| 1 | // CodeMirror, copyright (c) by Marijn Haverbeke and others |
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| 2 | // Distributed under an MIT license: http://codemirror.net/LICENSE |
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| 3 | |
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| 4 | (function(mod) { |
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| 5 | if (typeof exports == "object" && typeof module == "object") // CommonJS |
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| 6 | mod(require("../../lib/codemirror")); |
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| 7 | else if (typeof define == "function" && define.amd) // AMD |
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| 8 | define(["../../lib/codemirror"], mod); |
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| 9 | else // Plain browser env |
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| 10 | mod(CodeMirror); |
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| 11 | })(function(CodeMirror) { |
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| 12 | CodeMirror.defineOption("placeholder", "", function(cm, val, old) { |
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| 13 | var prev = old && old != CodeMirror.Init; |
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| 14 | if (val && !prev) { |
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| 15 | cm.on("blur", onBlur); |
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| 16 | cm.on("change", onChange); |
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| 17 | onChange(cm); |
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| 18 | } else if (!val && prev) { |
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| 19 | cm.off("blur", onBlur); |
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| 20 | cm.off("change", onChange); |
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| 21 | clearPlaceholder(cm); |
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| 22 | var wrapper = cm.getWrapperElement(); |
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| 23 | wrapper.className = wrapper.className.replace(" CodeMirror-empty", ""); |
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| 24 | } |
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| 25 | |
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| 26 | if (val && !cm.hasFocus()) onBlur(cm); |
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| 27 | }); |
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| 28 | |
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| 29 | function clearPlaceholder(cm) { |
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| 30 | if (cm.state.placeholder) { |
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| 31 | cm.state.placeholder.parentNode.removeChild(cm.state.placeholder); |
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| 32 | cm.state.placeholder = null; |
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| 33 | } |
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| 34 | } |
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| 35 | function setPlaceholder(cm) { |
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| 36 | clearPlaceholder(cm); |
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| 37 | var elt = cm.state.placeholder = document.createElement("pre"); |
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| 38 | elt.style.cssText = "height: 0; overflow: visible"; |
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| 39 | elt.className = "CodeMirror-placeholder"; |
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| 40 | elt.appendChild(document.createTextNode(cm.getOption("placeholder"))); |
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| 41 | cm.display.lineSpace.insertBefore(elt, cm.display.lineSpace.firstChild); |
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| 42 | } |
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| 43 | |
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| 44 | function onBlur(cm) { |
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| 45 | if (isEmpty(cm)) setPlaceholder(cm); |
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| 46 | } |
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| 47 | function onChange(cm) { |
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| 48 | var wrapper = cm.getWrapperElement(), empty = isEmpty(cm); |
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| 49 | wrapper.className = wrapper.className.replace(" CodeMirror-empty", "") + (empty ? " CodeMirror-empty" : ""); |
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| 50 | |
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| 51 | if (empty) setPlaceholder(cm); |
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| 52 | else clearPlaceholder(cm); |
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| 53 | } |
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| 54 | |
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| 55 | function isEmpty(cm) { |
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| 56 | return (cm.lineCount() === 1) && (cm.getLine(0) === ""); |
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| 57 | } |
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| 58 | }); |
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