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<!DOCTYPE html><html lang="en" style="font-size:16px"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><link rel="icon" href="https://www.sitespeed.io/img/ico/sitespeed.io-144.png"><meta name="author" content="Peter Hedenskog"><meta name="description" content="Tutorials and documentation for scripting in Browsertime and sitespeed.io"><meta name="keywords" content="scripting, tutorial, sitespeed.io, browsertime, web performance"><title>Class: Measure</title><!--[if lt IE 9]>
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href="Screenshot.html">Screenshot</a></div><div class="sidebar-section-children"><a href="Scroll.html">Scroll</a></div><div class="sidebar-section-children"><a href="Select.html">Select</a></div><div class="sidebar-section-children"><a href="Set.html">Set</a></div><div class="sidebar-section-children"><a href="SingleClick.html">SingleClick</a></div><div class="sidebar-section-children"><a href="StopWatch.html">StopWatch</a></div><div class="sidebar-section-children"><a href="Switch.html">Switch</a></div><div class="sidebar-section-children"><a href="Wait.html">Wait</a></div></div></div></div></div><div class="navbar-container" id="VuAckcnZhf"><nav class="navbar"><div class="navbar-left-items"><div class="navbar-item"><a id="" href="." target="">Start</a></div><div class="navbar-item"><a id="" href="https://www.sitespeed.io/documentation/sitespeed.io/" target="">Back to documentation</a></div></div><div class="navbar-right-items"><div class="navbar-right-item"><button class="icon-button search-button" aria-label="open-search"><svg><use xlink:href="#search-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button theme-toggle" aria-label="toggle-theme"><svg><use class="theme-svg-use" xlink:href="#dark-theme-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button font-size" aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div><nav></nav></nav></div><div class="toc-container"><div class="toc-content"><span class="bold">On this page</span><div id="eed4d2a0bfd64539bb9df78095dec881"></div></div></div><div class="body-wrapper"><div class="main-content"><div class="main-wrapper"><section><header><h1 id="Measure-title" class="has-anchor">Measure</h1><div class="class-description">A measurement tool for browser-based metrics, handling various aspects of metric collection including navigation, video recording, and data collection.</div></header><article><div class="container-overview"></div><h2 id="classes" class="subsection-title has-anchor">Classes</h2><dl><dt><a href="Measure.html">Measure</a></dt><dd></dd></dl><h2 id="methods" class="subsection-title has-anchor">Methods</h2><h3 class="name has-anchor" id="add"><span class="type-signature"></span>add<span class="signature">(name, value)</span></h3><div class="description">Adds a custom metric to the current measurement result. This method should be called after a measurement has started and before it has stopped.</div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>name</code></td><td class="type"><span class="param-type">string</span></td><td class="description last">The name of the metric.</td></tr><tr><td class="name"><code>value</code></td><td class="type"><span class="param-type">*</span></td><td class="description last">The value of the metric.</td></tr></tbody></table></div><div class="method-member-container mt-20"><strong>Throws:</strong><dl><dt><div class="param-desc">Throws an error if called before a measurement cycle has started.</div></dt><dd></dd><dt><dl><dt>Type</dt><dd><span class="param-type">Error</span></dd></dl></dt><dd></dd></dl></div><h3 class="name has-anchor" id="addObject"><span class="type-signature"></span>addObject<span class="signature">(object)</span></h3><div class="description">Adds multiple custom metrics to the current measurement result. This method accepts an object containing multiple key-value pairs representing different metrics. Similar to `add`, it should be used within an active measurement cycle.</div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>object</code></td><td class="type"><span class="param-type">Object</span></td><td class="description last">An object containing key-value pairs of metrics to add.</td></tr></tbody></table></div><div class="method-member-container mt-20"><strong>Throws:</strong><dl><dt><div class="param-desc">Throws an error if called before a measurement cycle has started.</div></dt><dd></dd><dt><dl><dt>Type</dt><dd><span class="param-type">Error</span></dd></dl></dt><dd></dd></dl></div><h3 class="name has-anchor" id="start"><span class="type-signature">(async) </span>start<span class="signature">(urlOrAlias, optionalAlias<span class="signature-attributes">opt</span>)</span><span class="type-signature"> &rarr; {Promise.&lt;void>}</span></h3><div class="description">Starts the measurement process for a given URL or an alias. It supports starting measurements by either directly providing a URL or using an alias. If a URL is provided, it navigates to that URL and performs the measurement. If an alias is provided, or no URL is available, it sets up the environment for a user-driven navigation.</div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th>Attributes</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>urlOrAlias</code></td><td class="type"><span class="param-type">string</span></td><td class="attributes"></td><td class="description last">The URL to navigate to, or an alias representing the test.</td></tr><tr><td class="name"><code>optionalAlias</code></td><td class="type"><span class="param-type">string</span></td><td class="attributes">&lt;optional><br></td><td class="description last">An optional alias that can be used if the first parameter is a URL.</td></tr></tbody></table></div><div class="method-member-container mt-20"><strong>Throws:</strong><dl><dt><div class="param-desc">Throws an error if navigation fails or if there are issues in the setup process.</div></dt><dd></dd><dt><dl><dt>Type</dt><dd><span class="param-type">Error</span></dd></dl></dt><dd></dd></dl></div><div class="method-member-container mt-20"><strong>Returns:</strong><div class="param-desc">A promise that resolves when the start process is complete, or rejects if there are errors.</div><dl class="param-type"><dt>Type:&nbsp;</dt><dd><span class="param-type">Promise.&lt;void></span></dd></dl></div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Example</strong><div class="rel"><pre class="prettyprint"><code>await commands.measure.start('https://www.example.org');
// Or start the measurement and click on a link
await commands.measure.start();
await commands.click.byLinkTextAndWait('Documentation');
// Remember to stop the measurements if you do not provide a URL
await commands.measure.stop();</code></pre></div></div><h3 class="name has-anchor" id="stop"><span class="type-signature">(async) </span>stop<span class="signature">(testedStartUrl)</span><span class="type-signature"> &rarr; {Promise}</span></h3><div class="description">Stops the measurement process, collects metrics, and handles any post-measurement tasks. It finalizes the URL being tested, manages any URL-specific metadata, stops any ongoing video recordings, and initiates the data collection process.</div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>testedStartUrl</code></td><td class="type"><span class="param-type">string</span></td><td class="description last">The URL that was initially tested. If not provided, it will be obtained from the browser.</td></tr></tbody></table></div><div class="method-member-container mt-20"><strong>Throws:</strong><dl><dt><div class="param-desc">Throws an error if there are issues in stopping the measurement or collecting data.</div></dt><dd></dd><dt><dl><dt>Type</dt><dd><span class="param-type">Error</span></dd></dl></dt><dd></dd></dl></div><div class="method-member-container mt-20"><strong>Returns:</strong><div class="param-desc">A promise that resolves with the collected metrics data.</div><dl class="param-type"><dt>Type:&nbsp;</dt><dd><span class="param-type">Promise</span></dd></dl></div><h3 class="name has-anchor" id="stopAsError"><span class="type-signature">(async) </span>stopAsError<span class="signature">(errorMessage, optionalURL)</span><span class="type-signature"> &rarr; {Promise}</span></h3><div class="description">Stop the current measurement and mark it as a failure. This stop function will not measure anything on a page. This is useful if you need to stop a measurement in a (try) catch and you know something has failed.</div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>errorMessage</code></td><td class="type"><span class="param-type">string</span></td><td class="description last">The message about the error. This will end up on the HTML report for sitespeed.io so give it a good message so you know what's gone wrong.</td></tr><tr><td class="name"><code>optionalURL</code></td><td class="type"><span class="param-type">string</span></td><td class="description last">The URL of the page that you wanted to test. If you don't know the URL (you clicked on a link etc) skip it.</td></tr></tbody></table></div><dl class="details"><div class="details-item-container"><dt class="tag-since bold">Since</dt><dd class="tag-since"><ul><li>21.2.0</li></ul></dd></div></dl><div class="method-member-container mt-20"><strong>Returns:</strong><div class="param-desc">A promise that resolves when the stop process has completed.</div><dl class="param-type"><dt>Type:&nbsp;</dt><dd><span class="param-type">Promise</span></dd></dl></div></article></section><footer class="footer" id="PeOAagUepe"><div class="wrapper">© <a href="https://www.sitespeed.io">sitespeed.io</a> 2024</div></footer></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use 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