Посмотрите, как реализовано на форумском скрипте.
Или вот вариант.
| Код |
<form action="#">
<input type="button" value="B" onclick="pasteTag('B');" />
<input type="button" value="I" onclick="pasteTag('I');" />
<input type="button" value="U" onclick="pasteTag('U');" /><br />
<textarea id="tarea" name="tarea" cols="75" rows="15"></textarea>
</form>
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| Код |
function pasteTag(tag) {
var tarea = document.getElementById("tarea");
tarea.focus();
if (typeof tarea.selectionStart == "number") {
var selStart = tarea.selectionStart;
var selEnd = tarea.selectionEnd;
var selTxt = tarea.value.slice(selStart, selEnd);
var txt = "[" + tag + "]" + selTxt + "[/" + tag + "]";
tarea.value = tarea.value.slice(0, selStart) + txt + tarea.value.slice(selEnd);
tarea.selectionStart = selStart + ("[" + tag + "]").length;
tarea.selectionEnd = tarea.selectionStart + selTxt.length;
} else {
var rng = document.selection.createRange();
var txt = rng.text + "[/" + tag + "]";
rng.text = "[" + tag + "]" + txt;
rng.moveStart("character", -(txt.length));
rng.moveEnd("character", -(("[/" + tag + "]").length));
rng.select();
}
}
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