问题

I have a (hidden) html select object in my menu attached to a menu button link, so that clicking the link shows the list so you can pick from it.

When you click the button, it calls some javascript to show the <select>. Clicking away from the <select> hides the list. What I really want is to make the <select> appear fully expanded, as if you had clicked on the "down" arrow, but I can't get this working. I've tried lots of different approaches, but can't make any headway. What I'm doing currently is this:

<li>
    <a href="javascript:showlist();"><img src="/images/icons/add.png"/>Add favourite</a>
    <select id="list" style="display:none; onblur="javascript:cancellist()">
    </select>
</li>

// in code
function showlist() {
    //using prototype not jQuery
    $('list').show();  // shows the select list
    $('list').focus(); // sets focus so that when you click away it calles onblur()
}

I've tried calling $('list').click().
I've tried setting onfocus="this.click()" But in both cases I'm getting

Uncaught TypeError: Object # has no method 'click'

which is peculiar as link text says that it supports the standard functions.

I've tried setting the .size = .length which works, but doesn't have the same appearance (as when you click to open the element, it floats over the rest of the page.)

Does anyone have any suggestions?

回答1:

I've come across the same problem, wanted to implement keyboard navigation in my app, but select elements were not expanded, so people using the keyboard were going to lose functionality. I've created ExpandSelect() function which emulates mouse clicks on select elements, it does so by creating another <select> with multiple options visible at once by setting the size attribute, the code is hosted on Google Code website, ExpandSelect.js is only 4 KB, see screenshots and download it here:

http://code.google.com/p/expandselect/

Screenshots

There is a little difference in GUI when emulating click, but it does not really matter, see it for yourself:

When mouse clicking:

_{(source: googlecode.com)}

When emulating click:

_{(source: googlecode.com)}

More screenshots on project's website, link above.

回答2:

Here a simple solution, AUTO-EXPANDED select menu (all options visible)

<select name="ddlTestSelect" id="ddlTestSelect" style="width:200px;position:absolute;">
  <option selected="selected" value="0">defaulttt</option>
  <option>option 2</option>
  <option>option 3</option>
  <option>option 4</option>
</select>
<script type="text/javascript">
 var slctt=document.getElementById("ddlTestSelect");
 slctt.size=slctt.options.length;if(slctt.options.length>1)slctt.style.width='470px';
</script>

回答3:

You have a syntax error. It should be:

$('#list').click();

You forgot the #

回答4:

Please try this:

function showlist() {
    //using prototype not jQuery
    $('#list').show();  // shows the select list
    $('#list').focus(); // sets focus so that when you click away it calles onblur()
}

回答5:

The simplest way is to use the "multiple" attribute in HTML

<select multiple></select>

and you could also add a style attribute to set the height of the list

<select multiple style="height:150px;"></select>

来源：https://stackoverflow.com/questions/2923600/how-to-automatically-expand-html-select-element-in-javascript

标签

javascript

html

select

expand

How to automatically expand html select element in javascript