error coming while validating textboxes in asp.net using javascripts

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i used the following code for textbox validation..

this is the function which i defined in the javascript file.i done this to ensure the textbox should not be null and the textbox should contain only alphabets.

C#

function RegainFocus() 
        { 
            if((document.getElementById("TextBox1").value).length == 0 || 
            (document.getElementById("TextBox2").value).length == 0 ||
            (document.getElementById("TextBox3").value).length == 0||
            !document.getElementById("TextBox1").value.match(/^[a-zA-Z]+$/)||
            !document.getElementById("TextBox2").value.match(/^[a-zA-Z]+$/)||
            !document.getElementById("TextBox3").value.match(/^[a-zA-Z]+$/)) 
             { 
               alert ("please enter a valid data");
             }            
        }

in the form load event i called the javascript file as

C#

Page.RegisterClientScriptBlock("MyScript", "<SCRIPT     Language='JavaScript' src='JScript.js'></SCRIPT>");
Button1.Attributes.Add("OnClick", "RegainFocus()");

this is throwing error for me....."Microsoft JScript runtime error: Object required"

can anyone plss help me in doing this..........???

Posted 17-Feb-12 1:54am

amaljosep

Updated 17-Feb-12 2:31am

Anuja Pawar Indore

v3

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Sanjeev Alamuri · Answer 1 · 2012-02-17T01:59:00

Solution 1

i.e u are calling the script function while loading page, so u r calling the script function before loading the textboxes. that y its giving the object error.

hence,
add script tag in header tag of aspx page

JavaScript

<head runat="sever">
<SCRIPT Language='JavaScript' src='JScript.js'></SCRIPT>

then u can call this

JavaScript

Button1.Attributes.Add("OnClick", "RegainFocus()");</head>

Posted 17-Feb-12 1:59am

Sanjeev Alamuri

Updated 17-Feb-12 2:30am

v2

Comments

amaljosep 17-Feb-12 8:11am

i am using a content page....so it does'nt contain head tags and all....so where i can place the script tag in the content page ....

Sanjeev Alamuri 17-Feb-12 8:20am

place after content tag
<asp:content ContentPlaceHolderID="ContentPlaceHolder" ID="content2" runat="server">
<SCRIPT Language='JavaScript' src='JScript.js'></SCRIPT>
...
...
...
...
// ur design
...

Supriya Srivastav · Answer 2 · 2012-02-17T02:00:00

Solution 2

Use FilteredTextBoxExtender of Ajax for validation.

Posted 17-Feb-12 2:00am

Supriya Srivastav

Sudip Saha · Answer 3 · 2012-02-17T02:06:00

Solution 3

Use document.getElementById("<%=TextBox1.ClientID%>").value

Posted 17-Feb-12 2:06am

Sudip Saha