<script language="javascript" type="text/javascript">
function up()
{
var count=getId("p1").options.length;
var m=getId("p1").selectedIndex
if(0==m)
{
alert("已经是第一项了");
return
}
for(var i=0;i<count;i++)
getId("p1").options[i].selected =false;
getId("p1").options[m-1].selected =true;
}
function getId(id)
{return document.getElementById(id);}
function next()
{
var count=getId("p1").options.length;
var m=getId("p1").selectedIndex
if(count==m+1)
{
alert("已经是最后一项了");
return
}
for(var i=0;i<count;i++)
getId("p1").options[i].selected =false;
getId("p1").options[m+1].selected =true;
}
</script>
<select size="10" multiple id="p1">
<option>a</option>
<option>b</option>
<option>c</option>
</select>
<input type="button" value="上移" onclick="up()">
<input type="button" value="下移" onclick="next()">
function up()
{
var count=getId("p1").options.length;
var m=getId("p1").selectedIndex
if(0==m)
{
alert("已经是第一项了");
return
}
for(var i=0;i<count;i++)
getId("p1").options[i].selected =false;
getId("p1").options[m-1].selected =true;
}
function getId(id)
{return document.getElementById(id);}
function next()
{
var count=getId("p1").options.length;
var m=getId("p1").selectedIndex
if(count==m+1)
{
alert("已经是最后一项了");
return
}
for(var i=0;i<count;i++)
getId("p1").options[i].selected =false;
getId("p1").options[m+1].selected =true;
}
</script>
<select size="10" multiple id="p1">
<option>a</option>
<option>b</option>
<option>c</option>
</select>
<input type="button" value="上移" onclick="up()">
<input type="button" value="下移" onclick="next()">
解决方案 »
- 用html写的算法
- Jquery 动态添加input标签,并且给value赋值,但是值有空格,就会出现如下错误
- fullcalendar事件如何加载?
- jQuery控制radio问题
- 请教JS问题
- 嵌入的页面登陆时,刷新主页面的问题(附带详细描述),哪位大哥给看下啊,非常感谢了!
- 有没有办法不通过鼠标右键另存为直接实现对HTTP协议下的文件下载
- 如何判断控件的可见性**************
- 下拉列表与输入文本框联动问题,单选按钮与行或列联动问题,单选按钮与下拉列表框连动问题(在线等待)(高分求代码,能实现者给300分)
- 一个表格问题,可能有点难度
- 请教:javascript中怎么实现点击一下按钮就弹出一张图片
- 新人请教一个 校验日期 着急用
我的意思是说,把选中的Option往上移,或往下移
<option value="1">a</option>
<option value="2">b</option>
<option value="3">c</option>
</select>
<input type=button value=下移当前项 onclick="javascript:moveDown();" />
<input type=button value=上移当前项 onclick="javascript:moveUp();" /><script type="text/javascript">
<!--
var slc = document.getElementById("slc");
var o, o2;
var l = slc.options.length;
function moveDown() {
if (l == 0) return;
var sid = slc.selectedIndex;
if (sid == l - 1) return;
o = slc.options[sid];
o2 = slc.options[sid + 1];
slc.options[sid] = new Option(o2.innerHTML, o2.value);
slc.options[sid+1] = o;
}
function moveUp() {
if (l == 0) return;
var sid = slc.selectedIndex;
if (sid == 0) return;
o = slc.options[sid];
o2 = slc.options[sid-1];
slc.options[sid] = new Option(o2.innerHTML, o2.value);
slc.options[sid-1] = o;
}
-->
</script>
<option value=1>aaaaaa
<option value=2>bbbbbb
<option value=3>cccccc
<option value=4>dddddd
<option value=5>eeeeee
<option value=6>ffffff
<option value=7>gggggg
<option value=8>hhhhhh
</select>
<input type=button name=b1 value=向上 onClick="up()">
<input type=button name=b2 value=向下 onClick="down()">
<input type=button name=b3 value=查看 onClick="show()">
<script>
function up() {
s = document.all.s1;
v = new Array();
for(i=0;i<s.length-1;i++) {
if(! s.options[i].selected && s.options[i+1].selected) {
v.value = s.options[i].value;
v.text = s.options[i].text;
v.selected = s.options[i].selected;
s.options[i].value = s.options[i+1].value;
s.options[i].text = s.options[i+1].text;
s.options[i].selected = s.options[i+1].selected;
s.options[i+1].value = v.value;
s.options[i+1].text = v.text;
s.options[i+1].selected = v.selected;
}
}
}
function down() {
s = document.all.s1;
v = new Array();
for(i=s.length-1;i>0;i--) {
if(! s.options[i].selected && s.options[i-1].selected) {
v.value = s.options[i].value;
v.text = s.options[i].text;
v.selected = s.options[i].selected;
s.options[i].value = s.options[i-1].value;
s.options[i].text = s.options[i-1].text;
s.options[i].selected = s.options[i-1].selected;
s.options[i-1].value = v.value;
s.options[i-1].text = v.text;
s.options[i-1].selected = v.selected;
}
}
}
function show() {
s = document.all.s1;
v = "";
for(i=0;i<s.length;i++)
v += s.options[i].value + ":" + s.options[i].text + "\n";
alert(v);
}
</script>
我刚在别人的帖子里找到的
原作者 xuzuning(唠叨)