티스토리 뷰

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function insertAtCursor(areaId,text)
{
    var txtarea = document.getElementById(areaId);
    var scrollPos = txtarea.scrollTop;
    var strPos = 0;
    var br = ((txtarea.selectionStart || txtarea.selectionStart == '0') ?
        "ff" : (document.selection ? "ie" : false ) );
    if (br == "ie") {
        txtarea.focus();
        var range = document.selection.createRange();
        range.moveStart ('character', -txtarea.value.length);
        strPos = range.text.length;
    }
    else if (br == "ff") strPos = txtarea.selectionStart;
 
    var front = (txtarea.value).substring(0,strPos);
    var back = (txtarea.value).substring(strPos,txtarea.value.length);
    txtarea.value=front+text+back;
    strPos = strPos + text.length;
    if (br == "ie") {
        txtarea.focus();
        var range = document.selection.createRange();
        range.moveStart ('character', -txtarea.value.length);
        range.moveStart ('character', strPos);
        range.moveEnd ('character', 0);
        range.select();
    }
    else if (br == "ff") {
        txtarea.selectionStart = strPos;
        txtarea.selectionEnd = strPos;
        txtarea.focus();
    }
    txtarea.scrollTop = scrollPos;
}
[출처] stackoverflow
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