<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=gb2312">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>光标位置</title>
<style>
INPUT{border: 1 solid #000000}
BODY,TABLE{font-size: 10pt}
</style>
</head>
<body>
<table border="0" width="700" cellspacing="0" cellpadding="0">
<tr>
<td width="479" rowspan="7">
点击 TextArea 实现光标定位
<p>
<textarea rows="7" cols="49" id="box" onclick=tellPoint()>我怕来不及我要抱着你,直到感觉你的绉纹有了岁月的痕迹,直到视线变得模糊直到不能呼吸
为了你我愿意
动也不能动也要看着你,直到感觉你的发线有了白雪的痕迹,直到肯定你是真的直到失去力气让我们形影不离
如果全世界我也可以放弃,至少还有你值得我去珍惜而你在这里就是生命的奇迹
也许全世界我也可以忘记,就是不愿意失去你的消息你掌心的痣我总记得在哪里
我们好不容易我们身不由已,我怕时间太快不够将你看仔细,我怕时间太慢日夜担心失去你恨不得一夜之间白头永不分离
</textarea>
<script>
function movePoint()
{
var pn = parseInt(pnum.value)
if(isNaN(pn))
return
var rng = box.createTextRange()
rng.moveStart("character",pn)
rng.collapse(true)
rng.select()
returnCase(rng)
}
function tellPoint()
{
var rng = event.srcElement.createTextRange()
rng.moveToPoint(event.x,event.y)
rng.moveStart("character",-event.srcElement.value.length)
pnum.value = rng.text.length
returnCase(rng)
}
function returnCase(rng)
{
bh.innerText = rng.boundingHeight
bl.innerText = rng.boundingLeft
bt.innerText = rng.boundingTop
bw.innerText = rng.boundingWidth
ot.innerText = rng.offsetTop
ol.innerText = rng.offsetLeft
t.innerText = rng.text
}
function selectText(sp,ep)
{
sp = parseInt(sp)
ep = parseInt(ep)
if(isNaN(sp)||isNaN(ep))
return
var rng = box.createTextRange()
rng.moveEnd("character",-box.value.length)
rng.moveStart("character",-box.value.length)
rng.collapse(true)
rng.moveEnd("character",ep)
rng.moveStart("character",sp)
rng.select()
returnCase(rng)
}
var rg = box.createTextRange()
function findText(tw)
{
if(tw=="")
return
var sw = 0
if(document.selection)
{
sw = document.selection.createRange().text.length
}
rg.moveEnd("character",box.value.length)
rg.moveStart("character",sw)
if(rg.findText(tw))
{
rg.select()
returnCase(rg)
}
if(rg.text!=tw)
{
alert("已经搜索完了")
rg = box.createTextRange()
}
}
</script>
</p>
<p></p>
光标位置:<input type="text" value="0" id="pnum" size="8"><input type="button" onclick="movePoint()" value="移动光标到指定位置">
<p></p>
选择指定范围:<input type="text" size="9" id="sbox">-- <input type="text" size="9" id="ebox"><input type="button" onclick="selectText(sbox.value,ebox.value)" value="选择">
<p></p>
选择查找字符 :<input type="text" value="" id="cbox" size="8"><input type="button" onclick="findText(cbox.value)" value="查找下一个并选择">
</td>
<td width="217">boundingHeight: <span id="bh"></span></td>
</tr>
<tr>
<td width="217">boundingWidth: <span id="bw"></span></td>
</tr>
<tr>
<td width="217">boundingTop: <span id="bt"></span></td>
</tr>
<tr>
<td width="217">boundingLeft: <span id="bl"></span></td>
</tr>
<tr>
<td width="217">offsetLeft: <span id="ol"></span></td>
</tr>
<tr>
<td width="217">offsetTop: <span id="ot"></span></td>
</tr>
<tr>
<td width="217">text: <span style="position: absolutez-index: 10" id="t"></span></td>
</tr>
</table>
</body>
</html>
利用contenteditable=”true”模拟输入框时,focus()方法会将光标定位在文本的首位,需要将光标挪到最后一位传入当前标签的节点对象(jquery对象)例: $("#addInput") ;