Invalid Characters.

[sinha]

I want to write a Javascript function so that the user is barred from entering invalid characters like"!@#$%^&*()_+" in a sensitive field like User Name.


Please Help.

[Sastraxi]

You can do this during validation of a form. Just see if any of them are in the string and if it is, cancel the submission of the form.

[sinha]

I haven't done much of javascript. Can i get the syntaxes pls.

[DeadEyes]

//param val is string to check ie username
function isAlphaNumeric(val){
	var str = new String(val);
	return (str.search(/\W/)=="-1")?true:false;
}

Add an onClick event to the login button and call the function
if it's true and other validation ok then submit the form

[Rick Bull]

Add it to the onsubmit of the form instead, it's the better place to put it (unless you have two submit buttons and you don't need the validation for one)