55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
(function() {
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CodeMirror.defineOption("placeholder", "", function(cm, val, old) {
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var prev = old && old != CodeMirror.Init;
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if (val && !prev) {
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cm.on("focus", onFocus);
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cm.on("blur", onBlur);
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cm.on("change", onChange);
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onChange(cm);
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} else if (!val && prev) {
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cm.off("focus", onFocus);
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cm.off("blur", onBlur);
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cm.off("change", onChange);
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clearPlaceholder(cm);
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var wrapper = cm.getWrapperElement();
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wrapper.className = wrapper.className.replace(" CodeMirror-empty", "");
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}
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if (val && !cm.hasFocus()) onBlur(cm);
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});
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function clearPlaceholder(cm) {
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if (cm.state.placeholder) {
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cm.state.placeholder.parentNode.removeChild(cm.state.placeholder);
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cm.state.placeholder = null;
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}
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}
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function setPlaceholder(cm) {
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clearPlaceholder(cm);
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var elt = cm.state.placeholder = document.createElement("pre");
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elt.style.cssText = "height: 0; overflow: visible";
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elt.className = "CodeMirror-placeholder";
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elt.appendChild(document.createTextNode(cm.getOption("placeholder")));
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cm.display.lineSpace.insertBefore(elt, cm.display.lineSpace.firstChild);
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}
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function onFocus(cm) {
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clearPlaceholder(cm);
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}
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function onBlur(cm) {
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if (isEmpty(cm)) setPlaceholder(cm);
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}
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function onChange(cm) {
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var wrapper = cm.getWrapperElement(), empty = isEmpty(cm);
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wrapper.className = wrapper.className.replace(" CodeMirror-empty", "") + (empty ? " CodeMirror-empty" : "");
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if (cm.hasFocus()) return;
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if (empty) setPlaceholder(cm);
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else clearPlaceholder(cm);
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}
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function isEmpty(cm) {
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return (cm.lineCount() === 1) && (cm.getLine(0) === "");
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}
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})();
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