@colinarms/easymde

v2.8.0

Published

3 years ago

A simple, beautiful, and embeddable JavaScript Markdown editor that easy to use. Features include autosaving and spell checking.

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colinarms

embeddable markdown editor javascript fontawesome

EasyMDE - Markdown Editor

This repository is a fork of SimpleMDE, made by Sparksuite. Go to the dedicated section for more information.

A drop-in JavaScript text area replacement for writing beautiful and understandable Markdown. EasyMDE allows users who may be less experienced with Markdown to use familiar toolbar buttons and shortcuts.

In addition, the syntax is rendered while editing to clearly show the expected result. Headings are larger, emphasized words are italicized, links are underlined, etc.

EasyMDE also features both built-in auto saving and spell checking. The editor is entirely customizable, from theming to toolbar buttons and javascript hooks.

Try the demo

Quick access

Install EasyMDE

Via npm:

npm install easymde --save

Via the UNPKG CDN:

<link rel="stylesheet" href="https://unpkg.com/easymde/dist/easymde.min.css">
<script src="https://unpkg.com/easymde/dist/easymde.min.js"></script>

How to use

Loading the editor

After installing and/or importing the module, you can load EasyMDE onto the first TextArea on the web page:

<textarea></textarea>
<script>
var easyMDE = new EasyMDE();
</script>

Alternatively you can select a specific TextArea, via Javascript:

<textarea id="my-text-area"></textarea>
<script>
var easyMDE = new EasyMDE({element: document.getElementById('my-text-area')});
</script>

Or via jQuery:

<textarea id="my-text-area"></textarea>
<script>
var easyMDE = new EasyMDE({element: $('#my-text-area')[0]});
</script>

Editor functions

Use EasyMDE.value() to get the content of the editor:

<script>
easyMDE.value();
</script>

Use EasyMDE.value(val) to set the content of the editor:

<script>
easyMDE.value('New input for **EasyMDE**');
</script>

Configuration

Options list

autoDownloadFontAwesome: If set to true, force downloads Font Awesome (used for icons). If set to false, prevents downloading. Defaults to undefined, which will intelligently check whether Font Awesome has already been included, then download accordingly.
autofocus: If set to true, focuses the editor automatically. Defaults to false.
autosave: Saves the text that's being written and will load it back in the future. It will forget the text when the form it's contained in is submitted.
- enabled: If set to true, saves the text automatically. Defaults to false.
- delay: Delay between saves, in milliseconds. Defaults to 10000 (10s).
- uniqueId: You must set a unique string identifier so that EasyMDE can autosave. Something that separates this from other instances of EasyMDE elsewhere on your website.
blockStyles: Customize how certain buttons that style blocks of text behave.
- bold: Can be set to ** or __. Defaults to **.
- code: Can be set to ``` or ~~~. Defaults to ```.
- italic: Can be set to * or _. Defaults to *.
element: The DOM element for the TextArea to use. Defaults to the first TextArea on the page.
forceSync: If set to true, force text changes made in EasyMDE to be immediately stored in original text area. Defaults to false.
hideIcons: An array of icon names to hide. Can be used to hide specific icons shown by default without completely customizing the toolbar.
indentWithTabs: If set to false, indent using spaces instead of tabs. Defaults to true.
initialValue: If set, will customize the initial value of the editor.
insertTexts: Customize how certain buttons that insert text behave. Takes an array with two elements. The first element will be the text inserted before the cursor or highlight, and the second element will be inserted after. For example, this is the default link value: ["[", "](http://)"].
- horizontalRule
- image
- link
- table
lineWrapping: If set to false, disable line wrapping. Defaults to true.
minHeight: Sets the minimum height for the composition area, before it starts auto-growing. Should be a string containing a valid CSS value like "500px". Defaults to "300px".
onToggleFullScreen: A function that gets called when the editor's full screen mode is toggled. The function will be passed a boolean as parameter, true when the editor is currently going into full screen mode, or false.
parsingConfig: Adjust settings for parsing the Markdown during editing (not previewing).
- 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: If set, displays a custom placeholder message.
previewClass: A string or array of strings that will be applied to the preview screen when activated. Defaults to "editor-preview".
previewRender: Custom function for parsing the plaintext Markdown and returning HTML. Used when user previews.
promptURLs: If set to true, a JS alert window appears asking for the link or image URL. Defaults to false.
promptTexts: Customize the text used to prompt for URLs.
- image: The text to use when prompting for an image's URL. Defaults to URL of the image:.
- link: The text to use when prompting for a link's URL. Defaults to URL for the link:.
uploadImage: If set to true, enables the image upload functionality, which can be triggered by drag&drop, copy-paste and through the browse-file window (opened when the user click on the upload-image icon). Defaults to false.
imageMaxSize: Maximum image size in bytes, checked before upload (note: never trust client, always check image size at server-side). Defaults to 1024*1024*2 (2Mb).
imageAccept: A comma-separated list of mime-types used to check image type before upload (note: never trust client, always check file types at server-side). Defaults to image/png, image/jpeg.
imageUploadFunction: A custom function for handling the image upload. Using this function will render the options imageMaxSize, imageAccept, imageUploadEndpoint and imageCSRFToken ineffective.
- The function gets a file and onSuccess and onError callback functions as parameters. onSuccess(imageUrl: string) and onError(errorMessage: string)
imageUploadEndpoint: The endpoint where the images data will be sent, via an asynchronous POST request. The server is supposed to save this image, and return a json response.
- if the request was successfully processed (HTTP 200-OK): {"data": {"filePath": "<filePath>"}} where filePath is the relative path of the image;
- otherwise: {"error": "<errorCode>"}, where errorCode can be noFileGiven (HTTP 400), typeNotAllowed (HTTP 415), fileTooLarge (HTTP 413) or importError (see errorMessages below). If errorCode is not one of the errorMessages, it is alerted unchanged to the user. This allows for server side error messages. No default value.
imageCSRFToken: CSRF token to include with AJAX call to upload image. For instance used with Django backend.
imageTexts: Texts displayed to the user (mainly on the status bar) for the import image feature, where #image_name#, #image_size# and #image_max_size# will replaced by their respective values, that can be used for customization or internationalization:
- sbInit: Status message displayed initially if uploadImage is set to true. Defaults to Attach files by drag and dropping or pasting from clipboard..
- sbOnDragEnter: Status message displayed when the user drags a file to the text area. Defaults to Drop image to upload it..
- sbOnDrop: Status message displayed when the user drops a file in the text area. Defaults to Uploading images #images_names#.
- sbProgress: Status message displayed to show uploading progress. Defaults to Uploading #file_name#: #progress#%.
- sbOnUploaded: Status message displayed when the image has been uploaded. Defaults to Uploaded #image_name#.
- sizeUnits: A comma-separated list of units used to display messages with human-readable file sizes. Defaults to b,Kb,Mb.
errorMessages: Errors displayed to the user, using the errorCallback option, where #image_name#, #image_size# and #image_max_size# will replaced by their respective values, that can be used for customization or internationalization:
- noFileGiven: The server did not receive any file from the user. Defaults to You must select a file..
- typeNotAllowed: The user send a file type which doesn't match the imageAccept list, or the server returned this error code. Defaults to This image type is not allowed..
- fileTooLarge: The size of the image being imported is bigger than the imageMaxSize, or if the server returned this error code. Defaults to Image #image_name# is too big (#image_size#).\nMaximum file size is #image_max_size#..
- importError: An unexpected error occurred when uploading the image. Defaults to Something went wrong when uploading the image #image_name#..
errorCallback: A callback function used to define how to display an error message. Defaults to function(errorMessage) {alert(errorMessage);};.
renderingConfig: Adjust settings for parsing the Markdown during previewing (not editing).
- codeSyntaxHighlighting: If set to true, will highlight using highlight.js. Defaults to false. To use this feature you must include highlight.js on your page or pass in using the hljs option. For example, include the script and the CSS files like:<script src="https://cdn.jsdelivr.net/highlight.js/latest/highlight.min.js"></script><link rel="stylesheet" href="https://cdn.jsdelivr.net/highlight.js/latest/styles/github.min.css">
- hljs: An injectible instance of highlight.js. If you don't want to rely on the global namespace (window.hljs), you can provide an instance here. Defaults to undefined.
- markedOptions: Set the internal Markdown renderer's options. Other renderingConfig options will take precedence.
- singleLineBreaks: If set to false, disable parsing GFM single line breaks. Defaults to true.
shortcuts: Keyboard shortcuts associated with this instance. Defaults to the array of shortcuts.
showIcons: An array of icon names to show. Can be used to show specific icons hidden by default without completely customizing the toolbar.
spellChecker: If set to false, disable the spell checker. Defaults to true.
status: If set to false, hide the status bar. Defaults to the array of built-in status bar items.
- Optionally, you can set an array of status bar items to include, and in what order. You can even define your own custom status bar items.
styleSelectedText: If set to false, remove the CodeMirror-selectedtext class from selected lines. Defaults to true.
syncSideBySidePreviewScroll: If set to false, disable syncing scroll in side by side mode. Defaults to true.
tabSize: If set, customize the tab size. Defaults to 2.
theme: Override the theme. Defaults to easymde.
toolbar: If set to false, hide the toolbar. Defaults to the array of icons.
toolbarTips: If set to false, disable toolbar button tips. Defaults to true.

Options example

Most options demonstrate the non-default behavior:

var editor = new EasyMDE({
	autofocus: true,
	autosave: {
		enabled: true,
		uniqueId: "MyUniqueID",
		delay: 1000,
	},
	blockStyles: {
		bold: "__",
		italic: "_",
	},
	element: document.getElementById("MyID"),
	forceSync: true,
	hideIcons: ["guide", "heading"],
	indentWithTabs: false,
	initialValue: "Hello world!",
	insertTexts: {
		horizontalRule: ["", "\n\n-----\n\n"],
		image: ["![](http://", ")"],
		link: ["[", "](http://)"],
		table: ["", "\n\n| Column 1 | Column 2 | Column 3 |\n| -------- | -------- | -------- |\n| Text     | Text      | Text     |\n\n"],
	},
	lineWrapping: false,
	minHeight: "500px",
	parsingConfig: {
		allowAtxHeaderWithoutSpace: true,
		strikethrough: false,
		underscoresBreakWords: true,
	},
	placeholder: "Type here...",
	
	previewClass: "my-custom-styling",
	previewClass: ["my-custom-styling", "more-custom-styling"],
	
	previewRender: function(plainText) {
		return customMarkdownParser(plainText); // Returns HTML from a custom parser
	},
	previewRender: function(plainText, preview) { // Async method
		setTimeout(function(){
			preview.innerHTML = customMarkdownParser(plainText);
		}, 250);

		return "Loading...";
	},
	promptURLs: true,
	promptTexts: {
		image: "Custom prompt for URL:",
		link: "Custom prompt for URL:",
	},
	renderingConfig: {
		singleLineBreaks: false,
		codeSyntaxHighlighting: true,
	},
	shortcuts: {
		drawTable: "Cmd-Alt-T"
	},
	showIcons: ["code", "table"],
	spellChecker: false,
	status: false,
	status: ["autosave", "lines", "words", "cursor"], // Optional usage
	status: ["autosave", "lines", "words", "cursor", {
		className: "keystrokes",
		defaultValue: function(el) {
			this.keystrokes = 0;
			el.innerHTML = "0 Keystrokes";
		},
		onUpdate: function(el) {
			el.innerHTML = ++this.keystrokes + " Keystrokes";
		},
	}], // Another optional usage, with a custom status bar item that counts keystrokes
	styleSelectedText: false,
	syncSideBySidePreviewScroll: false,
	tabSize: 4,
	toolbar: false,
	toolbarTips: false,
});

Toolbar icons

Below are the built-in toolbar icons (only some of which are enabled by default), which can be reorganized however you like. "Name" is the name of the icon, referenced in the JS. "Action" is either a function or a URL to open. "Class" is the class given to the icon. "Tooltip" is the small tooltip that appears via the title="" attribute. Note that shortcut hints are added automatically and reflect the specified action if it has a key bind assigned to it (i.e. with the value of action set to bold and that of tooltip set to Bold, the final text the user will see would be "Bold (Ctrl-B)").

Additionally, you can add a separator between any icons by adding "|" to the toolbar array.

Toolbar customization

Customize the toolbar using the toolbar option.

Only the order of existing buttons:

var easyMDE = new EasyMDE({
	toolbar: ["bold", "italic", "heading", "|", "quote"]
});

All information and/or add your own icons

var easyMDE = new EasyMDE({
	toolbar: [{
			name: "bold",
			action: EasyMDE.toggleBold,
			className: "fa fa-bold",
			title: "Bold",
		},
		{
			name: "custom",
			action: function customFunction(editor){
				// Add your own code
			},
			className: "fa fa-star",
			title: "Custom Button",
		},
		"|" // Separator
		// [, ...]
	]
});

Keyboard shortcuts

EasyMDE comes with an array of predefined keyboard shortcuts, but they can be altered with a configuration option. The list of default ones is as follows:

Here is how you can change a few, while leaving others untouched:

var editor = new EasyMDE({
	shortcuts: {
		"toggleOrderedList": "Ctrl-Alt-K", // alter the shortcut for toggleOrderedList
		"toggleCodeBlock": null, // unbind Ctrl-Alt-C
		"drawTable": "Cmd-Alt-T", // bind Cmd-Alt-T to drawTable action, which doesn't come with a default shortcut
	}
});

Shortcuts are automatically converted between platforms. If you define a shortcut as "Cmd-B", on PC that shortcut will be changed to "Ctrl-B". Conversely, a shortcut defined as "Ctrl-B" will become "Cmd-B" for Mac users.

The list of actions that can be bound is the same as the list of built-in actions available for toolbar buttons.

Advanced use

Event handling

You can catch the following list of events: https://codemirror.net/doc/manual.html#events

var easyMDE = new EasyMDE();
easyMDE.codemirror.on("change", function(){
	console.log(easyMDE.value());
});

Removing EasyMDE from text area

You can revert to the initial text area by calling the toTextArea method. Note that this clears up the autosave (if enabled) associated with it. The text area will retain any text from the destroyed EasyMDE instance.

var easyMDE = new EasyMDE();
// ...
easyMDE.toTextArea();
easyMDE = null;

Useful methods

The following self-explanatory methods may be of use while developing with EasyMDE.

var easyMDE = new EasyMDE();
easyMDE.isPreviewActive(); // returns boolean
easyMDE.isSideBySideActive(); // returns boolean
easyMDE.isFullscreenActive(); // returns boolean
easyMDE.clearAutosavedValue(); // no returned value

How it works

EasyMDE is a continuation of SimpleMDE.

SimpleMDE began as an improvement of lepture's Editor project, but has now taken on an identity of its own. It is bundled with CodeMirror and depends on Font Awesome.

CodeMirror is the backbone of the project and parses much of the Markdown syntax as it's being written. This allows us to add styles to the Markdown that's being written. Additionally, a toolbar and status bar have been added to the top and bottom, respectively. Previews are rendered by Marked using GFM.

SimpleMDE fork

I originally made this fork to implement FontAwesome 5 compatibility into SimpleMDE. When that was done I submitted a pull request, which has not been accepted yet. This, and the project being inactive since May 2017, triggered me to make more changes and try to put new life into the project.

Changes include:

FontAwesome 5 compatibility
Guide button works when editor is in preview mode
Links are now https:// by default
Small styling changes
Support for Node 8 and beyond
Lots of refactored code
Links in preview will open in a new tab by default
Typescript support

My intention is to continue development on this project, improving it and keeping it alive.

Hacking EasyMDE

You may want to edit this library to adapt its behavior to your needs. This can be done in some quick steps:

Follow the prerequisites and installation instructions in the contribution guide;
Do your changes;
Run gulp command, which will generate files: dist/easymde.min.css and dist/easymde.min.js;
Copy-paste those files to your code base, and you are done.

Contributing

Want to contribute to EasyMDE? Thank you! We have a contribution guide just for you!

License

This project is released under the MIT License.