<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: absolute; z-index: 10" id="t"></span> </td>
</tr>
</table>
</body>
</html>
