blocks|key|1670445|text|你可以很容易地simulate+a+click+on+an+element，但是点击一个<select>不会打开下拉列表。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1670446|使用多个选择可能会有问题。也许您应该考虑容器元素中的单选按钮，您可以根据需要展开和收缩它。|1670447|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.jquery.com/Events/click^0|18|8|7|U|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

You can easily <a href="http://docs.jquery.com/Events/click" rel="noreferrer">simulate a click on an element</a>, but a click on a <code>&lt;select&gt;</code> won’t open up the dropdown.

Using multiple selects can be problematic. Perhaps you should consider radio buttons inside a container element which you can expand and contract as needed.

blocks|key|1455499|text|我也想找同样的东西，但我很失望。我最终更改了选择框的属性大小，使其显示为打开状态|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1455500|$('#countries').attr('size',6);|code-block|syntax|javascript|1455501|然后当你完成的时候|1455502|$('#countries').attr('size',1);|1455503|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I was trying to find the same thing and got disappointed.
I ended up changing the attribute size for the select box so it appears to open

<pre><code>$('#countries').attr('size',6);
</code></pre>

and then when you're finished

<pre><code>$('#countries').attr('size',1);
</code></pre>

blocks|key|1455854|text|这应该涵盖了它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1455855|+var+event;
+event+=+document.createEvent('MouseEvents');
+event.initMouseEvent('mousedown',+true,+true,+window);
+countries.dispatchEvent(event);+//we+use+countries+as+it's+referred+to+by+ID+-+but+this+could+be+any+JS+element+var|code-block|syntax|javascript|1455856|例如，这可以绑定到一个按键事件，这样当元素具有焦点时，用户可以输入，它将自动扩展……|1455857|--上下文--|1455858|++modal.find("select").not("[readonly]").on("keypress",+function(e)+{

+++++if+(e.keyCode+==+13)+{
+++++++++e.preventDefault();
+++++++++return+false;
+++++}
+++++var+event;
+++++event+=+document.createEvent('MouseEvents');
+++++event.initMouseEvent('mousedown',+true,+true,+window);
+++++this.dispatchEvent(event);
+});|1455859|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This should cover it:

<pre><code> var event;
 event = document.createEvent('MouseEvents');
 event.initMouseEvent('mousedown', true, true, window);
 countries.dispatchEvent(event); //we use countries as it's referred to by ID - but this could be any JS element var
</code></pre>

This could be bound for example to a keypress event, so when the element has focus the user can type and it will expand automatically...

--Context--

<pre><code> modal.find("select").not("[readonly]").on("keypress", function(e) {

 if (e.keyCode == 13) {
 e.preventDefault();
 return false;
 }
 var event;
 event = document.createEvent('MouseEvents');
 event.initMouseEvent('mousedown', true, true, window);
 this.dispatchEvent(event);
 });
</code></pre>

blocks|key|1670715|text|这是从上面的答案中整理出来的，并使用选项的长度/数量来符合实际有多少个选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1670716|希望这能帮助一些人得到他们需要的结果！|1670717|++++function+openDropdown(elementId)+{
++++++++function+down()+{
++++++++++++var+pos+=+$(this).offset();+//+remember+position
++++++++++++var+len+=+$(this).find("option").length;
++++++++++++++++if(len+>+20)+{
++++++++++++++++++++len+=+20;
++++++++++++++++}

++++++++++++$(this).css("position",+"absolute");
++++++++++++$(this).css("zIndex",+9999);
++++++++++++$(this).offset(pos);+++//+reset+position
++++++++++++$(this).attr("size",+len);+//+open+dropdown
++++++++++++$(this).unbind("focus",+down);
++++++++++++$(this).focus();
++++++++}
++++++++function+up()+{
++++++++++++$(this).css("position",+"static");
++++++++++++$(this).attr("size",+"1");++//+close+dropdown
++++++++++++$(this).unbind("change",+up);
++++++++++++$(this).focus();
++++++++}
++++++++$("#"+%2B+elementId).focus(down).blur(up).focus();
++++}|code-block|syntax|javascript|1670718|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This is spruced up from the answers just above and uses the length/number of options to conform to how many options there actually are.

Hope this helps somebody get the results they need!

<pre><code> function openDropdown(elementId) {
 function down() {
 var pos = $(this).offset(); // remember position
 var len = $(this).find("option").length;
 if(len &gt; 20) {
 len = 20;
 }

 $(this).css("position", "absolute");
 $(this).css("zIndex", 9999);
 $(this).offset(pos); // reset position
 $(this).attr("size", len); // open dropdown
 $(this).unbind("focus", down);
 $(this).focus();
 }
 function up() {
 $(this).css("position", "static");
 $(this).attr("size", "1"); // close dropdown
 $(this).unbind("change", up);
 $(this).focus();
 }
 $("#" + elementId).focus(down).blur(up).focus();
 }
</code></pre>

blocks|key|1670546|text|一种简单的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1670547|function+down(what)+{
++pos+=+$(what).offset();++//+remember+position
++$(what).css("position","absolute");
++$(what).offset(pos);+++//+reset+position
++$(what).attr("size","10");+//+open+dropdown
}

function+up(what)+{
$(what).css("position","static");
$(what).attr("size","1");++//+close+dropdown
}|code-block|syntax|javascript|1670548|现在你可以像这样调用你的DropDown|1670549|<select+onfocus="down(this)"+onblur="up(this)">|1670550|对我来说太完美了。|1670551|也许更好，因为您对页面上其他元素的位置没有问题。|1670552|function+down(was)+{
a+=+$(was).clone().attr('id','down_man').attr('disabled',true).insertAfter(was);
$(was).css("position","absolute").attr("size","10");
}

function+up(was)+{
$('#down_man').remove();
$(was).css("position","static");
$(was).attr("size","1");
}|1670553|将ID更改为固定值可能不太明智，但我希望您能看到该值。|1670554|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

Simple an easy way. 

<pre><code>function down(what) {
 pos = $(what).offset(); // remember position
 $(what).css("position","absolute");
 $(what).offset(pos); // reset position
 $(what).attr("size","10"); // open dropdown
}

function up(what) {
$(what).css("position","static");
$(what).attr("size","1"); // close dropdown
}
</code></pre>

Now you can call your DropDown just like this

<pre><code>&lt;select onfocus="down(this)" onblur="up(this)"&gt;
</code></pre>

Works perfect for me. 

Maybe better, because you have no problems with the position of the other elemts on the page.

<pre><code>function down(was) {
a = $(was).clone().attr('id','down_man').attr('disabled',true).insertAfter(was);
$(was).css("position","absolute").attr("size","10");
}

function up(was) {
$('#down_man').remove();
$(was).css("position","static");
$(was).attr("size","1");
}
</code></pre>

Change the ID to a fix value mybe not smart but i hope you see the idee.

blocks|key|1455393|text|javascript不可能“点击”一个元素(你可以触发附加的onclick事件，但你不能直接点击它)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1455394|要查看列表中的所有项目，请将列表设置为multiple列表并增加其大小，如下所示：|1455395|<select+id="countries"+multiple="multiple"+size="10">
<option+value="1">Country</option>
</select>|code-block|syntax|javascript|1455396|entityMap^0|U|7|0|J|8|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

It is not possible for javascript to "click" on an element (u can trigger the attached <code>onclick</code> event, but you can't literally click it)

To view all the items in the list, make the list a <code>multiple</code> list and increase its size, like such:

<pre><code>&lt;select id="countries" multiple="multiple" size="10"&gt;
&lt;option value="1"&gt;Country&lt;/option&gt;
&lt;/select&gt;
</code></pre>

blocks|key|1670465|text|不你不能。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1670466|您可以更改大小以使其更大。类似于Dreas的想法，但它是你需要改变的大小。|1670467|<select+id="countries"+size="6">
++<option+value="1">Country+1</option>
++<option+value="2">Country+2</option>
++<option+value="3">Country+3</option>
++<option+value="4">Country+4</option>
++<option+value="5">Country+5</option>
++<option+value="6">Country+6</option>
</select>|code-block|syntax|javascript|1670468|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

No you can't.

You can change the size to make it larger... similar to Dreas idea, but it is the size you need to change.

<pre><code>&lt;select id="countries" size="6"&gt;
 &lt;option value="1"&gt;Country 1&lt;/option&gt;
 &lt;option value="2"&gt;Country 2&lt;/option&gt;
 &lt;option value="3"&gt;Country 3&lt;/option&gt;
 &lt;option value="4"&gt;Country 4&lt;/option&gt;
 &lt;option value="5"&gt;Country 5&lt;/option&gt;
 &lt;option value="6"&gt;Country 6&lt;/option&gt;
&lt;/select&gt;
</code></pre>

blocks|key|1455618|text|我试着使用完美先生的答案，但我遇到了一些小故障。只要做几个小改动，我就能让它为我工作了。我只是改变了它，让它只做一次。一旦您退出dropdown，它将返回到常规的dropdown方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1455619|function+down()+{
++++var+pos+=+$(this).offset();+//+remember+position
++++$(this).css("position",+"absolute");
++++$(this).offset(pos);+++//+reset+position
++++$(this).attr("size",+"15");+//+open+dropdown
++++$(this).unbind("focus",+down);
}
function+up()+{
++++$(this).css("position",+"static");
++++$(this).attr("size",+"1");++//+close+dropdown
++++$(this).unbind("change",+up);
}
function+openDropdown(elementId)+{
++++$('#'+%2B+elementId).focus(down).blur(up).focus();
}|code-block|syntax|javascript|1455620|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I tried using mrperfect's answer and i had a couple glitches. With a couple small changes, I was able to get it to work for me. I just changed it so that it would only do it once. Once you exit dropdown, it would go back to the regular method of dropdowns. 

<pre><code>function down() {
 var pos = $(this).offset(); // remember position
 $(this).css("position", "absolute");
 $(this).offset(pos); // reset position
 $(this).attr("size", "15"); // open dropdown
 $(this).unbind("focus", down);
}
function up() {
 $(this).css("position", "static");
 $(this).attr("size", "1"); // close dropdown
 $(this).unbind("change", up);
}
function openDropdown(elementId) {
 $('#' + elementId).focus(down).blur(up).focus();
}
</code></pre>

blocks|key|1670639|text|这里没有回答的一件事是，在完成size+=n并将其设置为绝对定位后，当您单击选择列表中的一个选项时会发生什么。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1670640|由于blur事件将其size设置为1并将其更改回外观，因此您也应该具有如下所示的内容|1670641|$("option").click(function(){
++++$(this).parent().blur();
});|code-block|syntax|javascript|1670642|此外，如果您对显示在其他元素后面的绝对定位选择列表有问题，只需将一个|1670643|z-index:+100;|1670644|或者类似于select风格的东西。|1670645|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

One thing that this doesn't answer is what happens when you click on one of the options in the select list after you have done your size = n and made it absolute positioning.

Because the blur event makes it size = 1 and changes it back to how it looks, you should have something like this as well

<pre><code>$("option").click(function(){
 $(this).parent().blur();
});
</code></pre>

Also, if you're having issues with the absolute positioned select list showing behind other elements, just put a 

<pre><code>z-index: 100;
</code></pre>

or something like that in the style of the select.

blocks|key|1670754|text|超级简单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1670755|var+state+=+false;
$("a").click(function+()+{
++++state+=+!state;
++++$("select").prop("size",+state+?+$("option").length+:+1);
});|code-block|syntax|javascript|1670756|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Super simple:

<pre><code>var state = false;
$("a").click(function () {
 state = !state;
 $("select").prop("size", state ? $("option").length : 1);
});
</code></pre>

blocks|key|1670839|text|我刚添加了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1670840|select+=+$('#'+%2B+id);
length+=+$('#'+%2B+id+%2B+'+>+option').length;
if+(length+>+20)
++++length+=+20;
select.attr('size',+length);
select.css('position',+'absolute');
select.focus();|code-block|syntax|javascript|1670841|并添加到select中|1670842|onchange="$(this).removeAttr('size');"
onblur="$(this).removeAttr('size');"|1670843|使外观与经典外观相同(与html的其余部分重叠)|1670844|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

i just added

<pre><code>select = $('#' + id);
length = $('#' + id + ' &gt; option').length;
if (length &gt; 20)
 length = 20;
select.attr('size', length);
select.css('position', 'absolute');
select.focus();
</code></pre>

and add into the select

<pre><code>onchange="$(this).removeAttr('size');"
onblur="$(this).removeAttr('size');"
</code></pre>

to make the same appearance like the classic one
(overlap the rest of html)

blocks|key|1455826|text|也许很晚了，但我是这样解决的：http://jsfiddle.net/KqsK2/18/|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1455827|$(document).ready(function()+{
++fixSelect(document.getElementsByTagName("select"));
++++++++++++++++++++++});+++++++++++++++++++++++

+++function+fixSelect(selectList)
++++++++++++{
++++++++++++for+(var+i+=+0;+i+!=+selectList.length;+i%2B%2B)
++++++++++++++{

+++++++++++++++++setActions(selectList[i]);
++++++++++++++}
++++++++++++}


+++function+setActions(select)
++++++++++++{
+++++++++++++++$(select).click(function()+{
+++++++++++++++++++if+(select.getElementsByTagName("option").length+==+1)
++++++++++++++++++++++++{
++++++++++++++++++++++++++active(select);
++++++++++++++++++++++++}
++++++++++++++++++++++});
++++++++++++++++$(select).focus(function()+{
+++++++++++++++++++++++active(select);
+++++++++++++++++++++++});
++++++++++++++++$(select).blur(function()+{
+++++++++++++++++++++++inaktiv(select);
+++++++++++++++++++++++});
++++++++++++++++$(select).keypress(function(e)+{
++++++++++++++++++++++if+(e.which+==+13)+{

++++++++++++++++++++++inaktiv(select);
++++++++++++++++++++++++++}
+++++++++++++++++++++++});
++++++++++++++++++var+optionList+=+select.getElementsByTagName("option");

++++++++++++++++++for+(var+i+=+0;+i+!=+optionList.length;+i%2B%2B)
+++++++++++++++++++++++++++{
++++++++++++++++++++++++++++++++setActionOnOption(optionList[i],+select);
+++++++++++++++++++++++++++}
++++++}

++function+setActionOnOption(option,+select)
++++++{
++++++++++++++++++++$(option).click(function()+{
++++++++++++++++++++++++++++++++inaktiv(select);
++++++++++++++++++++++++});
++++++}

++function+active(select)
++++++{
++++++++++var+temp+=+$('<select/>');
++++++++++++++$('<option+/>',+{value:+1,text:$(select).find(':selected').text()}).appendTo(temp);
+++++++++++++++$(temp).insertBefore($(select));

++++++++++++++$(select).attr('size',+select.getElementsByTagName('option').length);
++++++++++++++$(select).css('position',+'absolute');
++++++++++++++$(select).css('margin-top',+'-6px');
++++++++++++++$(select).css({boxShadow:+'2px+3px+4px+#888888'});



++++++++++++++++++++++++}

++++++++function+inaktiv(select)
+++++++++++++++++++{
+++++++++++++++++if($(select).parent().children('select').length!=1)
+++++++++++++++++++++{
+++++++++++++++++++++++++++++++++++++++++++++select.parentNode.removeChild($(select).parent().children('select').get(0));
++++++++++++++++++++++++++++++++}
++++++++++++++++$(select).attr('size',+1);
++++++++++++++++$(select).css('position',+'static');
++++++++++++++++$(select).css({boxShadow:+''});
++++++++++++++++$(select).css('margin-top',+'0px');

++++++++++++++++++}|code-block|syntax|javascript|1455828|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/KqsK2/18/^0|F|T|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Maybe late, but this is how i solved it:
<a href="http://jsfiddle.net/KqsK2/18/" rel="nofollow">http://jsfiddle.net/KqsK2/18/</a>

<pre><code>$(document).ready(function() {
 fixSelect(document.getElementsByTagName("select"));
 }); 

 function fixSelect(selectList)
 {
 for (var i = 0; i != selectList.length; i++)
 {

 setActions(selectList[i]);
 }
 }


 function setActions(select)
 {
 $(select).click(function() {
 if (select.getElementsByTagName("option").length == 1)
 {
 active(select);
 }
 });
 $(select).focus(function() {
 active(select);
 });
 $(select).blur(function() {
 inaktiv(select);
 });
 $(select).keypress(function(e) {
 if (e.which == 13) {

 inaktiv(select);
 }
 });
 var optionList = select.getElementsByTagName("option");

 for (var i = 0; i != optionList.length; i++)
 {
 setActionOnOption(optionList[i], select);
 }
 }

 function setActionOnOption(option, select)
 {
 $(option).click(function() {
 inaktiv(select);
 });
 }

 function active(select)
 {
 var temp = $('&lt;select/&gt;');
 $('&lt;option /&gt;', {value: 1,text:$(select).find(':selected').text()}).appendTo(temp);
 $(temp).insertBefore($(select));

 $(select).attr('size', select.getElementsByTagName('option').length);
 $(select).css('position', 'absolute');
 $(select).css('margin-top', '-6px');
 $(select).css({boxShadow: '2px 3px 4px #888888'});



 }

 function inaktiv(select)
 {
 if($(select).parent().children('select').length!=1)
 {
 select.parentNode.removeChild($(select).parent().children('select').get(0));
 }
 $(select).attr('size', 1);
 $(select).css('position', 'static');
 $(select).css({boxShadow: ''});
 $(select).css('margin-top', '0px');

 }
</code></pre>

For this dropdownlist in HTML:

<pre><code>&lt;select id="countries"&gt;
&lt;option value="1"&gt;Country&lt;/option&gt;
&lt;/select&gt;
</code></pre>

I would like to open the list (the same as left-clicking on it). Is this possible using JavaScript (or more specifically jQuery)?

Can I open a dropdownlist using jQuery

容器

jQuery

对于HTML格式的下拉列表：<select id="countries"><option value="1">Country</option></select>我想打开这个列表(和左键点击一样)。使用JavaScript (或者更具体地说，jQuery)可以做到这一点吗？

问我可以使用jQuery打开下拉列表吗
EN

回答 12

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问我可以使用jQuery打开下拉列表吗EN

回答 12

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问我可以使用jQuery打开下拉列表吗
EN