How to loop through elements of a form with JavaScript

In order to loop through elements of a form, you will first need to retrieve the form elements. Once you get a reference of your form, then you can iterate the elements collection.

Method #1: using getElementById

var elements = document.getElementById("my-form").elements;

for (var i = 0, element; element = elements[i++];) {
    if (element.type === "text" && element.value === "")
        console.log("it's an empty textfield")
}

Method #2: using querySelectorAll

var elements = document.querySelectorAll("#my-form input[type=text]")

for (var i = 0, element; element = elements[i++];) {
    if (element.value === "")
        console.log("it's an empty textfield")
}

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