How to loop through all elements of a form jQuery

I was just wondering what the best way of looping through all the child elements of a form would be? My form contains both input and select elements.

At the moment I have:

success: function(data) {
				$.each(data.details, function(datakey, datavalue) {
					$('#new_user_form > input').each(function(key, value) {
						if($(this).attr('id') == datakey) {
							$(this).val(datavalue);
						}
					});
				});
			}

This only loops through the input elements of the form though and I want to include the select elements too:

I have tried:

$('#new_user_form > input, #new_user_form > select').each(function(key, value) {

but this doesn't work. Does anyone know why this would be happening? Thanks!

From the jQuery :input selector page:

>Because :input is a jQuery extension and not part of the CSS specification, queries using :input cannot take advantage of the performance boost provided by the native DOM querySelectorAll() method. To achieve the best performance when using :input to select elements, first select the elements using a pure CSS selector, then use .filter(":input").

This is the best choice.

$('#new_user_form *').filter(':input').each(function(){
    //your code here
});

pure JavaScript is not that difficult:

for(var i=0; i < form.elements.length; i++){
	var e = form.elements[i];
	console.log(e.name+"="+e.value);
}
			

Note: because form.elements is a object for-in loop does not work as expected.

Answer found here (by Chris Pietschmann), documented here (W3S).

$('#new_user_form').find('input').each(function(){
   //your code here
});

As taken from the #jquery Freenode IRC channel:

$.each($(form).serializeArray(), function(_, field) { /* use field.name, field.value */ });

Thanks to @Cork on the channel.

I'm using:

$($('form').prop('elements')).each(function(){
    console.info(this)
});

It Seems ugly, but to me it is still the better way to get all the elements with jQuery.

I have found this simple jquery snippet, to be handy for choosing just the type of selectors I want to work with:

---

$("select, input").each(function(){
     // do some stuff with the element
});

What happens, if you do this way:-

$('#new_user_form input, #new_user_form select').each(function(key, value) {

Refer LIVE DEMO

$('#new_user_form :input') should be your way forward. Note the omission of the > selector. A valid HTML form wouldn't allow for a input tag being a direct child of a form tag.

> Do one of the two jQuery serializers inside your form submit to get all inputs having a submitted value.

var criteria = $(this).find('input,select').filter(function () {
   	return ((!!this.value) && (!!this.name));
}).serializeArray();
    
var formData = JSON.stringify(criteria);

> serializeArray() will produce an array of names and values > > 0: {name: "OwnLast", value: "Bird"}
> 1: {name: "OwnFirst", value: "Bob"}
> 2: {name: "OutBldg[]", value: "PDG"}
> 3: {name: "OutBldg[]", value: "PDA"}

var criteria = $(this).find('input,select').filter(function () {
	return ((!!this.value) && (!!this.name));
}).serialize();

> serialize() creates a text string in standard URL-encoded notation > > "OwnLast=Bird&OwnFirst=Bob&OutBldg%5B%5D=PDG&OutBldg%5B%5D=PDA"