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JavaScript sub method

In the JavaScript, sub() method is used to format text in subscript format.



JavaScript sub method


In the JavaScript, sub() method is used to format text in subscript format. It creates a copy of string and then embed it within <sub></sub> tags as in HTML. It is very useful when we have to show the mathematical expressions (e.g logyX etc.)



It returns the copy of string in the subscript format e.g. Hello would be displayed in the format like Hello.

Description of code:

Here we have created an input text and a button. We have to supply string into the input text to convert it into subscript format. Click on the button to call the function subscriptText() as defined in the JavaScript within the <script></script> tags. It takes the text string into a variable textToSubscript and there after we have converted the string into subscript format by calling method sub() on the string reference object. Here is the full HTML code as follows :

Description of Code:

      Convert string to subscript
   <script language="JavaScript">
     function subscriptText()
	var textToStrike = document.getElementById('txt').value;
	document.write("<p> Subscript text "+
<div style="background: #ff9900; width:'100%';" align="center">
  <font color="#0000ff" size="12pt">
	<b>sub() Example</b>
Insert any text <input type="text" id="txt" /><br>
<input type="button" value="Convert text to subscript" 
     onClick="return subscriptText();"/>


Input text and click on the "Convert text to subscript" button.

As you can see that text "subscript" is printed in the document in the subscript format.

Download Source Code



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JavaScript sub method

Posted on: April 3, 2006 If you enjoyed this post then why not add us on Google+? Add us to your Circles



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