Codemirror Multiple Buffer Split View Demo

.CodeMirror {border: 1px solid black; height: 250px;}

CodeMirror

Home Manual Code

Multiple Buffer & Split View

Multiple Buffer & Split View Demo

Select buffer: New buffer

Select buffer: New buffer

var sel_top = document.getElementById("buffers_top"); CodeMirror.on(sel_top, "change", function() { selectBuffer(ed_top, sel_top.options[sel_top.selectedIndex].value); });

var sel_bot = document.getElementById("buffers_bot"); CodeMirror.on(sel_bot, "change", function() { selectBuffer(ed_bot, sel_bot.options[sel_bot.selectedIndex].value); });

var buffers = {};

function openBuffer(name, text, mode) { buffers[name] = CodeMirror.Doc(text, mode); var opt = document.createElement("option"); opt.appendChild(document.createTextNode(name)); sel_top.appendChild(opt); sel_bot.appendChild(opt.cloneNode(true)); }

function newBuf(where) { var name = prompt("Name for the buffer", "*scratch*"); if (name == null) return; if (buffers.hasOwnProperty(name)) { alert("There's already a buffer by that name."); return; } openBuffer(name, "", "javascript"); selectBuffer(where == "top" ? ed_top : ed_bot, name); var sel = where == "top" ? sel_top : sel_bot; sel.value = name; }

function selectBuffer(editor, name) { var buf = buffers[name]; if (buf.getEditor()) buf = buf.linkedDoc({sharedHist: true}); var old = editor.swapDoc(buf); var linked = old.iterLinkedDocs(function(doc) {linked = doc;}); if (linked) { // Make sure the document in buffers is the one the other view is looking at for (var name in buffers) if (buffers[name] == old) buffers[name] = linked; old.unlinkDoc(linked); } editor.focus(); }

function nodeContent(id) { var node = document.getElementById(id), val = node.textContent || node.innerText; val = val.slice(val.match(/^\s*/)[0].length, val.length - val.match(/\s*$/)[0].length) + "\n"; return val; } openBuffer("js", nodeContent("script"), "javascript"); openBuffer("css", nodeContent("style"), "css");

var ed_top = CodeMirror(document.getElementById("code_top"), {lineNumbers: true}); selectBuffer(ed_top, "js"); var ed_bot = CodeMirror(document.getElementById("code_bot"), {lineNumbers: true}); selectBuffer(ed_bot, "js");

Demonstration of using linked documents to provide a split view on a document, and using swapDoc to use a single editor to display multiple documents.