why textbox onchange event to call javascriptfunction not working?

Question

My asp controls:

<asp:TextBox ID="txtCustomer" runat="server" width="54%" onchange="return info();">      </asp:TextBox>
 <asp:HiddenField ID="hdn" runat="server" />
<asp:DropDownList ID="ddlrNo" runat="server">
 </asp:DropDownList>

My javascript function:

function info() {  

var ss = document.getElementById(hdn);   
 var ss1 = document.getElementById(ddlrNo);
  var str = ss.value    
 var arr = str.split("~");
 alert(arr[0])
 for (var i = 0; i < arr.length; i++) {

    ss1.selectedIndex = 0
    ss1.options[0].text = arr[0];
}
}

I have a textbox on which i have to call javascript function,to get value from hidden field to populate dropdown value based on that hidden filed.

but it is not working what is wrong with the code.

Usman Waheed · Accepted Answer · 2014-02-26 07:08:28Z

1

there are some things incorrect in the code first document.getElementById(hdn); should be used in single or double quotes e.g.

document.getElementById("hdn");

same is the case with next line as well then ss1.options[0].text this is incorrect as well .value is more appropriate when accessing drop down list in javascript

answered Feb 26, 2014 at 7:08

Usman Waheed

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3 Comments

sona Over a year ago

If i am trying to get the value through "" then showing null in alert alert(document.getElementById("hdn"))

Usman Waheed Over a year ago

thats because arr[0] has nothing to show, u need more to understand about how do to do things in javascript, perhaps u would better use .getElementById("txtCustomer") in place of hdn

sona Over a year ago

For other controls alert message showing OBJECTHTMLINPUTELEMENT. Nd arr[0] is written later in the js code,from the begining i am giving the alert

Shreyas Achar · Accepted Answer · 2014-02-26 07:09:41Z

0

Try this

<asp:TextBox ID="txtCustomer" runat="server" width="54%" onblur="javascript:info()"/>

answered Feb 26, 2014 at 7:09

Shreyas Achar

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