Javascript用bbcode标签包裹文本？

Question

is there anyway to wrap textarea text with tags ? Javascript/Jquery

B = Bold I = Italic U = Underline S = Strike

For example:

-+-+-+-+-
 B I U S
-+-+-+-+-
<textarea>
 Some text here
</textarea>

When i highlight "here" and then click on bold its will be smth like this.

-+-+-+-+-
 B I U S
-+-+-+-+-
<textarea>
 Some text [b]here[/b]
</textarea>

Hope i will find solution and this is it thanks.

Answer 1

this is the solution

function wrapText(elementID, openTag, closeTag) {
    var textArea = $('#' + elementID);
    var len = textArea.val().length;
    var start = textArea[0].selectionStart;
    var end = textArea[0].selectionEnd;
    var selectedText = textArea.val().substring(start, end);
    var replacement = openTag + selectedText + closeTag;
    textArea.val(textArea.val().substring(0, start) + replacement + textArea.val().substring(end, len));
}

Answer 2

useage

console.log(parseBB('[b]hello [/b][u]world[/u]'));
console.log(parseBB(document.getElementById('textareaID').value));
console.log(parseBB($('#textareaID').val()));

test case

$('#output-container').html(parseBB($('#textareaID').val()));

..

function parseBB(string){
var _string = string.replace(/\n/g, '<br>'),
parseExp = new RegExp(/^(.*)\[(b|u|i|s)\]([A-Za-z0-9 ._-]+)\[\/[a-z]+\](.*)$/g);

(function run(){
    if(parseExp.test(_string)){
        _string = _string.replace(parseExp , '$1<$2>$3</$2>$4');
        run();
    }
})();
return _string;
}