Rani

• Mar 30th, 2007

 

According To my knowledge,
   <form name="form1">                        

  <input type="text" name="text1" onchange="calling()" />

</form>

<script language="javascript">

function calling()

{

      if(document.form1.text1.value=="")
                 alert("please enter the text1 field");

}

</script>

jitendra224

 Profile Answers by jitendra224 

• Apr 12th, 2010

 

Write with inscript

<script type="text/javascript">

function validateFormOnSubmit(theForm) 

{

           var reason = "";

           reason = validateUsername(theForm.name);

}

function validateUsername(fld) 

{

var error = "";

var regex1 = /[0-9]/;

var illegalChars = /[W_]/;

//var regex=/^[a-zA-Z]/;

//var valid = /W/; // allow letters, numbers, and underscores

//var illegalChars = /^.w*w*.+$/; //check alphabetic chars

if (fld.value == "") 

{

                 fld.style.background = 'Yellow'; 

                                  error = "You didn't enter Name.n";

}

  else if ((fld.length < 5) || (fld.length > 15)) 

  {

                  fld.style.background = 'Yellow'; 

                   error = "The Name is the wrong length.n";

} 

  else if (fld.value.match(regex1)) 

  {

                   fld.style.background = 'Yellow'; 

                    error = "Numbers are not allowed in Name.n";

  } 

  else if (fld.value.match(illegalChars)) 

  {

                   fld.style.background = 'Yellow'; 

                   error = "The Name contains illegal characters.n";

} 

else 

{

                                   fld.style.background = 'White';

}

return error;

}

 

<form  onsubmit="return validateFormOnSubmit(this)" method="GET" >

<table>

<tr>

<TD> Name </TD>

<TD><input type ="text"  name="name" ></html></TD>

</tr>

</table>

<form>      

</script>

richi.sankalp1990

 Profile Answers by richi.sankalp1990 

• Apr 15th, 2010

 

A textbox can be validated using a JavaScript, by using a redirection to the JavaScript page ..say I need to check for username, then, we redirect the form to login.js (JavaScript for the checking) by the action attribute.

Inside login.js
we can create an array and have something like this
int flag=0;
array[names]={"name1",......};
for(int i=0;i<n;i++)
if(username==array[i])
{
flag=1;
}
if (flag==0)
alert("incorrect username");
}