I have a drop-down list with known values. What I'm trying to do is set the drop down list to a particular value that I know exists using jQuery.
Using regular JavaScript, I would do something like:
ddl = document.getElementById("ID of element goes here");
ddl.value = 2; // 2 being the value I want to set it too.
However, I need to do this with jQuery, because I'm using a CSS class for my selector (stupid ASP.NET client ids...).
Here are a few things I've tried:
$("._statusDDL").val(2); // Doesn't find 2 as a value.
$("._statusDDL").children("option").val(2) // Also failed.
How can I do it with jQuery?
Update
So as it turns out, I had it right the first time with:
$("._statusDDL").val(2);
When I put an alert just above it works fine, but when I remove the alert and let it run at full speed, I get the error
Could not set the selected property. Invalid Index
I'm not sure if it's a bug with jQuery or Internet Explorer 6 (I'm guessing Internet Explorer 6), but it's terribly annoying.
jQuery's documentation states:
[jQuery.val] checks, or selects, all the radio buttons, checkboxes, and select options that match the set of values.
This behavior is in jQuery versions 1.2 and above.
You most likely want this:
$("._statusDDL").val('2');
Add .change() to see the option in the dropdown list frontend:
$("._statusDDL").val('2').change();
With hidden field you need to use like this:
$("._statusDDL").val(2);
$("._statusDDL").change();
or
$("._statusDDL").val(2).change();
These solutions seem to assume that each item in your drop down lists has a val() value relating to their position in the drop down list.
Things are a little more complicated if this isn't the case.
To read the selected index of a drop down list, you would use this:
$("#dropDownList").prop("selectedIndex");
To set the selected index of a drop down list, you would use this:
$("#dropDownList").prop("selectedIndex", 1);
Note that the prop() feature requires JQuery v1.6 or later.
Let's see how you would use these two functions.
Supposing you had a drop down list of month names.
<select id="listOfMonths">
<option id="JAN">January</option>
<option id="FEB">February</option>
<option id="MAR">March</option>
</select>
You could add a "Previous Month" and "Next Month" button, which looks at the currently selected drop down list item, and changes it to the previous/next month:
<button id="btnPrevMonth" title="Prev" onclick="btnPrevMonth_Click();return false;" />
<button id="btnNextMonth" title="Next" onclick="btnNextMonth_Click();return false;" />
And here's the JavaScript which these buttons would run:
function btnPrevMonth_Click() {
var selectedIndex = $("#listOfMonths").prop("selectedIndex");
if (selectedIndex > 0) {
$("#listOfMonths").prop("selectedIndex", selectedIndex - 1);
}
}
function btnNextMonth_Click() {
// Note: the JQuery "prop" function requires JQuery v1.6 or later
var selectedIndex = $("#listOfMonths").prop("selectedIndex");
var itemsInDropDownList = $("#listOfMonths option").length;
// If we're not already selecting the last item in the drop down list, then increment the SelectedIndex
if (selectedIndex < (itemsInDropDownList - 1)) {
$("#listOfMonths").prop("selectedIndex", selectedIndex + 1);
}
}
My site is also useful for showing how to populate a drop down list with JSON data:
http://mikesknowledgebase.com/pages/Services/WebServices-Page8.htm
Just an FYI, you don't need to use CSS classes to accomplish this.
You can write the following line of code to get the correct control name on the client:
$("#<%= statusDDL.ClientID %>").val("2");
ASP.NET will render the control ID correctly inside the jQuery.
Just try with
$("._statusDDL").val("2");
and not with
$("._statusDDL").val(2);
After looking at some solutions, this worked for me.
I have one drop-down list with some values and I want to select the same value from another drop-down list... So first I put in a variable the selectIndex of my first drop-down.
var indiceDatos = $('#myidddl')[0].selectedIndex;
Then, I select that index on my second drop-down list.
$('#myidddl2')[0].selectedIndex = indiceDatos;
Note:
I guess this is the shortest, reliable, general and elegant solution.
Because in my case, I'm using selected option's data attribute instead of value attribute.
So if you do not have unique value for each option, above method is the shortest and sweet!!
I know this is a old question and the above solutions works fine except in some cases.
Like
<select id="select_selector">
<option value="1">Item1</option>
<option value="2">Item2</option>
<option value="3">Item3</option>
<option value="4" selected="selected">Item4</option>
<option value="5">Item5</option>
</select>
So Item 4 will show as "Selected" in the browser and now you want to change the value as 3 and show "Item3" as selected instead of Item4.So as per the above solutions,if you use
jQuery("#select_selector").val(3);
You will see that Item 3 as selected in browser.But when you process the data either in php or asp , you will find the selected value as "4".The reason is that , your html will look like this.
<select id="select_selector">
<option value="1">Item1</option>
<option value="2">Item2</option>
<option value="3" selected="selected">Item3</option>
<option value="4" selected="selected">Item4</option>
<option value="5">Item5</option>
</select>
and it gets the last value as "4" in sever side language.
SO MY FINAL SOLUTION ON THIS REGARD
newselectedIndex = 3;
jQuery("#select_selector option:selected").removeAttr("selected");
jQuery("#select_selector option[value='"+newselectedIndex +"']").attr('selected', 'selected');
EDIT: Add single quote around "+newselectedIndex+" so that the same functionality can be used for non-numerical values.
So what I do is actually ,removed the selected attribute and then make the new one as selected.
I would appreciate comments on this from senior programmers like #strager , #y0mbo , #ISIK and others
If we have a dropdown with a title of "Data Classification":
<select title="Data Classification">
<option value="Top Secret">Top Secret</option>
<option value="Secret">Secret</option>
<option value="Confidential">Confidential</option>
</select>
We can get it into a variable:
var dataClsField = $('select[title="Data Classification"]');
Then put into another variable the value we want the dropdown to have:
var myValue = "Top Secret"; // this would have been "2" in your example
Then we can use the field we put into dataClsField, do a find for myValue and make it selected using .prop():
dataClsField.find('option[value="'+ myValue +'"]').prop('selected', 'selected');
Or, you could just use .val(), but your selector of . can only be used if it matches a class on the dropdown, and you should use quotes on the value inside the parenthesis, or just use the variable we set earlier:
dataClsField.val(myValue);
So I changed it so that now it
executes after a 300 miliseconds using
setTimeout. Seems to be working now.
I have run into this many times when loading data from an Ajax call. I too use .NET, and it takes time to get adjusted to the clientId when using the jQuery selector. To correct the problem that you're having and to avoid having to add a setTimeout property, you can simply put "async: false" in the Ajax call, and it will give the DOM enough time to have the objects back that you are adding to the select. A small sample below:
$.ajax({
type: "POST",
url: document.URL + '/PageList',
data: "{}",
async: false,
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response) {
var pages = (typeof response.d) == 'string' ? eval('(' + response.d + ')') : response.d;
$('#locPage' + locId).find('option').remove();
$.each(pages, function () {
$('#locPage' + locId).append(
$('<option></option>').val(this.PageId).html(this.Name)
);
});
}
});
I use an extend function to get client ids, like so:
$.extend({
clientID: function(id) {
return $("[id$='" + id + "']");
}
});
Then you can call ASP.NET controls in jQuery like this:
$.clientID("_statusDDL")
Another option is to set the control param ClientID="Static" in .net and then you can access the object in JQuery by the ID you set.
<asp:DropDownList id="MyDropDown" runat="server" />
Use $("select[name$='MyDropDown']").val().
Just a note - I've been using wildcard selectors in jQuery to grab items that are obfuscated by ASP.NET Client IDs - this might help you too:
<asp:DropDownList id="MyDropDown" runat="server" />
$("[id* = 'MyDropDown']").append("<option value='-1'> </option>"); //etc
Note the id* wildcard- this will find your element even if the name is "ctl00$ctl00$ContentPlaceHolder1$ContentPlaceHolder1$MyDropDown"
How are you loading the values into the drop down list or determining which value to select? If you are doing this using Ajax, then the reason you need the delay before the selection occurs could be because the values were not loaded in at the time that the line in question executed. This would also explain why it worked when you put an alert statement on the line before setting the status since the alert action would give enough of a delay for the data to load.
If you are using one of jQuery's Ajax methods, you can specify a callback function and then put $("._statusDDL").val(2); into your callback function.
This would be a more reliable way of handling the issue since you could be sure that the method executed when the data was ready, even if it took longer than 300 ms.
<asp:DropDownList ID="DropUserType" ClientIDMode="Static" runat="server">
<asp:ListItem Value="1" Text="aaa"></asp:ListItem>
<asp:ListItem Value="2" Text="bbb"></asp:ListItem>
</asp:DropDownList>
ClientIDMode="Static"
$('#DropUserType').val('1');
In my case I was able to get it working using the .attr() method.
$("._statusDDL").attr("selected", "");
Pure JS
For modern browsers using CSS selectors is not a problem for pure JS
document.querySelector('._statusDDL').value = 2;
function change() {
document.querySelector('._statusDDL').value = 2;
}
<select class="_statusDDL">
<option value="1" selected>A</option>
<option value="2">B</option>
<option value="3">C</option>
</select>
<button onclick="change()">Change</button>
If we want to find from the option name and then selected options with the jQuery please see below code:-
<div class="control">
<select name="country_id" id="country" class="required-entry" title="Country" data-validate="{'validate-select':true}" aria-required="true">
<option value=""> </option>
<option value="SA">Saudi Arabia</option>
<option value="AF">Afghanistan</option>
<option value="AR">Argentina</option>
<option value="AM">Armenia</option>
<option value="AW">Aruba</option>
<option value="AU">Australia</option>
<option value="AT">Austria</option>
<option value="IS">Iceland</option>
<option value="IN">India</option>
<option value="ID">Indonesia</option>
<option value="IR">Iran</option>
<option value="IQ">Iraq</option>
<option value="IE">Ireland</option>
<option value="IM">Isle of Man</option>
<option value="IL">Israel</option>
<option value="IT">Italy</option>
<option value="JM">Jamaica</option>
<option value="JP">Japan</option>
<option value="JE">Jersey</option>
<option value="JO">Jordan</option>
<option value="AE">United Arab Emirates</option>
<option value="GB">United Kingdom</option>
<option value="US" selected="selected">United States</option>
</select>
</div>
<script type='text/javascript'>
let countryRegion="India";
jQuery("#country option:selected").removeAttr("selected");
let cValue= jQuery("#country option:contains("+countryRegion+")").val();
jQuery("#country option[value='"+cValue +"']").attr('selected', 'selected');
</script>
I hope this will help!
When i'm first time entering multi select values i got the current entered text value based on below code in jquery
<select class="form-control select2" multiple="multiple" data-placeholder="Select areas" style="width: 100%;" id="edit_areas" name="area">
</select>
$(".select2-search__field").val()
$(document).on('keyup',".select2", function (e) {
var city = $("#add_city option:selected").text();
var location = $(".select2-search__field").val();});
which works fine.
But on edit when try to enter more values,current entering value is failed to get by using above code its showing empty
Note: Here i'm setting the dropdown dynamically based on user enters
Can anyone help me to resolve this issue.
You should use select2 specific methods to get and set the value, once you already converted to the select2.
When you are setting the value (e.g. for edit), use code like following :
$(".select2").select2("val", "Am,WY".split(","));
and to get the value, use code like following :
$(".select2").select2('val');
Hope it will resolve your issue (as not sure what is the HTML and code you are having, its just a guess :-))
Without seeing your HTML or complete jQuery it's hard to see exactly what you are trying to do. So I have made a stab in the dark.
$(document).ready(function() {
$('.mrselect').on('change', function() {
var values = $(this).find('option:selected');
var fancyPantsArray = [];
values.each(function() {
fancyPantsArray.push($(this).val());
});
console.log(fancyPantsArray);
});
});
<select class="mrselect" multiple="multiple" name="mrselect">
<option value="Mr Option 1">Mr Option 1</option>
<option value="Mr Option 2">Mr Option 2</option>
<option value="Mr Option 3">Mr Option 3</option>
<option value="Mr Option 4">Mr Option 4</option>
<option value="Mr Option 5">Mr Option 5</option>
</select>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
try this
var nome = $("#select_id").data('select').$dropdown.find("input").val();
or
$('input.select2-input').val();
See in the Fiddle
I' m using JQuery select2 like the following
HTML
<select style="width:150px" id="lang" multiple >
<option value="1">1</option>
<option value="2">2</option>
<option value="11">3</option>
</select>
Javascript
$(document).ready(function() {
$('#lang').select2({
placeholder: 'please type'}
);
});
my problem is: I want to select an item programmatically
I use following code:
$("#lang").select2('val','11');
but the above code select the first item not the last one.
I believe...
$(element).select2();
...initializes Select2, rather than making a selection.
What you're probably looking for is something like this:
$("#lang").val("11").trigger("change");
If you want to select multiple values, you can use a string array, like so:
//Select 11, 12, 13
$("#lang").val(["11", "12", "13"]).trigger("change");
For more information, check out the Select2 Examples documentation.
how to get the selected text of the option.
<select class="float-left groupNames" name="Group">
<option value="preview[object Object]0">test</option>
<option value="preview[object Object]1">test1</option>
<option value="preview[object Object]2">test2</option>
</select>
I tried $(".groupNames option:selected").text();
but its not the right value. so I am getting testtest2 if I am selecting the third option.
$(".groupNames").val() is all you need.
jsFiddle example
However if you have multiple .groupNames elements, you'll need to be more specific with the selector.
$(".groupNames option:selected").text(); as you probably saw, will get the selected option's text, not the select's value.
hi please add an id to easily access the select here is an tested fiddle http://jsfiddle.net/elviz/259m3qkb/1/
$("#newSkill").change(function(){
var kamote = document.getElementById("newSkill").options[document.getElementById('newSkill').selectedIndex].text;
alert(kamote);
});
<select id="wbox" name="listbox" size="20"onchange="call(this)">
<optgroup label="Taxes">
<option value="1694" label="DNA-option1"></option>
<option value="1642">RNA-option2</option>
I have a list box that I would like to extract the label of the selected option, and use it in a JavaScript function.
function call(op) {
alert(op.label);
alert(op.name);
alert(op.value);
var x = op.label;
}
However this always returns as label, undefined. I've tried changing the way the option label is written in the html. This might not be the best way to write the java script function. I absolutely cannot use the option value, it is a unique id and used for something else. Any suggestions on what I am doing wrong or a better way to do this?
To get the selected <option>, you need to use the selectedOptions property. This is an array, because <select> tags can (optionally) support multiple selection. This array contains <option> tag objects, so you should be able to get your label using op.selectedOptions[0].textContent.
I guess:
<select id="wbox" name="listbox" size="20" onchange="call(this.selectedOptions)">
<optgroup label="Taxes">
<option value="1694" label="DNA-option1">RNA-option1</option>
<option value="1642" label="DNA-option2">RNA-option2</option>
</select>
<script type="text/javascript">
function call(op){
for(var i=0;i<op.length;i++){
console.log('Label: '+ op[i].getAttribute('label'));
}
}
</script>