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</ script ></ nav ></ div >< div class = "container mainContainer docMainContainer" >< div class = "wrapper" >< div class = "post" >< header class = "postHeader" >< h1 class = "postHeaderTitle" > View</ h1 ></ header >< article >< div >< span >< p > Views are defined by using < a href = "https://github.com/weavejester/hiccup/wiki/Syntax" > Hiccup syntax</ a > , itself a subset of EDN. This syntax is closely related to JSON, is based on pure data, and offers an expressive way of defining declarative interfaces.</ p >
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< p > The general format of a UI is [component properties & children], where :</ p >
< ul >
< li > component is a symbol, one of Status components</ li >
< li > properties is an optional map (keyword-to-value) of component properties</ li >
< li > children is an optional sequence of the component definitions</ li >
</ ul >
< p > Because components are built recursively, on top of other components, they are inherently composable and reusable.</ p >
< h1 >< a class = "anchor" aria-hidden = "true" id = "blocks" ></ a >< a href = "#blocks" aria-hidden = "true" class = "hash-link" >< svg class = "hash-link-icon" aria-hidden = "true" height = "16" version = "1.1" viewBox = "0 0 16 16" width = "16" >< path fill-rule = "evenodd" d = "M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z" ></ path ></ svg ></ a > Blocks</ h1 >
< p > While powerful the Hiccup syntax is about describing static UIs. Blocks enhance it by providing dynamicity based on data content.</ p >
< h2 >< a class = "anchor" aria-hidden = "true" id = "let-block" ></ a >< a href = "#let-block" aria-hidden = "true" class = "hash-link" >< svg class = "hash-link-icon" aria-hidden = "true" height = "16" version = "1.1" viewBox = "0 0 16 16" width = "16" >< path fill-rule = "evenodd" d = "M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z" ></ path ></ svg ></ a > Let block</ h2 >
< p > Let blocks are general blocks allowing views to access data (via lexical scoping).</ p >
< h3 >< a class = "anchor" aria-hidden = "true" id = "query" ></ a >< a href = "#query" aria-hidden = "true" class = "hash-link" >< svg class = "hash-link-icon" aria-hidden = "true" height = "16" version = "1.1" viewBox = "0 0 16 16" width = "16" >< path fill-rule = "evenodd" d = "M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z" ></ path ></ svg ></ a > Query</ h3 >
< p > Let blocks enable access to data via < a href = "Query" > Queries</ a > .</ p >
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< pre >< code class = "hljs css language-clojure" >< span class = "token punctuation" > (</ span >< span class = "token keyword" > let</ span > < span class = "token punctuation" > [</ span > value @queries/some-query< span class = "token punctuation" > ]</ span >
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< span class = "token comment" > ;; value is available there</ span >
< span class = "token punctuation" > )</ span >
</ code ></ pre >
< h3 >< a class = "anchor" aria-hidden = "true" id = "destructuring" ></ a >< a href = "#destructuring" aria-hidden = "true" class = "hash-link" >< svg class = "hash-link-icon" aria-hidden = "true" height = "16" version = "1.1" viewBox = "0 0 16 16" width = "16" >< path fill-rule = "evenodd" d = "M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z" ></ path ></ svg ></ a > Destructuring</ h3 >
< p > Let blocks also allow to destructure data (sequences and maps) to access nested information.</ p >
< pre >< code class = "hljs" > (< span class = "hljs-name" >< span class = "hljs-builtin-name" > let</ span ></ span > [{key < span class = "hljs-symbol" > :key</ span > } {< span class = "hljs-symbol" > :key</ span > < span class = "hljs-string" > "value"</ span > }]
< span class = "hljs-comment" > ;; key is available there with the value "value"</ span >
)
</ code ></ pre >
< h4 >< a class = "anchor" aria-hidden = "true" id = "sequential-data-structure" ></ a >< a href = "#sequential-data-structure" aria-hidden = "true" class = "hash-link" >< svg class = "hash-link-icon" aria-hidden = "true" height = "16" version = "1.1" viewBox = "0 0 16 16" width = "16" >< path fill-rule = "evenodd" d = "M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z" ></ path ></ svg ></ a > Sequential data structure</ h4 >
< p > Extract seq elements by index
Elements can be ignored with < code > _</ code >
< code > :as symbol</ code > denotes the whole sequence</ p >
< h5 >< a class = "anchor" aria-hidden = "true" id = "examples" ></ a >< a href = "#examples" aria-hidden = "true" class = "hash-link" >< svg class = "hash-link-icon" aria-hidden = "true" height = "16" version = "1.1" viewBox = "0 0 16 16" width = "16" >< path fill-rule = "evenodd" d = "M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z" ></ path ></ svg ></ a > Examples</ h5 >
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< pre >< code class = "hljs css language-clojure" >< span class = "token punctuation" > [</ span >< span class = "token punctuation" > [</ span >< span class = "token number" > a</ span > _ < span class = "token number" > c</ span > < span class = "token operator" > :as</ span > all< span class = "token punctuation" > ]</ span > < span class = "token punctuation" > [</ span >< span class = "token number" > 1</ span > < span class = "token number" > 2</ span > < span class = "token number" > 3</ span > < span class = "token number" > 4</ span > < span class = "token number" > 5</ span >< span class = "token punctuation" > ]</ span >< span class = "token punctuation" > ]</ span >
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< span class = "token comment" > ;; a = 1</ span >
< span class = "token comment" > ;; c = 3</ span >
< span class = "token comment" > ;; all = [1 2 3 4 5]</ span >
</ code ></ pre >
< h4 >< a class = "anchor" aria-hidden = "true" id = "associative-data-structure" ></ a >< a href = "#associative-data-structure" aria-hidden = "true" class = "hash-link" >< svg class = "hash-link-icon" aria-hidden = "true" height = "16" version = "1.1" viewBox = "0 0 16 16" width = "16" >< path fill-rule = "evenodd" d = "M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z" ></ path ></ svg ></ a > Associative data structure</ h4 >
< p > Extract map values by keys < code > {a :a}</ code >
Optional values via < code > [a 5]</ code >
No namespaced keyword support, no short syntax</ p >
< h5 >< a class = "anchor" aria-hidden = "true" id = "examples-1" ></ a >< a href = "#examples-1" aria-hidden = "true" class = "hash-link" >< svg class = "hash-link-icon" aria-hidden = "true" height = "16" version = "1.1" viewBox = "0 0 16 16" width = "16" >< path fill-rule = "evenodd" d = "M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z" ></ path ></ svg ></ a > Examples</ h5 >
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< pre >< code class = "hljs css language-clojure" >< span class = "token punctuation" > [</ span >< span class = "token punctuation" > {</ span >< span class = "token number" > a</ span > < span class = "token operator" > :a</ span > < span class = "token number" > a</ span > < span class = "token operator" > :b</ span > < span class = "token punctuation" > [</ span >< span class = "token number" > c</ span > < span class = "token number" > 4</ span >< span class = "token punctuation" > ]</ span > < span class = "token operator" > :c</ span > < span class = "token operator" > :all</ span > all< span class = "token punctuation" > }</ span > < span class = "token punctuation" > {</ span >< span class = "token operator" > :a</ span > < span class = "token number" > 1</ span > < span class = "token operator" > :b</ span > < span class = "token number" > 2</ span > < span class = "token operator" > :d</ span > < span class = "token number" > 3</ span >< span class = "token punctuation" > }</ span >< span class = "token punctuation" > ]</ span >
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< span class = "token comment" > ;; a = 1</ span >
< span class = "token comment" > ;; b = 2</ span >
< span class = "token comment" > ;; c = 4</ span >
< span class = "token comment" > ;; all = {:a 1 :b 2 :d 3}</ span >
</ code ></ pre >
< h5 >< a class = "anchor" aria-hidden = "true" id = "nesting" ></ a >< a href = "#nesting" aria-hidden = "true" class = "hash-link" >< svg class = "hash-link-icon" aria-hidden = "true" height = "16" version = "1.1" viewBox = "0 0 16 16" width = "16" >< path fill-rule = "evenodd" d = "M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z" ></ path ></ svg ></ a > Nesting</ h5 >
< p > Both structure type destrucuring can be combined</ p >
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< pre >< code class = "hljs css language-clojure" >< span class = "token punctuation" > [</ span >< span class = "token punctuation" > {</ span >< span class = "token punctuation" > [</ span >< span class = "token number" > a1</ span > _ < span class = "token number" > a3</ span >< span class = "token punctuation" > ]</ span > < span class = "token operator" > :a</ span > < span class = "token punctuation" > {</ span >< span class = "token number" > d</ span > < span class = "token operator" > :d</ span > #< span class = "token punctuation" > {</ span >< span class = "token number" > f</ span > < span class = "token number" > 7</ span >< span class = "token punctuation" > }</ span > < span class = "token operator" > :f</ span > < span class = "token punctuation" > [</ span >< span class = "token punctuation" > [</ span > _ g2< span class = "token punctuation" > ]</ span > < span class = "token number" > 8</ span >< span class = "token punctuation" > }</ span >< span class = "token punctuation" > ]</ span > < span class = "token operator" > :b</ span > < span class = "token punctuation" > [</ span > _ < span class = "token number" > e2</ span >< span class = "token punctuation" > ]</ span > < span class = "token operator" > :e</ span > < span class = "token operator" > :all</ span > all< span class = "token punctuation" > }</ span >
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< span class = "token punctuation" > {</ span >< span class = "token operator" > :a</ span > < span class = "token punctuation" > [</ span >< span class = "token number" > 1</ span > < span class = "token number" > 2</ span > < span class = "token number" > 3</ span >< span class = "token punctuation" > ]</ span > < span class = "token operator" > :b</ span > < span class = "token punctuation" > {</ span >< span class = "token operator" > :d</ span > < span class = "token number" > 4</ span > < span class = "token operator" > :e</ span > < span class = "token punctuation" > [</ span >< span class = "token number" > 5</ span > < span class = "token number" > 6</ span >< span class = "token punctuation" > ]</ span > < span class = "token operator" > :g</ span > < span class = "token punctuation" > [</ span >< span class = "token number" > 9</ span > < span class = "token number" > 10</ span >< span class = "token punctuation" > ]</ span >< span class = "token punctuation" > }</ span >< span class = "token punctuation" > }</ span >< span class = "token punctuation" > ]</ span >
< span class = "token comment" > ;; a1 = 1</ span >
< span class = "token comment" > ;; a3 = 3</ span >
< span class = "token comment" > ;; d = 4</ span >
< span class = "token comment" > ;; e2 = 5</ span >
< span class = "token comment" > ;; f = 7</ span >
< span class = "token comment" > ;; g2 = 10</ span >
< span class = "token comment" > ;; all = {:a [1 2 3] :b {:d 4 :e [5 6] :g [9 10]}}</ span >
</ code ></ pre >
< h1 >< a class = "anchor" aria-hidden = "true" id = "if-when-blocks" ></ a >< a href = "#if-when-blocks" aria-hidden = "true" class = "hash-link" >< svg class = "hash-link-icon" aria-hidden = "true" height = "16" version = "1.1" viewBox = "0 0 16 16" width = "16" >< path fill-rule = "evenodd" d = "M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z" ></ path ></ svg ></ a > If/when blocks</ h1 >
< p > If and when blocks will make their content available only if associated condition holds true.</ p >
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< pre >< code class = "hljs css language-clojure" >< span class = "token punctuation" > (</ span >< span class = "token keyword" > when</ span > condition?
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< span class = "token punctuation" > [</ span > text < span class = "token punctuation" > {</ span >< span class = "token punctuation" > }</ span >
< span class = "token string" > ""</ span >< span class = "token punctuation" > ]</ span >< span class = "token punctuation" > )</ span >
</ code ></ pre >
2018-10-04 13:50:25 +02:00
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