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function tab_add(t, ti, ss, se) {
t.value = t.value.substr(0, ti) + "\t" + t.value.substr(ti);
t.selectionStart = ss + 1;
t.selectionEnd = se + 1;
}
function tab_remove(t, ti, ss, se) {
t.value = t.value.substr(0, ti-1) + t.value.substr(ti);
t.selectionStart = ss - 1;
t.selectionEnd = se - 1;
}
function textarea_handle_tab(t, e) {
if(navigator.userAgent.match("Gecko")) {
keyCode = e.which;
} else {
keyCode = e.keyCode;
}
if(keyCode != 9)
return;
e.preventDefault();
var ss = t.selectionStart;
var se = t.selectionEnd;
if(ss == se) {
if(e.shiftKey) {
if(t.value[ss-1] == "\t") {
tab_remove(t, ss, ss, se);
}
} else {
tab_add(t, ss, ss, se);
}
} else {
var s;
if(ss < se)
s = t.value.substr(ss, se - ss);
else
s = t.value.substr(se, ss - se);
if(s.indexOf("\n") > -1) {
var nl = s.lastIndexOf("\n");
if(e.shiftKey) {
while(nl > -1) {
if(s[nl+1] == "\t") {
tab_remove(t, ss + nl + 2, ss, se);
se--;
}
nl = s.lastIndexOf("\n", nl - 2);
}
if(t.value[(ss < se ? ss : se)-1] == "\n" && e.shiftKey)
tab_remove(t, ss+1, ss, se);
if((ss == 0 || se == 0) && t.value[0] == "\t")
tab_remove(t, 1, ss, se);
} else {
while(nl > -1) {
tab_add(t, ss + nl + 1, ss, se);
se++;
if(nl == 0)
break;
nl = s.lastIndexOf("\n", nl - 2);
}
if(ss == 0 || se == 0 || t.value[(ss < se ? ss : se)-1] == "\n")
tab_add(t, ss, ss-1, se);
}
} else {
var nl = t.value.lastIndexOf("\n", (ss < se ? se : ss) - 1) + 1;
if(e.shiftKey) {
if(t.value[nl] == "\t") {
tab_remove(t, nl + 1, ss, se);
}
} else {
tab_add(t, nl, ss, se);
}
}
}
setTimeout("document.getElementById('" + t.id + "').focus();", 0);
}
window.onload = function() {
text = document.getElementById("text");
text.onkeydown = function(event) {
return textarea_handle_tab(text, event);
}
}
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