getElementByID.innerHTML is failing to change text

I am new to HTML and Javascript and I decided to try write a basic shopping cart.

I have a problem though. Why doesent this:

    if(totalItems == 0)
{

  document.getElementById('yourCartContains').innerHTML = "Your cart contains no items!";   
}

Change this:

<b id = "yourCartContains">0</b>

To say "your cart contains no items" instead of 0?

The function definitely works, because I have tried switching the function to show an alert and it does this without any problems - so function works, but for some reason the function does not change the text.

Here is the function with the alert (I even changed totalItems to 0 to prove function is being called):

var totalItems = 0;
if(totalItems == 0)
{
  alert("Random Alert is called upon function being executed");
  document.getElementById('yourCartContains').innerHTML = "Your cart contains no items!";   <!-- But this isnt -->
}

I am debugging in chrome.


Manipulating the DOM in JavaScript with innerText and innerHTML , Manipulating the DOM in JavaScript with innerText and innerHTML Take that React, Angular, Vue, and whatever hot new framework I failed to mention! To back it up a small bit, let's start by changing the text of an element  We have simply created a text that identifies with the id “d1”. Just open the text.html to check whether the text has begun showing on it or not. There it is! Create a Button. Let us now create a button that says “Change Text” in the body section. To create a button all you have to do is use a button tag with some input in it.


<script type="text/javascript">
    var totalItems = 0;
    if(totalItems == 0)
    {document.getElementById('yourCartContains').innerHTML = "Your cart contains no items!";}
  </script>
<span id="yourCartContains" style="font-weight:bold"></span>

Change text value with JavaScript but keep saying Cannot set , Change text value with JavaScript but keep saying Cannot set property 'value' of null. does not exists yet, and the getElement will return null, failing. not change its content, as the span "text" is its inner html, not the value. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML.


I have very painful experience using text to innerHTML. Since my text contains a lot of dynamic element (select2 for searching option list) and I forgot to put ending quote . The text looks fine, in some cases, however, the innerHTML truncate the "submit" button is missing. The text assigned to innerHTML is translate to other strange result automatically. if HTML syntax is not correct, it produces very weird string in innerHTML. the problem is intermittent, some case is fine, some are not good. Since project is big, I wasted whole night effort to fight to bug.

I finally figure a way to debug the dynamic element by using W3 validator (https://validator.w3.org/nu). copy and paste into a file and check the dynamic element syntax. There are some online HTML checker (https://www.freeformatter.com/html-validator.html).

TypeError: document.getelementbyid() is null, is null, The solution is that you need to put your JavaScript code after the closure If you change the order of the script after the element so that it's defined when getElementById is called. innerHTML = res; } When the browser initially loads HTML and comes across a script area in the text, it can't continue building DOM. The getElementById() method returns the element that has the ID attribute with the specified value. This method is one of the most common methods in the HTML DOM, and is used almost every time you want to manipulate, or get info from, an element on your document. Returns null if no elements with the specified ID exists.


This works for me. Have you loaded your script after your html?

<html>
    <head>


        <title>TODO supply a title</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
    </head>
    <body>
        <div><b id = "yourCartContains">0</b></div>


        <script>

           var totalItems = 0;
if(totalItems == 0)
{
  alert("Random Alert is called upon function being executed");
  document.getElementById('yourCartContains').innerHTML = "Your cart contains no items!";   <!-- But this isnt -->
} 


        </script>
    </body>
</html>

innerHTML problem - JavaScript, JavaScript can't update the innerHTML of a div that isn't in the web page. I am using firebug on Firefox but still unable to get whole HTML. type="text/css"/> <​script type="text/javascript" src="/NTrack1/struts/js/base/jquery-1.3.2.js"></script> Since the website does replace the HTML symbols please read following line: textContent returns the text content of all elements, while innerText returns the content of all elements, except for <script> and <style> elements. innerText will not return the text of elements that are hidden with CSS (textContent will). Try it » Tip: To set or return the HTML content of an element, use the innerHTML property.


HTML DOM innerHTML Property, Example. Change the HTML content of a <p> element with id="demo": document.​getElementById("demo").innerHTML = "Paragraph changed!";. Try it Yourself ». First, you must give the element you wish to change an id. With that id in place you will be able to use the getElementById function, which works on all browsers. After you have that set up you can now manipulate the text of an element. To start off, let's try changing the text inside a bold tag.


JavaScript: Changing Button's Text, Changing html content using JavaScript and CSS. If you try to change the text using innerHTML, IE6 will give : "Unknown Runtime Error;" and If that also fails, then it will use the innerHTML property (we use this as the last resort because  jQuery can be used to dynamically set the innertext or innerhtml of a web page to new content which could be text, images, hyperlinks or anything.


JavaScript Tutorial: The Basics, NOTE: In HTML4/XHTML, you need to include attribute type="text/javascript" to the (The property innerHTML is really useful and is supported in most of the browsers. You can change the type of a variable by re-assigning a value of another type. to a number that represents the object's value; or NaN if conversion fails. The Document method getElementById() returns an Element object representing the element whose id property matches the specified string. Since element IDs are required to be unique if specified, they're a useful way to get access to a specific element quickly.