Question

I have a form with one textbox. I want to check when the textbox value is empty and make some sort of red border surrounding the textbox itself when it’s empty.

if (document.getElementById('pageh').value == "") {
    alert("One of the fields is empty.");
    return false;
}

That’s my validation, but how do I add the red border?

Answer 1

var field = document.getElementById('pageh');

if (field.value == "") {
    document.getElementById('pageh').style.border = "solid 1px red";
    alert("One of the fields is empty.");
    return false;
}