{"id":11150,"date":"2024-07-18T20:12:45","date_gmt":"2024-07-19T00:12:45","guid":{"rendered":"https:\/\/www.redline13.com\/blog\/?p=11150"},"modified":"2024-07-18T20:12:46","modified_gmt":"2024-07-19T00:12:46","slug":"using-the-jmeter-if-controller","status":"publish","type":"post","link":"https:\/\/www.redline13.com\/blog\/2024\/07\/using-the-jmeter-if-controller\/","title":{"rendered":"Using the JMeter “If” Controller"},"content":{"rendered":"

<\/a> \"Using<\/p>\n

JMeter<\/a> contains a built-in component that can assist in controlling the logical flow of a load test based on internal conditions. Using the If Controller<\/em><\/a>, conditional logic can be set up to either run once for a group of elements, or optionally for each element within a set. Only if the specified condition is \u201ctrue<\/strong>\u201d will items within the If Controller<\/em> be executed.<\/p>\n

\"The
The \u201cIf Controller\u201d is a JMeter built-in component that can assist with logic flow control of your load tests.<\/figcaption><\/figure>\n

Once added to a test plan, the If Controller<\/em> acts as a container for one or more child components. These can be sampler elements such as HTTP Requests, or other logical components. Additionally, it is possible to nest If Controllers<\/em> to create more complicated, branching test logic:<\/p>\n

\"If
\u201cIf Controllers\u201d can be nested to create branching test logic.<\/figcaption><\/figure>\n

<\/a>Evaluating Conditions<\/h3>\n

Subscribing to classic \u201cif-then<\/em>\u201d logic<\/a>, flow control is evaluated as \u201ctrue<\/strong><\/code>\u201d or \u201cfalse<\/code><\/strong>\u201d. This primarily occurs in one of two ways. JMeter variables can hold boolean values and be referenced directly as the condition, using standard ${…}<\/strong> notation<\/a>. The second method afforded by the If Controller<\/em> is evaluating a snippet of JavaScript<\/a> as \u201ctrue<\/strong><\/code>\u201d or \u201cfalse<\/strong><\/code>\u201d.<\/p>\n

For performance reasons, it is strongly recommended that Java Expression Language (JEXL)<\/em><\/a> be used by invoking the jexl3()<\/strong><\/a><\/code> method. This can be accomplished via the JMeter special function, i.e.<\/em>, ${__jexl3()}<\/code><\/strong>. You do have the option to use JavaScript by unchecking the \u201cInterpret Condition as Variable Expression<\/em>\u201d setting. However, while this can be more flexible there is a severe performance penalty as alerted when this setting is unchecked:<\/p>\n

\"Performance
Performance can be severely affected when evaluating expressions as JavaScript.<\/figcaption><\/figure>\n

<\/a>Handling Child Elements<\/h3>\n

There are two behaviors to select from when evaluating child elements. The default behavior is to evaluate the condition of the If Controller<\/em> once for the entire set of children. This will result in an all-or-nothing pattern of execution. Optionally, you may tick the \u201cEvaluate for all children<\/em>\u201d checkbox which will have the effect of running the condition for each<\/em> child element and only executing on those occurrences where the result is \u201ctrue<\/strong><\/code>\u201d.<\/p>\n

\n

Did you know that RedLine13 offers a full-featured, time-limited free trial?\u00a0 Sign up now<\/a>, and start testing today!<\/p>\n","protected":false},"excerpt":{"rendered":"

JMeter contains a built-in component that can assist in controlling the logical flow of a load test based on internal conditions. Using the If Controller, conditional logic can be set up to either run once for a group of elements, or optionally for each element within a set. Only if the specified condition is \u201ctrue\u201d will items within the If Controller be executed. Once added to a test plan, the If Controller acts as a containerRead More →<\/a><\/p>\n","protected":false},"author":11,"featured_media":11151,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,1],"tags":[75,128,283,662,299,318,424],"class_list":{"0":"entry","1":"post","2":"publish","3":"author-dkoziel","4":"post-11150","6":"format-standard","7":"has-post-thumbnail","8":"category-blog","9":"category-uncategorized","10":"post_tag-apache-jmeter","11":"post_tag-cloud-load-testing","12":"post_tag-jmeter","13":"post_tag-jmeter-conditions","14":"post_tag-jmeter-plugins","15":"post_tag-load-testing","16":"post_tag-redline13"},"yoast_head":"\nUsing the JMeter "If" Controller - RedLine13<\/title>\n<meta name=\"description\" content=\"The "If Controller" allows you to specify conditional logic within your JMeter load test to be applied to a group of child elements.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.redline13.com\/blog\/2024\/07\/using-the-jmeter-if-controller\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Using the JMeter "If" Controller - 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