interface that needs to be designed https://www.flickr.com/photos/darpi/212323100/in/photolist-jLdg7-4zEiwa-nwFCR-cZVtBE-4NHtnv-7daytd-pce3y-4NH3fh-5TLS72-58aMX7-58aMVN-a3826y-gVDVKr-8DRhUB-nEdkNf-6tnApQ- fqJRqv-4NMHx7-7fUPoM-cNu2W-8etirE-o7PZA-wsB4L-7ABatu-8LyEF5-7iEjwY-3faCd1-9Gn1fF-4qYRms-JUKbE-7B97bb-69Uer5-5DQMzG-f4ZgsG-7TvUJp-5zyhEh-65naZh-nBkNs-5eCcAF-sErjv-4ePHGY-6kV1Q4- nxWYX-dpGR5-55vgqd-5scyot-5t7uJJ-nLQn5y-9Njbu-79B4aw
debugging) ❖ smaller api (fewer breaking changes) ❖ don’t need to go everywhere a component was used to update the dom if it changes ❖ lightning fast dom updates when data changes ❖ not managing those updates manually ❖ simpler APIs (tabs example)
what HTML to render. var Media = React.createClass({ render: function () { return ( <p> {this.props.children} </p> ); } }); just render a paragraph, for now tell React where to render children
This text is our component’s children! </Media> ! ! ! ! <p> This text is our component’s children! </p> When React renders that component we get this html
This text is our component’s children! </Media> ! ! ! ! <p> This text is our component’s children! </p> {this.props.children} When React renders that component we get this html
function to set the src of the image <Media leftImageSource='http://placehold.it/50x50'> Media block content </Media> React props are a lot like HTML attributes
leftImageAlt="profile photo" leftImageHeight="50px" leftImageWidth="50px"> Media block content </Media> Explicit height and width allow the browser to do a single rendering/painting pass
attribute <Media leftImageSource='http://placehold.it/50x50' leftImageHref='http://www.google.com' leftImageAlignment='middle' leftImageAlt="profile photo" leftImageHeight="50px" leftImageWidth="50px" leftImageSpacing="medium"> Media block content </Media> For when the 10px default spacing isn’t right, like a tiny icon with text
leftImageSource='http://placehold.it/50x50' leftImageHref='http://www.google.com' leftImageAlignment='middle' leftImageAlt="profile photo" leftImageHeight="50px" leftImageWidth="50px" leftImageSpacing="medium" stackSize='medium'> Media block content </Media> stack size puts the image above the text at the breakpoint
does What works? ❖ We're basically recreating html in React, yuck! (we shouldn’t make a new different alt attribute! ❖ We have image properties and media properties all mixed up ❖ We have too many properties What doesn’t work?
images={images} bodyAlignment='middle' stackSize='medium'> Media block content </Media> {curly braces} mean it’s a JavaScript variable rather than a string
images={images} bodyAlignment='middle' stackSize='medium'> Media block content </Media> json goes into the images attribute {curly braces} mean it’s a JavaScript variable rather than a string
in JSON means all the code isn't in the same place ❖ weird to have JSON in the middle of what looks like markup ❖ still reinventing html attributes of an <img> tag ❖ cleaner separation of concerns (media takes care of media stuff, rather than the properties of its children)
children https://www.flickr.com/photos/i-am-mclovin/16535518502/in/photolist-rcbRyA-nshV4n-eAaqTz-bCfUFZ-jH4tBF-pctQQD-qNmfZS-eT3GMZ-bTJsji-N8LkW-iCxgoA-7JDTp2-mPGu7V-dV4m7G-igpkaV-dRobZv-mnUN9i-igoYgJ-bCzBBi- f9tdxa-oMiWTE-b6LMzz-rcTY6S-dYq12b-qUh6hV-f6oFCx-pmwC9Z-hNLucH-moYnBt-6uGwja-aRrBm4-mPGGDB-igp6YC-f8b3QR-igpkXB-igoY3C-o62zzh-iC3JNn-9217QQ-D3JPG-pcHyUy-pprMfU-igoJAg-hgRxSL-pqomg9- ahQDpD-4LkbKg-hNLcDy-igoJb8-9STs34
body content need to be in a very particular order, it seems weird to expose that to the user ❖ Violates the "build components you can use without understanding CSS” principle ❖ Normal HTML ❖ Facebook does it this way
and reorder them, but how do we tell the difference between content images and media images? ❖ We were still discovering React, and didn't know how to loop over children yet ❖ React provides handy error messages and property validations. We would lose out on that if we made the images children ❖ Facebook's images aren't optional, so it's a different case
the JSON example <Media leftImage={leftImage} rightImage={rightImage} bodyAlignment='middle' stackSize='medium'> Media block content </Media> left and right images are passed into attributes
attribute (in the latter example) is a bit odd, though it does have advantages. ❖ React passes default html attributes in to the resulting img tag, so we don't have to do anything special with height, width, src, aria and alt. ❖ We separate concerns and the image takes care of it's own properties ❖ No need to parse content
So our image will have an href attribute. I like clean html, and that feels weird to me! <div class="media"> <a href="styleguide.pivotal.io"> <img href="styleguide.pivotal.io" /> ... Yuck!
Image = React.createClass({ render() { var {href, src, children, className, ...other} = this.props; ! var image = <img {...other} src={src} className={classes}>; ! return href ? <a {...{href}}>{image}</a> : image; } }); get the properties we need build the image from our properties if we have a link, wrap the image in an <a> tag
if the boolean is true var Image = React.createClass({ render() { var {responsive, href, src, children, className, ...other} = this.props; ! var classes = classnames({'img-responsive': responsive}, className); ! ! ! ! ! ! ! var image = <img {...other} src={src} className={classes}>{children}</img>; return href ? <a {...{href}}>{image}</a> : image; } }); add this class if this evaluates to true
if the boolean is true var Image = React.createClass({ render() { var {responsive, href, src, children, className, ...other} = this.props; ! var classes = classnames({'img-responsive': responsive}, className); ! ! ! ! ! ! ! var image = <img {...other} src={src} className={classes}>{children}</img>; return href ? <a {...{href}}>{image}</a> : image; } }); add this class if this evaluates to true then, put the class on the image
changed the media component to default to top alignment if nothing else was specified. ❖ We created the <flag> component <Flag leftImage={refreshImage}> refresh </Flag>
know what the flag object is, documentation and teaching help ❖ with Flag and Media, we no longer need to specify alignment unless we want something weird
Set good defaults ❖ User shouldn’t need to understand CSS to use it ❖ Make tiny components with one job (same as CSS) ❖ Allow flexibility ❖ Prefer a complex implementation over a complex interface what has worked for us
building features, actual product users https://www.flickr.com/photos/fabiansociety/16300828766/in/photolist-qQs1tQ-qAa8pJ-pVJmYw-qxNcH4-qAaDuJ-qSHJsr-5SDe5H-josG7R-dxrFDm-e6S4TN-fddCLi-po7JuN-d21PZN-ax7LAK-qBLEie-dEMphp-byfU17-nPjAPc-eZ7ooX- ctHbf5-g5QFS-naVVhZ-cFgo6s-akEb2Q-qUQi3c-aGJ83i-627cGv-aRFFNx-nSyXpr-dyXFU7-aupkvk-buYgB2-nj7Xyv-jHSXR5-9eAqzK-eNqYdm-a4GaUk-qiFrdF-dy1QsG-bPqzrk-9dEUm7-n7cmgE-gJNeKz-nigszh-mi4QjT-s76Yxa-
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