bbc code

Beispiel weie man Bbccode in einen Textfeld einbaut
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Der hier verwendete Code

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    <body style="max-width:600px;display:flex;flex-direction:column">
<script>
function bbcode(bb,c) {
   var field = document.getElementById("message");
    if (document.getSelection) {
        var startPos = field.selectionStart;
        var endPos = field.selectionEnd;
        var txt = field.value.substring(startPos, endPos);
        if (txt != "") {
            if(c==1){
                var cp= `<span style="color:${bb}">${txt}</span>`;
            }
            if(bb=='b'){
                var cp = `<span style="font-weight:900">${txt}</span>`;
            }
            if(bb=='u'){
                var cp = `<span style="text-decoration:underline">${txt}</span>`;
            }  
            if(bb=='h1'){
                var cp = `<span style="font-size:30px">${txt}</span>`;
            }      
            if(bb=='i'){
                var cp = `<span style="font-family: cursive">${txt}</span>`;
            }     
            field.value = field.value.substring(0, startPos) + cp +
            field.value.substring(endPos, field.length);
        }else {
            if(c==1){
              var cp= `<span style="color:${bb}">${txt}</span>`;
            }
            if(bb=='b'){
              var cp = `<span style="font-weight:900">${txt}</span>`;
            }
            if(bb=='link'){
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