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Add Y values as labels on a line chart, for some data points

I have a line chart, quite basic (see below for a simplified example that works on the Vega Editor). Basically, it draws lines, the X axis is successive dates, the Y axis is some numerical values.
I am trying to add labels for some of the data points on the line, with the value of Y at that point. Only for some of the data points, because some charts can be for over a year, so there can be hundreds of days (X values).
This is by the way how labels are put on the X axis automatically by Vega. If there are too many X values, it does not display every day, it says e.g. "Jan 1", then "Jan 8", then "Jan 15", etc. (nice one!)
Just for reference, with C3 (a charting library for D3), I used the following to draw one label out of every 7 data point:
data: {
json: data.data,
type: 'spline',
labels: {
format: function(v, id, i, j) {
if ( i % 7 === 3 ) {
return d3.format('.2f')(v);
}
}
...
Unfortunately, I have no idea where to start. I did not find any such example, and could not find anything related in the documentation.
Just for reference, here is an example chart to which I'd like to add these labels:
{
"$schema": "https://vega.github.io/schema/vega/v3.json",
"width": 500,
"height": 250,
"autosize": {
"type": "fit",
"resize": true
},
"data": [{
"name": "table",
"format": {
"parse": {
"date": "date",
"value": "number"
}
},
"values": [
{ "date": "2017-09-01", "value": "12.34", "what": "one" },
{ "date": "2017-09-01", "value": "4.34", "what": "two" },
{ "date": "2017-09-02", "value": "13.34", "what": "one" },
{ "date": "2017-09-02", "value": "13.34", "what": "two" },
{ "date": "2017-09-03", "value": "4.34", "what": "one" },
{ "date": "2017-09-03", "value": "15.34", "what": "two" },
{ "date": "2017-09-04", "value": "15.34", "what": "one" },
{ "date": "2017-09-04", "value": "5.34", "what": "two" },
{ "date": "2017-09-05", "value": "16.34", "what": "one" },
{ "date": "2017-09-05", "value": "6.34", "what": "two" },
{ "date": "2017-09-06", "value": "17.34", "what": "one" },
{ "date": "2017-09-06", "value": "17.34", "what": "two" },
{ "date": "2017-09-07", "value": "18.34", "what": "one" },
{ "date": "2017-09-07", "value": "8.34", "what": "two" },
{ "date": "2017-09-08", "value": "18.34", "what": "one" },
{ "date": "2017-09-08", "value": "14.34", "what": "two" },
{ "date": "2017-09-09", "value": "9.34", "what": "one" },
{ "date": "2017-09-09", "value": "14.34", "what": "two" },
{ "date": "2017-09-10", "value": "20.34", "what": "one" },
{ "date": "2017-09-10", "value": "4.34", "what": "two" }
]
}],
"scales": [{
"name": "x",
"type": "utc",
"range": "width",
"domain": {"data": "table", "field": "date"}
}, {
"name": "y",
"type": "linear",
"range": "height",
"nice": true,
"zero": true,
"domain": {"data": "table", "field": "value"}
}, {
"name": "color",
"type": "ordinal",
"range": "category",
"domain": {"data": "table", "field": "what"}
}],
"axes": [{
"orient": "bottom",
"scale": "x",
"encode": {
"labels": {
"interactive": true,
"update": {
"fill": {"value": "steelblue"},
"angle": {"value": 50},
"fontSize": {"value": 14},
"align": {"value": "left"},
"baseline": {"value": "middle"},
"dx": {"value": 3}
},
"hover": {
"fill": {"value": "firebrick"}
}}}
}, {
"orient": "left",
"scale": "y"
}],
"marks": [{
"type": "group",
"from": {
"facet": {
"name": "series",
"data": "table",
"groupby": "what"
}
},
"marks": [{
"type": "line",
"from": {"data": "series"},
"encode": {
"enter": {
"x": {"scale": "x", "field": "date"},
"y": {"scale": "y", "field": "value"},
"stroke": {"scale": "color", "field": "what"},
"strokeWidth": {"value": 2}
},
"update": {
"interpolate": {"value": "monotone"},
"fillOpacity": {"value": 1}
},
"hover": {
"fillOpacity": {"value": 0.5}
}
}
}]
}]
}

Vega has a property called tickCount that can be added to your axes definitions. Adding this to your y-axis must solve your case:
{
"orient": "left",
"scale": "y",
"tickCount": 4
}
You could use a signal as well if it should be dynamic.
The feature is even more powerful than illustrated. Go check out the docs for other options in below link:
https://vega.github.io/vega/docs/axes/

loop a list of values in fusioncharts multi series chart bar 2D

like I wrote in the title, I have a web page in which I render a list of object from a controller. I have to iterate on it to display values and create a multi series chart bar.
At the end of the process the only value I obtain is the last of the list.
The template of the html page is groovy.
How can I solve and display all the values to obtain a correct chart?
Here is the code:
<script type="text/javascript">
FusionCharts.ready(function(){
var fusioncharts = new FusionCharts({
type: 'msbar2d',
renderAt: 'chart-container',
width: '800',
height: '800',
dataFormat: 'json',
dataSource: {
"chart": {
"caption": "Title",
"subCaption": "Subtitle",
"xAxisname": "x",
"yAxisName": "y",
"plotFillAlpha": "80",
"paletteColors": "#0075c2,#1aaf5d",
"baseFontColor": "#333333",
"baseFont": "Helvetica Neue,Arial",
"captionFontSize": "14",
"subcaptionFontSize": "14",
"subcaptionFontBold": "0",
"showBorder": "0",
"bgColor": "#ffffff",
"showShadow": "0",
"usePlotGradientColor": "0",
"showplotborder": "0",
"valueFontColor": "#ffffff",
"placeValuesInside": "1",
"showHoverEffect": "1",
"rotateValues": "1",
"showXAxisLine": "1",
"xAxisLineThickness": "1",
"xAxisLineColor": "#999999",
"showAlternateHGridColor": "0",
"legendBgAlpha": "0",
"legendBorderAlpha": "0",
"legendShadow": "0",
"legendItemFontSize": "10",
"legendItemFontColor": "#666666",
"exportEnabled": "1"
},
#{list poList, as:'person'}
"categories": [{
"category": [{
"label": "${person?.surname} ${person?.name}"
},]
}],
"dataset": [{
"seriesname": "Ore di straordinario",
"data": [{
"value": "${person?.overtimeHour}"
},]
}, {
"seriesname": "Ore in più",
"data": [{
"value": "${person?.positiveHourForOvertime}"
},]
}],
#{/list}
}
}
);
fusioncharts.render();
});
</script>

Insert data into fusion chart using javascript and jsp

I am using fusion charts in my jsp to present data. Here is the code I am using.
FusionCharts.ready(function(){
var summaryChart = new FusionCharts(
{
type: "line",
renderAt: "chartContainer1",
width: "500",
height: "300",
dataFormat: "json",
"dataSource": {
"chart": {
"caption": "Total Revenues from 2008-2013",
"numberprefix": "$",
"bgcolor": "FFFFFF",
"showalternatehgridcolor": "0",
"plotbordercolor": "008ee4",
"plotborderthickness": "3",
"showvalues": "0",
"divlinecolor": "CCCCCC",
"showcanvasborder": "0",
"tooltipbgcolor": "00396d",
"tooltipcolor": "FFFFFF",
"tooltipbordercolor": "00396d",
"numdivlines": "2",
"yaxisvaluespadding": "20",
"anchorbgcolor": "008ee4",
"anchorborderthickness": "0",
"showshadow": "0",
"anchorradius": "4",
"chartrightmargin": "25",
"canvasborderalpha": "0",
"showborder": "0"
},
"data": [
{
"label": "2009",
"value": "4400000",
"color": "008ee4"
},
{
"label": "2010",
"value": "4800000",
"color": "008ee4"
},
{
"label": "2011",
"value": "5500000",
"color": "008ee4"
},
{
"label": "2012",
"value": "6700000",
"color": "008ee4",
"anchorradius": "7",
"tooltext": "Historical high"
},
{
"label": "2013",
"value": "4200000",
"color": "008ee4"
}
]
}
});
summaryChart.render();
});
I want to add some data that has been read from the database as data to this chart. I tried using arrays inside javascipt and the stuff and still unable to do that.
Please help me.

yes, you can do it by using fusioncharts jsp wrapper
http://www.fusioncharts.com/jsp-charts/
More details about this wrapper
http://www.fusioncharts.com/dev/using-with-server-side-languages/java/introduction.html

how to remove of y -axis label in chart?

could you please tell me remove labels y axis labels .I make a simple chart using fusion library .
http://www.fusioncharts.com/dev/chart-attributes.html?chart=area2d
I saw some y axis label 0$,4$,12$..etc I want to remove that label .I need to show chart like this as shown in image [![enter image description here][1]][1]
http://jsfiddle.net/Tu57h/135/
can we show this on right side as shown in image ?
here is my code
http://jsfiddle.net/Tu57h/135/
FusionCharts.ready(function () {
var salesChart = new FusionCharts({
type: 'msarea',
renderAt: 'chart-container',
width: '450',
height: '300',
dataFormat: 'json',
dataSource: {
"chart": {
"caption": "Sales of Liquor",
"subCaption": "Previous week vs current week",
"xAxisName": "Day",
"numberPrefix": "$",
"paletteColors": "#0075c2,#1aaf5d",
"bgColor": "#ffffff",
"showBorder": "0",
"showCanvasBorder": "0",
"plotBorderAlpha": "10",
"usePlotGradientColor": "0",
"legendBorderAlpha": "0",
"legendShadow": "0",
"plotFillAlpha": "60",
"showXAxisLine": "1",
"axisLineAlpha": "25",
"showValues": "0",
"captionFontSize": "14",
"subcaptionFontSize": "14",
"subcaptionFontBold": "0",
"divlineColor": "#999999",
"divLineIsDashed": "1",
"divLineDashLen": "1",
"divLineGapLen": "1",
"showAlternateHGridColor": "0",
"toolTipColor": "#ffffff",
"toolTipBorderThickness": "0",
"toolTipBgColor": "#000000",
"toolTipBgAlpha": "80",
"toolTipBorderRadius": "2",
"toolTipPadding": "5",
},
"categories": [
{
"category": [
{
"label": "jan 2015"
},
{
"label": "feb 2015"
},
{
"label": "mar 2015"
},
{
"label": "may 2015"
},
{
"label": "jun 2015"
},
{
"label": "jul 2015"
},
{
"label": "aug 2015"
},{
"label": "sep 2015"
},{
"label": "oct 2015"
}
,{
"label": "nov 2015"
},{
"label": "dec 2015"
}
]
}
],
"dataset": [
{
"seriesname": "Previous Week",
"data": [
{
"value": "13000"
},
{
"value": "14500"
},
{
"value": "13500"
},
{
"value": "15000"
},
{
"value": "15500"
},
{
"value": "17650"
},
{
"value": "19500"
}
]
}
]
}
})
.render();
});

What's shown on the right side of your image are trendlines. You can remove the y-axis labels with showYAxisValues: "0" in your chart setup, and add trendlines with:
"trendlines": [
{
"line": [
{
"startvalue": "12000",
"color": "#1aaf5d",
"valueOnRight": "1",
"displayvalue": "$12K"
}
]
}
]
fiddle here http://jsfiddle.net/Tu57h/138/

I'm not sure if the API offers such functionality. However, to hide the y-axis labels, you may target the section of the DOM created by the API and hide it.
setTimeout(function () {
$('#chart-container .fusioncharts-yaxis-0-gridlabels').eq(0).hide();
}, 50);
Fiddle : http://jsfiddle.net/Tu57h/137/ ( I couldn't get it working on jsfiddle but it works fine when running on local machine).

How to remove trlabel value and tlLabel value from the square but it should be there in tooltip in heatmap chart?

I want to add description value from X and Y axies in tooltip of heat map data plots. I achieved that using trLabel and tlLabel properties but as it is used to show that values in top left and top right inside the square box. I don't want that values inside data plot boxes. I want these only in tooltips.
If I'm doing it wrong way, please suggest me the correct way.
Fiddle Showing my approach.
Any help would be appreciated.

I tried solving the your issue, hope this will help you..
FusionCharts.ready(function() {
var salesHMChart = new FusionCharts({
type: 'heatmap',
renderAt: 'chart-container',
width: '550',
height: '270',
dataFormat: 'json',
dataSource: {
"chart": {
"caption": "Top Smartphone Ratings",
"subcaption": "By Features",
"xAxisName": "Features",
"yAxisName": "Model",
"showplotborder": "1",
"xAxisLabelsOnTop": "1",
"plottooltext": "<div id='nameDiv' style='font-size: 12px; border-bottom: 1px dashed #666666; font-weight:bold; padding-bottom: 3px; margin-bottom: 5px; display: inline-block; color: #888888;' >$rowLabel :</div>{br}Rating : <b>$dataValue</b>{br}$columnLabel : <b>$tlLabel</b>{br}<b>$trLabel</b>",
"baseFontColor": "#333333",
"baseFont": "Helvetica Neue,Arial",
"captionFontSize": "14",
"subcaptionFontSize": "14",
"subcaptionFontBold": "0",
"showBorder": "0",
"bgColor": "#ffffff",
"showShadow": "0",
"usePlotGradientColor": "0",
"canvasBgColor": "#ffffff",
"canvasBorderAlpha": "0",
"legendBgAlpha": "0",
"legendBorderAlpha": "0",
"legendShadow": "0",
"legendItemFontSize": "10",
"legendItemFontColor": "#666666",
"toolTipColor": "#ffffff",
"toolTipBorderThickness": "0",
"toolTipBgColor": "#000000",
"toolTipBgAlpha": "80",
"toolTipBorderRadius": "2",
"toolTipPadding": "5",
},
"rows": {
"row": [
{
"id": "SGS5",
"label": "Samsung Galaxy S5"
},
{
"id": "HTC1M8",
"label": "HTC One (M8)"
},
{
"id": "IPHONES5",
"label": "Apple iPhone 5S"
},
{
"id": "LUMIA",
"label": "Nokia Lumia 1520"
}
]
},
"columns": {
"column": [
{
"id": "processor",
"label": "Processor"
},
{
"id": "screen",
"label": "Screen Size"
},
{
"id": "price",
"label": "Price"
},
{
"id": "backup",
"label": "Battery Backup"
}
,
{
"id": "cam",
"label": "Camera"
}
]
},
"dataset": [
{
"data": [
{
"rowid": "SGS5",
"columnid": "processor",
"value": "8.7",
"tllabel": "Quad Core 2.5 GHz",
"trlabel": "OS : Android 4.4 Kitkat"
},
{
"rowid": "SGS5",
"columnid": "screen",
"value": "8.5",
"tllabel": "5.1 inch",
"trlabel": "AMOLED screen"
},
{
"rowid": "SGS5",
"columnid": "price",
"value": "9.3",
"tllabel": "$600"
},
{
"rowid": "SGS5",
"columnid": "backup",
"value": "9.7",
"tllabel": "29 Hrs",
"trlabel": "Battery : 2800 MAH"
},
{
"rowid": "SGS5",
"columnid": "cam",
"value": "8",
"tllabel": "16 MP",
"trlabel": "Front Camera : 2.1 MP"
},
{
"rowid": "HTC1M8",
"columnid": "processor",
"value": "9.2",
"tllabel": "Quad Core 2.3 GHz",
"trlabel": "OS : Android 4.4 Kitkat"
},
{
"rowid": "HTC1M8",
"columnid": "screen",
"value": "8.3",
"tllabel": "5 inch",
"trlabel": "LCD screen"
},
{
"rowid": "HTC1M8",
"columnid": "price",
"value": "7.3",
"tllabel": "$600"
},
{
"rowid": "HTC1M8",
"columnid": "backup",
"value": "8.8",
"tllabel": "20 Hrs",
"trlabel": "Battery : 2600 MAH"
},
{
"rowid": "HTC1M8",
"columnid": "cam",
"value": "8.7",
"tllabel": "4 MP",
"trlabel": "Front Camera : 5 MP"
},
{
"rowid": "IPHONES5",
"columnid": "processor",
"value": "9.1",
"tllabel": "Dual Core",
"trlabel": "OS : iOS 7"
},
{
"rowid": "IPHONES5",
"columnid": "screen",
"value": "8.6",
"tllabel": "4 inch",
"trlabel": "Retina LCD screen"
},
{
"rowid": "IPHONES5",
"columnid": "price",
"value": "7.2",
"tllabel": "$649"
},
{
"rowid": "IPHONES5",
"columnid": "backup",
"value": "8.4",
"tllabel": "10 Hrs",
"trlabel": "Battery : 1560 MAH"
},
{
"rowid": "IPHONES5",
"columnid": "cam",
"value": "9.5",
"tllabel": "8 MP",
"trlabel": "Front Camera : 1.2 MP"
},
{
"rowid": "LUMIA",
"columnid": "processor",
"value": "8.8",
"tllabel": "Quad Core 2.2 GHz",
"trlabel": "OS: Windows Phone 8"
},
{
"rowid": "LUMIA",
"columnid": "screen",
"value": "9.1",
"tllabel": "6 inch",
"trlabel": "LCD screen"
},
{
"rowid": "LUMIA",
"columnid": "price",
"value": "9.7",
"tllabel": "$470"
},
{
"rowid": "LUMIA",
"columnid": "backup",
"value": "9.2",
"tllabel": "27 Hrs",
"trlabel": "Battery : 3400 MAH"
},
{
"rowid": "LUMIA",
"columnid": "cam",
"value": "8.1",
"tllabel": "20MP",
"trlabel": "Front Camera : 1.2 MP"
}
]
}
],
"colorRange": {
"gradient": "1",
"minValue": "0",
"code": "#e24b1a",
"startLabel": "Poor",
"endLabel": "Good",
"color": [
{
"code": "#e24b1a",
"minValue": "1",
"maxValue": "5",
"label": "Bad"
},
{
"code": "#f6bc33",
"minValue": "5",
"maxValue": "7",
"label": "Average"
},
{
"code": "#6da81e",
"minValue": "7",
"maxValue": "10",
"label": "Good"
}
]
}
}
});
salesHMChart.render();
});

Try using "toolText" attribute.
"toolText": "8.7 {br} Quad Core 2.5 GHz {br} OS : Android 4.4 Kitkat"