JS Reference

JS by Category JS by Alphabet

JavaScript

JS Array JS Boolean JS Classes JS Date JS Error JS Global JS JSON JS Math JS Number JS Operators JS RegExp JS Statements JS String

Window

Window Object Window Console Window History Window Location Window Navigator Window Screen

HTML DOM

DOM Document DOM Element DOM Attributes DOM Events DOM Event Objects DOM HTMLCollection DOM Style
alignContent alignItems alignSelf animation animationDelay animationDirection animationDuration animationFillMode animationIterationCount animationName animationTimingFunction animationPlayState background backgroundAttachment backgroundColor backgroundImage backgroundPosition backgroundRepeat backgroundClip backgroundOrigin backgroundSize backfaceVisibility border borderBottom borderBottomColor borderBottomLeftRadius borderBottomRightRadius borderBottomStyle borderBottomWidth borderCollapse borderColor borderImage borderImageOutset borderImageRepeat borderImageSlice borderImageSource borderImageWidth borderLeft borderLeftColor borderLeftStyle borderLeftWidth borderRadius borderRight borderRightColor borderRightStyle borderRightWidth borderSpacing borderStyle borderTop borderTopColor borderTopLeftRadius borderTopRightRadius borderTopStyle borderTopWidth borderWidth bottom boxShadow boxSizing captionSide caretColor clear clip color columnCount columnFill columnGap columnRule columnRuleColor columnRuleStyle columnRuleWidth columns columnSpan columnWidth counterIncrement counterReset cursor direction display emptyCells filter flex flexBasis flexDirection flexFlow flexGrow flexShrink flexWrap cssFloat font fontFamily fontSize fontStyle fontVariant fontWeight fontSizeAdjust height isolation justifyContent left letterSpacing lineHeight listStyle listStyleImage listStylePosition listStyleType margin marginBottom marginLeft marginRight marginTop maxHeight maxWidth minHeight minWidth objectFit objectPosition opacity order orphans outline outlineColor outlineOffset outlineStyle outlineWidth overflow overflowX overflowY padding paddingBottom paddingLeft paddingRight paddingTop pageBreakAfter pageBreakBefore pageBreakInside perspective perspectiveOrigin position quotes resize right scrollBehavior tableLayout tabSize textAlign textAlignLast textDecoration textDecorationColor textDecorationLine textDecorationStyle textIndent textOverflow textShadow textTransform top transform transformOrigin transformStyle transition transitionProperty transitionDuration transitionTimingFunction transitionDelay unicodeBidi userSelect verticalAlign visibility width wordBreak wordSpacing wordWrap widows zIndex

Web APIs

API Console API Fullscreen API Geolocation API History API MediaQueryList API Storage

HTML Objects

<a> <abbr> <address> <area> <article> <aside> <audio> <b> <base> <bdo> <blockquote> <body> <br> <button> <canvas> <caption> <cite> <code> <col> <colgroup> <datalist> <dd> <del> <details> <dfn> <dialog> <div> <dl> <dt> <em> <embed> <fieldset> <figcaption> <figure> <footer> <form> <head> <header> <h1> - <h6> <hr> <html> <i> <iframe> <img> <ins> <input> button <input> checkbox <input> color <input> date <input> datetime <input> datetime-local <input> email <input> file <input> hidden <input> image <input> month <input> number <input> password <input> radio <input> range <input> reset <input> search <input> submit <input> text <input> time <input> url <input> week <kbd> <label> <legend> <li> <link> <map> <mark> <menu> <menuitem> <meta> <meter> <nav> <object> <ol> <optgroup> <option> <output> <p> <param> <pre> <progress> <q> <s> <samp> <script> <section> <select> <small> <source> <span> <strong> <style> <sub> <summary> <sup> <table> <tbody> <td> <tfoot> <th> <thead> <tr> <textarea> <time> <title> <track> <u> <ul> <var> <video>

Other References

CSSStyleDeclaration JS Conversion


HTMLCollection item() Metodo

Esempio

Ottieni il contenuto HTML del primo elemento <p> di questo documento:

function myFunction() {
  var x = document.getElementsByTagName("P").item(0);
  alert(x.innerHTML);
}

Definizione e utilizzo

Il item()metodo restituisce l'elemento in corrispondenza dell'indice specificato in una HTMLCollection.

Gli elementi sono ordinati come appaiono nel codice sorgente e l'indice inizia da 0.

È possibile utilizzare anche un metodo di abbreviazione che produrrà lo stesso risultato:

var x = document.getElementsByTagName("P")[0];

Supporto browser

Method
item() Yes Yes Yes Yes Yes

Sintassi

HTMLCollection.item(index)
O:
HTMLCollection[index]

Valori dei parametri

Parameter Type Description
index Number Required. The index of the element you want to return.

Note: The index starts at 0


Valore di ritorno

Un oggetto Element , che rappresenta l'elemento in corrispondenza dell'indice specificato.

Restituisce null se il numero di indice non rientra nell'intervallo


Altri esempi

Esempio

Modifica il contenuto HTML del primo elemento <p>:

document.getElementsByTagName("P").item(0).innerHTML = "Paragraph changed";

Esempio

Scorri tutti gli elementi con class="myclass" e cambia il colore di sfondo:

var x = document.getElementsByClassName("myclass");

for (i = 0; i < x.length; i++) {
  x.item(i).style.backgroundColor = "red";
}

Esempio

Ottieni il contenuto HTML del primo elemento <p> all'interno di un elemento <div>:

var div = document.getElementById("myDIV");
var x = div.getElementsByTagName("P").item(0).innerHTML;

Pagine correlate

HTMLCollection: lunghezza della proprietà

Elemento HTML: metodo getElementsByClassName()

Elemento HTML: metodo getElementsByTagName()