Javascript 按钮在组合框菜单中不起作用

我有一个组合菜单。这是没有按钮的工作。我添加了一个按钮，但它不工作。我想在单击按钮时运行。我对JavaScript一无所知。有人能帮我吗？谢谢

asd.php

$hello = $_POST['List3'];
echo $hello;

index.php

<script type="text/javascript">

/*
Triple Combo Script Credit
By Philip M: http://www.codingforums.com/member.php?u=186
Visit http://javascriptkit.com for this and over 400+ other scripts
*/

var categories = [];
categories["startList"] = ["Wearing Apparel","Books"]
categories["Wearing Apparel"] = ["Men","Women","Children"];
categories["Books"] = ["Biography","Fiction","Nonfiction"];
categories["Men"] = ["Shirts","Ties","Belts","Hats"];
categories["Women"] = ["Blouses","Skirts","Scarves", "Hats"];
categories["Children"] = ["Shorts", "Socks", "Coats", "Nightwear"];
categories["Biography"] = ["Contemporay","Historical","Other"];
categories["Fiction"] = ["Science Fiction","Romance", "Thrillers", "Crime"];
categories["Nonfiction"] = ["How-To","Travel","Cookbooks", "Old Churches"];

var nLists = 3; // number of select lists in the set

function fillSelect(currCat,currList){
var step = Number(currList.name.replace(/\D/g,""));
for (i=step; i<nLists+1; i++) {
document.forms['tripleplay']['List'+i].length = 1;
document.forms['tripleplay']['List'+i].selectedIndex = 0;
}
var nCat = categories[currCat];
for (each in nCat) {
var nOption = document.createElement('option'); 
var nData = document.createTextNode(nCat[each]); 
nOption.setAttribute('value',nCat[each]); 
nOption.appendChild(nData); 
currList.appendChild(nOption); 
} 
}

function getValue() {
    document.forms["tripleplay"].submit();
}

function init() {
fillSelect('startList',document.forms['tripleplay']['List1'])
}

navigator.appName == "Microsoft Internet Explorer" ? attachEvent('onload', init, false) : addEventListener('load', init, false);    

</script> 









<form name="tripleplay" action="asd.php" method="POST">
<select name='List1' onchange="fillSelect(this.value,this.form['List2'])">
<option selected>Make a selection</option>
</select>
&nbsp;
<select name='List2' onchange="fillSelect(this.value,this.form['List3'])">
<option selected>Make a selection</option>
</select>
&nbsp;
<select name='List3' onchange="getValue(this.value, this.form['List2'].value, 
this.form['List1'].value)">
<option selected >Make a selection</option>
</select>

      <center><a type="button" href="javascript: getValue()" class="btn btn-warning btn-lg">GÖNDER</a></center>


</form>

/*
三重组合脚本信用
菲利普M：http://www.codingforums.com/member.php?u=186
参观http://javascriptkit.com 对于此脚本和400多个其他脚本
*/
var类别=[]；
类别[“惊奇者”]=“服装”、“书籍”]
类别[“服装”]=“男性”、“女性”、“儿童”]；
类别[“书籍”]=“传记”、“小说”、“非小说”]；
类别[“男士”]=“衬衫”、“领带”、“腰带”、“帽子”]；
类别[“女性”]=[“衬衫”、“裙子”、“围巾”、“帽子”]；
类别[“儿童”]=“短裤”、“袜子”、“外套”、“睡衣”]；
类别[“传记”]=“当代”、“历史”、“其他”]；
类别[“小说”]=“科幻小说”、“浪漫小说”、“惊悚片”、“犯罪”]；
类别[“非小说”]=[“如何”、“旅行”、“食谱”、“旧教堂”]；
变量nLists=3；//集合中的选择列表数
函数fillSelect（currCat，currList）{
var step=Number（currList.name.replace（/\D/g，“”）；
对于（i=step；i而不是使用javascript“onclick”添加href），添加以下内容：

<a type="button" class="btn btn-warning btn-lg" onclick="getValue()">GONDER</a>

GONDER
你用Javascript而不仅仅是一个
GÖNDER
提交此表单有什么原因吗？你的
getValue（）
所做的似乎就是提交表单？我添加了
GÖNDER
并删除了
函数getValue（）
太好了！它正在工作。谢谢。很棒的东西，作为参考，假设您使用的是Bootstrap或类似的工具，您仍然可以将您的
class=“btn btn warning btn lg”
样式放在
上。