How do I plot a graph on the confirmation message, on a webform and Drupal 8?
I searched a lot, but did not find anything useful, but these results.
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There are several modules involved in graphing, including the Charts module.
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There is a programming solution (Display webform results data in a Google Chart), but I don’t think it works, since the site will contain dozens of questionnaires. Drawing charts should be easy, something similar to Twing or only in the confirmation message textBox area.
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images files can be displayed if uploaded to the site via the questionnaire in this way (from How to Display Image after submitting webform in the confirmation message page).
<img src="[submission:values:image_key]"/>
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There are previous attempts at Drupal 7, such as the Webform Charts module. I don’t know how it worked.