45 lines
1.8 KiB
Plaintext
45 lines
1.8 KiB
Plaintext
caption: jsonvariable
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created: 20240506131935424
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modified: 20240506151517068
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op-input: a selection variable names
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op-output: the JSON string values of each of the retrieved properties
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op-parameter: one or more indexes of the property to retrieve
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op-parameter-name: R
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op-purpose: retrieve the JSON string from a ~TiddlyWiki variable
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tags: [[Filter Operators]] [[JSON Operators]]
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title: jsonvariable Operator
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type: text/vnd.tiddlywiki
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\procedure testProc() [[aa aa]] bb
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\function fn.test(splitChar:" " not-used) [enlist<testProc>format:titlelist[]]
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\function tab() [charcode[9]]
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<<.from-version "5.3.4">>
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The <<.op jsonvariable>> operator is used to retrieve variables as JSON substrings. See also the following related operators:
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Properties within a JSON object are identified by a sequence of indexes. In the following example, we use a procedure: `testProc` and a function: `fn.test` to show the possibilities of <<.op jsonvariable>>. The `tab`-function is needed for the <<.olink format>> ooperator, which is used to "pretty-print" the output.
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```
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\procedure testProc() [[aa aa]] bb
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\function fn.test(splitChar:" " not-used) [enlist<testProc>format:titlelist[]]
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\function tab() [charcode[9]]
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<pre><code><$text text={{{[[fn.test]jsonvariable[]format:json<tab>]}}}/></code></pre>
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```
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Which results to:
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<pre><code><$text text={{{[[fn.test]jsonvariable[]format:json<tab>]}}}/></code></pre>
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Also see:
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* <<.olink jsonextract>> to retrieve a JSON value as a string of JSON
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* <<.olink jsonget>> to retrieve the values of a property in JSON data
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* <<.olink jsontype>> to retrieve the type of a JSON value
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* <<.olink jsonindexes>> to retrieve the names of the fields of a JSON object, or the indexes of a JSON array
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Every TW variable has this internal structure, which we can use to extract the info we need.
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!! <<.operator-examples "jsonvariable">> |