1 // CodeMirror, copyright (c) by Marijn Haverbeke and others
2 // Distributed under an MIT license: http://codemirror.net/LICENSE
5 if (typeof exports == "object" && typeof module == "object") // CommonJS
6 mod(require("../../lib/codemirror"));
7 else if (typeof define == "function" && define.amd) // AMD
8 define(["../../lib/codemirror"], mod);
9 else // Plain browser env
11 })(function(CodeMirror) {
12 CodeMirror.defineOption("placeholder", "", function(cm, val, old) {
13 var prev = old && old != CodeMirror.Init;
15 cm.on("blur", onBlur);
16 cm.on("change", onChange);
18 } else if (!val && prev) {
19 cm.off("blur", onBlur);
20 cm.off("change", onChange);
22 var wrapper = cm.getWrapperElement();
23 wrapper.className = wrapper.className.replace(" CodeMirror-empty", "");
26 if (val && !cm.hasFocus()) onBlur(cm);
29 function clearPlaceholder(cm) {
30 if (cm.state.placeholder) {
31 cm.state.placeholder.parentNode.removeChild(cm.state.placeholder);
32 cm.state.placeholder = null;
35 function setPlaceholder(cm) {
37 var elt = cm.state.placeholder = document.createElement("pre");
38 elt.style.cssText = "height: 0; overflow: visible";
39 elt.className = "CodeMirror-placeholder";
40 elt.appendChild(document.createTextNode(cm.getOption("placeholder")));
41 cm.display.lineSpace.insertBefore(elt, cm.display.lineSpace.firstChild);
45 if (isEmpty(cm)) setPlaceholder(cm);
47 function onChange(cm) {
48 var wrapper = cm.getWrapperElement(), empty = isEmpty(cm);
49 wrapper.className = wrapper.className.replace(" CodeMirror-empty", "") + (empty ? " CodeMirror-empty" : "");
51 if (empty) setPlaceholder(cm);
52 else clearPlaceholder(cm);
55 function isEmpty(cm) {
56 return (cm.lineCount() === 1) && (cm.getLine(0) === "");