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Cylinder Gauge

The cylinder gauge is represented by a vertical cylinder, whose fill level is defined by the data value you plot. You can use it to report inventory levels, fuel levels, etc. The cylinder gauge is a real-time chart, which can update its data after intervals you specify, without any page refreshes. What makes a cylinder gauge different from other gauges is that this gauge can only be rendered with one fill color. You cannot create a cylinder gauge with color ranges.

{ "header": "Chart Anatomy", "subHeader": "To know how FusionCharts works, it is important to understand the various components and concepts of a chart", "content": { "header": "Below are different sections with interactive annotated images describing various components and concepts of charts", "contentGroup": [ { "itemHeader": "Cylinder Gauge", "imgSrc": "cylinder-gauge-anatomy.png", "annotations": [{ "annotationNumber": "1", "annotationName": "Caption", "annotationDesc": "The caption (also called the gauge title) is the heading of your gauge. You can add custom text for the caption, as well as configure its font properties and cosmetics.", "annotationDescLinkPath": null, "leftPosition": "35.5%", "topPosition": "12.5%", "annotationLinks": [{ "linkDesc": "Learn how to add caption ", "linkPath": "/chart-guide/chart-configurations/caption-and-sub-caption#set-the-caption-and-subcaption" }, { "linkDesc": "You can customize font properties and cosmetics of caption using attributes. Know more about them. ", "linkPath": "/chart-guide/chart-configurations/caption-and-sub-caption#customize-font-properties" }, { "linkDesc": "You can also customize the alignment of the caption. Learn more about it ", "linkPath": "/chart-guide/chart-configurations/caption-and-sub-caption#configure-caption-alignment" } ] }, { "annotationNumber": "2", "annotationName": "Subcaption", "annotationDesc": "The sub-caption (also called the gauge subtitle) is the sub-heading of your gauge. You can add custom text for sub-caption, as well as configure its font properties.", "annotationDescLinkPath": null, "leftPosition": "53%", "topPosition": "19.5%", "annotationLinks": [{ "linkDesc": "Learn how to add sub-caption ", "linkPath": "/chart-guide/chart-configurations/axes#setting-axes-names" }, { "linkDesc": "Font properties and cosmetics of sub-caption can also be customized using attributes, learn more about them ", "linkPath": "/chart-guide/chart-configurations/caption-and-sub-caption#customize-font-properties" } ] }, { "annotationNumber": "3", "annotationName": "Canvas Area", "annotationDesc": "Canvas area refers to the area in which the gauge data is plotted, excluding the area where titles, legends, and axis names are rendered.", "annotationDescLinkPath": null, "leftPosition": "89%", "topPosition": "30%", "annotationLinks": [{ "linkDesc": "You can customize border for canvas, learn more about it ", "linkPath": "/chart-guide/chart-configurations/canvas#show-canvas-border" }, { "linkDesc": "You can customize background color for canvas, as well as add gradient fill to it. Learn more about it ", "linkPath": "/chart-guide/chart-configurations/canvas#use-gradient-fill" } ] }, { "annotationNumber": "4", "annotationName": "Lower Limit", "annotationDesc": "Lower Limit refers to the lowest point in the reference scale used in the gauge. Learn more about it ", "annotationDescLinkPath": "/chart-guide/chart-configurations/axes#setting-axes-names", "leftPosition": "58%", "topPosition": "62%", "annotationLinks": [] }, { "annotationNumber": "5", "annotationName": "Upper Limit", "annotationDesc": "Upper Limit refers to the highest point in the reference scale used in the gauge. Learn more about it ", "annotationDescLinkPath": "/chart-guide/chart-configurations/axes#setting-axes-names", "leftPosition": "56%", "topPosition": "26%", "annotationLinks": [] }, { "annotationNumber": "6", "annotationName": "Gauge Scale", "annotationDesc": "The gauge scale displays all possible values between the lower and upper limits. Learn more about it ", "annotationDescLinkPath": "/chart-guide/chart-configurations/axes#setting-axes-names", "leftPosition": "53.5%", "topPosition": "40%", "annotationLinks": [] }, { "annotationNumber": "7", "annotationName": "Tick Mark", "annotationDesc": "Tick marks are placed at regular intervals on the gauge scale, to indicate data values. Learn more about them ", "annotationDescLinkPath": "/chart-guide/chart-configurations/axes#setting-axes-names", "leftPosition": "47.5%", "topPosition": "40%", "annotationLinks": [] }, { "annotationNumber": "8", "annotationName": "Data Plot", "annotationDesc": "Data plot refers to the columns of the dial in an angular gauge, the sphere in a bulb gauge, the thermometer in a thermometer gauge, and so on.", "annotationDescLinkPath": null, "leftPosition": "42%", "topPosition": "56%", "annotationLinks": [{ "linkDesc": "You can customize the way your data plot looks using colors, gradients and hover effects using available attributes. Learn more about their usage ", "linkPath": "/chart-guide/chart-configurations/data-plot" }] }, { "annotationNumber": "9", "annotationName": "Data Value", "annotationDesc": "Data value refers to the number displayed in a text box placed right below the angular gauge, which shows the data value of the location where the pointer is being hovered at the moment.", "annotationDescLinkPath": null, "leftPosition": "49%", "topPosition": "72%", "annotationLinks": [{ "linkDesc": "You can customize the way your data value looks using colors, font, and font properties, using available attributes. Learn more about their usage ", "linkPath": "/chart-guide/chart-configurations/data-value" }] }, { "annotationNumber": "10", "annotationName": "Tooltip", "annotationDesc": "A tooltip is displayed when the mouse cursor hovers over a particular data point. It denotes valuable information about the data plot hovered.", "annotationDescLinkPath": "/chart-guide/chart-configurations/axes#setting-axes-names", "leftPosition": "56.5%", "topPosition": "49%", "annotationLinks": [{ "linkDesc": "You can customize padding, size and other properties of tooltip, learn more about it ", "linkPath": "/chart-guide/chart-configurations/tool-tips#customize-tooltips" }, { "linkDesc": "You can also customize the text of tooltip and use values plotted on the gauge using macros, learn more about it ", "linkPath": "/chart-guide/chart-configurations/tool-tips#introduction-to-macros" } ] } ] } ] } }

Simple Cylinder Gauge Example

You can use the cylinder gauge shown below, to monitor the diesel level in the generator at Bakersfield Central.

FusionCharts will load here..
{
    "chart": {
        "theme": "fusion",
        "caption": "Diesel Level in Generator",
        "subcaption": "Bakersfield Central",
        "lowerLimit": "0",
        "upperLimit": "120",
        "lowerLimitDisplay": "Empty",
        "upperLimitDisplay": "Full",
        "numberSuffix": " ltrs",
        "showValue": "0",
        "chartBottomMargin": "45"
    },
    "value": "110",
    "annotations": {
        "origw": "400",
        "origh": "190",
        "autoscale": "1",
        "groups": [
            {
                "id": "range",
                "items": [
                    {
                        "id": "rangeBg",
                        "type": "rectangle",
                        "x": "$canvasCenterX-45",
                        "y": "$chartEndY-30",
                        "tox": "$canvasCenterX +45",
                        "toy": "$chartEndY-75",
                        "fillcolor": "#6caa03"
                    },
                    {
                        "id": "rangeText",
                        "type": "Text",
                        "fontSize": "11",
                        "fillcolor": "#333333",
                        "text": "80 ltrs",
                        "x": "$chartCenterX-45",
                        "y": "$chartEndY-50"
                    }
                ]
            }
        ]
    }
}
<chart theme="fusion" caption="Diesel Level in Generator" subcaption="Bakersfield Central" lowerlimit="0" upperlimit="120" lowerlimitdisplay="Empty" upperlimitdisplay="Full" numbersuffix=" ltrs" showvalue="0" chartbottommargin="45">
    <value>110</value>
    <annotations origw="400" origh="190" autoscale="1">
        <annotationgroup id="range">
            <annotation id="rangeBg" type="rectangle" x="$canvasCenterX-45" y="$chartEndY-30" tox="$canvasCenterX +45" toy="$chartEndY-75" fillcolor="#6caa03" />
            <annotation id="rangeText" type="Text" fontsize="11" fillcolor="#333333" text="80 ltrs" x="$chartCenterX-45" y="$chartEndY-50" />
        </annotationgroup>
    </annotations>
</chart>
<html>
<head>
	<title>My first chart using FusionCharts Suite XT</title>
	<script type="text/javascript" src="https://cdn.fusioncharts.com/fusioncharts/latest/fusioncharts.js"></script>
	<script type="text/javascript" src="https://cdn.fusioncharts.com/fusioncharts/latest/themes/fusioncharts.theme.fusion.js"></script>
	<script type="text/javascript">
		FusionCharts.ready(function(){
			var chartObj = new FusionCharts({
    type: 'cylinder',
    dataFormat: 'json',
    renderAt: 'chart-container',
    width: '200',
    height: '350',
    dataSource: {
        "chart": {
            "theme": "fusion",
            "caption": "Diesel Level in Generator",
            "subcaption": "Bakersfield Central",
            "lowerLimit": "0",
            "upperLimit": "120",
            "lowerLimitDisplay": "Empty",
            "upperLimitDisplay": "Full",
            "numberSuffix": " ltrs",
            "showValue": "1",
            "chartBottomMargin": "45",
            "showValue": "0"
        },
        "value": "110",
        "annotations": {
            "origw": "400",
            "origh": "190",
            "autoscale": "1",
            "groups": [{
                "id": "range",
                "items": [{
                    "id": "rangeBg",
                    "type": "rectangle",
                    "x": "$canvasCenterX-45",
                    "y": "$chartEndY-30",
                    "tox": "$canvasCenterX +45",
                    "toy": "$chartEndY-75",
                    "fillcolor": "#6caa03"
                }, {
                    "id": "rangeText",
                    "type": "Text",
                    "fontSize": "11",
                    "fillcolor": "#333333",
                    "text": "80 ltrs",
                    "x": "$chartCenterX-45",
                    "y": "$chartEndY-50"
                }]
            }]
        }

    },
    "events": {
        "rendered": function(evtObj, argObj) {
            var fuelVolume = 110;
            evtObj.sender.chartInterval = setInterval(function() {
                (fuelVolume < 10) ? (fuelVolume = 80) : "";
                var consVolume = fuelVolume - (Math.floor(Math.random() * 3));
                evtObj.sender.feedData && evtObj.sender.feedData("&value=" + consVolume);
                fuelVolume = consVolume;
            }, 1000);
        },
        //Using real time update event to update the annotation
        //showing available volume of Diesel
        "realTimeUpdateComplete": function(evt, arg) {
            var annotations = evt.sender.annotations,
                dataVal = evt.sender.getData(),
                colorVal = (dataVal >= 70) ? "#6caa03" : ((dataVal <= 35) ? "#e44b02" : "#f8bd1b");
            //Updating value
            annotations && annotations.update('rangeText', {
                "text": dataVal + " ltrs"
            });
            //Changing background color as per value
            annotations && annotations.update('rangeBg', {
                "fillcolor": colorVal
            });

        },
        "disposed": function(evt, arg) {
            clearInterval(evt.sender.chartInterval);
        }
    }
}
);
			chartObj.render();
		});
	</script>
	</head>
	<body>
		<div id="chart-container">FusionCharts XT will load here!</div>
	</body>
</html>

Click here to edit the above gauge.

Elements of Cylinder Gauges

In the image below, you can see the basic elements of a cylinder gauge:

Cylinder-gauge

Cylinder Fill

The cylinder is the main component in a cylinder chart. You can understand the value being illustrated by looking at the percentage of cylinder filled.

Tick Marks

Tick marks are the calibration marks on the vertical scale to the left/right of the cylinder, which help you interpret the reading. There are two types of tick marks which you can draw on the chart:

  • Major tick marks – These are the bigger lines on the tick mark scale.

  • Minor tick marks – These are the smaller lines enclosed within the bigger lines.

Chart Value

The value display box helps you display the current value of the cylinder fill.

Annotations

Annotations are graphical elements that you can create and position anywhere on a gauge. You can configure these elements in a number of ways, to customize your chart. Although annotations are non-chart elements, you can render them on the chart, to improve the visual representation of data.

With this, you have seen what is a cylinder gauge and the the basic components that make up a cylinder gauge.

Simple Cylinder Gauge Example

The cylinder gauge is a real-time chart, which can update its data after specified intervals, without requiring any page refreshes. In this section, you will be shown how you can create a simple cylinder gauge.

Create a Cylinder Gauge

Use the following attributes to create a simple cylinder gauge:

  • Specify the type using the type attribute. To render Cylinder gauge, set cylinder.

  • Set the container object using renderAt attribute.

  • Specify the dimension of the chart using width and height attributes.

  • Set the type of data (JSON/XML) you want to pass to the chart object using dataFormat attribute.

  • Use the lowerLimit attribute to specify the lower limit, or the minimum value, of the gauge scale.

  • Use the upperLimit attribute to specify the upper limit, or the maximum value, of the gauge scale.

  • Use the lowerLimitDisplay attribute to specify the label to be displayed with the lower limit value on the gauge scale.

  • Use the upperLimitDisplay attribute to specify the label to be displayed with the upper limit value on the gauge scale.

  • Use the numberSuffix attribute to specify the character(s) to be appended to the end of a number.

Refer to the code below:

{
    "chart": { 
        "lowerLimit": "0",
        "upperLimit": "120",
        "lowerLimitDisplay": "Empty",
        "upperLimitDisplay": "Full",
        "numberSuffix": " ltrs"
    },
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

The cylinder gauge shown above has a maximum capacity of 120 liters, and is configured to show that 75 liters of diesel is left in the generator.

You have several options to configure and customize the cylinder gauge to suit your requirements.

Set Cylinder Fill Color

Use the cylFillColor attribute to specify the hex code of the fill color for the cylinder.

Refer to the code below:

{
    "chart": {    
        "cylFillColor": "#1aaf5d"
    },
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

If you do not customize the fill color, the cylinder gauge will use the default color as the fill color instead.

Customize Cylinder Origin, Radius, and Height

Use the following attributes to customize the cylinder origin, radius, and height:

  • Use the cylOriginX attribute to specify the origin x-coordinate of the cylinder.

  • Use the cylOriginY attribute to specify the origin y-coordinate of the cylinder.

  • Use the cylRadius attribute to specify the radius of the cylinder.

  • Use the cylHeight attribute to specify the height of the cylinder.

Refer to the code below:

{
    "chart": { 
        "cyloriginx": "50",
        "cyloriginy": "260",
        "cylradius": "40",
        "cylheight": "150"
    },
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

If you don't customize the origin, radius, and height, the cylinder gauge will automatically calculate the best-fit coordinates and size for the cylinder.

Configure Chart Value Display

Set the value of the showValue attribute to 0 to hide the data values below the gauge.

Refer to the code below:

{
    "chart": { 
        "showValue": "0"
    },
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

By default, the attribute takes 1 as the value, and displays data values below the gauge.

Hide Tick Marks and Tick Values

Use the following attributes to hide tick marks and values:

  • Set the value of the showTickMarks attribute to 0, to hide the tick marks.

  • Set the value of the showTickValues attribute to 0, to hide the tick values.

Refer to the code below:

{
    "chart": { 
        "showTickMarks": "0",
        "showTickValues": "0"
    },
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

Position Tick Marks and Tick Values

Set the value of the ticksOnRight attribute to 0, to render the tick marks on the left side of the gauge.

Refer to the code below:

{
    "chart": { 
        "ticksOnRight": "0"
    },
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

By default, the tick marks and tick values are rendered to the right of the gauge.

Customize the Number of Tick Marks

Use the following attributes to customize the number of tick marks:

  • Use the majorTMNumber attribute to specify the number of major tick marks.

  • Use the minorTMNumber attribute to specify the number of minor tick marks. Note that minor tick marks refer to the tick marks between two major tick marks.

Refer to the code below:

{
    "chart": { 
        "majorTMNumber": "9",
        "minorTMNumber": "1"
    },
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

Disable Auto Adjustment of Tick Marks

Set the value of the adjustTMattribute to 0, to disable automatic distribution of tick marks by the gauge, to ensure the best view.

Refer to the code below:

{
    "chart": { 
        "adjustTM": "0"
    },
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

Unless you manually disable the automatic distribution of tick marks, the cylinder gauge can automatically calculate and display the best feasible number of major tick marks.

Configure Tick Value Step

Set the value of the tickValueStep attribute to n, to only display every nth tick value on the gauge.

Refer to the code below:

{
    "chart": { 
        "tickValueStep": "2"
    },
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

The cylinder gauge always displays the upper and lower limits of the scale.

Configure Tick Mark Cosmetics

Use the following attributes to configure the major and minor tick marks:

  • Use the majorTMColor attribute to specify the hex code of the color to be used to render the major tick marks.

  • Use the majorTMAalpha attribute to specify the transparency (between 0 for transparent and 100 for opaque) of the major tick marks.

  • Use the majorTMHeight attribute to specify the height (in pixels) of the major tick marks.

  • Use the majorTMThickness attribute to specify the thickness (in pixels) of the major tick marks.

  • Use the minorTMColor attribute to specify the hex code of the color to be used to render the minor tick marks.

  • Use the minorTMAlpha attribute to specify the transparency (between 0 for transparent and 100 for opaque) of the minor tick marks.

  • Use the minorTMHeight attribute to specify the height (in pixels) of the minor tick marks.

  • Use the minorTMThickness attribute to specify the thickness (in pixels) of the minor tick marks.

  • Use the tickMarkDistance attribute to specify the distance (in pixels) between the gauge and the tick marks.

Refer to the code below:

{
    "chart": { 
        "majorTMColor": "#1aaf5d",
        "majorTMAlpha": "100",
        "majorTMHeight": "10",
        "majorTMThickness": "2",
        "minorTMColor": "#1aaf5d",
        "minorTMAlpha": "100",
        "minorTMHeight": "7",
        "minorTMThickness": "1",
        "tickmarkDistance": "5"
    },
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

Apply Hover Effects

Use the following attributes to configure hover/touch effects for the cylinder gauge and boost visualization:

  • Use the cylFillHoverColor attribute to specify the hex code for the color to be used to fill the cylinder when you hover the mouse pointer over it.

  • Use the cylFillHoverAlpha attribute to specify the transparency (between 0 for transparent and 100 for opaque) of the cylinder when you hover the mouse pointer over it.

Refer to the code below:

{
    "chart": { 
        "cylFillHoverColor": "#0099fd",
        "cylFillHoverAlpha": "85"
    },
}

The gauge will look like as shown below:

Cylinder

Click here to edit the above gauge.

Build a Realtime Cylinder Gauge

You can build real-time cylinder gauges that continuously request and render new data without involving a page refresh, by using JavaScript API, or server-side scripts.

Realtime Data Format

When you invoke the data provider page on the server end, it outputs the new data in the real time data format. The real time data format depends on:

  • The value you want to pass.

  • Whether you are using message logger for the gauge.

  • The use of commands for the gauge, such as stop update.

Use the following JavaScript API methods used to update a pointer:

  • Use the feedData(strData) method to feed real time data to the gauge using JavaScript. The data has to be in the same format as provided by the real time data provider page.

  • Use the getData() method to return the data currently being shown by the gauge.

  • Use the setData(value) method to set the data for the gauge. The value should be within the limits of the gauge.

Refer to the code below:

{
    "chart": {
        ...
    },
    "value": "110"
},
"events": {
    "rendered": function(evtObj, argObj) {
        var fuelVolume = 110,
            gaugeRef = evtObj.sender;
        gaugeRef.chartInterval = setInterval(function() {

            (fuelVolume < 10) ? (fuelVolume = 110) : "";
            var consVolume = fuelVolume - (Math.floor(Math.random() * 3));
            gaugeRef.feedData("&value=" + consVolume);
            fuelVolume = consVolume;
        }, 3000);
    },
    "disposed": function(evt, arg) {
        clearInterval(evt.sender.chartInterval);
    }
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

Configure Realtime Updates Using Server-side Script

Use the following parameters to configure real time updates using server-side scripts:

  • Use the dataStreamURL parameter to set the path of the page, which is supposed to relay real time data to the chart. If you have special characters as a part of the data stream URL, such as ? or &, you need to URL Encode the entire dataStreamURL. Note that the target page needs to be on the same sub-domain on which the chart is hosted and invoked from. Otherwise, security will restrict it from accessing the data and hence the real time feature won't work.

  • Use the refreshInterval parameter to specify the number of seconds after which The gauge will look for new data. This process will happen continuously.

  • Use the dataStamp parameter to add a constantly changing data stamp that can be added to the real time data URL, so as to maintain a state. For more information, read .

Refer to the code below:

{
    "chart": {
        "dataStreamUrl": "https://static.fusioncharts.com/sample/dev2.0/gauge-and-widgets-guide-cylinder-gauge-real-time-gauges-php-1.php",
        "refreshInterval": "2",
        "refreshInstantly": "1"
    },
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

Stop/Restart Updates

Use the following JavaScript API methods to stop and restart real time updates to an cylinder gauge:

  • Use the stopUpdate() method to stop the chart from self-updating.

  • Use the restartUpdate() method to resume real time updates to the chart, if you stopped it earlier.

Refer to the code below:

{
    "chart": {
        ...
    },
    "value": "110"
},
events: {
    "beforeRender": function(evt, args) {
        // creating div for controllers
        var controllers = document.createElement('div'),
            isStopped = false,
            gaugeRef = evt.sender;
        controllers.setAttribute('id', 'controllers');

        // Create checkbox inside div
        controllers.innerHTML = '<input type="button" value="Stop Update" id="toggleBtn" style="margin-left:5px;margin-top:5px;font-size:13px;padding:2px;" />';
        args.container.parentNode.insertBefore(controllers, args.container.nextSibling);

        // setting css styles for controllers div
        controllers.style.cssText = "text-align: center;";
        var btn = document.getElementById('toggleBtn'),
            startStopUpdate = function() {
                if (!isStopped) {
                    isStopped = true
                    btn.value = "Restart Update";
                    gaugeRef.stopUpdate();
                } else {
                    isStopped = false;
                    btn.value = "Stop Update";
                    gaugeRef.restartUpdate();
                }
            }

        btn.addEventListener && btn.addEventListener("click", startStopUpdate);

    }
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

Configure Realtime Events

FusionCharts Suite XT introduces two events, realTimeUpdateComplete and realTimeUpdateError, to track real time updates on gauges.

Use the realTimeUpdateComplete Event

The realTimeUpdateComplete event is raised whenever the real time cylinder gauge updates itself with new data, or more specifically, in the following cases:

  • Real time update using datastreamURL

  • Real time update using JavaScript API (using setData, feedData, and setDataForId functions)

  • Real time update of the gauge through user interaction (through edit mode)

The event arguments provided in the advanced model are as follows:

  • The eventObject argument contains the eventId, eventType, and sender properties.

  • The argumentsObject argument contains the values of the updated data and the previous data.

Refer to the code below:

{
    "chart": {
        ...
    },
    "value": "110"
},
"events": {
    "rendered": function(evtObj, argObj) {
        var gaugeRef = evtObj.sender,
            fuelVolume = 110;
        gaugeRef.chartInterval = setInterval(function() {
            (fuelVolume < 10) ? (fuelVolume = 110) : "";
            var consVolume = fuelVolume - (Math.floor(Math.random() * 3));
            gaugeRef.feedData("&value=" + consVolume);
            fuelVolume = consVolume;
        }, 1000);
    },
    //Using real time update event to update the annotation
    //showing available volume of Diesel
    "realTimeUpdateComplete": function(evt, arg) {
        var annotations = evt.sender.annotations,
            dataVal = evt.sender.getData(),
            colorVal = (dataVal >= 70) ? "#6caa03" : ((dataVal <= 25) ? "#e44b02" : "#f8bd1b");
        //Updating value
        annotations && annotations.update('rangeText', {
            "text": "Available Volume: " + dataVal + " ltrs"
        });
        //Changing background color as per value
        annotations && annotations.update('rangeBg', {
            "fillcolor": colorVal
        });
    },
    "disposed": function(evt, arg) {
        clearInterval(evt.sender.chartInterval);
    }
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

Use the realTimeUpdateError Event

The realTimeUpdateError event is raised when an error occurs while performing real time update using datastreamURL. The event arguments provided in the advanced model are as follows:

  • The eventObject argument contains eventId, eventType and sender properties.

  • The argumentsObject argument contains the httpStatus property, which in turn contains the HTTP Error status value as number.

Refer to the code below:

{
    "chart": {
        ...
    },
    "value": "110"
},
"events": {
    'beforeRender': function(evt, args) {

        // creating div for controllers
        var controllers = document.createElement('div'),
            container = document.getElementById('chart-container');
        // Create checkbox inside div

        controllers.innerHTML = '<div id="chart-message"></div>';

        controllers.setAttribute('id', 'controllers');
        // setting css styles for controllers div
        controllers.style.cssText = "text-align: center;min-height: 50px;color : #cc0000;font-family : Arial, Helvetica, sans-serif;font-size : 14px;margin-top : 10px;";
        args.container.parentNode.insertBefore(controllers, args.container.nextSibling);
    },

    //Using real time update error event
    "realtimeUpdateError": function(evtObj, argObj) {
        var msgDiv = document.getElementById('chart-message');
        msgDiv.innerHTML = "<b>Error Occured !</b><br> Status Code : " + argObj.httpStatus;
    }
}

The gauge will look like as shown below:

FusionCharts will load here..

Click here to edit the above gauge.

Troubleshoot Realtime Gauges

While accessing any of the JavaScript methods listed above, if you get an error like "... is not a function of ...", make sure that you are NOT running the chart from the local file system (C:\ , D:). Instead, run the chart from behind a server (localhost - IIS, Apache, etc.). This is because the default security settings do not allow the chart to perform JavaScript interaction on the local file system, unless otherwise specifically set.