virt2/api/soft/CodeMirror/demo/marker.html

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<!doctype html>
<title>CodeMirror: Breakpoint Demo</title>
<meta charset="utf-8"/>
<link rel=stylesheet href="../doc/docs.css">
<link rel="stylesheet" href="../lib/codemirror.css">
<script src="../lib/codemirror.js"></script>
<script src="../mode/javascript/javascript.js"></script>
<style>
.breakpoints {width: .8em;}
.breakpoint { color: #822; }
.CodeMirror {border: 1px solid #aaa;}
</style>
<div id=nav>
<a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a>
<ul>
<li><a href="../index.html">Home</a>
<li><a href="../doc/manual.html">Manual</a>
<li><a href="https://github.com/codemirror/codemirror">Code</a>
</ul>
<ul>
<li><a class=active href="#">Breakpoint</a>
</ul>
</div>
<article>
<h2>Breakpoint Demo</h2>
<form><textarea id="code" name="code">
var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
lineNumbers: true,
gutters: ["CodeMirror-linenumbers", "breakpoints"]
});
editor.on("gutterClick", function(cm, n) {
var info = cm.lineInfo(n);
cm.setGutterMarker(n, "breakpoints", info.gutterMarkers ? null : makeMarker());
});
function makeMarker() {
var marker = document.createElement("div");
marker.style.color = "#822";
marker.innerHTML = "●";
return marker;
}
</textarea></form>
<p>Click the line-number gutter to add or remove 'breakpoints'.</p>
<script>eval(document.getElementById("code").value);</script>
</article>