Access DOM on JavaScript

javascript dom examples
javascript dom methods
javascript get element by id value
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I'm trying to get the textContent of a a tag inside an ul tags. The problem is that when I access the console returns me "null" instead of the element. I don't know what I am doing wrong. Hope you ca help me and thanks.

HTML code

JS code

On other hand, the console returns me HTMLColletion but I can't get anything from there because I don't know the syntax to get the things from there, all I get is "undefined".

<div class="dropdown">
         <ul class="navbar-nav mr-auto ">

            <li class="nav-item">
                <a id="resumen" class="nav-link dropdown-toggle" href="#" data-toggle="dropdown"> Productos 0 | Precio 0€ </a>
                <ul id="productos" class="dropdown-menu">


                </ul>

            </li>

         </ul>
</div>

The JS:

var resumen2 = document.getElementsByClassName("nav-link dropdown-toggle");
var resumen =  document.getElementById("resumen");
console.log(resumen);
console.log(resumen2.textContent);

Put your script tag at the end of the body, or add a defer attribute to it.

JavaScript HTML DOM, What is a parent object in DOM hierarchy in JavaScript? The DOM defines a standard for accessing documents: "The W3C Document Object Model (DOM) is a platform and language-neutral interface that allows programs and scripts to dynamically access and update the content, structure, and style of a document." The W3C DOM standard is separated into 3 different parts: Core DOM - standard model for all document types.

This is because getElementsByClassName returns a NodeList object, not an Element object.

Use resumen2[0].textContent to get the content of your element.

var resumen2 = document.getElementsByClassName("nav-link dropdown-toggle");
var resumen =  document.getElementById("resumen");
console.log(resumen);
console.log(resumen2[0].textContent);
<div class="dropdown">
         <ul class="navbar-nav mr-auto ">

            <li class="nav-item">
                <a id="resumen" class="nav-link dropdown-toggle" href="#" data-toggle="dropdown"> Productos 0 | Precio 0€ </a>
                <ul id="productos" class="dropdown-menu">


                </ul>

            </li>

         </ul>
</div>

Introduction to the DOM, What are the different ways to get an element from Dom? The DOM provides everything necessary to access the contents of an HTML page. It allows you to access and manipulate data it contains as well as much more.

document.getElementByClassName return a node list.

<div class="dropdown">
         <ul class="navbar-nav mr-auto ">

            <li class="nav-item">
                <a id="resumen" class="nav-link dropdown-toggle" href="#" data-toggle="dropdown"> Productos 0 | Precio 0€ </a>
                <ul id="productos" class="dropdown-menu">


                </ul>

            </li>

         </ul>
</div>
<script>
var resumen2 = document.getElementsByClassName("nav-link dropdown-toggle")[0];
var resumen =  document.getElementById("resumen");
console.log('resumen',resumen);
console.log('resumen2.textContent', resumen2.textContent);
</script>

is a parent object in dom hierarchy in javascript​, The HTML DOM can be accessed with JavaScript (and with other programming languages). In the DOM, all HTML elements are defined as objects. The  Tutorial 1: Accessing the DOM. This tutorial will teach you how to access the DOM from JavaScript. Basic knowledge of JavaScript and HTML is assumed. There are five short lessons, followed by one exercise. It is highly recommended that you open your browser's JavaScript console now.

Please check the below domo,

https://jsfiddle.net/jf60754y/

HTML Code:

  <html>
    <head>
    <title>Get a tag text</title>
    <body>
     <a id="gettext" href="#">hellow Mr shiva</a>
    </body>
    </html>

JS Code:

<script type="text/javascript">
document.getElementById('gettext').innerHTML
</script>

As per you js code,

innerHTML not available folowwed by the document.getElementById('resumen')

Accessing Elements in the DOM in Javascript, That is to say, it's written in JavaScript, but it uses the DOM to access the document and its elements. The DOM is  Typically you want to access an element within the DOM directly and try to do something with it. Javascript provides a document.getElementById() method, which is the easiest way to access an element from the DOM tree structure. It will return the element that has the ID attribute with the specified value.

not available right now. Please try again later. Published on Aug 1, 2016. Accessing the DOM Duration: 10:13 Posted: 1 Aug 2016 The Legacy DOM − This is the model which was introduced in early versions of JavaScript language. It is well supported by all browsers, but allows access only to certain key portions of documents, such as forms, form elements, and images.

Typically you want to access an element within the DOM directly and try to do something with it. Javascript provides a document.getElementById() method, which is  I have a webpage where there is a texarea within a iframe. I need to read the value of this textarea from its child page javascript. Presently by using window.parent.getelementbyID().value in the

var adults = 1; var children = 1; var costAdults = [180,120,80]; //stored prices for adults for each tour in an array var costChildren = [155,120,70];  The DOM Programming Interface. The HTML DOM can be accessed with JavaScript (and with other programming languages). In the DOM, all HTML elements are defined as objects. The programming interface is the properties and methods of each object. A property is a value that you can get or set (like changing the content of an HTML element).

Comments
  • Paste your code in your post directly.
  • here it is, sorry.
  • document.getElementById("resumen").textContent? You don't need to grab the elements by class and the element by id if the element with the id is the one you want.
  • Thank you so much Steven Spungin, appreciated.
  • You did not show the script tag in your example. Did this solve the problem?
  • Yes, well you solve it, thank you. Only was need it to put the script tag on html on the bottom.