Add a class (something like input-error) for every invalid field. Then use something like:
var errors = document.querySelectorAll(".input-error");
if (errors.length > 0) {
errors[0].focus();
}
Here's an example: http://jsfiddle.net/NtHzV/1/
It really all depends on the structure of your code, how you're validating, what you're actually doing with validation, and what your HTML is.
At the same time, if you're doing something similar to my example, you might as well keep track of the first input with an error, then focus() it at the end of validation. Something like this:
http://jsfiddle.net/NtHzV/2/
UPDATE:
Bergi pointed out that querySelector might as well be used (instead of querySelectorAll) because you're only looking for the first input with errors. So here's an update:
var error_input = input_area.querySelector(".input-error");
if (error_input !== null) {
error_input.focus();
}
http://jsfiddle.net/NtHzV/3/
Here are specs on querySelector: developer.mozilla.org/.../element.querySelector - Note that < IE8 does not support it.
The use of ".input-error" is because that is the CSS class selector, and will find the first (if any) element in a specific area with the class "input-error".
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