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Introduction to React.js Radoslav Stankov 22/09/2015

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Radoslav Stankov @rstankov http://rstankov.com http://blog.rstankov.com http://github.com/rstankov

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{post.votesCount}

{post.name}

{post.headline}

{post.commentsCount} {post.votesCount}

{post.name}

{post.headline}

{post.commentsCount}

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var PostList = React.createClass({ render: function() { } });

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var PostList = React.createClass({ render: function() { } }); ?

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Render

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component.render() props, state

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Virtual DOM

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Virtual Dom React Element React Element React Element React Element React Element

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Virtual Dom DOM Element DOM Element DOM Element DOM Element DOM Element

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Virtual Dom React Element React Element React Element React Element React Element

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Virtual Dom React Element React Element React Element React Element React Element

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Virtual Dom React Element React Element React Element React Element React Element

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Virtual Dom React Element React Element React Element React Element React Element React Element React Element React Element React Element React Element

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Virtual Dom React Element React Element React Element React Element React Element React Element React Element React Element React Element React Element DOM Element DOM Element DOM Element DOM Element DOM Element

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Virtual Dom React Element React Element React Element React Element React Element React Element React Element React Element React Element React Element DOM Element DOM Element DOM Element DOM Element DOM Element DOM Element DOM Element DOM Element DOM Element DOM Element

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var PostList = React.createClass({ render: function() { } });

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var PostList = React.createClass({ render: function() { var posts = this.props.posts.map(function(post) { return ( React.createElement("article", {className: "post-item"}, React.createElement("button", {className: "vote-button"}, post.vo React.createElement("div", null, React.createElement("h1", null, post.name), React.createElement("p", null, post.headline) ), React.createElement("button", {className: "comment-button"}, post ) ); }); return ( React.createElement("div", {className: "post-list"}, posts) ) } });

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Can’t tell if it is true or just trolling

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var PostList = React.createClass({ render: function() { var posts = this.props.posts.map(function(post) { return ( {post.votesCount}

{post.name}

{post.headline}

{post.commentsCount} ); }); return (
{posts}
) } });

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STILL can’t tell if it is true or just trolling

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JSX

{post.name}

{post.headline}

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React.createElement("button", {className: "vote-button"}, post.votesCount)) {post.votesCount}

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React.createElement("div", null, React.createElement("h1", null, post.name), React.createElement("p", null, post.headline) )

{post.name}

{post.headline}

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Code vs Template

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render() { return this.props.results.map(function(result) { return (

{result.name}

{result.headline}

visit ); }); } Looping

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{{result.name}}

{{result.headline}}

visit
Looping

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{{#each result in results}}

{{result.name}}

{{result.headline}}

{{#link-to result.link}}visit{{/link-to}} {{/each}} Looping

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render() { if (this.props.results.length === 0) { return ( No results found ); } return this.props.results.map(function(result) { return (

{result.name}

{result.headline}

visit ); }); } Conditions

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No results found

{{result.name}}

{{result.headline}}

visit
Conditions

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{{#if results}} {{#each result in results}}

{{result.name}}

{{result.headline}}

{{#link-to result.link}}visit{{/link-to}} {{/each}} {{else}} No results found {{/if}} Conditions

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render() { if (this.props.results.length === 0) { return this.renderEmptyMessage(); } return this.renderResultsList(); } Components

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render() { if (this.props.results.length === 0) { return } return } Components

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Components

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Components

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{{#if results}} {{my-app-no-results}} {{else}} {{my-app-no-results-list}} {{/if}} Components

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{{#if results}} {{partial "no-results"}} {{else}} {{partial "results-list"}} {{/if}} Components

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{{#if results}} {{view "no-results"}} {{else}} {{view "results-list"}} {{/if}} Components

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var PostList = React.createClass({ render: function() { var posts = this.props.posts.map(function(post) { return ( {post.votesCount}

{post.name}

{post.headline}

{post.commentsCount} ); }); return (
{posts}
) } });

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No content

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No content

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var PostList = React.createClass({ render: function() { var posts = this.props.posts.map(function(post) { return ; }); return (
{posts}
) } });

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var PostItem = React.createClass({ render: function() { return ( {this.props.post.votesCount}

{this.props.post.name}

{this.props.post.headline}

{this.props.post.commentsCount} ); } });

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var PostItem = React.createClass({ render: function() { var className = classNames('vote-button', {active: this.props.post.hasVoted}); return ( {this.props.post.votesCount}

{this.props.post.name}

{this.props.post.headline}

{this.props.post.commentsCount} ); } });

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var PostItem = React.createClass({ getInitialState: function() { return { hasVoted: this.props.post.hasVoted, votesCount: this.props.post.votesCount, }; }, render: function() { var className = classNames('vote-button', {active: this.state.hasVoted}); return ( {this.state.votesCount}

{this.props.post.name}

{this.props.post.headline}

{this.props.post.commentsCount} ); }, handleVoteClick: function () { var updatedPost = toggleVote(this.props.post); this.setState({ hasVoted: updatedPost.hasVoted, votesCount: updatedPost.votesCount, }); } });

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Virtual Dom div article article button div button h1 p

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Virtual Dom PostList PostItem PostItem button div button h1 p

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Virtual Dom PostList PostItem PostItem button div button h1 p

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Virtual Dom PostList PostItem PostItem button div button h1 p

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Virtual Dom PostList PostItem PostItem Vote Button div h1 p button

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Virtual Dom PostList PostItem PostItem Vote Button div h1 p button

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var PostItem = React.createClass({ render: function() { return (

{this.props.post.name}

{this.props.post.headline}

{this.props.post.commentsCount} ); } });

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@rstankov Thanks :)