Smileys无法在文本框中显示php codeigniter

Question

我使用下面的代码在javascript中将文本转换为表情符号，

function add_smile($text) {
    var $text=$text;
    function RegExpEscape(text) {
    return text.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&"); 
}

var emoticons = {
    ':)'         : 'images/smileys/angry.gif',
    ':('         : 'images/smileys/sad.gif',
    ';)'         : 'images/smileys/wink.gif'
}

var result =$text;
var emotcode;
var regex;

for (emotcode in emoticons)
{
    regex = new RegExp(RegExpEscape(emotcode), 'gi');
    result = result.replace(regex, function(match) {
        var pic = emoticons[match.toLowerCase()];

        if (pic != undefined) {
              return '<img src="' + pic + '"/>';
        } else {
            return match;
        }
    });
}
    $('#editor-textarea').val($('#editor-textarea').val() + " " + result);
}

在我看来，

<textarea name="content" class="editor-textarea" id="editor-textarea">
</textarea>

<?php foreach($smiles as $k=>$v) : ?>
    <button type="button" class="nobutton" onclick="add_smile('<?php echo $k ?>')"><?php echo $v ?></button>
<?php endforeach; ?>

javascript函数现在用<img src="images/smileys/angry.gif">替换文本，因为文本不显示为图像。如何解决此问题？