add placeholder option

README.md

@@ -90,6 +90,7 @@ simplemde.value("This text will appear in the editor");
   - **allowAtxHeaderWithoutSpace**: If set to `true`, will render headers without a space after the `#`. Defaults to `false`.
   - **strikethrough**: If set to `false`, will not process GFM strikethrough syntax. Defaults to `true`.
   - **underscoresBreakWords**: If set to `true`, let underscores be a delimiter for separating words. Defaults to `false`.
+- **placeholder**: Custom placeholder that should be displayed
 - **previewRender**: Custom function for parsing the plaintext Markdown and returning HTML. Used when user previews.
 - **renderingConfig**: Adjust settings for parsing the Markdown during previewing (not editing).
   - **singleLineBreaks**: If set to `false`, disable parsing GFM single line breaks. Defaults to `true`.
@@ -131,6 +132,7 @@ var simplemde = new SimpleMDE({
 		strikethrough: false,
 		underscoresBreakWords: true,
 	},
+    placeholder: 'Type here...',
 	previewRender: function(plainText) {
 		return customMarkdownParser(plainText); // Returns HTML from a custom parser
 	},

src/js/simplemde.js

@@ -6,6 +6,7 @@ require("./codemirror/tablist");
 require("codemirror/addon/display/fullscreen.js");
 require("codemirror/mode/markdown/markdown.js");
 require("codemirror/addon/mode/overlay.js");
+require("codemirror/addon/display/placeholder.js");
 require("codemirror/mode/gfm/gfm.js");
 require("codemirror/mode/xml/xml.js");
 require("spell-checker");
@@ -1047,7 +1048,8 @@ SimpleMDE.prototype.render = function(el) {
 		autofocus: (options.autofocus === true) ? true : false,
 		extraKeys: keyMaps,
 		lineWrapping: (options.lineWrapping === false) ? false : true,
-		allowDropFileTypes: ["text/plain"]
+		allowDropFileTypes: ["text/plain"],
+		placeholder: options.placeholder || el.getAttribute('placeholder') || ''
 	});
 
 	if(options.toolbar !== false) {