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How to change text inside all HTML tags using JavaScript

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How to change text inside all HTML tags using JavaScript

In this article, we will use JavaScript to perform the task of changing the text within all HTML tags. Let’s dive into this article to learn more about changing text in all HTML, but first, let’s define HTML tags.

What are HTML tags

HTML tag is a piece of markup language used to indicate the beginning and end of HTML elements in an HTML document. HTML tags are the building blocks of HTML elements that help web browsers convert HTML documents into web pages.

For better understanding use JavaScript to change the text inside all HTML tags. Let's look at the following example.

Example

In the example below, we will create a simple web page where we will change the text by running a script. 

<!DOCTYPE html>
<html>
   <body style="text-align:center;">
      <h2>
         Click on the button to change the text
      </h2>
      <label id = "tutorial">
         Welcome to Tutorialspoint
      </label>
      <br>
      <button onclick="changetext()">
         Click Here!
      </button>
      <script>
         function changetext() {
            var x = document.getElementById("tutorial");
            if (x.innerHTML === "Welcome to Tutorialspoint") {
               x.innerHTML = "The Best E-way Learning";
            } else {
               x.innerHTML = "Welcome to Tutorialspoint";
            }
         }
      </script>
   </body>
</html>

When the script executes, it will generate an output consisting of text and a clicked button. If the user clicks the button, the text will change and another text will appear on the web page.

Use replaceWith()

The

Element.replaceWith() method replaces the objects in this Element's parent's children list with a set of Node or string objects. Inserts the equivalent text node for a String object.

grammar

The following is the syntax of replaceWith() -

ChildNode.replaceWith(Node);

Example

Consider the following example where we use replaceWith() to change the text within a tag. 

<!DOCTYPE html>
<html>
   <body>
      <h2 id="tutorial">
      <span class="quotation">“</span>
      Lost in the ave of you
      <span class="quotation">”</span>
      </h2>
      <script>
         const changed = document.getElementById('tutorial');
         changed.childNodes[2].replaceWith('Welcome');
      </script>
   </body>
</html>

When you run the above script, an output window will pop up showing the text on the web page replaced with the original text used in the script.

Use querySelector()

When one or a set of selectors is provided, the Document method querySelector() returns the first Element in the document that matches them. Returns Null if there is no match.

grammar

The following is the syntax of querySelector()

querySelector(selectors)

Example

Execute the following code, we use querySelector() to change the text in the HTML tag. 

<!DOCTYPE html>
<html>
   <body>
      <h1>Welcome</h1>
      <script>
         document.querySelector("h1").textContent = 'Tutorialspoint';
      </script>
   </body>
</html>

When scripts are executed, they will produce an output containing the text from the web page replaced with the original text used in the markup.

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