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JavaScript Essentials (10) HTML DOM-changing HTML

Source: Internet
Author: User
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The HTML DOM allows JavaScript to change the contents of an HTML element.

A. Change the HTML output stream

JavaScript is able to create dynamic HTML content:

Today's date is: Thu Oct 11:14:18 gmt+0800 (CST)

In JavaScript, document.write () can be used to write content directly to the HTML output stream.



?? <! DOCTYPE html>document.write (Date ()); </script></body>
?? Never use document.write () after the document has finished loading. This overwrites the document. 

 
  
 
B. Change HTML Content
The simplest way to modify HTML content is to use the InnerHTML property.
To change the contents of an HTML element, use this syntax:
document.getElementById (ID). innerhtml= new HTML
 1  This example changes the <p> 2  3  <p id= "P1" >hello world!</p> 4  6  document.getElementById ("P1"). innerhtml= "New text!"  7  </script> 
1 This example changes the contents of the   2 <! DOCTYPE html> 3  4 <body> 5  6 
 7  8 <script> 9var element=document.getelementbyid ("header" ); Ten element.innerhtml= "new title";  </script> </body> 
Explain:

 
 
    
  
  
       
   
    1. The above HTML document contains the  
      2. 
   
    2. Use HTML DOM to get id= "header" elements
      3.  
   
    3. JavaScript changes the contents of this element (InnerHTML)
      4.  
  
    
 
 

 
  
 
C. Change HTML Properties
To change the attributes of an HTML element, use this syntax:
document.getElementById (ID). attribute= new Attribute value
This example changes the SRC attribute of the  element:
1 <! DOCTYPE html> 2  3 <body> 4  5  6  7 <script> 8 document.getElementById (" image "). src=" Landscape.jpg "; 9 </script> </body> 
Example Explanation:

 
 
    
  
  
       
   
    • The above HTML document contains the elements of the id= "image"
      •  
   
    • We use the HTML DOM to get the elements of the id= "image"
      •  
   
    • JavaScript changes the attributes of this element (change "smiley.gif" to "landscape.jpg")
      •  
  
    
 
 
 JavaScript Essentials (10) HTML DOM-changing HTML 
 

                

                    
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