JavaScript实现下拉列表框数据增加、删除、上下排序的方法

本文实例讲述了JavaScript实现下拉列表框数据增加、删除、上下排序的方法。分享给大家供大家参考。具体如下:

这里实现在一个支持多选的下拉列表框内进行数据项的添加、删除、向上、向下移动操作,我们在一些人才网站或是编程技术站经常会看到这种功能,比较实用。

运行效果截图如下:

具体代码如下:

<title>下拉列表数据上下排序</title>

<SCRIPT LANGUAGE="JavaScript">

<!-- Begin

function move(fbox,tbox) {

var i = 0;

if(fbox.value != "") {

var no = new Option();

no.value = fbox.value;

no.text = fbox.value;

tbox.options[tbox.options.length] = no;

fbox.value = "";

}

}

function remove(box) {

for(var i=0; i<box.options.length; i++) {

if(box.options[i].selected && box.options[i] != "") {

box.options[i].value = "";

box.options[i].text = "";

}

}

BumpUp(box);

}

function BumpUp(abox) {

for(var i = 0; i < abox.options.length; i++) {

if(abox.options[i].value == "") {

for(var j = i; j < abox.options.length - 1; j++) {

abox.options[j].value = abox.options[j + 1].value;

abox.options[j].text = abox.options[j + 1].text;

}

var ln = i;

break;

}

}

if(ln < abox.options.length) {

abox.options.length -= 1;

BumpUp(abox);

}

}

function Moveup(dbox) {

for(var i = 0; i < dbox.options.length; i++) {

if (dbox.options[i].selected && dbox.options[i] != "" && dbox.options[i] != dbox.options[0]) {

var tmpval = dbox.options[i].value;

var tmpval2 = dbox.options[i].text;

dbox.options[i].value = dbox.options[i - 1].value;

dbox.options[i].text = dbox.options[i - 1].text

dbox.options[i-1].value = tmpval;

dbox.options[i-1].text = tmpval2;

}

}

}

function Movedown(ebox) {

for(var i = 0; i < ebox.options.length; i++) {

if (ebox.options[i].selected && ebox.options[i] != "" && ebox.options[i+1] != ebox.options[ebox.options.length]) {

var tmpval = ebox.options[i].value;

var tmpval2 = ebox.options[i].text;

ebox.options[i].value = ebox.options[i+1].value;

ebox.options[i].text = ebox.options[i+1].text

ebox.options[i+1].value = tmpval;

ebox.options[i+1].text = tmpval2;

}

}

}

// End -->

</script>

<form ACTION="" METHOD="POST">

<table>

<tr>

<td>

<input type="button" value="增加" onclick="move(this.form.list1,this.form.list2)" name="B1"><br>

<input type="button" value="删除" onclick="remove(this.form.list2)" name="B2"><br>

<input type="button" value="向上" onclick="Moveup(this.form.list2)" name="B3"><br>

<input type="button" value="向下" onclick="Movedown(this.form.list2)" name="B4">

</td>

<td>

<select multiple size=7 name="list2">

<option value="one">ASP</option>

<option value="two">PHP</option>

<option value="three">ASP.NET</option>

<option value="four">JAVA</option>

<option value="five">DELPHI</option>

</select>

</td>

</tr>

<tr>

<td>

<input type="text" name="list1" value="">

</td></tr>

</table>

</form>

希望本文所述对大家的javascript程序设计有所帮助。

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