JavaScript Form Verification

& Lt; script & gt; functiontest () {if (document. a. B. value. length & gt; 50) {alert (& quot; cannot exceed 50 characters! & Quot;); document. a. B. focus (); returnfalse ;}& lt;/script & gt; & lt; form & gt; & lt

Script
Function test ()
{
If (document. a. B. value. length> 50)
{
Alert ("cannot exceed 50 characters! ");
Document. a. B. focus ();
Return false;
}
}
Script

2. Only Chinese characters are allowed

3. English only

Script
Function onlyEng ()
{
If (! (Event. keyCode> = 65 & event. keyCode <= 90 ))
Event. returnvalue = false;
}
Script

4. Only numbers are allowed.

Script
Function onlyNum ()
{
If (! (Event. keyCode> = 48 & event. keyCode <= 57) | (event. keyCode> = 96 & event. keyCode <= 105 )))
// Consider the numeric keys on the keypad
Event. returnvalue = false;
}
Script

5. Only English characters and numbers are allowed.

6. Verify the email format