Javascript 如何在onfocus（）上打开HTML select标记的选项列表
我的HTML代码如下所示：Javascript 如何在onfocus（）上打开HTML select标记的选项列表,javascript,html,jquery,html-select,jquery-events,Javascript,Html,Jquery,Html Select,Jquery Events,我的HTML代码如下所示： <select id = "demo2"> <option value = "---select---">---select---</option> <option value = "1">Oranges</option> <option value = "2">A
<select id = "demo2">
<option value = "---select---">---select---</option>
<option value = "1">Oranges</option>
<option value = "2">Apples</option>
<option value = "3">Pears</option>
<option value = "4">Kiwis</option>
<option value = "5">Bananas</option>
<option value = "6">Banansasas</option>
<option value = "7">Grapes</option>
</select>
如何打开onfocus事件上选择标记的选项列表？在您的代码中，您可以将此代码select id=demo2与此代码select id=demo2 onfocus=MyFunction一起放置，然后突出显示您的选项。HTML 完整的要求代码，如此问题。仅供参考 1. 2. 3. 4. 5. 1. 2. 3. 4. 5.
选项列表UI的机制取决于浏览器和/或操作系统，无法通过Javascript进行控制。如果您想要更多的控制，请用CSS菜单替换，也许可以使用Select2之类的插件。@Barmar请您提供与Select2I相关的链接或示例，我非常同意@Barmar@Barmar仅供参考这是一个不寻常的要求。应该有办法做到这一点。myList.open在其他框架中是典型的。Tagging@W3Cand还将样式代码添加到uper头函数myFunctionx{x.style.background=yellow；}downvoted中-OP在哪里提到突出显示或更改select语句的背景色？我们鼓励链接到外部资源，但请在链接周围添加上下文，以便您的其他用户了解它是什么以及为什么存在。始终引用重要链接中最相关的部分，以防目标站点无法访问或永久脱机。@DevlshOne您的演示出现问题。.jsidle不起作用。按tab键遍历元素，确保Jquery库已导入html
<select id = "demo2">
<option disabled="true" selected="true" value = "---select---">---select---</option>
<option value = "1">Oranges</option>
<option value = "2">Apples</option>
<option value = "3">Pears</option>
<option value = "4">Kiwis</option>
<option value = "5">Bananas</option>
<option value = "6">Banansasas</option>
<option value = "7">Grapes</option>
</select>
$('#demo2').on('focus',function() {
var optCount = $(this).children('options').length;
$(this).attr('size', optCount);
});
$(document).ready(function(){
$('select').focus(function(){
$(this).attr("size",$(this).attr("expandto"));
var x = "select[tabindex='" + (parseInt($(this).attr('tabindex'),10) + 1) + "']";
$(x).fadeTo(50,0);
});
$('select').blur(function(){
$(this).attr("size",1);
var x = "select[tabindex='" + (parseInt($(this).attr('tabindex'),10) + 1) + "']";
$(x).fadeTo('fast',1.0);
});
});
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Auto-expand SELECT</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
$(document).ready(function () {
$('select').focus(function () {
$(this).attr("size", $(this).attr("expandto"));
});
$('select').blur(function () {
$(this).attr("size", 1);
});
$('select option').click(function () {
$(this).parent().attr("size", 1);
$(this).parent().val(this.value);
});
$('select').live('keypress', function (e) {
var key = e.which;
if (key == 13) // the enter key code
{
$(this).attr("size", 1);
}
});
});
</script>
<style type="text/css">
select{position:absolute}
.selectHolder{position:relative; height:45px}
h4{margin:10px 0;}
h5{margin:50px 0 0 0; text-align:center; font-weight:normal }
</style>
</head>
<body>
<div style="margin:30px auto; width:400px; border:1px #888 solid; padding:20px; background-color:#F8F4F0">
<h3 style="text-align:center">Tab In, To Open Select Box</h3><br/><br/>
<form>
<input style="width:230px" type="text" name="start" value="Start here then tab to next input" tabindex="1" /><br/><br/>
<h4>One to Seven</h4>
<div class="selectHolder">
<select class="select" size="1" expandto="7" tabindex="2">
<option value="1" selected="selected">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
<option value="4">Four</option>
<option value="5">Five</option>
<option value="6">Six</option>
<option value="7">Seven</option>
</select>
</div>
<h4>One to Ten</h4>
<div class="selectHolder" >
<select class="select" size="1" expandto="10" tabindex="3">
<option value="1" selected="selected">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
<option value="4">Four</option>
<option value="5">Five</option>
<option value="6">Six</option>
<option value="7">Seven</option>
<option value="8">Eight</option>
<option value="9">Nine</option>
<option value="10">Ten</option>
</select>
</div>
<h4>One to Four</h4>
<div class="selectHolder tab4">
<select class="select" size="1" expandto="4" tabindex="4">
<option value="1" selected="selected">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
<option value="4">Four</option>
</select>
</div>
<h4>One to Dog</h4>
<div class="selectHolder tab4">
<select class="select" size="1" expandto="5" tabindex="5">
<option value="1" selected="selected">One</option>
<option value="2">BAT</option>
<option value="3">BIRD</option>
<option value="4">CAT</option>
<option value="5">DOG</option>
</select>
</div>
</form>
</div>
</body>
</html>
$(document).ready(function(e) {
$('#selectBox').focus(function() {
$(this).attr('size',4);
$(this).css('position',"absolute");
$(this).css('x-index',"1000");
});
$('#selectBox').blur(function() {
$(this).attr('size',1);
$(this).css('position',"relative");
$(this).css('x-index',"0");
});
$('#selectBox2').focus(function() {
$(this).attr('size',4);
$(this).css('position',"absolute");
$(this).css('x-index',"1000");
});
$('#selectBox2').blur(function() {
$(this).attr('size',1);
$(this).css('position',"relative");
$(this).css('x-index',"0");
});
});