jQuery and ASP.NET

April 27, 2009

Using JavaScript to DropDown an HTML Select on MouseOver




An HTML SELECT can be programmatically dropdown on MouseOver using JavaScript. On MouseOut, we can get the SELECT to its default positions. Here's how to do it

<html xmlns="http://www.w3.org/1999/xhtml">
<
head>
<
title>Drop on Hover</title>
<
script type="text/javascript">
function
DropList() {
var n = document.getElementById("sel").options.length;
document.getElementById("sel").size = n;
}
</script>
</
head>
<
body>
<
div>
<
select id="sel" onmouseover="DropList()" onmouseout="this.size=1;">
<
option>One</option>
<
option>Two</option>
<
option>Three</option>
<
option>Four</option>
<
option>Five</option>
<
option>Six</option>
<
option>Seven</option>
<
option>Eight</option>
</
select>
</
div>
</
body>
</
html>

See a Live Demo.

image

On Mouse Hover

image



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About The Author

Suprotim Agarwal, ASP.NET Architecture MVP works as an Architect Consultant and provides consultancy on how to design and develop Web applications.

Suprotim is also the founder and primary contributor to DevCurry, DotNetCurry and SQLServerCurry. He has also written an EBook 51 Recipes using jQuery with ASP.NET Controls.

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comments

5 Responses to "Using JavaScript to DropDown an HTML Select on MouseOver"
  1. Balaji said...
    August 26, 2009 2:45 PM

    Wow, I hadn't thought about it that way before. Good write up, very clearly written. Have you written previously about Using JavaScript to DropDown an HTML Select on MouseOver? I'd love to read more.

  2. Society for Handicapped said...
    August 27, 2009 9:59 AM
    This comment has been removed by the author.
  3. Anonymous said...
    August 27, 2009 10:00 AM

    Kinda backwards moving IMO just because the select element can't be easily styled cross browser. What I'm looking for is an elegant way of turning a div into a select box. Any takers?

  4. Anonymous said...
    August 27, 2009 10:50 AM

    I've just started using the mega-dropdown menu code from here: http://www.javascriptkit.com/script/script2/jScale/

    It lets you drop down a div with any contents just by hovering over something....

    It is jQuery-based.

  5. Anonymous said...
    January 22, 2011 4:05 AM

    This is very cool.

    1 suggestion:

    Could you make the "dropdown" drop over the other elements in the page rather than displace them.

    1 question:

    How could I apply this to multiple select boxes on a page - at the moment I've attempted to but only 1 responds.

 

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