• React Markdown Html Code
• React Markdown Style
• React Markdown Viewer

In this article I will tell you about how to create Markdown Editor with React.js and Web Storage

Purpose of this article is not to teach you React.js from scratch, I’m only just going to show you how to create a specific project using React.js and explain the code

React-markdowntypically escapes HTML (or ignores it, with skipHtml) because it is dangerous and defeats the purpose of this library. However, if you are in a trusted environment (you trust the markdown), and can spare the bundle size (±60kb minzipped), then you can use rehype-raw. React-markdown typically escapes HTML (or ignores it, with skipHtml), because it is dangerous and defeats the purpose of this library. However, if you are in a trusted environment (you trust the markdown), you can react-markdown/with-html. Markdown-to-HTML converter implemented with React. GitHub Gist: instantly share code, notes, and snippets. React Markdown - GitHub Pages.

If you want to know more about React.js and explore this technology, I recommend that you go through the following courses on Codecademy

In this project, we will use the following libraries and technologies: React.js, Babel, jQuery, Bootstap, Web Storage, Marked.js and Highlight.js

1) React.js — JavaScript Library for Building User Interfaces

2) Babel — Babel is a JavaScript compiler. We will use it for Setting up React for ES6

3) Marked.js — A markdown parser and compiler

4) Highlight.js — Syntax highlighting for the Web

5 Min Quickstart

Get started by creating a new folder for your project, and name it anything you like. Then, inside that folder, create additional folders and files to match the following structure

Start by creating a index.html file with the connected necessary libraries

Open the js/index.babel in your favorite code editor (for example Sublime Text 3 or Atom) and create a new component that simply displays Hello World on page

Now, run your website on a web server. If you see Hello World on page, it means that you have done everything correctly

If you do not have installed MAMP or WAMP server, for this project you can use Node.js local-web-server package

Now we can get started

First we need to create a text box and markdown preview box where you can see the result of the work

To do this, replace the render function in your component with

and add the following styles to your css/style.css file

Now when you run, your page will look like this

The next step we define a initial default value that the user will see in a textarea. To do this, add getInitialState function before render

and replace

with

Now, every time you run the page, you’ll see the following text in a textarea

But you’ve probably noticed that in the preview block nothing. Let’s fix it. Add rawMarkup function immediately after getInitialState that will parse the contents of the text box and output the result in preview box

and replace

with

In this code snippet, I use the standard recommended settings specified in the project repository Marked.js here https://github.com/chjj/marked#usage

and added support syntax highlighting using highlight.js library

and the following code snippet

takes a this.state.content as input, in this case, the contents of the textarea as a result of the output we get the HTML that you will see in preview box

If you try to change the contents of the textarea notice that your changes are not displayed in the preview box. To fix this, add the following handleChange function after getInitialState

and replace

with

Function handleChange is attached to the textarea onChange event. The handleChange function updates the components state with the new value of textarea. This causes the component to re-render with the new value

So when you change the markdown in the textarea field you will see changes in the preview

At this point, your code in index.babel file should look like this

index.babel

Using Web Storage

Suppose a user has written a large amount of text and reload the page by accident, reset computer or even any of the case for which the user did not have time or are not able to save the typed text. The user will probably be upset

What can we do in this case and how to prevent it?

We will keep all written user’s markdown to Local Storage and after each restart page, restarted browser or rebooting the PC, the user will see the text written by him

To do this, add the componentWillMount function immediately after rawMarkup

This code snippet we use to load JavaScript, which is in the file ./js/storage.js on our page within the script tag and execute it every time our component is rendered

Note that the path to storage.js file must be specified relative to the file index.html

Now include the jQuery adding to render

and add the following code in your js/storage.js file

React Markdown Html Code

or without jQuery

In this code snippet, we check the user’s browser supports Local Storage (you can check the browser compatibility using the service Can I Use) and if Local Storage is support we add an event listener to the textarea. Every time the input event is fired on them, it means something has changed and we save textarea contents with all changes to Local Storage with markdownStorage key

Finally, replace the initial default value

with add text from Local Storage

Now, if the user has in Local Storage markdownStorage key, to the textarea will be inserted its contents. If markdownStorage key not found or empty then user will see a default value

Full Code

index.html

css/style.css

js/index.babel

js/storage.js

Overview

Nearly all Markdown applications support the basic syntax outlined in John Gruber’s original design document. There are minor variations and discrepancies between Markdown processors — those are noted inline wherever possible.

Headings

To create a heading, add number signs (#) in front of a word or phrase. The number of number signs you use should correspond to the heading level. For example, to create a heading level three (<h3>), use three number signs (e.g., ### My Header).

Alternate Syntax

Alternatively, on the line below the text, add any number of characters for heading level 1 or -- characters for heading level 2.

Heading Best Practices

Markdown applications don’t agree on how to handle a missing space between the number signs (#) and the heading name. For compatibility, always put a space between the number signs and the heading name.

Paragraphs

To create paragraphs, use a blank line to separate one or more lines of text.

Paragraph Best Practices

Unless the paragraph is in a list, don’t indent paragraphs with spaces or tabs.

Line Breaks

To create a line break (<br>), end a line with two or more spaces, and then type return.

Line Break Best Practices

You can use two or more spaces (commonly referred to as “trailing whitespace”) for line breaks in nearly every Markdown application, but it’s controversial. It’s hard to see trailing whitespace in an editor, and many people accidentally or intentionally put two spaces after every sentence. For this reason, you may want to use something other than trailing whitespace for line breaks. Fortunately, there is another option supported by nearly every Markdown application: the <br> HTML tag.

For compatibility, use trailing white space or the <br> HTML tag at the end of the line.

There are two other options I don’t recommend using. CommonMark and a few other lightweight markup languages let you type a backslash () at the end of the line, but not all Markdown applications support this, so it isn’t a great option from a compatibility perspective. And at least a couple lightweight markup languages don’t require anything at the end of the line — just type return and they’ll create a line break.

Emphasis

You can add emphasis by making text bold or italic.

Bold

To bold text, add two asterisks or underscores before and after a word or phrase. To bold the middle of a word for emphasis, add two asterisks without spaces around the letters.

Bold Best Practices

Markdown applications don’t agree on how to handle underscores in the middle of a word. For compatibility, use asterisks to bold the middle of a word for emphasis.

Italic

To italicize text, add one asterisk or underscore before and after a word or phrase. To italicize the middle of a word for emphasis, add one asterisk without spaces around the letters.

Italic Best Practices

Markdown applications don’t agree on how to handle underscores in the middle of a word. For compatibility, use asterisks to italicize the middle of a word for emphasis.

Bold and Italic

To emphasize text with bold and italics at the same time, add three asterisks or underscores before and after a word or phrase. To bold and italicize the middle of a word for emphasis, add three asterisks without spaces around the letters.

Bold and Italic Best Practices

Markdown applications don’t agree on how to handle underscores in the middle of a word. For compatibility, use asterisks to bold and italicize the middle of a word for emphasis.

Blockquotes

To create a blockquote, add a > in front of a paragraph.

The rendered output looks like this:

Dorothy followed her through many of the beautiful rooms in her castle.

Blockquotes with Multiple Paragraphs

Blockquotes can contain multiple paragraphs. Add a > on the blank lines between the paragraphs.

React Markdown Style

The rendered output looks like this:

Dorothy followed her through many of the beautiful rooms in her castle.

The Witch bade her clean the pots and kettles and sweep the floor and keep the fire fed with wood.

Nested Blockquotes

Blockquotes can be nested. Add a >> in front of the paragraph you want to nest.

The rendered output looks like this:

Dorothy followed her through many of the beautiful rooms in her castle.

The Witch bade her clean the pots and kettles and sweep the floor and keep the fire fed with wood.

Blockquotes with Other Elements

Blockquotes can contain other Markdown formatted elements. Not all elements can be used — you’ll need to experiment to see which ones work.

The rendered output looks like this:

The quarterly results look great!

• Revenue was off the chart.
• Profits were higher than ever.

Everything is going according to plan.

Lists

Silverlight plugin mac amazon. You can organize items into ordered and unordered lists.

Ordered Lists

To create an ordered list, add line items with numbers followed by periods. The numbers don’t have to be in numerical order, but the list should start with the number one.

Ordered List Best Practices

CommonMark and a few other lightweight markup languages let you use a parenthesis ()) as a delimiter (e.g., 1) First item), but not all Markdown applications support this, so it isn’t a great option from a compatibility perspective. For compatibility, use periods only.

Unordered Lists

To create an unordered list, add dashes (-), asterisks (*), or plus signs (+) in front of line items. Indent one or more items to create a nested list.

Starting Unordered List Items With Numbers

If you need to start an unordered list item with a number followed by a period, you can use a backslash () to escape the period.

Unordered List Best Practices

Markdown applications don’t agree on how to handle different delimiters in the same list. For compatibility, don’t mix and match delimiters in the same list — pick one and stick with it.

Adding Elements in Lists

To add another element in a list while preserving the continuity of the list, indent the element four spaces or one tab, as shown in the following examples.

Paragraphs

The rendered output looks like this:

• This is the first list item.

• Here’s the second list item.

  I need to add another paragraph below the second list item.

• And here’s the third list item.

Blockquotes

The rendered output looks like this:

• This is the first list item.

• Here’s the second list item.

  A blockquote would look great below the second list item.

• And here’s the third list item.

Code Blocks

Code blocks are normally indented four spaces or one tab. When they’re in a list, indent them eight spaces or two tabs.

The rendered output looks like this:

1. Open the file.

2. Find the following code block on line 21:

3. Update the title to match the name of your website.

Images

The rendered output looks like this:

1. Open the file containing the Linux mascot.

2. Marvel at its beauty.

3. Close the file.

Lists

You can nest an unordered list in an ordered list, or vice versa.

The rendered output looks like this:

1. First item
2. Second item
3. Third item
   • Indented item
   • Indented item
4. Fourth item

Code

To denote a word or phrase as code, enclose it in backticks (`).

Escaping Backticks

If the word or phrase you want to denote as code includes one or more backticks, you can escape it by enclosing the word or phrase in double backticks (``).

Code Blocks

To create code blocks, indent every line of the block by at least four spaces or one tab.

The rendered output looks like this:

Horizontal Rules

To create a horizontal rule, use three or more asterisks (***), dashes (---), or underscores (___) on a line by themselves.

The rendered output of all three looks identical:

Horizontal Rule Best Practices

For compatibility, put blank lines before and after horizontal rules.

Links

To create a link, enclose the link text in brackets (e.g., [Duck Duck Go]) and then follow it immediately with the URL in parentheses (e.g., (https://duckduckgo.com)).

The rendered output looks like this:

My favorite search engine is Duck Duck Go.

Adding Titles

You can optionally add a title for a link. This will appear as a tooltip when the user hovers over the link. To add a title, enclose it in parentheses after the URL.

The rendered output looks like this:

My favorite search engine is Duck Duck Go.

URLs and Email Addresses

To quickly turn a URL or email address into a link, enclose it in angle brackets.

The rendered output looks like this:

https://www.markdownguide.org
fake@example.com

Formatting Links

To emphasize links, add asterisks before and after the brackets and parentheses. To denote links as code, add backticks in the brackets.

The rendered output looks like this:

I love supporting the EFF.
This is the Markdown Guide.
See the section on code.

Reference-style Links

Reference-style links are a special kind of link that make URLs easier to display and read in Markdown. Reference-style links are constructed in two parts: the part you keep inline with your text and the part you store somewhere else in the file to keep the text easy to read.

Formatting the First Part of the Link

The first part of a reference-style link is formatted with two sets of brackets. The first set of brackets surrounds the text that should appear linked. The second set of brackets displays a label used to point to the link you’re storing elsewhere in your document.

Although not required, you can include a space between the first and second set of brackets. The label in the second set of brackets is not case sensitive and can include letters, numbers, spaces, or punctuation.

This means the following example formats are roughly equivalent for the first part of the link:

• [hobbit-hole][1]
• [hobbit-hole] [1]

Formatting the Second Part of the Link

The second part of a reference-style link is formatted with the following attributes:

1. The label, in brackets, followed immediately by a colon and at least one space (e.g., [label]: ).
2. The URL for the link, which you can optionally enclose in angle brackets.
3. The optional title for the link, which you can enclose in double quotes, single quotes, or parentheses.

This means the following example formats are all roughly equivalent for the second part of the link:

• [1]: https://en.wikipedia.org/wiki/Hobbit#Lifestyle
• [1]: https://en.wikipedia.org/wiki/Hobbit#Lifestyle 'Hobbit lifestyles'
• [1]: https://en.wikipedia.org/wiki/Hobbit#Lifestyle 'Hobbit lifestyles'
• [1]: https://en.wikipedia.org/wiki/Hobbit#Lifestyle (Hobbit lifestyles)
• [1]: <https://en.wikipedia.org/wiki/Hobbit#Lifestyle> 'Hobbit lifestyles'
• [1]: <https://en.wikipedia.org/wiki/Hobbit#Lifestyle> 'Hobbit lifestyles'
• [1]: <https://en.wikipedia.org/wiki/Hobbit#Lifestyle> (Hobbit lifestyles)

You can place this second part of the link anywhere in your Markdown document. Some people place them immediately after the paragraph in which they appear while other people place them at the end of the document (like endnotes or footnotes).

An Example Putting the Parts Together

Say you add a URL as a standard URL link to a paragraph and it looks like this in Markdown:

Though it may point to interesting additional information, the URL as displayed really doesn’t add much to the existing raw text other than making it harder to read. To fix that, you could format the URL like this instead:

In both instances above, the rendered output would be identical:

In a hole in the ground there lived a hobbit. Not a nasty, dirty, wet hole, filled with the ends of worms and an oozy smell, nor yet a dry, bare, sandy hole with nothing in it to sit down on or to eat: it was a hobbit-hole, and that means comfort.

and the HTML for the link would be:

Link Best Practices

Markdown applications don’t agree on how to handle spaces in the middle of a URL. For compatibility, try to URL encode any spaces with %20.

Images

To add an image, add an exclamation mark (!), followed by alt text in brackets, and the path or URL to the image asset in parentheses. You can optionally add a title after the URL in the parentheses.

The rendered output looks like this:

Linking Images

To add a link to an image, enclose the Markdown for the image in brackets, and then add the link in parentheses.

The rendered output looks like this:

Escaping Characters

To display a literal character that would otherwise be used to format text in a Markdown document, add a backslash () in front of the character.

The rendered output looks like this:

React Markdown Viewer

* Without the backslash, this would be a bullet in an unordered list.

Characters You Can Escape

You can use a backslash to escape the following characters.

HTML

Many Markdown applications allow you to use HTML tags in Markdown-formatted text. This is helpful if you prefer certain HTML tags to Markdown syntax. For example, some people find it easier to use HTML tags for images. Using HTML is also helpful when you need to change the attributes of an element, like specifying the color of text or changing the width of an image.

To use HTML, place the tags in the text of your Markdown-formatted file.

The rendered output looks like this:

This word is bold. This word is italic.

HTML Best Practices

For security reasons, not all Markdown applications support HTML in Markdown documents. When in doubt, check your Markdown application’s documentation. Some applications support only a subset of HTML tags.

Use blank lines to separate block-level HTML elements like <div>, <table>, <pre>, and <p> from the surrounding content. Try not to indent the tags with tabs or spaces — that can interfere with the formatting.

You can’t use Markdown syntax inside block-level HTML tags. For example, <p>italic and **bold**</p> won’t work.

Take your Markdown skills to the next level.

Learn Markdown in 60 pages. Designed for both novices and experts, The Markdown Guide book is a comprehensive reference that has everything you need to get started and master Markdown syntax.

Want to learn more Markdown?

Don't stop now! 😎 Star the GitHub repository and then enter your email address below to receive new Markdown tutorials via email. No spam!