JavaScript - 强制选择元素下拉？
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时间：2020-10-25 19:52:02 来源:igfitidea点击:
JavaScript - Force select element to dropdown?
提问by dpp
How can I force the select element to dropdown using Javascript? Is it possible?
如何使用 Javascript 强制选择元素下拉？是否可以？
<select id="MiamiPlayers">
<option value="0">Bosh</option>
<option value="1">Wade</option>
<option value="2">LeBron</option>
</select>
<input type="button" onclick="Show()" />
<script type="text/javascript">
function Show()
{
//force the select to dropdown...
}
</script>
Thanks in advance!
提前致谢！
采纳答案by Dinash
var select = document.getElementById(id);
select.size = select.options.length;
where id is the id of the your select box...
其中 id 是您选择框的 id ...
回答by Petah
You can't open the drop down, but you can do something like this:
您无法打开下拉菜单，但您可以执行以下操作：
document.getElementById('MiamiPlayers').setAttribute('size', 3);
