How to avoid special chars using javascript

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Hi Expert,

I am uday satardekar,

In my asp.net website nridubai i am using javascript for validation

eg

JavaScript

var eventName=document.getElementById("<%=txtEventName.ClientID%>").value;

 if (eventName=="")
      {
                 alert("Name Feild can not be blank");
                 document.getElementById("<%=txtEventName.ClientID%>").focus();
                 return false;
      }

Its working fine for me.

now i want validation for special chars.Please give solution .

Thanks in advance.........

Posted 12-Oct-11 1:00am

udusat13

Updated 28-Jun-12 22:59pm

v3

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Comments

E.F. Nijboer 12-Oct-11 7:08am

You chose asp.net so why not use field validators then?
http://msdn.microsoft.com/en-us/library/aa479013.aspx

udusat13 12-Oct-11 7:19am

Thankssssss..

To avoid server round trips, i am using client side scripting.

Sandeep Mewara 29-Jun-12 5:03am

And the new edit/update was done for?

3 solutions

Solution 1

check the folllowing function

JavaScript

function avoid_Special()
{
 myString = new String("*&^%$#@") //list of special char.
 if(myString.indexOf(document.getElementById("txtOK").value) != -1)
 alert("Special char not allowed");
 return false;

}

Posted 12-Oct-11 1:07am

koolprasad2003

Updated 12-Oct-11 1:09am

v2

Comments

udusat13 12-Oct-11 7:20am

Thanks for replying me,

I have modified my code like following

myString = new String("*&^%$#@") //list of special char.
if(myString.indexOf(eventName) != -1){
alert("Special char not allowed");
return false;
}

and its working only if first letter is special char,

Please guied me .

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member60 · Accepted Answer · 2011-10-12T01:42:00

in OnClientClick event u can call the following function:

C#

function valid()
    {
    debugger;
     var s = "!@#$%^&*()+=-[]\\\';,./{}|\":<>?";
     str=document.getElementById('<%=TextBox1.ClientID%>').value;
     for (var i = 0; i < str.length; i++)
     {
        if (s.indexOf(str.charAt(i)) != -1)
      {
         alert ("The box has special characters. \nThese are not allowed.\n");
        document.getElementById('<%=TextBox1.ClientID%>').value="";
         return false;
      }
    }
    }

sravani.v · Accepted Answer · 2011-10-12T01:19:00

C#

var iChars = "!@#$%^&*()+=-[]\\\';,./{}|\":<>?";

 for (var i = 0; i < document.formname.fieldname.value.length; i++) {
   if (iChars.indexOf(document.formname.fieldname.value.charAt(i)) != -1) {
   alert ("Your username has special characters. \nThese are not allowed.\n Please remove them and try again.");
   return false;
   }
 }

Refer This link:
http://psacake.com/web/jb.asp[^]

How to avoid special chars using javascript

3 solutions

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Solution 1

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