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    How to setup and event on rate of change?

    Dashboard Designer & Custom AngularJS Pages
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    • V
      v8dave
      last edited by

      Just trying this now and when I input the script and then click save, I get this error at the bottom.

      invalid return
      at line -1
      

      I've selected a suitable data point and set its name to p for this test.

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      • phildunlapP
        phildunlap
        last edited by phildunlap

        Are you using the scripts as posted or as they arrived in an email notification?

        I am able to run all of these with a numeric point for p. That looks like a syntax error, which I think I would get regardless of the code path.

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        • V
          v8dave
          last edited by

          Hi Phil, I am using a numerical data point. Here is the screen capture. I modified the script as I only need to detect a falling trend.!!

          0_1469686311138_script.png

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          • phildunlapP
            phildunlap
            last edited by

            it looks like you are using the scripting data source, instead of a meta data source and putting these scripting in a meta data point.

            Scripts are intended for a multiple-output control loop. Scripting data source scripts don't contain return statements, they set a point's value with p.set(value, time) or just p.set(value) for the current time.

            This kind of thing, where we're producing a single answer from perhaps multiple inputs, should be a meta point.

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            • V
              v8dave
              last edited by

              Ah yes, so I was. Just trying it now but there is an error about a null value on line 4 which seems strange because it would not get to this line unless there was data.

              var data = bbl1.pointValuesSince(new Date().getTime() - 5*60*1000); //Five minutes in milliseconds
              if( data.length <= 1 ) //we have the same edge conditions for our range
                 return false;
              var firstValue = data[0];
              var changeThreshhold = -20; //so, this would mean that if any point in the period it is more than
              for( var k = 1; k < data.length; k+=1 ) {
                if( firstValue.value - data[k].value < changeThreshhold)
                  return true;
              }
              return false;
              
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              • phildunlapP
                phildunlap
                last edited by

                That is odd....
                I would put print(data) at line 2 to investigate.

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                • V
                  v8dave
                  last edited by

                  I've added that but where do I see the output from this?

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                  • phildunlapP
                    phildunlap
                    last edited by

                    It would be below the script window, if it ran, where you saw the error. If it didn't, I wonder if you have a global script declared? The global scripts page is this icon: 0_1469746987325_script-globe.png

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                    • V
                      v8dave
                      last edited by

                      I don't have that icon. Is this a module I need to install or a setting somewhere?

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                      • V
                        v8dave
                        last edited by

                        I found the module and installed it and the icon is now present. My scripts still don't seem the be running as there is no output from the print(data) statement.

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                        • phildunlapP
                          phildunlap
                          last edited by phildunlap

                          No, I was curious if that's where the error was occurring, not telling you that you needed to install it.

                          Do you get the same error from a very simple script, perhaps just...

                          return false;
                          

                          Are you sure your point is in the context as bbl1 (b - b - lower case L - numeral 1)?

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                          • V
                            v8dave
                            last edited by

                            I am assuming that the variable is based on the area I circled?
                            0_1469800445894_Untitled.jpg

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                            • phildunlapP
                              phildunlap
                              last edited by

                              Yeah, just checking. That script I posted surely runs for me, here's a version of yours with lots of print statements, maybe it will help find the issue?

                              print("bbl1:");
                              print(bbl1);
                              var data = bbl1.pointValuesSince(new Date().getTime() - 5*60*1000); //Five minutes in milliseconds
                              print("data:");
                              print(data);
                              if( data.length <= 1 ) //we have the same edge conditions for our range
                                 return false;
                              print("Passed the length condition...");
                              var firstValue = data[0];
                              var changeThreshhold = -20; //so, this would mean that if any point in the period it is more than
                              for( var k = 1; k < data.length; k+=1 ) {
                                if( firstValue.value - data[k].value < changeThreshhold)
                                  return true;
                              }
                              return false;
                              

                              If you see no output, I encourage you to 1) check for updates, 2) clear your browsers cache, 3) delete Mango/work/jsp and then try again.

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                              • V
                                v8dave
                                last edited by

                                Hi Phil, it doesn't seem to run. Nothing appears from the debug. I also deleted the jsp directory and still the same.

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                                • phildunlapP
                                  phildunlap
                                  last edited by phildunlap

                                  Are you getting errors in the log, or just on the script's page? Is it still reporting null at line 4? Did you try a very simple script, just

                                  return false;
                                  

                                  And see if it reports success result=false?

                                  Well, would it be possible for you to email me the JSON for your Mango and I'll try to find the problem locally? I'd like your whole configuration.

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                                  • V
                                    v8dave
                                    last edited by

                                    Looking at the log file, it is still failing at this line.

                                    var firstValue = data[0];
                                    
                                    ERROR 2016-07-29 07:39:00,004 (com.serotonin.m2m2.meta.JavaScriptPointLocatorRT.executeImpl:54) - sun.org.mozilla.javascript.EvaluatorException: Java class "java.util.ArrayList" has no public instance field or method named "0". (<Unknown Source>#9) in <Unknown Source> at line number 9 in <Unknown Source> at line number 9
                                    

                                    I export and send you the file.

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                                    • phildunlapP
                                      phildunlap
                                      last edited by

                                      It works fine for me, so, I wonder if it's a Java version issue.

                                      Judging from that error message, I would try using data.get(0) instead of data[0]

                                      Can you run "java -version" on the command line and report the result?

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                                      • V
                                        v8dave
                                        last edited by

                                        It's running on a Centos system and the "java -version" command gives me this error.

                                        Error occurred during initialization of VM
                                        Could not reserve enough space for object heap
                                        Error: Could not create the Java Virtual Machine.
                                        Error: A fatal exception has occurred. Program will exit.
                                        

                                        I have Mango running as a service on this machine. Java is install and running otherwise Mango won't run.

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                                        • V
                                          v8dave
                                          last edited by

                                          With .get(0) I get this error.

                                          ERROR 2016-07-29 08:13:13,576 (com.serotonin.m2m2.meta.JavaScriptPointLocatorRT.executeImpl:54) - sun.org.mozilla.javascript.EcmaError: TypeError: Cannot find function get in object {minimumValue: 99.05402923333332, minimumTime: 1469804893540, maximumValue: 99.568, maximumTime: 1469805193538, average: 99.15065249671122, sum: 397.38296884523055, count: 4, delta: 0.5139707666666737, integral: 29745.195749013365, firstValue: 99.05402923333332, firstTime: 1469805036550, lastValue: 99.568, lastTime: 1469805193538, periodStartTime: 1469804893540, periodEndTime: 1469805193540}. (<Unknown Source>#9) in <Unknown Source> at line number 9 in <Unknown Source> at line number 9 
                                          javax.script.ScriptException: sun.org.mozilla.javascript.EcmaError: TypeError: Cannot find function get in object {minimumValue: 99.05402923333332, minimumTime: 1469804893540, maximumValue: 99.568, maximumTime: 1469805193538, average: 99.15065249671122, sum: 397.38296884523055, count: 4, delta: 0.5139707666666737, integral: 29745.195749013365, firstValue: 99.05402923333332, firstTime: 1469805036550, lastValue: 99.568, lastTime: 1469805193538, periodStartTime: 1469804893540, periodEndTime: 1469805193540}. (<Unknown Source>#9) in <Unknown Source> at line number 9 in <Unknown Source> at line number 9
                                          
                                          
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                                          • terrypackerT
                                            terrypacker
                                            last edited by

                                            Dave,

                                            That last post shows that you are using the statistics method to get the data. I'll just ignore that and focus on the first problems you were having. You are expecting the method:

                                            bbl1.pointValuesSince()
                                            

                                            to return an Array, but it actually returns a Java style ArrayList. The difference is that ArrayLists have a method called size() instead of the member length and accessing the values is done via get(index).

                                            So here is an updated version of your script to run using an array list instead of an array:

                                            var data = bbl1.pointValuesSince(new Date().getTime() - 5*60*1000); //Five minutes in milliseconds
                                            if( data.size() <= 1 ) //we have the same edge conditions for our range
                                               return false;
                                            var firstValue = data.get(0);
                                            var changeThreshhold = -20; //so, this would mean that if any point in the period it is more than
                                            for( var k = 1; k < data.size(); k+=1 ) {
                                              if( firstValue.value - data.get(k).value < changeThreshhold)
                                                return true;
                                            }
                                            return false;
                                            

                                            Hope this helps.

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