code/recipes/JavaScript/578606_Verify_html_form_with_JavaScript/recipe-578606.js at PythonSortedCollectionBounds · theSundayProgrammer/code · GitHub

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function validateForm(str)

{

// first name is required

var fn=document.forms[str]["first_name"].value;

if (fn == "")

{

alert("Please Fill In First name");

return false;

}

// last name is required

var fn=document.forms[str]["last_name"].value;

if (fn == "")

{

alert("Please Fill In Last name");

return false;

}

// verify email if provided

var em=document.forms[str]["email"].value;

if (em != "") {

var atpos=em.indexOf("@");

var dotpos=em.lastIndexOf(".");

if (atpos<1 || dotpos<atpos+2 || dotpos+2>=em.length)

{

alert("You have entered an invalid e-mail address");

return false;

}

}

}