OnChange event in Servo controlled WebServer

Q&A Forum › OnChange event in Servo controlled WebServer

David Huisman asked 5 years ago

I am working through the web server sample for controlling a servo. In my application I simply want to update a single parameter value on my host from the ESP32 using a mobile phone.

One aspect I did not understand is how the onChange function in the slider works. The GET function below this code seems to get the slider position so I am not sure what the onChange function needs to do.

Thanks

3 Answers

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Sara Santos Staff answered 5 years ago

Hi David.
The onchange parameter calls the servo() javascript function every time the slider moves, with the value of the slider as an argument:

onchange="servo(this.value)"

Then, the servo() function will make the GET request with the value of the slider:

   function servo(pos) {
      $.get("/?value=" + pos + "&");
      {Connection: close};
    }

In summary, the onchange function will call the servo() function that makes a request with the current slider value.

I hope this is clear.

Let me know if you need further help.
Regards,
Sara

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David Huisman answered 5 years ago

Thank you. I looked through the code again last night and saw the servo routine in the ajax snippet.

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Sara Santos Staff answered 5 years ago

Great!
I’ll close this question.
If you need help on another subject, you just need to open a new question in our forum.
Regards,
Sara