<form>
JS.info ⟩ Form properties and methods ⭐️⭐️
<label>
access form & elements
const {log} = console;
/*
⭐️ document forms are members of `document.forms`
⭐️ form elements are available in `form.elements`
*/
// ⭐️ get <form> by "name"
let form = document.forms.form1; // <form name="form1">
// = document.forms[0]
// ⭐️ get <input> by "name"
let input = form.elements.age; // <input name="age">
log(input.value); // 17
// ⭐️ being radio buttons, `form.elements['sex']` is a collection
let sex = form.elements.sex; // RadioNodeList ⭐️
// ⭐️ value of checked radio button ('' if none checked ⭐️)
log(sex.value) // "female"
// ⭐️ turn collection into array
let values = [...sex].map(input => input.value)
log(values) // ["male","female"]
<fieldset> as "subform"
// ⭐️ form.elements: HTMLFormControlsCollection
log(form.elements.username); // <input name="username">
// ⭐️ fieldset
let fieldset = form.elements.userInfo; // HTMLFieldSetElement
log(fieldset.nodeName) // FIELDSET
// ⭐️ fieldset is a "subform"
// ⭐️ fieldset.elements: HTMLFormControlsCollection
log(fieldset.elements.username === form.elements.username) // true
// ⭐️ shorter notation: form.name
log(form.username === form.elements.username) // true
Last updated
Was this helpful?