本文实例讲述了JavaScript控制两个列表框listbox左右交换数据的方法。分享给大家供大家参考。具体分析如下：
这个功能我们经常用到，将左边列表框的元素移动到右边，或者将右边列表框的元素移动到左边，可以一次性全部移动
function listbox_moveacross(sourceID, destID) {
var src = document.getElementById(sourceID);
var dest = document.getElementById(destID);
for(var count=0; count < src.options.length; count++) {
if(src.options[count].selected == true) {
var option = src.options[count];
var newOption = document.createElement("option");
newOption.value = option.value;
newOption.text = option.text;
newOption.selected = true;
try {
dest.add(newOption, null); //Standard
src.remove(count, null);
}catch(error) {
dest.add(newOption); // IE only
src.remove(count);
}
count--;
}
}
}
//..
listbox_moveacross('countryList', 'selectedCountryList');
下面是像是的演示效果代码，可以直接在浏览器内执行
Click below buttons to move selected options right or left.<br>
<table>
<tbody><tr>
<td>
<select id="sourceSelect" size="10" multiple="">
<option value="a">Afghanistan</option>
<option value="b">Bahamas</option>
<option value="c">Barbados</option>
<option value="d">Belgium</option>
<option value="e">Bhutan</option>
<option value="f">China</option>
<option value="g">Croatia</option>
<option value="h">Denmark</option>
<option value="i">France</option>
</select>
</td>
<td>
<button onclick="listboxMoveacross('sourceSelect', 'destSelect');">>></button> <br>
<button onclick="listboxMoveacross('destSelect', 'sourceSelect');"><<</button>
</td>
<td>
<select id="destSelect" size="10" multiple="">
<option value="a">Afghanistan</option>
<option value="b">Bahamas</option>
<option value="c">Barbados</option>
<option value="d">Belgium</option>
<option value="e">Bhutan</option>
<option value="f">China</option>
<option value="g">Croatia</option>
<option value="h">Denmark</option>
<option value="i">France</option>
</select>
</td>
</tr>
</tbody></table>
<script>
function listboxMoveacross(sourceID, destID) {
var src = document.getElementById(sourceID);
var dest = document.getElementById(destID);
for(var count=0; count < src.options.length; count++) {
if(src.options[count].selected == true) {
var option = src.options[count];
var newOption = document.createElement("option");
newOption.value = option.value;
newOption.text = option.text;
newOption.selected = true;
try {
dest.add(newOption, null); //Standard
src.remove(count, null);
}catch(error) {
dest.add(newOption); // IE only
src.remove(count);
}
count--;
}
}
}
</script>
希望本文所述对大家的javascript程序设计有所帮助。
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