get all the elements of a particular form

function getInputElements() {
    var inputs = document.getElementsByTagName("input");
}

The above code gets all the input elements on a page which has more than one form. How do I get the input elements of a particular form using plain JavaScript?

Solution 1:

document.getElementById("someFormId").elements;

This collection will also contain <select>, <textarea> and <button> elements (among others), but you probably want that.

Solution 2:

document.forms["form_name"].getElementsByTagName("input");

Solution 3:

You're all concentrating on the word 'get' in the question. Try the 'elements' property of any form which is a collection that you can iterate through i.e. you write your own 'get' function.

Example:

function getFormElelemets(formName){
  var elements = document.forms[formName].elements;
  for (i=0; i<elements.length; i++){
    some code...
  }
}

Hope that helps.