How can I change the page's URL when a visitor clicks a button?

When a visitor clicks a button element, how can I change the URL?

Example:

<form id="search">
  <input type="text" />
  <button onclick="javascript:alert('hi');">Alert Hi</button>
  <button onclick="javascript:window.location.href='http://www.google.com/'">Go to Google</button>
</form>

(Or see JSFiddle.)

For a quick demo page, I just need to send the visitor to a new URL when they click a button. I can execute JavaScript onclick (in the Alert Hi button), and the URL changes if I execute window.location.href='http://www.google.com/' from Firebug's console. What do I need to do to change the URL on a button click?

The problem is that the form is being submitted when you click on the button. Add type="button" so it doesn't submit the form. You also don't need javascript in the onclick attribute. See How to prevent buttons from submitting forms

Example http://jsfiddle.net/E7UEe/1/ Notice that it won't go to google.com because jsfiddle has disallowed it. Notice the error message Refused to display document because display forbidden by X-Frame-Options.

<form id="search">
  <input type="text" />
  <button onclick="javascript:alert('hi');">Alert Hi</button>
  <button type="button" onclick="window.location.href='http://www.google.com/'">Go to Google</button>
</form>​

An alternative that works without JS is the appearance:button CSS directive http://jsfiddle.net/d6gWA/

<a class="btn"> Link looking like button</a>​
.btn {
    appearance: button;
    -moz-appearance: button;
    -webkit-appearance: button;
    -ms-appearance: button;
}​

Or you could always put the button in a link http://jsfiddle.net/d6gWA/2/

<a class="btn" href="http://www.google.com" target="_blank"><button type="button">Link Button</button></a>​