Select2 val does not work for integer value - javascript

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.

Related

See which option was just selected in a multiselect

I have a multiselect bootstrap picker and would like to find the specific option that was just selected. For example, if I have the picker set to something like this:
<select class="form-select selectpicker" multiple aria-label="Default example">
<option value="Apple">Apple</option>
<option value="Cherry">Cherry</option>
<option value="Papaya">Papaya</option>
<option value="Kiwi">Kiwi</option>
</select>
When the user selects their first option, "Cherry", I would like to alert("Cherry"). When the user then selects their second option, "Apple", I would like to alert("Apple").
I have tried to use the option:selected:last value, but this only works to display the last option in the array of selected option. I would like to display the option that was most recently selected, regardless of its place in the array of selected options. Any insight is greatly appreciated.
EDIT: This questions was closed due to being marked as similar to the question found here: Get selected value in dropdown list using JavaScript
After looking through all of the provided answers in that link, I am not convinced that the questions are the same. I would like to get the most recently selected text in a multiselect picker, not the only selected option in a single select. So, if a user has both Apple and Papaya options selected, but selected the Apple option after selecting the Papaya option, I would like to alert("Apple"). Thanks.
Here Are Two Methods By which you can Use Alert.
First Method: With OnChange
<select class="form-select selectpicker" multiple aria-label="Default example" onchange = "alert(this.value)">
<option value="Apple">Apple</option>
<option value="Cherry">Cherry</option>
<option value="Papaya">Papaya</option>
<option value="Kiwi">Kiwi</option>
</select>
Second Method: Involves An Event Listener But Its Doing The Same Thing(Javascript)(Assuming That The ID of The Select Tag is selector
function change(){
alert(this.value)
}
document.getElementByID("selector").addEventListener("onchange",change)

Need Help to Scrape a Website [duplicate]

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!

Shopify Variant Is Not Selected After JS action

Using funnel builder app for Shopify. Got 1 native shopify select item that's choosing variants, 2 other static input methods that I added (radio buttons and input), and JS that pulls input values from these 2 and sets select to it. The problem is- on the front end, it changes select value, but when I add to cart, it's still adding default option.
The select html looks like this.
<select class="form-control variant_Quantity" onchange="change_product_variant(this);" id="select_61">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
And this is my jQuery
$(".pricelinewrap").each(function(){
$(this).click(function(){
$(this).find("input[type=radio]").prop('checked', 'checked');
var quanval = $(this).find("input[type=radio]").prop('checked', 'checked').val();
$("input[name='quantity']").val(quanval);
$("select#select_62").val(quanval);
});
});
$("input[name='quantity']").change(function(){
var newquanval = $(this).val();
$("select#select_62").val(newquanval);
});
Keep in mind- everything works on the front end. But looks like i'm missing something that the actual variant is not selected. However, select option is shown correctly, when something else is changed.
You have to trigger change event to the select, since the following code:
$("input[name='quantity']").val(quanval);
$("select#select_62").val(quanval);
only changes the value of the select but it doesn't fire the actual change event.
It should become like this:
$("input[name='quantity']").val(quanval).trigger('change');
$("select#select_62").val(quanval).trigger('change');

Select latest selected value of a dropdown

Is there a way to select the latest user's selected value of a dropdown?
Eg:
<select id="data" name="data" class="data" multiple="multiple">
<option value="100">foo</option>
<option value="101">bar</option>
<option value="102">bat</option>
<option value="103">baz</option>
</select>
If I use something like the bellow example, what I get is the last index, but it's not what I want.
var latest_value = $("option:selected:last",this).val();
What I want is something like: if you select "bar", I get 101, if you select "foo" I get 101 instead of 100.
OBS: all my examples are considering that the user is selecting multiple values, not just one.
Use this simple js code:
var is_now_selected = document.getElementById('data').value;
// or with jQuery
var is_now_selected = $('#data').val()
Maybe you don't know that the option-value accually is the value of the select. If you click <option value="something"> which is inside a <select name="select_me">, then this select will have the value of the selected option - in this case - "select_me".
You can write this code. It may help you.
Please let me know if you have anymore problem.
$("#data").change(function () {
alert($("#data").val());
});

How to set dropdownlist to multiple values?

The syntax to set a dropdownlist to multiple values is as following:
$("#multiple").val(["Multiple2", "Multiple3"]);
My problem is that I don't know how many values I have. So how do I set a dropdownlist dynamicaly to multiple values with values from an array?
Your code should work as seen in this live demo.
Markup:
<select multiple="multiple" id="multiple">
<option value="1">item 1</option>
<option value="2">item 2</option>
</select>
Script:
$('#multiple').val(['1', '2']);
Result:
​
do a check to know if the array has more values:
if (array[i]) { //DO WHAT YOU NEED}
It's not clear to me what you're trying to achieve.
You can use an array as argument of val() and this is the result:
> Passing an array of element values allows matching <input
> type="checkbox">, <input type="radio"> and <option>s inside of n
> <select multiple="multiple"> to be selected. In the case of <input
> type="radio">s that are part of a radio group and <select
> multiple="multiple"> the other elements will be deselected.
That means that will affect in your case only a select with muptiple choice enabled (and not a simple dropdown list).
If, on the contrary by 'set to multiple values' means adding options to an existing select, val() is not built to do that (for this you can have a look here)

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