按钮在组合框菜单中不起作用

Question

我有一个组合框菜单。它是无按钮工作。我添加了一个按钮，但它不起作用。我想在点击按钮时运行。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>

Answer 1

使用"onclick“代替使用javascript添加href，添加以下内容：

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