Develop Reference

Need to identify which textbox is used using javascript

I have four text boxes in 4 different tabs of an ASP.NET Page. I need to provide same validation message to all the text boxes. Presently I am using four different functions with same functionality. Kindly suggest a way to identify which textbox is being used make that a single funtion
Code from Commend:
<asp:TextBox ID="textBox1" runat="server" ValidationonGroup="abcd"></asp:TextBox>
<asp:CustomValidator ID="ID1" runat="server" ValidationGroup="abcd"
ControlToValidate="textBox1" ErrorMessage="message"
ClientValidationFunction="fname"></asp:CustomValidator>
--Javascript Fn--
function fname(sender, args) {
var x = document.getElementById('<%=txtBox1.ClientID%>').value;
if (some condition) {
args.IsValid = false;
} else {
args.IsValid = true;
}
}

Edit
if you are using Asp.Net then you should use like this
Aspx page code
<div>
<asp:TextBox runat="server" ID="txt1" ClientIDMode="Static" onKeyPress="javascript:text_changed(this.id);"></asp:TextBox>
</div>
JS Code
<script type="text/javascript">
function text_changed(event)
{
var id = event;
alert(id);
}
</script>
You got the textbox id in id variable and now u can get value etc using this id you are applying your conditions.... i hope this will help u

Updating of the asp.net dropdown control using javascript

In my ASP.Net default.aspx, I have dropdown list control and following javascript code
<asp:DropDownList ID="ddlGenres" runat="server" AppendDataBoundItems="True" AutoPostBack="True" DataSourceID="EntityDataSource2" DataTextField="cityID" DataValueField="cityID" OnSelectedIndexChanged="ddlGenres_SelectedIndexChanged" ClientIDMode="Static" >
<script type="text/javascript">
var ddlClientID = '<%=ddlGenres.ClientID%>';
//document.getElementById(ddlGenres)
function SetddlVal(nIndx)
{
//$("#ddlGenres")
var ddlListSelect = document.getElementById(ddlClientID);
ddlList.SelectedIndex = nIndx;
}
</script>
====================================================================
In a external javascript file, I am calling the function SetddlVal.
I debugged the code and the ddlList selectedIndex is successfully changed within the script.
=====================================================================
The issue I am facing is, when the SelectedIndex value is changed in the javascript, The ddlGenres_SelectedIndexChanged code is not being triggered.
Please let me know if I am missing anything.
Thanks
Nate

In javascript the property of an <select> input is selectedIndex not SelectedIndex.
Change your function to this:
function SetddlVal(nIndx)
{
var ddlListSelect = document.getElementById('<%=ddlGenres.ClientID%>');
ddlListSelect.selectedIndex = nIndx;
}

Store javascript return value of a function to the respective Asp Control OnClick event at server side

<asp:Button ID="Button1" runat="server" Text="Lunch" CausesValidation="false"
CssClass="bigbuttons"
style="background:url(../App_Themes/Images/green-box.gif)"
Font-Bold="True" ForeColor="White" Font-Size="Large"
OnClientClick="openmodalWin(); return false;" />
<br />
javascript
function openmodalWin() {
var CloseTImeOfPopUp = window.showModalDialog("ClockPopUP.aspx", "Clock",
"dialogWidth:550px;dialogHeight:350px,");
}
As you can see, I'm calling the javascript function "openmodalWin" on the ButtonClick event. I checked that the function is returning CloseTimeofPopUp sucessfully and I am able to display it via an Alert().
[Moderator Edit: I want the returned value of that function to be sent to the server so that I can store it in the database?]
I want the return value from the javascript function, i can store on the same server side code i.e. Button1_OnClick() event and then i can store it to database.
Please tell me how i can do this ?

You can set the value of CloseTimeOfPopUp in a hidden variable (defined with runat="server") and then you can access that in the code behind.
In aspx page you can do:
<input type="hidden" runat="server" id="hidden1" />
In javascript
function openmodalWin() {
var CloseTImeOfPopUp = window.showModalDialog("ClockPopUP.aspx", "Clock", "dialogWidth:550px;dialogHeight:350px,");
document.getElementById('hidden1').value = CloseTImeOfPopUp;
}
In code behind in C#
var myVal = hidden1.Value;

in addition to Habib.OSU
in the page you are opening with showModalDialog
you should return the value like this...
javascript in the Modal Dialog Page:
function ReturnVal(valToReturn) {
window.returnValue = valToReturn;
window.close();
}

How to pass ID to a java script function in ASP.NET

Hi, I have following java script function:
function EnableDisableTextBox(chkBoxId, txtBoxId) {
var isChk = document.getElementById(chkBoxId);
document.getElementById(txtBoxId).disabled = !(isChk.checked);
}
When I am trying to call above function, by clicking check box its not working as expected
<asp:CheckBox ID="chkBachelors"
onclick="javascript:EnableDisableTextBox('chkBachelors','txtFirstDegree');"
runat="server" Text='<%$Resources:Resource, FirstDegree %>' TextAlign="Left"/>
<asp:TextBox ID="txtFirstDegree" CssClass="form-text" runat="server"
MaxLength="250"></asp:TextBox>
Expected Result (When user click chkBachelors check box):
if "chkBachelors" check box is checked
then enable "txtFirstDegree" text box
else
disable "txtFirstDegree" text box
What is the problem and how to solve it?

<asp:CheckBox ID="chkBachelors"
onclick="EnableDisableTextBox(this);"
runat="server" Text='' TextAlign="Left"/>
<asp:TextBox ID="txtFirstDegree" CssClass="form-text" runat="server"
MaxLength="250"></asp:TextBox>
<script language ="javascript" type="text/javascript">
function EnableDisableTextBox(checkbox)
{
var txtBoxId= "<%=txtFirstDegree.ClientID%>";
document.getElementById(txtBoxId).disabled = !(checkbox.checked);
}
</script>

<%=chkBachelors.ClientID%> and <%=txtFirstDegree.ClientID%> will give the client side ID of the Asp.Net controls .You don't need to pass them explicitly
function EnableDisableTextBox() {
var isChk = document.getElementById(<%=chkBachelors.ClientID%> );
document.getElementById(<%=txtFirstDegree.ClientID%>).disabled = !(isChk.checked);
}

How to pass javascript var to server side on asp.net

I'm trying to pass a textarea value to the server side. The textarea cant be runat=server though.
heres my code:
<script type="text/javascript">
function replace() {
//Replace < and > on textarea
var obj = document.getElementById('recipient_list');
var str = obj.value;
str = str.replace(/</i, "(");
str = str.replace(/>/i, ")");
obj.value = str;
alert("rec_lst.value: " + document.getElementById('recipient_list').value);
//Pass value to server.
alert("passing to server");
document.getElementById("ctl00$ContentPlaceHolder1$txtEmails").value = str;
alert("Passed to server");
alert("txtEmails.value: " + document.getElementById("ctl00$ContentPlaceHolder1$txtEmails").value);
}
</script>
This isn't working though... Any ideas how to fix or better implement this??..

Try this:
var txtEmail = document.getElementById("<%=txtEmails.ClientID%>");
txtEmail.value = str;
However this won't pass anything to the server, just change text box value.
To have it sent to the server user will have to click submit button, or if you have server side button have such code to "auto click" it thus performing post back:
document.getElementById("<%=btnSubmit.ClientID%>").click();

you cant pass value from client to server using JS .
JS is only a client side code.If you can do something like this, Hacking will be so easy :)
one thing you can do is add some text or label control as invisible and assign the value to the control and pass it to server when some event happens.
Sample code
<asp:TextBox ID="textbox1" runat="server" ></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="callOnEvets()"/>
function callOnEvets()
{document.getElementById('textbox1').value = 10; }