Received value must be an htmlelement or an svgelement. received has value: null

The error message “received value must be an htmlelement or an svgelement. received has value: null” indicates that the value received is null when it is expected to be an HTML element or an SVG element.

To better understand this, let’s take a look at some examples:

Example 1: Accessing an HTML element

Suppose we have the following HTML code:

    
      <div id="myElement">Hello, world!</div>
    
  

We can access the above HTML element using JavaScript, as follows:

    
      const myElement = document.getElementById('myElement');
      console.log(myElement);
    
  

In this example, the variable myElement will hold a reference to the HTML <div> element. If the element does not exist, myElement will be null.

Example 2: Manipulating an HTML element

Once we have a reference to an HTML element, we can manipulate it. For instance:

    
      myElement.innerHTML = 'New content';
      myElement.style.color = 'blue';
    
  

The above code will modify the content of the element to “New content” and change its text color to blue.

Example 3: Handling null values

It is essential to handle the cases where the received value is null. For instance:

    
      if (myElement) {
        // Element exists, can proceed with manipulation
        myElement.innerHTML = 'New content';
      } else {
        // Element does not exist, handle the error
        console.error('Element not found.');
      }
    
  

In this example, we check if myElement is truthy (i.e., not null). If the element exists, we can proceed with manipulating it; otherwise, we handle the error by logging a message to the console.

Remember to always ensure that you have a valid reference to an HTML element before attempting to manipulate it to avoid encountering the “received value must be an htmlelement or an svgelement” error.