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---
---
<!doctype html>
<html class="default no-js">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>ParamTypeDefinition | UI-Router</title>
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<a href="params.paramtypedefinition.html">ParamTypeDefinition</a>
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<h1>Interface ParamTypeDefinition</h1>
</div>
</div>
</header>
<div class="container container-main">
<div class="row">
<div class="col-8 col-content">
<section class="tsd-panel tsd-comment">
<div class="tsd-comment tsd-typography">
<div class="lead">
<p>Definition for a custom <a href="../classes/params.paramtype.html">ParamType</a></p>
</div>
<p>A developer can create a custom parameter type definition to customize the encoding and decoding of parameter values.
The definition should implement all the methods of this interface.</p>
<p>Parameter values are parsed from the URL as strings.
However, it is often useful to parse the string into some other form, such as:</p>
<ul>
<li>integer</li>
<li>date</li>
<li>array of <integer/date/string></li>
<li>custom object</li>
<li>some custom string representation</li>
</ul>
<p>Typed parameter definitions control how parameter values are encoded (to the URL) and decoded (from the URL).
UI-Router always provides the decoded parameter values to the user from methods such as <a href="../classes/transition.transition-1.html#params">Transition.params</a>.</p>
<p>For example, if a state has a url of <code>/foo/{fooId:int}</code> (the <code>fooId</code> parameter is of the <code>int</code> ParamType)
and if the browser is at <code>/foo/123</code>, then the 123 is parsed as an integer:</p>
<pre><code class="lang-js"><span class="hljs-keyword">var</span> fooId = transition.params().fooId;
fooId === <span class="hljs-string">"123"</span> <span class="hljs-comment">// false</span>
fooId === <span class="hljs-number">123</span> <span class="hljs-comment">// true</span>
</code></pre>
<h4 id="examples">Examples</h4>
<p>This example encodes an array of integers as a dash-delimited string to be used in the URL.</p>
<p>If we call <code>$state.go('foo', { fooIds: [20, 30, 40] });</code>, the URL changes to <code>/foo/20-30-40</code>.
If we navigate to <code>/foo/1-2-3</code>, the <code>foo</code> state's onEnter logs <code>[1, 2, 3]</code>.</p>
<dl class="tsd-comment-tags">
<dt>example</dt>
<dd><pre><code>
$urlMatcherFactoryProvider.type(<span class="hljs-string">'intarray'</span>, {
<span class="hljs-regexp">//</span> Take an array <span class="hljs-keyword">of</span> ints [<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>] <span class="hljs-keyword">and</span> <span class="hljs-keyword">return</span> a string <span class="hljs-string">"1-2-3"</span>
encode: <span class="hljs-function"><span class="hljs-params">(array)</span> =></span> array.join(<span class="hljs-string">"-"</span>),
<span class="hljs-regexp">//</span> Take an string <span class="hljs-string">"1-2-3"</span> <span class="hljs-keyword">and</span> <span class="hljs-keyword">return</span> an array <span class="hljs-keyword">of</span> ints [<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>]
decode: <span class="hljs-function"><span class="hljs-params">(str)</span> =></span> str.split(<span class="hljs-string">"-"</span>).map(x => parseInt(x, <span class="hljs-number">10</span>)),
<span class="hljs-regexp">//</span> Match the encoded string <span class="hljs-keyword">in</span> the URL
pattern: <span class="hljs-keyword">new</span> RegExp(<span class="hljs-string">"[0-9]+(?:-[0-9]+)*"</span>)
<span class="hljs-regexp">//</span> Ensure that the (decoded) object <span class="hljs-keyword">is</span> an array, <span class="hljs-keyword">and</span> that all its elements are numbers
is: <span class="hljs-function"><span class="hljs-params">(obj)</span> =></span> Array.isArray(obj) &&
obj.reduce(<span class="hljs-function"><span class="hljs-params">(acc, item)</span> =></span> acc && <span class="hljs-keyword">typeof</span> item === <span class="hljs-string">'number'</span>, <span class="hljs-literal">true</span>),
<span class="hljs-regexp">//</span> Compare two arrays <span class="hljs-keyword">of</span> integers
equals: <span class="hljs-function"><span class="hljs-params">(array1, array2)</span> =></span> array1.length === array2.length &&
array1.reduce(<span class="hljs-function"><span class="hljs-params">(acc, item, idx)</span> =></span> acc && item === array2[idx], <span class="hljs-literal">true</span>);
});
$stateProvider.state(<span class="hljs-string">'foo'</span>, {
url: <span class="hljs-string">"/foo/{fooIds:intarray}"</span>,
onEnter: function($transition$) {
<span class="hljs-built_in">console</span>.log($transition$.fooIds); <span class="hljs-regexp">//</span> Logs <span class="hljs-string">"[1, 2, 3]"</span>
}
});
</code></pre><p>This example decodes an integer from the URL.
It uses the integer as an index to look up an item from a static list.
That item from the list is the decoded parameter value.</p>
</dd>
<dt>example</dt>
<dd><pre><code>
<span class="hljs-keyword">var</span> <span class="hljs-keyword">list</span> = [<span class="hljs-string">'John'</span>, <span class="hljs-string">'Paul'</span>, <span class="hljs-string">'George'</span>, <span class="hljs-string">'Ringo'</span>];
$urlMatcherFactoryProvider.type(<span class="hljs-string">'listItem'</span>, {
encode: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(item)</span> </span>{
<span class="hljs-comment">// Represent the list item in the URL using its corresponding index</span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">list</span>.indexOf(item);
},
decode: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(item)</span> </span>{
<span class="hljs-comment">// Look up the list item by index</span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">list</span>[parseInt(item, <span class="hljs-number">10</span>)];
},
is: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(item)</span> </span>{
<span class="hljs-comment">// Ensure the item is valid by checking to see that it appears</span>
<span class="hljs-comment">// in the list</span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">list</span>.indexOf(item) > <span class="hljs-number">-1</span>;
}
});
$stateProvider.state(<span class="hljs-string">'list'</span>, {
url: <span class="hljs-string">"/list/{item:listItem}"</span>,
controller: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">($scope, $stateParams)</span> </span>{
console.log($stateParams.item);
}
});
<span class="hljs-comment">// ...</span>
<span class="hljs-comment">// Changes URL to '/list/3', logs "Ringo" to the console</span>
$state.go(<span class="hljs-string">'list'</span>, { item: <span class="hljs-string">"Ringo"</span> });
</code></pre><p>See: <a href="../classes/url.urlmatcherfactory.html#type">UrlMatcherFactory.type</a></p>
</dd>
</dl>
</div>
</section>
<section class="tsd-panel tsd-hierarchy">
<h3>Hierarchy</h3>
<ul class="tsd-hierarchy">
<li>
<span class="target">ParamTypeDefinition</span>
</li>
</ul>
</section>
<section class="tsd-panel">
<h3>Implemented by</h3>
<ul class="tsd-hierarchy">
<li><a href="../classes/params.paramtype.html" class="tsd-signature-type">ParamType</a></li>
</ul>
</section>
<section class="tsd-panel-group tsd-index-group">
<h2>Index</h2>
<section class="tsd-panel tsd-index-panel">
<div class="tsd-index-content">
<section class="tsd-index-section ">
<h3>Properties</h3>
<ul class="tsd-index-list">
<li class="tsd-kind-property tsd-parent-kind-interface"><a href="params.paramtypedefinition.html#pattern" class="tsd-kind-icon">pattern</a></li>
</ul>
</section>
<section class="tsd-index-section ">
<h3>Methods</h3>
<ul class="tsd-index-list">
<li class="tsd-kind-method tsd-parent-kind-interface"><a href="params.paramtypedefinition.html#decode" class="tsd-kind-icon">decode</a></li>
<li class="tsd-kind-method tsd-parent-kind-interface"><a href="params.paramtypedefinition.html#encode" class="tsd-kind-icon">encode</a></li>
<li class="tsd-kind-method tsd-parent-kind-interface"><a href="params.paramtypedefinition.html#equals" class="tsd-kind-icon">equals</a></li>
<li class="tsd-kind-method tsd-parent-kind-interface"><a href="params.paramtypedefinition.html#is" class="tsd-kind-icon">is</a></li>
</ul>
</section>
</div>
</section>
</section>
<section class="tsd-panel-group tsd-member-group ">
<h2>Properties</h2>
<section class="tsd-panel tsd-member tsd-kind-property tsd-parent-kind-interface">
<a name="pattern" class="tsd-anchor"></a>
<!---->
<!--<h3>pattern</h3>-->
<!---->
<div class="tsd-signature tsd-kind-icon">pattern<span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">RegExp</span> <div class="tsd-header">
<p> A regular expression that matches the encoded parameter type </p>
</div>
</div>
<div class="tsd-declaration">
<div class="tsd-comment tsd-typography">
<div class="lead">
<p>A regular expression that matches the encoded parameter type</p>
</div>
<p>This regular expression is used to match the parameter type in the URL.</p>
<p>For example, if your type encodes as a dash-separated numbers, match that here:
<code>new RegExp("[0-9]+(?:-[0-9]+)*")</code>.</p>
<p>There are some limitations to these regexps:</p>
<ul>
<li>No capturing groups are allowed (use non-capturing groups: <code>(?: )</code>)</li>
<li>No pattern modifiers like case insensitive</li>
<li>No start-of-string or end-of-string: <code>/^foo$/</code></li>
</ul>
</div>
</div>
<aside class="tsd-sources">
<ul>
<li>Defined in <a href="https://github.com/angular-ui/ui-router/blob/b1e6337/src/params/interface.ts#L424">params/interface.ts:424</a></li>
</ul>
</aside>
</section>
</section>
<section class="tsd-panel-group tsd-member-group ">
<h2>Methods</h2>
<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
<a name="decode" class="tsd-anchor"></a>
<!---->
<!--<h3>decode</h3>-->
<!---->
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
<li class="tsd-signature tsd-kind-icon">decode<span class="tsd-signature-symbol">(</span>val<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span>, key<span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">any</span></li>
<li class="tsd-header">
<p> Decodes a parameter value string (from URL string or transition param) to a custom/native value. </p>
</li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<div class="lead">
<p>Decodes a parameter value string (from URL string or transition param) to a custom/native value.</p>
</div>
<p>For example, if your type decodes to an array of ints, then decode the string as an array of ints here:
<code>(str) => str.split("-").map(str => parseInt(str, 10))</code></p>
<p>Note: in general, <a href="params.paramtypedefinition.html#encode">encode</a> and <a href="params.paramtypedefinition.html#decode">decode</a> should be symmetrical. That is, <code>encode(decode(str)) === str</code></p>
</div>
<h4 class="tsd-parameters-title">Parameters</h4>
<ul class="tsd-parameters">
<li>
<h5>val: <span class="tsd-signature-type">string</span></h5>
: <div class="tsd-comment tsd-typography">
<p>The URL parameter value to decode.</p>
</div>
</li>
<li>
<h5>key <span class="tsd-flag ts-flagOptional">Optional</span>: <span class="tsd-signature-type">string</span></h5>
: <div class="tsd-comment tsd-typography">
<p>The name of the parameter in which <code>val</code> is stored. Can be used for meta-programming of <code>ParamType</code> objects.</p>
</div>
</li>
</ul>
<div class="tsd-returns">
<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">any</span></h4>
: <p>a custom representation of the URL parameter value.</p>
</div>
<hr>
<aside class="tsd-sources">
<ul>
<li>Defined in <a href="https://github.com/angular-ui/ui-router/blob/b1e6337/src/params/interface.ts#L396">params/interface.ts:396</a></li>
</ul>
</aside> </li>
</ul>
</section>
<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
<a name="encode" class="tsd-anchor"></a>
<!---->
<!--<h3>encode</h3>-->
<!---->
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
<li class="tsd-signature tsd-kind-icon">encode<span class="tsd-signature-symbol">(</span>val<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">any</span>, key<span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">Array</span><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">></span></li>
<li class="tsd-header">
<p> Encodes a custom/native type value to a string that can be embedded in a URL. </p>
</li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<div class="lead">
<p>Encodes a custom/native type value to a string that can be embedded in a URL.</p>
</div>
<p>Note that the return value does <em>not</em> need to be URL-safe (i.e. passed through <code>encodeURIComponent()</code>), it
only needs to be a representation of <code>val</code> that has been encoded as a string.</p>
<p>For example, if your type decodes to an array of ints, then encode the array of ints as a string here:
<code>(intarray) => intarray.join("-")</code></p>
<p>Note: in general, <a href="params.paramtypedefinition.html#encode">encode</a> and <a href="params.paramtypedefinition.html#decode">decode</a> should be symmetrical. That is, <code>encode(decode(str)) === str</code></p>
</div>
<h4 class="tsd-parameters-title">Parameters</h4>
<ul class="tsd-parameters">
<li>
<h5>val: <span class="tsd-signature-type">any</span></h5>
: <div class="tsd-comment tsd-typography">
<p>The value to encode.</p>
</div>
</li>
<li>
<h5>key <span class="tsd-flag ts-flagOptional">Optional</span>: <span class="tsd-signature-type">string</span></h5>
: <div class="tsd-comment tsd-typography">
<p>The name of the parameter in which <code>val</code> is stored. Can be used for meta-programming of <code>ParamType</code> objects.</p>
</div>
</li>
</ul>
<div class="tsd-returns">
<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">string</span>
<span class="tsd-signature-symbol"> | </span>
<span class="tsd-signature-type">Array</span><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">></span>
</h4>
: <p>a string representation of <code>val</code> that can be encoded in a URL.</p>
</div>
<hr>
<aside class="tsd-sources">
<ul>
<li>Defined in <a href="https://github.com/angular-ui/ui-router/blob/b1e6337/src/params/interface.ts#L382">params/interface.ts:382</a></li>
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<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
<a name="equals" class="tsd-anchor"></a>
<!---->
<!--<h3>equals</h3>-->
<!---->
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
<li class="tsd-signature tsd-kind-icon">equals<span class="tsd-signature-symbol">(</span>a<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">any</span>, b<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span></li>
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<p> Determines whether two decoded values are equivalent. </p>
</li>
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<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<div class="lead">
<p>Determines whether two decoded values are equivalent.</p>
</div>
<p>For example, if your type decodes to an array of ints, then check if the arrays are equal:
<code>(a, b) => a.length === b.length && a.reduce((acc, x, idx) => acc && x === b[idx], true)</code></p>
</div>
<h4 class="tsd-parameters-title">Parameters</h4>
<ul class="tsd-parameters">
<li>
<h5>a: <span class="tsd-signature-type">any</span></h5>
: <div class="tsd-comment tsd-typography">
<p>A value to compare against.</p>
</div>
</li>
<li>
<h5>b: <span class="tsd-signature-type">any</span></h5>
: <div class="tsd-comment tsd-typography">
<p>A value to compare against.</p>
</div>
</li>
</ul>
<div class="tsd-returns">
<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span></h4>
: <p><code>true</code> if the values are equivalent/equal, otherwise <code>false</code>.</p>
</div>
<hr>
<aside class="tsd-sources">
<ul>
<li>Defined in <a href="https://github.com/angular-ui/ui-router/blob/b1e6337/src/params/interface.ts#L408">params/interface.ts:408</a></li>
</ul>
</aside> </li>
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<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
<a name="is" class="tsd-anchor"></a>
<!---->
<!--<h3>is</h3>-->
<!---->
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
<li class="tsd-signature tsd-kind-icon">is<span class="tsd-signature-symbol">(</span>val<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">any</span>, key<span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span></li>
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<p> Tests if some object type is compatible with this parameter type </p>
</li>
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<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<div class="lead">
<p>Tests if some object type is compatible with this parameter type</p>
</div>
<p>Detects whether some value is of this particular type.
Accepts a decoded value and determines whether it matches this <code>ParamType</code> object.</p>
<p>If your custom type encodes the parameter to a specific type, check for that type here.
For example, if your custom type decodes the URL parameter value as an array of ints, return true if the
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If your type decodes the URL parameter value to a custom string, check that the string matches
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<p>Note: This method is <em>not used to check if the URL matches</em>.
It's used to check if a <em>decoded value is this type</em>.
Use <a href="params.paramtypedefinition.html#pattern">pattern</a> to check the URL.</p>
</div>
<h4 class="tsd-parameters-title">Parameters</h4>
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<li>
<h5>val: <span class="tsd-signature-type">any</span></h5>
: <div class="tsd-comment tsd-typography">
<p>The value to check.</p>
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<h5>key <span class="tsd-flag ts-flagOptional">Optional</span>: <span class="tsd-signature-type">string</span></h5>
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<p>If the type check is happening in the context of a specific <a href="../classes/url.urlmatcher.html">UrlMatcher</a> object,
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meta-programming of <code>ParamType</code> objects.</p>
</div>
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<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span></h4>
: <p><code>true</code> if the value matches the type, otherwise <code>false</code>.</p>
</div>
<hr>
<aside class="tsd-sources">
<ul>
<li>Defined in <a href="https://github.com/angular-ui/ui-router/blob/b1e6337/src/params/interface.ts#L365">params/interface.ts:365</a></li>
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