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<!DOCTYPE html>  <html lang="en"> <head> <meta charset="utf-8"> <title>CanJS - PropDefinition</title> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"> <link rel="stylesheet" type="text/css" href="./static/bundles/bit-docs-site/static.css"> <link rel="shortcut icon" sizes="16x16 24x24 32x32 48x48 64x64" href="/docs/images/canjs_favicon.ico"> <link rel="apple-touch-icon" sizes="57x57" href="../docs/images/canjs_favicon_57x57.png"> <link rel="apple-touch-icon-precomposed" sizes="57x57" href="../docs/images/canjs_favicon_57x57.png"> <link rel="apple-touch-icon" sizes="72x72" href="../docs/images/canjs_favicon_72x72.png"> <link rel="apple-touch-icon" sizes="114x114" href="../docs/images/canjs_favicon_114x114.png"> <link rel="apple-touch-icon" sizes="120x120" href="../docs/images/canjs_favicon_128x128.png"> <link rel="apple-touch-icon" sizes="144x144" href="../docs/images/canjs_favicon_144x144.png"> <link rel="apple-touch-icon" sizes="152x152" href="../docs/images/canjs_favicon_152x152.png"> <meta content="yes" name="apple-mobile-web-app-capable"> <meta name="apple-mobile-web-app-status-bar-style" content="white-translucent"> <script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-2302003-11', 'auto'); ga('send', 'pageview'); </script> </head> <body> <input type="checkbox" id="nav-trigger" class="nav-trigger"/> <label for="nav-trigger">Menu</label> <div id="everything"> <div id="left" class="column"> <div class="top-left"> <div class="brand"> <div class="logo"> <a href="../index.html" alt="CanJS"></a> <div class="dropdown project-dropdown"> <a href="https://donejs.com/">DoneJS</a> <a href="http://stealjs.com/">StealJS</a> <a href="http://jquerypp.com/">jQuery ++</a> <a href="https://funcunit.com/">FuncUnit</a> <a href="http://documentjs.com/">DocumentJS</a> </div> </div> <div class="version"> <div class="version-number"> 3.0.0 </div> <div class="dropdown version-dropdown"> <a href="https://v2.canjs.com">2.3.27</a> </div> </div> </div> <div class="search-bar"> <p>   </p> </div> </div> <div class="bottom-left"> <div class="social-side-container"> <ul class="social-side"> <li> <a class="header-mobile github" href="https://github.com/canjs/canjs" target="_blank"><img class="social-icon-small" src="../docs/images/github.png">Github</a> </li> <li> <a class="header-mobile twitter" href="https://twitter.com/canjs" target="_blank"><img class="social-icon-small" src="../docs/images/twitter.png">Twitter</a> </li> </ul> <ul class="social-side"> <li> <a class="header-mobile" href="https://gitter.im/canjs/canjs" target="_blank">Chat</a> </li> <li> <a class="header-mobile" href="http://forums.donejs.com/c/canjs" target="_blank">Forum</a> </li> </ul> </div> <ul> <li class=" "> <a class="page" href="guides.html" title="Welcome to CanJS! 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These behaviors can be specified with as an <code>Object</code>, <code>String</code>, <code>Constructor</code> function, <code>Array</code>, a <code>getter expression</code>, or <code>setter expression</code>.</p> </section> </section> <section class="on-this-page-table"> </section> <section class="title-footer"> <ul class="title-links">  <li><a href="//github.com/canjs/can-define/tree/v1.0.4/docs/types.propDefinition.md">source</a></li>   </ul> </section> <div class="signature"> <h2 class="signature-title"> <code>Object</code> </h2> <p>Defines multiple behaviors for a single property.</p> <pre><code class="language-js">propertyName: { get: function(){ ... }, set: function(){ ... }, type: function(){ ... }, Type: Constructor, value: function(){ ... }, Value: Constructor, serialize: function(){ ... } } </code></pre> <div class="options"> <h3 class="options-title">Options</h3> <ul> <li> <b>value</b> <code>{<a href="can-define.types.value.html" title="Returns the default value for instances of the defined type. The default value is defined on demand, when the property is read for the first time.">value</a>()}</code>: <p>Specifies the initial value of the property or a function that returns the initial value.</p> <pre><code class="language-js">// A default age of `0`: var Person = DefineMap.extend({ age: { value: 0 }, address: { value: function(){ return {city: "Chicago", state: "IL"}; }; } }); </code></pre> </li> <li> <b>Value</b> <code>{<a href="can-define.types.ValueConstructor.html" title="Provides a constructor function to be used to provide a default value for a property.">Value</a>()}</code>: <p>Specifies a function that will be called with <code>new</code> whose result is set as the initial value of the attribute.</p> <pre><code class="language-js">// A default empty DefineList of hobbies: var Person = DefineMap.extend({ hobbies: {Value: DefineList} }); new Person().hobbies //-> [] </code></pre> </li> <li> <b>type</b> <code>{<a href="can-define.types.type.html" title="Converts a value set on an instance into an appropriate value.">type</a>()}</code>: <p>Specifies the type of the property. The type can be specified as either a function that returns the type coerced value or one of the <a href="can-define.types.html" title="Defines the type, initial value, and get, set, and serialize behavior for an observable property. All type converters leave null and undefined as is except for the "htmlbool" type converter.">types</a> names.</p> <pre><code class="language-js">var Person = DefineMap.extend({ age: {type: "number"}, hobbies: { type: function(newValue){ if(typeof newValue === "string") { return newValue.split(",") } else if( Array.isArray(newValue) ) { return newValue; } } } }); </code></pre> </li> <li> <b>Type</b> <code>{<a href="can-define.types.TypeConstructor.html" title="Provides a constructor function to be used to convert any set value into an appropriate value.">Type</a>()}</code>: <p>A constructor function that takes the assigned property value as the first argument and called with new. For example, the following will call <code>new Address(newValue)</code> with whatever non null, undefined, or address type is set as a <code>Person</code>'s address property.</p> <pre><code class="language-js">var Address = DefineMap.extend({ street: "string", state: "string" }); var Person = DefineMap.extend({ address: {Type: Address} }); </code></pre> </li> <li> <b>set</b> <code>{<a href="can-define.types.set.html" title="Specify what happens when a property value is set.">set</a>(newVal, resolve)}</code>: <p>A set function that specifies what should happen when a property is set. <code>set</code> is called with the result of <code>type</code> or <code>Type</code>. The following defines a <code>page</code> setter that updates the map's offset:</p> <pre><code class="language-js">DefineMap.extend({ page: { set: function(newVal){ this.offset = (parseInt(newVal) - 1) * this.limit; } } }); </code></pre> </li> <li> <b>get</b> <code>{<a href="can-define.types.get.html" title="Specify what happens when a certain property is read on a map. get functions work like a can-compute and automatically update themselves when a dependent observable value is changed.">get</a>(lastSetValue)}</code>: <p>A function that specifies how the value is retrieved. The get function is converted to an <a href="can-compute.async.html" title="Create a compute that can set its value after the computed function has been called.">async compute</a>. It should derive its value from other values on the object. The following defines a <code>page</code> getter that reads from a map's offset and limit:</p> <pre><code class="language-js">DefineMap.extend({ page: { get: function (newVal) { return Math.floor(this.offset / this.limit) + 1; } } }); </code></pre> <p>A <code>get</code> definition makes the property <strong>computed</strong> which means it will not be enumerable by default.</p> </li> <li> <b>serialize</b> <code>{<a href="can-define.types.serialize.html" title="Defines custom serialization behavior for a property.">serialize</a>()}</code>: <p>Specifies the behavior of the property when <a href="can-define/map/map.prototype.serialize.html" title="Get a serialized representation of the map instance and its children.">serialize</a> is called.</p> <p>By default, serialize does not include computed values. Properties with a <code>get</code> definition are computed and therefore are not added to the result. Non-computed properties values are serialized if possible and added to the result.</p> <pre><code class="language-js">var Todo = DefineMap.extend({ date: { type: "date", serialize: function(value) { return value.getTime(); } } }); </code></pre> </li> </ul> </div> </div> <div class="signature"> <h2 class="signature-title"> <code>String</code> </h2> <p>Defines a <a href="can-define.types.type.html" title="Converts a value set on an instance into an appropriate value.">type</a> converter as one of the named types in <a href="can-define.types.html" title="Defines the type, initial value, and get, set, and serialize behavior for an observable property. All type converters leave null and undefined as is except for the "htmlbool" type converter.">types</a>.</p> <pre><code class="language-js">propertyName: "typeName" </code></pre> </div> <div class="signature"> <h2 class="signature-title"> <code>function()</code> </h2> <p>Defines a <a href="can-define.types.TypeConstructor.html" title="Provides a constructor function to be used to convert any set value into an appropriate value.">Type</a> setting with a constructor function. Constructor functions are identified with <a href="can-util/js/types/types.isConstructor.html" title="can-util/js/types/types.isConstructor">isConstructor</a>.</p> <pre><code>propertyName: Constructor </code></pre> </div> <div class="signature"> <h2 class="signature-title"> <code>Array</code> </h2> <p>Defines an inline <a href="can-define/list/list.html" title="Create observable lists.">can-define/list/list</a> Type setting. This is used as a shorthand for creating a property that is an <a href="can-define/list/list.html" title="Create observable lists.">can-define/list/list</a> of another type.</p> <pre><code>propertyName: [Constructor | propDefinitions] </code></pre> <p>For example:</p> <pre><code class="language-js">users: [User], todos: [{complete: "boolean", name: "string"}] </code></pre> </div> <div class="signature"> <h2 class="signature-title"> <code>GETTER</code> </h2> <p>Defines a property's <a href="can-define.types.get.html" title="Specify what happens when a certain property is read on a map. get functions work like a can-compute and automatically update themselves when a dependent observable value is changed.">get</a> behavior with the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/get" title="syntax">syntax</a>.</p> <pre><code class="language-js">get propertyName(){ ... } </code></pre> <p>For example:</p> <pre><code class="language-js">get fullName() { return this.first + " " + this.last; } </code></pre> <p>This is a shorthand for providing an object with a <code>get</code> property like:</p> <pre><code>fullName: { get: function(){ return this.first + " " + this.last; } } </code></pre> <p>You must use an object with a <a href="can-define.types.get.html" title="Specify what happens when a certain property is read on a map. get functions work like a can-compute and automatically update themselves when a dependent observable value is changed.">get</a> property if you want your get to take the <code>lastSetValue</code> or <code>resolve</code> arguments.</p> </div> <div class="signature"> <h2 class="signature-title"> <code>SETTER</code> </h2> <p>Defines a property's <a href="can-define.types.set.html" title="Specify what happens when a property value is set.">set</a> behavior with the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/set">set syntax</a>.</p> <pre><code class="language-js">set propertyName(newValue){ ... } </code></pre> <p>For example:</p> <pre><code class="language-js">set fullName(newValue) { var parts = newVal.split(" "); this.first = parts[0]; this.last = parts[1]; } </code></pre> <p>This is a shorthand for providing an object with a <code>set</code> property like:</p> <pre><code>fullName: { set: function(newValue){ var parts = newVal.split(" "); this.first = parts[0]; this.last = parts[1]; } } </code></pre> <p>You must use an object with a <a href="can-define.types.set.html" title="Specify what happens when a property value is set.">set</a> property if you want your set to take the <code>resolve</code> argument.</p> </div> <section class="body"> <h2>Use</h2> <p>A property definition can be defined in several ways. The <code>Object</code> form is the most literal and directly represents a <code>PropDefinition</code> object. The other forms get converted to a <code>PropDefinition</code> as follows:</p> <pre><code class="language-js">DefineMap.extend({ propertyA: Object -> PropertyDefinition propertyB: String -> {type: String} propertyC: Constructor -> {Type: Constructor} propertyD: [PropDefs] -> {Type: DefineList.extend({"#": PropDefs})>} get propertyE(){...} -> {get: propertyE(){...}} set propertyF(){...} -> {get: propertyF(){...}} method: Function }) </code></pre> <p>Within a property definition, the available properties and their signatures look like:</p> <pre><code class="language-js">DefineMap.extend({ property: { get: function(lastSetValue, resolve){...}, set: function(newValue, resolve){...}, type: function(newValue, prop){...}| Array<PropertyDefinition> | PropertyDefinition, Type: Constructor | Array<PropertyDefinition> | PropertyDefinition, value: function(){...}, Value: Constructor, serialize: Boolean | function(){...} } }) </code></pre> <p>For example:</p> <pre><code class="language-js">var Person = DefineMap.extend("Person",{ // a `DefineList` of `Address` addresses: [Address], // A `DefineMap` with a `first` and `last` property name: { type: {first: "string", last: "string"} }, // A `DefineList of a ``DefineMap` with a `make` and `year` property. cars: { Type: [{make: "string", year: "number"}] } }); var person = new Person({ addresses: [{street: "1134 Pinetree"}], name: {first: "Kath", last: "Iann"} cars: [{ make: "Nissan", year: 2010 }] }); </code></pre> </section> <script type="text/javascript"> var docObject = {"src":{"path":"node_modules/can-define/docs/types.propDefinition.md"},"description":"\nDefines the type, initial value, and get, set, and serialize behavior for an\nobservable property. 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The following\ndefines a `page` getter that reads from a map's offset and limit:\n\n```js\nDefineMap.extend({\n page: {\n get: function (newVal) {\n\t return Math.floor(this.offset / this.limit) + 1;\n\t}\n }\n});\n```\n\nA `get` definition makes the property __computed__ which means it will not be enumerable by default.\n","types":[{"type":"can-define.types.get"}]},{"name":"serialize","description":"Specifies the behavior of the property when [can-define/map/map::serialize serialize] is called.\n\nBy default, serialize does not include computed values. Properties with a `get` definition\nare computed and therefore are not added to the result. Non-computed properties values are\nserialized if possible and added to the result.\n\n```js\nvar Todo = DefineMap.extend({\n date: {\n type: \"date\",\n serialize: function(value) {\n return value.getTime();\n }\n }\n});\n","types":[{"type":"can-define.types.serialize"}]}]},{"type":"String","description":"Defines a [can-define.types.type] converter as one of the named types in [can-define.types].\n\n```js\npropertyName: \"typeName\"\n```\n"},{"type":"Constructor","description":"Defines a [can-define.types.TypeConstructor Type] setting with a constructor\nfunction. Constructor functions are identified with [can-util/js/types/types.isConstructor].\n\n```\npropertyName: Constructor\n```\n"},{"type":"Array","description":"Defines an inline [can-define/list/list] Type setting. This is\nused as a shorthand for creating a property that is an [can-define/list/list] of another type.\n\n```\npropertyName: [Constructor | propDefinitions]\n```\n\nFor example:\n\n```js\nusers: [User],\ntodos: [{complete: \"boolean\", name: \"string\"}]\n```\n","options":[]},{"type":"GETTER","description":"Defines a property's [can-define.types.get] behavior with the\n[https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/get syntax].\n\n```js\nget propertyName(){ ... }\n```\n\nFor example:\n\n```js\nget fullName() {\n return this.first + \" \" + this.last;\n}\n```\n\nThis is a shorthand for providing an object with a `get` property like:\n\n```\nfullName: {\n get: function(){\n return this.first + \" \" + this.last;\n }\n}\n```\n\nYou must use an object with a [can-define.types.get] property if you want your get to take the `lastSetValue`\nor `resolve` arguments.\n"},{"type":"SETTER","description":"Defines a property's [can-define.types.set] behavior with the\n[set syntax](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/set).\n\n```js\nset propertyName(newValue){ ... }\n```\n\nFor example:\n\n```js\nset fullName(newValue) {\n var parts = newVal.split(\" \");\n this.first = parts[0];\n this.last = parts[1];\n}\n```\n\nThis is a shorthand for providing an object with a `set` property like:\n\n```\nfullName: {\n set: function(newValue){\n var parts = newVal.split(\" \");\n this.first = parts[0];\n this.last = parts[1];\n }\n}\n```\n\nYou must use an object with a [can-define.types.set] property if you want your set to take the `resolve` argument.\n\n"}],"name":"can-define.types.propDefinition","parent":"can-define.typedefs","comment":" ","pathToRoot":".."}; </script> </article> <footer><p>CanJS is part of <a href="http://donejs.com" target="_blank">DoneJS</a>. Created and maintained by the core <a href="https://donejs.com/About.html#section=section_Team" target="_blank">DoneJS team</a> and <a href="http://bitovi.com" target="_blank">Bitovi</a>. <strong>Currently 3.0.0.</strong></p></footer> </div> </div> </div> <script> steal = { instantiated: { "bundles/bit-docs-site/static.css!$css" : null } }; </script> <script type='text/javascript' data-main="bit-docs-site/static" src="./static/node_modules/steal/steal.production.js"></script> <script async defer src="https://buttons.github.io/buttons.js"></script> </body> </html>