Custom Functions in Expressions

Custom functions enable you to perform any calculations in JavaScript code and use calculation results in expressions within survey JSON schemas. This demo shows how to implement, register, and use a custom function in your survey or form. In this example, a custom function counts matrix rows with a specific value. If all three rows are answered "Agree" or "Strongly agree", the survey displays a form field for positive feedback; if all three rows receive a "Disagree" or "Strongly disagree" value, a form field for negative feedback is displayed. Read more...

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