{"id":3712,"date":"2019-03-25T17:45:36","date_gmt":"2019-03-25T20:45:36","guid":{"rendered":"http:\/\/xexeu.elipse.com.br\/pt\/kb83657-generating-an-event-in-the-driver-only-when-an-element-is-changed\/"},"modified":"2019-05-29T11:05:15","modified_gmt":"2019-05-29T14:05:15","slug":"kb83657-generating-an-event-in-the-driver-only-when-an-element-is-changed","status":"publish","type":"post","link":"https:\/\/kb.elipse.com.br\/en\/kb83657-generating-an-event-in-the-driver-only-when-an-element-is-changed\/","title":{"rendered":"KB-83657: Generating an event in the driver only when an element is changed."},"content":{"rendered":"<div align=\"justify\"><b>Question:<\/b><\/p>\n<p>A script in a block tag&#8217;s <i>OnRead <\/i>event isn&#8217;t being executed properly: there is only one element whose&nbsp; <i>EnableDriverEvent <\/i>property is set as TRUE, this element is not changed, and yet the event still occurs. Why is it so?<\/p>\n<p><b>Solution:<\/b><\/p>\n<p>This happens because the <i>EnableDriverEvent <\/i>property is the responsible for generating the driver&#8217;s <i>OnTagRead <\/i>event, and not the tag&#8217;s <i>OnRead <\/i>event. Therefore, this property is useless in this case. <\/p>\n<p>If the script had been created in the driver&#8217;s <i>OnTagRead <\/i>event, it would still be fired, because the event is not fired simply by an element&#8217;s change in value. Any change in any other block element causes the whole block&#8217;s timestamp to also change, which in turn causes the element whose <i>EnableDriverEvent <\/i>property is set up to TRUE to trigger the driver&#8217;s <i>OnTagRead <\/i>event.<\/p>\n<p>To cause the script to be executed only when a specific element is changed, the solution is: Create a user-generated event in the block element containing an expression to monitor its value change.<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Question: A script in a block tag&#8217;s OnRead event isn&#8217;t being executed properly: there is only one element whose&nbsp; EnableDriverEvent property is set as TRUE, this element is not changed,&hellip;<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0},"categories":[753],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.8 - 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