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**Category:** RobotStudio\
**Created:** [June 4, 2020, 1:39am UTC](https://tech-community.robotics.abb.com/t/does-robot-web-services-read-the-html-or-javascript-instance-code-for-subscribing-to-numeric-values/9549 "2020-06-04T01:39:26Z")\
**Posts on this page:** 3\
**Page:** 1
**Author:**  [@Sample](https://tech-community.robotics.abb.com/u/Sample)\
**Post date:** [June 4, 2020, 1:39am UTC](https://tech-community.robotics.abb.com/t/does-robot-web-services-read-the-html-or-javascript-instance-code-for-subscribing-to-numeric-values/9549/1 "2020-06-04T01:39:26Z")
I only saw the c# read subscription code in the manual on web server, which is not for mobile. In addition, I get other values through HTML language for many times or cause the phenomenon of teacher trainer to get stuck. I want to know the change of value through subscription and then read it, but I did not find this method
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**Author:**  [@Maxim](https://tech-community.robotics.abb.com/u/Maxim)\
**Post date:** [June 4, 2020, 6:42am UTC](https://tech-community.robotics.abb.com/t/does-robot-web-services-read-the-html-or-javascript-instance-code-for-subscribing-to-numeric-values/9549/2 "2020-06-04T06:42:53Z")
Could you not look how it’s done in C# and just port the code to Javascript/HTML?
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**Author:**  [@Sample](https://tech-community.robotics.abb.com/u/Sample)\
**Post date:** [June 4, 2020, 7:38am UTC](https://tech-community.robotics.abb.com/t/does-robot-web-services-read-the-html-or-javascript-instance-code-for-subscribing-to-numeric-values/9549/3 "2020-06-04T07:38:35Z")
> [@](#):
>
> Could you not look how it’s done in C# and just port the code to Javascript/HTML?
Thank you for your suggestion. I have studied the source file of C# about subscription code very hard yesterday, but my C# code is not good enough, so I had better not find a way to monitor the change of subscription variable.