javascript中createTextRange用法

返回createTextRange的text和htmlText
<script language="javascript">
function getSelectionHtml() {
var selectedText = "";
if (typeof window.getSelection != "undefined") {
selectedText = window.getSelection();
} else if (typeof document.getSelection != "undefined") {
selectedText = document.getSelection();
} else if (typeof document.selection != "undefined") {
selectedText = document.selection.createRange().text;
}
alert(selectedText);
}</script>
<input type="button" _disibledevent=>
<input type="button" _disibledevent=>
页面文本倒序查找
abababababababa
<input value="倒序查找a" _disibledevent=>
<script language ='javascript'>
var rng = document.body.createTextRange();
function myfindtext(text)
{
rng.collapse(false);
if(rng.findText(text,-1,1))
{
rng.select();
rng.collapse(true);
}else
{alert("end");}
}
</script>
聚焦控件后把光标放到最后
<script language="javascript">
function setFocus()
{
var obj = event.srcElement;
var txt =obj.createTextRange();
txt.moveStart('character',obj.value.length);
txt.collapse(true);
txt.select();
}
</script>
<input type="text" value="http://toto369.net" _disibledevent=>
得到文本框内光标位置
<script language="javascript">
function getPos(obj){
obj.focus();
var s=document.selection.createRange();
s.setEndPoint("StartToStart",obj.createTextRange())
alert(s.text.length);
}
</script>
<input type="text" id="txt1" value="1234567890">
<input type="button" value="得到光标位置" _disibledevent=>
控制input框内光标位置
<script language="javascript">
function setPos(num)
{
text1.focus();
var e =document.getElementById("text1");
var r =e.createTextRange();
r.moveStart('character',num);
r.collapse(true);
r.select();
}
</script>
<input type="text" id="text1" value="1234567890">
<select _disibledevent=>
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
</select>
选中文本框中的一段文字
<script language=javascript>
function sel(obj,num)
{
var rng=obj.createTextRange()
var sel = rng.duplicate();
sel.moveStart("character", num);
sel.setEndPoint("EndToStart", rng);
sel.select();
}
</script>
<input type="text" id="text1" value="1234567890">
<select _disibledevent=>
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
</select>
控制文本框内光标的移动
<input type="button" value="<" _disibledevent=>
<input id="demo" value="这里是文字">
<input type="button" value=">" _disibledevent=>
<script language="javascript">
function go(n){
demo.focus();
with(document.selection.createRange())
{
moveStart("character",n);
collapse();
select();
}
}
</script>

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