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1 // CodeMirror, copyright (c) by Marijn Haverbeke and others
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2 // Distributed under an MIT license: https://codemirror.net/5/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 cm.on("swapDoc", onChange);
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18 CodeMirror.on(cm.getInputField(), "compositionupdate", cm.state.placeholderCompose = function() { onComposition(cm) })
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19 onChange(cm);
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20 } else if (!val && prev) {
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21 cm.off("blur", onBlur);
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22 cm.off("change", onChange);
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23 cm.off("swapDoc", onChange);
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24 CodeMirror.off(cm.getInputField(), "compositionupdate", cm.state.placeholderCompose)
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25 clearPlaceholder(cm);
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26 var wrapper = cm.getWrapperElement();
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27 wrapper.className = wrapper.className.replace(" CodeMirror-empty", "");
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28 }
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29
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30 if (val && !cm.hasFocus()) onBlur(cm);
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31 });
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32
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33 function clearPlaceholder(cm) {
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34 if (cm.state.placeholder) {
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35 cm.state.placeholder.parentNode.removeChild(cm.state.placeholder);
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36 cm.state.placeholder = null;
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37 }
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38 }
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39 function setPlaceholder(cm) {
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40 clearPlaceholder(cm);
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41 var elt = cm.state.placeholder = document.createElement("pre");
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42 elt.style.cssText = "height: 0; overflow: visible";
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43 elt.style.direction = cm.getOption("direction");
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44 elt.className = "CodeMirror-placeholder CodeMirror-line-like";
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45 var placeHolder = cm.getOption("placeholder")
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46 if (typeof placeHolder == "string") placeHolder = document.createTextNode(placeHolder)
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47 elt.appendChild(placeHolder)
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48 cm.display.lineSpace.insertBefore(elt, cm.display.lineSpace.firstChild);
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49 }
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50
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51 function onComposition(cm) {
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52 setTimeout(function() {
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53 var empty = false
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54 if (cm.lineCount() == 1) {
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55 var input = cm.getInputField()
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56 empty = input.nodeName == "TEXTAREA" ? !cm.getLine(0).length
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57 : !/[^\u200b]/.test(input.querySelector(".CodeMirror-line").textContent)
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58 }
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59 if (empty) setPlaceholder(cm)
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60 else clearPlaceholder(cm)
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61 }, 20)
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62 }
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63
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64 function onBlur(cm) {
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65 if (isEmpty(cm)) setPlaceholder(cm);
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66 }
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67 function onChange(cm) {
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68 var wrapper = cm.getWrapperElement(), empty = isEmpty(cm);
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69 wrapper.className = wrapper.className.replace(" CodeMirror-empty", "") + (empty ? " CodeMirror-empty" : "");
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70
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71 if (empty) setPlaceholder(cm);
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72 else clearPlaceholder(cm);
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73 }
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74
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75 function isEmpty(cm) {
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76 return (cm.lineCount() === 1) && (cm.getLine(0) === "");
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77 }
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78 });
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