B4J Question How to updating chart via B4J?

rbghongade

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Dear friends,
I am trying to create an application using B4J and Raspberry Pi 2 (a non-ui app). Raspberry Pi hosts the webpage (html). I want to update a line graph at timed intervals, but have no clue as to how to pass the value from B4J to html using jQuery. I am using RGraph as template for drawing line graph.
I am a complete novice as far as html and jQuery are concerned.
I was able to switch on/off an LED with a button on html page (client side) and also display a random value as text on the webpage.
Please let me know.
Regards,
 
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rbghongade

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Dear billzhan,
Thank you for the reply. I tried the websocket method but am not able to get anywhere. How do I pass the parameters? I do not now how to write java script . Ihave attached my test project. If you can spare some time please let me know as to where I am going wrong.
 

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  • test.zip
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rbghongade

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Dear billzhan,
With your help I am now able to add one more object to html page ! Thanks once again. My new problem is that the data acquisition( here emulated by a timer) is triggered ONLY when websocket is connected, whereas I want it to continue irrespective of any client connection. However it should display the same whenever client is connected. Is there a way to achieve the same? I have attached my project for your perusal.
Thanks in advance!
 

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  • WEBSERVER.zip
    76.7 KB · Views: 192
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billzhan

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Data is stored and retrieved in the main thread.
New client javascript is used to update the data for line graph.

Find the details in attached demo
 

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  • WEB_SERVER v2.zip
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