Digit linkifier simple

by dipish

HTML

<h1>Digit linkifier simple</h1>
<p><i>Plain ol' textarea...</i></p>

<p class="toolbar">
    <button id="btn-0">0</button>
    <button id="btn-1">1</button>
    <button id="btn-2">2</button>
    <button id="btn-3">3</button>
    <button id="btn-4">4</button>
    <button id="btn-5">5</button>
    <button id="btn-6">6</button>
    <button id="btn-7">7</button>
    <button id="btn-8">8</button>
    <button id="btn-9">9</button>
</p>
<div id="myeditor" class="editor-wrapper">
<div class="editor" contenteditable>
    1 banana<br />
    2 banana<br />
    3 banana<br />
    four<br />
    4 make a bunch<br />
    and so do many more<br />
</div>
    
    
<div class="editor-ghost" contenteditable>
    1 banana<br />
    2 banana<br />
    3 banana<br />
    four<br />
    4 make a bunch<br />
    and so do many more<br />
</div>
</div>

CSS

* {
    box-sizing: border-box;
}
body {
    margin: 20px;
}

h1 {
    font-size: 2em;
    font-family: sans-serif;
    margin: 0.3em 0;
}

.editor-wrapper {
    position: relative;
    width: 400px;
    height: 200px;
}
.editor {
    border: solid 1px black;
    width: 100%;
    height: 100%;    
    padding: 5px;
    overflow: auto;
    line-height: 1.5;
}

    .editor a {
        background: rgb(169, 214, 255);
        text-decoration: none;
        padding: 0px 4px;
        margin: 1px;
        color: #000;
        border: solid 1px rgb(0, 122, 255);
        border-radius: 5px;
    }

.editor-ghost {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: solid 1px black;
    padding: 5px;
    z-index: -1;
    overflow: auto;
    line-height: 1.5;
}

.toolbar {
    margin-top: 10px;
}
    .toolbar button {
    
    }

    .toolbar .active {
        background: #55D155;
    }

JavaScript

var wrapper = $('#myeditor'),
    editor = wrapper.find('.editor'),
    ghost = wrapper.find('.editor-ghost'),
    usedDigits = {};
        

    
function detectDigits(s) {
    var res = s.match(/\d/g);
    usedDigits = {};
    if(res) {
        for(var i = 0, len = res.length; i < len; i++) {
            usedDigits[res[i]] = true;
        }
    }
}
    
function updateToolbar() {
    for(var i = 0; i < 10; i++) {
        $('#btn-' + i).toggleClass('active', !!usedDigits[i]);
    }
}
        
function refresh() {
     var html = editor.html();
     detectDigits(html);
     updateToolbar();
}

editor.on('keyup', function(e) {
    //ghost.html( linkify(editor.html()) );
    refresh();
});

// kickoff
refresh();

//editor.on('click', 'a', function() {console.log('link click!');})