Append Style to DOM not Replacing Existing

javascript css dom dom-events

23,948

Solution 1

Which browser are you using? In Chrome, this works for me:

<html> 
<head> 
<style type="text/css"> 
  .test { background: #ff0000; font-family: "Verdana"; }
</style> 
<script type="text/javascript"> 
  function changeback(onoff)
  {
    if(onoff){
      document.getElementById("field1").style.background="#0f0";
    } else {
      document.getElementById("field1").style.background="#000";
    }
  }
 </script> 
 </head> 
 <body> 
   <h1>Test</h1> 
   <p id="field1" onclick="changeback(true);" class="test">This is a test</p> 
</body> 
</html>

When I click on the text, the background color changes, but the rest of the style (in this case, the font) stays the same.

Is that what you're trying to do?

Solution 2

Here is how you can do it :

var elem = document.getElementById('YOUR ELEMENT ID');
elem.style.setProperty('border','1px solid black','');

elem.style is an object implementing the CSSStyleDeclaration interface which supports a setProperty function. If you check the style property in Firebug now, you will notice addition of the border property within the style attribute of the element.

23,948

Author by

Mago Maverick

Software dude powered by challenge, complexity, ideas & collaboration.

Updated on July 09, 2022

Comments

Mago Maverick almost 2 years
How can I append style element to DOM without eliminating existing style on the item (eg color, text-align, etc)?

The event calls the function, but the problem is 'Style' gets completely replaced with the single item instead.

I have simple code triggered on the event:
```
function changeback(onoff) {
   if(onoff) {
      document.getElementById("field1").style.background="#fff";
   } else            
      document.getElementById("field1").style.background="#000";
}
```