values wrapping on line chart

[shawnParticipant]

I have a chart with several hundred values to be mapped.
I’m not sure what I’m doing wrong, but the values seem to be wrapping.

the data is from JSON which looks like

[

	{
		"capacityDL": 351,
		"capacityUL": 115,
		"currentDL": 46,
		"currentUL": 119,
		"signal": -65,
		"dateTime": "02/07/2020 00:05:15"
	},
	{
		"capacityDL": 351,
		"capacityUL": 115,
		"currentDL": 64,
		"currentUL": 15,
		"signal": -65,
		"dateTime": "02/07/2020 00:10:15"
	},...

the chart code is

 // prepare jqxChart settings
  var settings = {
      title: gTitle,
      description: "",                
      enableAnimations: true,
      showLegend: true,
      padding: { left: 10, top: 5, right: 10, bottom: 5 },
      titlePadding: { left: 10, top: 0, right: 0, bottom: 10 },
      source: pJson,
      xAxis:
      {
          dataField: 'dateTime',
          type: 'date',
          baseUnit: 'minute',
          valuesOnTicks: true,
          unitInterval: 50
      },
      valueAxis:
      {
          unitInterval: 100,
          minValue: 0,
          maxValue: 1000,
          title: {text: '<br>'},
					formatFunction: function (value) {
					        return Math.round(value);
					}                    
      },
      colorScheme: 'scheme03',
      seriesGroups:
          [
              {
                  type: 'line',
                  series: [
                          { dataField: 'capacityDL', displayText: 'capacity download' },                                    
                          { dataField: 'currentDL', displayText: 'current download' }
                      ]
              }
          ]
  };
  // setup the chart
  $('#chartContainer').jqxChart(settings);

[shawnParticipant]

a like to actual data is HERE

[HristoParticipant]

Hello shawn,

I would like to suggest you try to use it on that way:

var source =
            {
                datatype: "json",
                datafields: [
                    { name: "capacityDL" },
                    { name: "capacityUL" },
                    { name: "currentDL" },
                    { name: "currentUL" },
                    { name: "signal" },
                    { name: "dateTime", type: "date", format: "MM/dd/yyyy HH:mm:ss" }
                ],
                //url: "http://nbson.com/test/jsonTest.json"
                //localdata: pJson
                url: "./jsonTest.json",
                root: 0
            };

            var dataAdapter = new $.jqx.dataAdapter(source, { async: false, autoBind: true, loadError: function (xhr, status, error) { alert("Error loading '" + source.url + "' : " + error); } });

            var settings = {
                title: "gTitle",
                description: "",
                enableAnimations: true,
                showLegend: true,
                padding: { left: 10, top: 5, right: 10, bottom: 5 },
                titlePadding: { left: 10, top: 0, right: 0, bottom: 10 },
                source: dataAdapter,
                xAxis:
                {
                    dataField: "dateTime",
                    type: "date",
                    baseUnit: "minute",
                    valuesOnTicks: true,
                    unitInterval: 50
                },
                valueAxis:
                {
                    unitInterval: 100,
                    minValue: 0,
                    maxValue: 1000,
                    title: { text: "<br>" },
                    formatFunction: function (value) {
                        return Math.round(value);
                    }
                },
                colorScheme: "scheme03",
                seriesGroups:
                    [
                        {
                            type: "line",
                            series: [
                                { dataField: "capacityDL", displayText: "capacity download" },
                                { dataField: "currentDL", displayText: "current download" }
                            ]
                        }
                    ]
            };

            // setup the chart
            $("#chartContainer").jqxChart(settings);

Best Regards,
Hristo Hristov

jQWidgets team
https://www.jqwidgets.com

[shawnParticipant]

that works, thank you

[shawnParticipant]

Hello:
I guess I spoke too soon.
The problem seems to be intermittent.

I have sample data here

// the chart may be redrawn so remove and add the component each time
// note: the line "wrap" can happen even on the first draw
$('#chartContainer').remove();

$.ajax({    
	url: "../cgi-bin/myProg.exe",    
	dataType: "json",		
	data: dataString,
	error: ajaxError, 		 	
	success: function(json){   	 	
			if(json.error !== "0"){
				spinner(0);
				alertify.alert("ERROR "+json.error);
				return;
			}		 				
			
			  console.log("%crData length: "+json.rData.length,"color:orange;");

				var gTitle=$("#radioNameDIV").html();
				
				// add the chart container
				var dv='<div id="chartContainer"></div>';
				$("body").append(dv);

        // prepare the data
				var source =
        {
            datatype: "json",
            datafields: [
						{ name: "autoID" },
						{ name: "rid" },
						{ name: "capacityDL" },
						{ name: "capacityUL" },
						{ name: "currentDL" },
						{ name: "currentUL" },
						{ name: "signal" },
						{ name: "dateTime", type: "date", format: "MM/dd/yyyy HH:mm:ss" },
						{ name: "benchDL" },
						{ name: "benchUL" },
						{ name: "benchSignal" }
            ],
            localdata: json,
            root: 0
        };
        
       var dataAdapter = new $.jqx.dataAdapter(source, { async: false, autoBind: true, loadError: function (xhr, status, error) { alertify.alert("Error loading '" + source.url + "' : " + error); } });
       
       var len=dataAdapter.records.length;
       var interval=len/100;
       var rval=parseInt( $("#resolution").val() );           
       if(interval < 1){interval=1;}           
       interval=(interval*100)/2;

       // prepare jqxChart settings
        var settings = {
            title: gTitle,
            description: "",                
            enableAnimations: true,
            showLegend: true,
            padding: { left: 10, top: 5, right: 10, bottom: 5 },
            titlePadding: { left: 10, top: 0, right: 0, bottom: 10 },
            source: dataAdapter,
            xAxis:
            {
                dataField: 'dateTime',
                type: 'date',
                baseUnit: 'minute',
                valuesOnTicks: true,
                unitInterval: interval 
            },
            valueAxis:
            {
                unitInterval: 100,
                minValue: 0,
                maxValue: 1000,
                title: {text: '<br>'},
								formatFunction: function (value) {
								        return Math.round(value);
								}                    
            },
            colorScheme: 'scheme03',
            seriesGroups:
                [
                    {
                        type: 'line',
                        series: [
                                { dataField: 'capacityDL', displayText: 'capacity download' },                                    
                                { dataField: 'currentDL', displayText: 'current download' }
                            ]
                    }
                ]
        };

            // function to wait for chart to exist before populating 
            waitForElement("#chartContainer",function(){		            
              // setup the chart
              // sometimes
              try{
                 	$('#chartContainer').jqxChart(settings);
              }catch{
                	alertify.alert("error: please narrow your search");
              }	
        });    

	
}
});	

Sometimes I will get the error

jqxchart.core.js:8 Uncaught TypeError: Cannot read property 'offset' of undefined
    at c.<computed>._generateDTOffsets (jqxchart.core.js:8)
    at c.<computed>._renderXAxis (jqxchart.core.js:8)
    at c.<computed>._render (jqxchart.core.js:8)
    at c.<computed>._internalRefresh (jqxchart.core.js:8)
    at c.<computed>.refresh (jqxchart.core.js:8)
    at Object.b.jqx.applyWidget (jqxcore.js:15)
    at HTMLDivElement.<anonymous> (jqxcore.js:15)
    at Function.each (jquery.1.11.1.js:2)
    at m.fn.init.each (jquery.1.11.1.js:2)
    at m.fn.init.b.fn.<computed> [as jqxChart] (jqxcore.js:15)

I have verified that the JSON is always correct.

Thanks

[shawnParticipant]

SORRY:
I found the problem.
The JSON data was not sorted by date.
thanks for your help

[HristoParticipant]

Hello shawn,

Thank you for the clarification.
Please let me know if you have any other questions.

Best Regards,
Hristo Hristov

jQWidgets team
https://www.jqwidgets.com

[Author]

Posts