<div>
document.getElementById(&quot;o<wbr />bjectID&quot;).<wbr />className = &quot;newClassname&quot;;
</div>


document.getElementById("objectID").className = "newClassname";

<div>
<div class="content wysiwyg-content">
Hi there<br />
<br />
Wonder if you can help me, with a simple CSS/Javascript/HTML issue I have<br />
<br />
I have this HTML:<br />
<br />
&lt;style&gt;<br />
.book<br />
{<br />
&nbsp; color: black;<br />
&nbsp; font-size:10pt;<br />
}<br />
<br />
.book2<br />
{<br />
&nbsp; color: red;<br />
&nbsp; font-size:10pt;<br />
}<br />
&lt;/style&gt;<br />
<br />
&lt;table&gt;<br />
&nbsp; &lt;tr&gt;<br />
&nbsp; &nbsp; &lt;td class=&quot;book&quot;&gt;<br />
&nbsp; &nbsp; &nbsp; Book1<br />
&nbsp; &nbsp; &lt;/td&gt;<br />
&nbsp; &lt;tr&gt;<br />
&nbsp; &lt;tr&gt;<br />
&nbsp; &nbsp; &lt;td class=&quot;book&quot;&gt;<br />
&nbsp; &nbsp; &nbsp; Book2<br />
&nbsp; &nbsp; &lt;/td&gt;<br />
&nbsp; &lt;tr&gt;<br />
&nbsp; &lt;tr&gt;<br />
&nbsp; &nbsp; &lt;td class=&quot;book&quot;&gt;<br />
&nbsp; &nbsp; &nbsp; Book3<br />
&nbsp; &nbsp; &lt;/td&gt;<br />
&nbsp; &lt;tr&gt;<br />
&nbsp; &lt;tr&gt;<br />
&nbsp; &nbsp; &lt;td class=&quot;book&quot;&gt;<br />
&nbsp; &nbsp; &nbsp; Book4<br />
&nbsp; &nbsp; &lt;/td&gt;<br />
&nbsp; &lt;tr&gt;<br />
&lt;/table&gt;<br />
<br />
How can I change (swap) from class=&quot;book&quot; to use class=&quot;book2&quot; on the fly? i.e. using JavaScript<br />
<br />
<br />
Thanks<br />

</div>
</div>


Hi there

Wonder if you can help me, with a simple CSS/Javascript/HTML issue I have

I have this HTML:

<style>
.book
{
  color: black;
  font-size:10pt;
}

.book2
{
  color: red;
  font-size:10pt;
}
</style>

<table>
  <tr>
    <td class="book">
      Book1
    </td>
  <tr>
  <tr>
    <td class="book">
      Book2
    </td>
  <tr>
  <tr>
    <td class="book">
      Book3
    </td>
  <tr>
  <tr>
    <td class="book">
      Book4
    </td>
  <tr>
</table>

How can I change (swap) from class="book" to use class="book2" on the fly? i.e. using JavaScript


Thanks


Use a different CSS class on the fly

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.