| 内容 |
function getcaret(textbox)
{
var control = document.activeelement;
textbox.focus();
var rang = document.selection.createrange();
rang.setendpoint(starttostart,textbox.createtextrange())
control.focus();
return rang.text.length;
}
function setcaret(textbox,pos)
{
try
{
var r =textbox.createtextrange();
r.movestart('character',pos);
r.collapse(true);
r.select();
}
catch(e)
{}
}
function selectlength(textbox,start,len)
{
try
{
var r =textbox.createtextrange();
r.moveend('character',len-(textbox.value.length-start));
r.movestart('character',start);
r.select();
}
catch(e)
{//alert(e.description)}
}
function insertatcaret(textbox,text)
{
textbox.focus();
document.selection.createrange().text = text;
}
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