從這個例子嘗試的功能:
<script type="text/javascript">
// Function to add <tag>To Selected text</tag> in textarea with id of idelm
// Receives the tag name, and the id of textarea.
// Returns the selected text, with tag
function addTagSel(tag, idelm) {
// http://CoursesWeb.net/javascript/
var tag_type = new Array('<', '>'); // for BBCode tag, replace with: new Array('[', ']');
var txta = document.getElementById(idelm);
var start = tag_type[0] + tag + tag_type[1];
var end = tag_type[0] +'/'+ tag + tag_type[1];
var IE = /*@[email protected]*/false; // this variable is false in all browsers, except IE
if (IE) {
var r = document.selection.createRange();
var tr = txta.createTextRange();
var tr2 = tr.duplicate();
tr2.moveToBookmark(r.getBookmark());
tr.setEndPoint('EndToStart',tr2);
var tag_seltxt = start + r.text + end;
var the_start = txta.value.replace(/[\r\n]/g,'.').indexOf(r.text.replace(/[\r\n]/g,'.'),tr.text.length);
txta.value = txta.value.substring(0, the_start) + tag_seltxt + txta.value.substring(the_start + tag_seltxt.length, txta.value.length);
var pos = txta.value.length - end.length; // Sets location for cursor position
tr.collapse(true);
tr.moveEnd('character', pos); // start position
tr.moveStart('character', pos); // end position
tr.select(); // selects the zone
}
else if (txta.selectionStart || txta.selectionStart == "0") {
var startPos = txta.selectionStart;
var endPos = txta.selectionEnd;
var tag_seltxt = start + txta.value.substring(startPos, endPos) + end;
txta.value = txta.value.substring(0, startPos) + tag_seltxt + txta.value.substring(endPos, txta.value.length);
// Place the cursor between formats in #txta
txta.setSelectionRange((endPos+start.length),(endPos+start.length));
txta.focus();
}
return tag_seltxt;
}
</script>
<form name="my_form">
<textarea name="my_textarea" id="my_textarea">Sometext, abcd ... xyz, 123.</textarea><br />
<input type="button" value="code" onclick="addTagSel('tag', 'my_textarea');" />
</form>
@RobG怎麼樣格??? – MintY
JSFiddle在這裏會有所幫助。 – mavrosxristoforos
*無法調用未定義的方法'createRange'*您是否熟悉Web瀏覽器的「開發人員工具」?在大多數瀏覽器中,按「F12」,您將獲得開發人員工具,「控制檯」選項卡將顯示javascript錯誤(如上面的錯誤)。 – Snixtor