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.
- **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.
- **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.*
- **delay**: Delay between saves, in milliseconds. Defaults to `10000` (10 seconds).
- **submit_delay**: Delay before assuming that submit of the form failed and saving the text, in milliseconds. Defaults to `autosave.delay` or `10000` (10 seconds).
- **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.
- **timeFormat**: Set DateTimeFormat. More information see [DateTimeFormat instances](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/DateTimeFormat). Default `locale: en-US, format: hour:minute`.
- **autoRefresh**: Useful, when initializing the editor in a hidden DOM node. If set to `{ delay: 300 }`, it will check every 300 ms if the editor is visible and if positive, call CodeMirror's [`refresh()`](https://codemirror.net/doc/manual.html#refresh).
- **scrollbarStyle**: Chooses a scrollbar implementation. The default is "native", showing native scrollbars. The core library also provides the "null" style, which completely hides the scrollbars. Addons can implement additional scrollbar models.
- **previewImagesInEditor**: - EasyMDE will show preview of images, `false` by default, preview for images will appear only for images on separate lines.
- **imagesPreviewHandler**: - A custom function for handling the preview of images. Takes the parsed string between the parantheses of the image markdown `` as argument and returns a string that serves as the `src` attribute of the `<img>` tag in the preview. Enables dynamic previewing of images in the frontend without having to upload them to a server, allows copy-pasting of images to the editor with preview.
- **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://)"]`.
- **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"`.
- **maxHeight**: Sets fixed height for the composition area. `minHeight` option will be ignored. Should be a string containing a valid CSS value like `"500px"`. Defaults to `undefined`.
- **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`.
- **overlayMode**: Pass a custom codemirror [overlay mode](https://codemirror.net/doc/manual.html#modeapi) to parse and style the Markdown during editing.
- **combine**: If set to `false`, will *replace* CSS classes returned by the default Markdown mode. Otherwise the classes returned by the custom mode will be combined with the classes returned by the default mode. Defaults to `true`.
- **uploadImage**: If set to `true`, enables the image upload functionality, which can be triggered by drag and 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 the image size at server-side). Defaults to `1024 * 1024 * 2` (2 MB).
- **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 path of the image (absolute if `imagePathAbsolute` is set to true, relative if otherwise);
- otherwise: `{"error": "<errorCode>"}`, where *errorCode* can be `noFileGiven` (HTTP 400 Bad Request), `typeNotAllowed` (HTTP 415 Unsupported Media Type), `fileTooLarge` (HTTP 413 Payload Too Large) 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.
- **imagePathAbsolute**: If set to `true`, will treat `imageUrl` from `imageUploadFunction` and *filePath* returned from `imageUploadEndpoint` as an absolute rather than relative path, i.e. not prepend `window.location.origin` to it.
- **imageCSRFName**: CSRF token filed name to include with AJAX call to upload image, applied when `imageCSRFToken` has value, defaults to `csrfmiddlewaretoken`.
- **imageCSRFHeader**: If set to `true`, passing CSRF token via header. Defaults to `false`, which pass CSRF through request body.
- **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.`.
- **sizeUnits**: A comma-separated list of units used to display messages with human-readable file sizes. Defaults to ` B, KB, MB` (example: `218 KB`). You can use `B,KB,MB` instead if you prefer without whitespaces (`218KB`).
- **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:
- **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#.`.
- **codeSyntaxHighlighting**: If set to `true`, will highlight using [highlight.js](https://github.com/isagalaev/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:<br>`<scriptsrc="https://cdn.jsdelivr.net/highlight.js/latest/highlight.min.js"></script>`<br>`<linkrel="stylesheet"href="https://cdn.jsdelivr.net/highlight.js/latest/styles/github.min.css">`
- **hljs**: An injectible instance of [highlight.js](https://github.com/isagalaev/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](https://marked.js.org/#/USING_ADVANCED.md#options). Other `renderingConfig` options will take precedence.
- **singleLineBreaks**: If set to `false`, disable parsing [GitHub Flavored Markdown](https://github.github.com/gfm/) (GFM) single line breaks. Defaults to `true`.
- **sanitizerFunction**: Custom function for sanitizing the HTML output of Markdown renderer.
- **inputStyle**: `textarea` or `contenteditable`. Defaults to `textarea` for desktop and `contenteditable` for mobile. `contenteditable` option is necessary to enable nativeSpellcheck.
- **toolbarButtonClassPrefix**: Adds a prefix to the toolbar button classes when set. For example, a value of `"mde"` results in `"mde-bold"` for the Bold button.
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 JavaScript. "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)").
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:
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.
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.
SimpleMDE began as an improvement of [lepture's Editor project](https://github.com/lepture/editor), but has now taken on an identity of its own. It is bundled with [CodeMirror](https://github.com/codemirror/codemirror) and depends on [Font Awesome](http://fontawesome.io).
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](https://github.com/chjj/marked) using GitHub Flavored Markdown (GFM).
I originally made this fork to implement FontAwesome 5 compatibility into SimpleMDE. When that was done I submitted a [pull request](https://github.com/sparksuite/simplemde-markdown-editor/pull/666), 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
You may want to edit this library to adapt its behavior to your needs. This can be done in some quick steps:
1. Follow the [prerequisites](./CONTRIBUTING.md#prerequisites) and [installation](./CONTRIBUTING.md#installation) instructions in the contribution guide;
2. Do your changes;
3. Run `gulp` command, which will generate files: `dist/easymde.min.css` and `dist/easymde.min.js`;
4. Copy-paste those files to your code base, and you are done.
