<input class="button" type="submit" value="Generar Reporte"/>
$('#repselect').change(function(){
if(this.value=="rep4"){
var x= document.getElementById("seldale")
x.disabled=false
}else{
var x =document.getElementById("seldale")
x.disabled=true
}
});

JavaScript - Dropdown does not work

I'm trying to achieve one simple requirement, but couldn't make it!
My requirement is very simple - wanna display some alert to the user based on the options he selects from the drop down.
Below is the code, I've designed now. Please check and correct me where I'm going wrong.
<SCRIPT type="text/javascript">
var txt = this.getField("ddPortfolio").value;
If(txt == "Distribution")
window.alert("distribution");
</SCRIPT>
<div style="float:right">
<select name = "ddPortfolio">
<option value="volvo">-- Select Option --</option>
<option value="saab">Training</option>
<option value="mercedes">Internal</option>
<option value="audi">External</option>
</select>
</div>

You have some syntax errors. Also there is no Distribution value in your options. I think you want this:
html
<div style="float:right">
<select name = "ddPortfolio" onchange="test(this);">
<option value="volvo">-- Select Option --</option>
<option value="saab">Training</option>
<option value="mercedes">Internal</option>
<option value="audi">External</option>
</select>
</div>
js
function test(obj){
var txt = obj.value;
if(txt == "audi"){
window.alert("audi");
}
}
fiddle

HTML
<select onchange="getval(this);">
<option value="1">One</option>
<option value="2">Two</option>
</select>
SCRIPT
<script type="text/javascript">
function getval(sel) {
alert(sel.value) ;
}
</script>
Simple Drop down box working using javascript.

You checked If(txt == "Distribution") but that was not one of the options in your select in the code you provided. also it's the onchange triegger you need
You also need to add an id to the select so you can reference it for example
HTML snippet
<select name = "ddPortfolio" id = "ddPortfolio">
Javscript
var MyColumn = document.getElementById("ddPortfolio");
MyColumn.onchange = function(){if (MyColumn.value == "audi") {alert('hi');}};
http://jsfiddle.net/64Z7H/

Add/Removing Options with JQuery

I'd like to add and remove options from one drop down menu using JQuery given a selected option in another.
HTML:
<form action='quickLook.py' method = 'post'>
First DropDown Menu
Specify Channel:
<select id='bolometer'>
<option selected id='Dual' value = 'Dual' >Dual
<option id='Top' value = 'Top' >Top
<option id='Bottom' value = 'Bottom' >Bottom
</select>
Second DropDown Menu
<br>Specify Data to Display:
<select id='target'>
<option selected id='Spectrum' value = 'Spectrum'>Spectrum
<option id='Interferogram' value = 'Interferogram'>Interferogram
<option id='SNR' value = 'SNR'>SNR
<option id='Diff_Band' value = 'Diff_Band'> Diff_Band
</select>
<input type='submit' value= 'Query Images'>
</form>
I'd like to do something like this is JQuery:
$("#Dual").click(function() {
$("#target").append("#Diff_Band");
$("#target").remove("#Interferogram");
$("#target").remove("#SNR");
});
$("#Top").click(function() {
$("#target").append("#Interferogram");
$("#target").append("#SNR");
$("#Diff_Band").remove();
});
I want to append or remove the already written html.
What is the best way to do this?
Thank you for your time!

This is a similar problem I've encountered before working with Safari. A solution is to use .detach() instead of remove() as it keeps all jQuery data associated with the removed elements. Check this jsfiddle: http://jsfiddle.net/Ueu62/

Remove value from option select

Have any chance to remove exp. value="1" option select?
Exp. that is my option select:
<select name="animals">
<option value="0">dog</option>
<option value="1">cat</option>
</select>
How to remove value="0" and value="1"?
I try this, that is my form:
<form method="post" action="/user/register/" onsubmit="test(this)">
<select name="animals" id="animals">
<option value="0">dog</option>
<option value="1">cat</option>
</select>
</form>
That is my test function:
function test(form) {
form["#animals"].removeAttr("value");
}
But have error message:
form['#animals'] is undefined

Using jQuery:
$('option').removeAttr("value");

Remove an option :
$("select option[value='0'], select option[value='1']").remove();

Try:
$('select[name="animals"] option[value="1"]').remove();

Two problems exist with your function
form["#animals"] is not the correct way to retrieve a element from a form.
Use form["animals"] - use the name directly with no css selector
form["animals"] is not a jQuery object so the removeAttr will fail.
Use $(form["animals"])
Instead just use $(form["animals"]).find('option').removeAttr('value')
Update:
//this will remove the attributes at load time
$(function() {
$('#animals option').find('option').removeAttr('value');
});

jQuery: Get value from multiple fields and show in text field

I have 6 different select boxes and a text field which I need to fetch the value from and combine in to one text field using jQuery.
I understand essentially I will build the value for the targetTextField with a string like this: $('#targetTextField').val(opt1+opt2+opt3+opt4+opt5+opt6+textField);
What do I use to fetch the value of select#options1 and transform that in to opt1?
Would it be along the lines of opt1 = $('select#options1').val(); or am I heading in completely the wrong direction?
I've created a basic jsfiddle with just two options at:
http://jsfiddle.net/e2ScF/2/
jQuery
$(function() {
$("#options").change(function(){
var opt1 = $('select#options').val()
}$('#targetTextField').val(opt1+opt2);
});
$("#options2").change(function(){
var opt2 = $('select#options2').val()
}$('#targetTextField').val(opt1+opt2);
});
});​
HTML
<select id="options">
<option value="" selected>Choose...</option>
<option value="opt1Value1" >Option 1</option>
<option value="opt1Value2" >Option 2</option>
</select>
<select id="options2">
<option value="" selected>Choose...</option>
<option value="opt2Value1" >Option 1</option>
<option value="opt2Value2" >Option 2</option>
</select>
<input type="text" id="targetTextField" name="targetTextField" size="31" tabindex="0" maxlength="99">​
...but it doesn't appear to be working, so I've obviously misunderstood or missed something.

I made this demo for you, hope it helps
http://jsfiddle.net/e2ScF/5/
$(function() {
$("#options").change(function(){
setTarget() ; // Something has changed so lets rebuild the target
});
$("#options2").change(function(){
setTarget();// Something has changed so lets rebuild the target
});
});
// Just get the values you want and update the target
function setTarget(){
var tmp = $("#options").val();
tmp += $("#options2").val();
$('#targetTextField').val(tmp);
}
​

for dropdown try following
$('select option:selected').text()

have a look at this it should hopefully give you a pointer in what you need to do.
you can change the name to be a class and then just provide your format you want to display in the input. but from your question in presume it should be about that.

If you have different id for select box
var toalopt=$('select option1:selected').text();
toalopt+=$('select option2:selected').text();
toalopt+=$('select option3:selected').text();
toalopt+=$('select option4:selected').text();
toalopt+=$('select option5:selected').text();
toalopt+=$('select option6:selected').text();
document.getElementById('id where you want to club data').innerHTML=toalopt;
If you have same id
$(document).ready(function(){
$('#optionvalue).click(function(){
var values ='';
$('select[name="sameid"]').each(function(index,item){
values +=$(item).val() +' ';
});
$('id where you want to club data').val(values);
});
});
HTml will be normal select tag with id.

First of all, add a class to each of your select elements to better identify them as a group:
<select id="options" class="auto-updater">
<option value="" selected>Choose...</option>
<option value="opt1Value1" >Option 1</option>
<option value="opt1Value2" >Option 2</option>
</select>
<select id="options2" class="auto-updater">
<option value="" selected>Choose...</option>
<option value="opt2Value1" >Option 1</option>
<option value="opt2Value2" >Option 2</option>
</select>
<input type="text" id="targetTextField" name="targetTextField" size="31" tabindex="0" maxlength="99">
Then in jQuery, you can use map() to create an array of the values and display them:
$(".auto-updater").change(function() {
var values = $(".auto-updater").map(function() {
return ($(this).val() == "") ? null : $(this).val(); // ignore default option select
// return $(this).val(); // include all values
}).get();
$("#targetTextField").val(values.join(','));
});
Example fiddle
You can see that I've set this up to ignore select elements which are left on their default value. If you uncomment the line beneath it will include all selects, regardless of value chosen.

Minimal code required for you as below:
$(function() {
$("select").change(function(){
var opts=$('option:selected').val();
var oldVal=$('#targetTextField').val();
$('#targetTextField').val(oldVal+opts);
});
});​
Find the jsfiddle demo here.