How to run DropDownList change event

Question

Hello i trying to change ddl.selectedIntex=1,i see that value of ddl is changing but event ddl.change did't work.

$("#ctl00_PlaceHolderMain_AccountsDDL_ddlAccounts")[0].selectedIndex = 1;

This just set the value but i need to run the .change function

any ideas? I try this in console all works thx,meybe you know how can i do this by passing the PostData to the HttpWebRequest?

I try this in console all works thx,meybe you know how can i do this by passing the PostData to the HttpWebRequest I added my code

HttpWebRequest postRequest = (HttpWebRequest)WebRequest.Create("https://www.com/Pages/current.aspx");
PostString += "ctl00$PlaceHolderMain$AccountsDDL$ddlAccounts=" + Number + "&";//Here
 byte[] byteArray = Encoding.ASCII.GetBytes(PostString);
    postRequest.ContentLength = byteArray.Length;
    Stream newStream = postRequest.GetRequestStream();
    newStream.Write(byteArray, 0, byteArray.Length);
    newStream.Close();
    HttpWebResponse postResponse = (HttpWebResponse)postRequest.GetResponse();

use __doPostBack('ctl00_PlaceHolderMain_AccountsDDL_ddlAccounts',''); or $("#ctl00_PlaceHolderMain_AccountsDDL_ddlAccounts").change() — joker
– joker, Commented Apr 7, 2014 at 9:30
I try this in console all works thx,meybe you know how can i do this by passing the PostData to the HttpWebRequest? — user3458958
– user3458958, Commented Apr 7, 2014 at 9:35

Adil · Accepted Answer · 2014-04-07 09:28:12Z

4

The change event is not triggered when value is changed through code. You need to call change() or trigger("change")

$("#ctl00_PlaceHolderMain_AccountsDDL_ddlAccounts").change()

or

$("#ctl00_PlaceHolderMain_AccountsDDL_ddlAccounts").trigger("change")

As a additional note use the Control.ClientID to get the element in javascript instead of using the hard coded asp.net generated client id.

$("#<%= ddlAccounts.ClientID %>").change()

answered Apr 7, 2014 at 9:28

Adil

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7 Comments

Jaroslav Kubacek Over a year ago

Adil is right, change event is not fired in case that value is changed programmatically (by javascript).

Bharadwaj Over a year ago

$('[id$="ddlAccounts"]') can also be used to get the element.

Adil Over a year ago

Yes, but I think that is less efficient way as it will have to search for matching element instead of directly getting the element.

Bharadwaj Over a year ago

$("#<%= ddlAccounts.ClientID %>") will not work if the scripts are placed in .js file. In that case $("#dllAccounts") can be used provided with attribute ClientIdMode = "static" for the DropDownList or $('[id$="ddlAccounts"]') can be used if ClientIdMode property is not set.

user3458958 Over a year ago

Can you help me with sending data to HttpWebRequest i added new code on top

|

Vinay Pratap Singh Bhadauria · Accepted Answer · 2014-04-07 09:46:56Z

0

or just use this

$("[id$=ddlAccounts]").change();

use of $ 'Ends with' to shorten the name of selector

edited Apr 7, 2014 at 9:46

answered Apr 7, 2014 at 9:41

Vinay Pratap Singh Bhadauria

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Comments

Jaisankar · Accepted Answer · 2014-04-07 10:01:26Z

0

 <script>
        $("select").change(function () {
            var str = "";
            $("select option:selected").each(function () {
                str += $(this).text() + " ";
                $("#DropDownList1")[0].selectedIndex = 5;
            });
            $("div").text(str);
        }).change();

    </script>
    <div></div>

Try this.... it may help you

answered Apr 7, 2014 at 10:01

Jaisankar

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