Develop Reference

JavaScript - iterating through an array for checking condition

I am creating a high charts graph that I would like to dynamically give the graph color to depending on the title of an object. I currently have an array graphData that has an object title.
I have 5 possible results of titles:
"LOW", "MEDIUM-LOW", "MEDIUM", "MEDIUM-HIGH", AND "HIGH"
I am now attempting to iterate through my array and assign a color depending on what title the index has.
My entire graph receives one color based off the last title of the array. I would like the color to effect each index of the array seperartely.
For example: if "MEDIUM-HIGH" is the last title in the array, my entire graph gets #DD5F0C
Here is my code:
Array:
graphData: [ […]
​
0: Object { title: "LOW", result: 62582 }
​
1: Object { title: "MEDIUM-LOW", result: 57758 }
​
2: Object { title: "LOW", result: 8795 }
​
3: Object { title: "HIGH", result: 262525 }
​
4: Object { title: "MEDIUM-HIGH", result: 167168 } ]
let graphColor = ""
for (i = 0; i < graphData.length; i++) {
if (graphData[i].title === "LOW") {
graphColor = "#0D6302"
} else if (graphData[i].title === "MEDIUM-LOW") {
graphColor = "#0B7070"
} else if (graphData[i].title === "MEDIUM") {
graphColor = "#DC9603"
} else if (graphData[i].title === "MEDIUM-HIGH") {
graphColor = "#DD5F0C"
} else if (graphData[i].title === "HIGH") {
graphColor = "#C50710"
}
}
HighCharts code :
Highcharts.chart('container', {
chart: {
type: 'bar'
},
title: {
text: "Bar Graph"
},
xAxis: {
},
yAxis: {
min: 0,
formatter: function() {
return this.value + "%";
},
title: {
text: '% of Total'
}
},
legend: {
reversed: false
},
plotOptions: {
series: {
stacking: 'normal'
}
},
series: [{
name: `graphData[0].title`,
color: graphColor,
data: [graphData[0]],
}, {
name: 'graphData[1].title',
color: graphColor,
data: [graphData[1]],
showInLegend: false,
linkedTo: ":previous"
}, {
name: 'graphData[2].title,
color: graphData[0].title,
data: [graphData[2]]
}, {
name: graphData[3].title,
color: '#DC9603',
data: [graphData[3]]
}, {
name: graphData[4].title,
color: graphColor,
data: [graphData[4]]
}, {
name: graphData[5].title,
color: graphColor,
data: [graphData[5]]
}]
});
I am expecting my "color" to be dynamically generated based off of what graphData.title equals for that specific index.

You are having trouble because you have graphData.length number of entries, but only one graphColor variable to hold the color. Your code samples don't look complete so I'll make some assumptions about how the surrounding code must be. I recommend building up your series data in the for-loop directly so you can just use it in the Highcharts.chart call. The code is easier to read that way and probably more flexible too if you need to have more data rows.
// build the series data array here so it's simple to use in the chart call
const series = new Array(graphData.length);
for (let i = 0; i < graphData.length; i++) {
let graphColor = "#000000"; // a default color just in case
// can use if/else or a switch here
if (graphData[i].title === "LOW") {
graphColor = "#0D6302";
} else if (graphData[i].title === "MEDIUM-LOW") {
graphColor = "#0B7070";
} else if (graphData[i].title === "MEDIUM") {
graphColor = "#DC9603";
} else if (graphData[i].title === "MEDIUM-HIGH") {
graphColor = "#DD5F0C";
} else if (graphData[i].title === "HIGH") {
graphColor = "#C50710";
}
series[i] = {
name: graphData[i].title,
color: graphColor,
data: [graphData[i].result]
};
}
// Adjust the series data as needed
series[1].showInLegend = false;
series[1].linkedTo = ":previous";
Highcharts.chart("container", {
chart: { type: "bar" },
title: { text: "Bar Graph" },
xAxis: {},
yAxis: {
min: 0,
formatter: function() {
return this.value + "%";
},
title: { text: "% of Total" }
},
legend: { reversed: false },
plotOptions: { series: { stacking: "normal" } },
series: series
});

Not sure if I've properly understood what are you trying to do, but try this way:
const colorMap = { "LOW":"#0D6302",
"MEDIUM-LOW": "#0B7070",
"MEDIUM": "#DC9603",
"MEDIUM-HIGH": "#DD5F0C",
"HIGH":"#C50710"
}
...
series: [{
name: `graphData[0].title`,
color: colorMap[graphData[0].title],
data: [graphData[0]],
}, {

In the Highchart way - you can iterate through the series after chart initialization and set the wanted colors by particular series.
Demo: https://jsfiddle.net/BlackLabel/6hm4ebna/
chart: {
type: 'bar',
events: {
load() {
let chart = this;
chart.series.forEach(s => {
console.log(s)
if (s.name === 'test1') {
s.update({
color: 'red'
})
}
else if (s.name === 'test3') {
s.update({
color: 'green'
})
}
})
}
}
},
API: https://api.highcharts.com/highcharts/chart.events.load
If this wouldn't help please reproduce your attempt with the sample data on the online editor which I could work on.

How to show more than one "dataMax" in Highcharts?

Currently, I'm showing a max point in the line chart. But I want to change dataMax to top 5 max value points in chart.How can I achieve this in Highcharts?
var defaultData = 'urlto.csv';
var urlInput = document.getElementById('fetchURL');
var pollingCheckbox = document.getElementById('enablePolling');
var pollingInput = document.getElementById('pollingTime');
function createChart() {
Highcharts.chart('closed5', {
chart: {
type: 'area',
zoomType: 'x'
},
plotOptions: {
series: {
dataLabels: {
enabled: true,
style: {},
formatter: function() {
if (this.y === this.series.dataMax) {
return this.y;
}
}
}
}
},
title: {
text: 'Chart for charting'
},
data: {
csvURL: urlInput.value,
enablePolling: pollingCheckbox.checked === true,
dataRefreshRate: parseInt(pollingInput.value, 10)
}
});
if (pollingInput.value < 1 || !pollingInput.value) {
pollingInput.value = 1;
}
}
urlInput.value = defaultData;
// We recreate instead of using chart update to make sure the loaded CSV
// and such is completely gone.
pollingCheckbox.onchange = urlInput.onchange = pollingInput.onchange = createChart;
// Create the chart
createChart();

As #ewolden rightly noticed, you can sort your data and show only the five highest values:
var data = [11, 22, 33, 44, 55, 66, 15, 25, 35, 45, 55, 65],
sortedData = data.slice().sort(function(a, b){
return b - a
});
Highcharts.chart('container', {
series: [{
data: data,
dataLabels: {
enabled: true,
formatter: function() {
if (sortedData.indexOf(this.y) < 5) {
return this.y;
}
}
}
}]
});
Live demo: http://jsfiddle.net/BlackLabel/xkf2w5tb/
API: https://api.highcharts.com/highmaps/series.mapbubble.dataLabels.formatter

As far as I know formatter callback is the way to format the data labels. If you want to show the top N points you should sort the data in a new array and pull the top 5 values. This is an example of how to clone and sort the array and extract the top 5 elements in the formatter call.
let data = [32, 10, 20, 99, 30, 54, 85, 56, 11, 26, 15, 45, 55, 65];
//Copy the array
let temp = data.slice();
// Sort the temp array in descending order
temp.sort((a, b) => b - a);
Highcharts.chart('closed5', {
chart: {
type: 'area',
zoomType: 'x'
},
title: {
text: 'Chart for charting'
},
series: [{
data: data,
dataLabels: {
enabled: true,
formatter: function() {
if (temp.indexOf(this.y) < 5) {
return this.y;
}
},
},
}]
});
<script src="https://code.highcharts.com/highcharts.js"></script>
<div id="closed5"></div>

Highcharts Using CSV instead of JSON

I tried the code like this with many small restructuration and modification but without success.
Here is the code:
$(function () {
$.get('data.csv', function(data) {
// split the data set into ohlc and volume
var ohlc = [],
volume = [],
dataLength = data.length,
// set the allowed units for data grouping
groupingUnits = [[
'week', // unit name
[1] // allowed multiples
], [
'month',
[1, 2, 3, 4, 6]
]],
i = 0;
for (i; i < dataLength; i += 1) {
ohlc.push([
data[i][0], // the date
data[i][1], // open
data[i][2], // high
data[i][3], // low
data[i][4] // close
]);
volume.push([
data[i][0], // the date
data[i][5] // the volume
]);
}
$('#chart').highcharts({
rangeSelector: {
selected: 1
},
title: {
text: 'AAPL Historical'
},
yAxis: [{
labels: {
align: 'right',
x: -3
},
title: {
text: 'OHLC'
},
height: '60%',
lineWidth: 2
}, {
labels: {
align: 'right',
x: -3
},
title: {
text: 'Volume'
},
top: '65%',
height: '35%',
offset: 0,
lineWidth: 2
}],
data: {
csv: data
},
series: [{
type: 'candlestick',
name: 'AAPL',
data: ohlc,
dataGrouping: {
units: groupingUnits
}
}, {
type: 'column',
name: 'Volume',
data: volume,
yAxis: 1,
dataGrouping: {
units: groupingUnits
}
}]
});
});
});
Here is data.csv:
Date,Open,High,Low,Close,Volume
2013-12-20,9371.08,9413.09,9352.98,9400.18,161686900
2013-12-19,9279.68,9351.9,9257.24,9335.74,98276500
2013-12-18,9145.35,9190.73,9122.05,9181.75,82342700
2013-12-17,9142.75,9161.8,9085.12,9085.12,72207500
2013-12-16,9004.62,9187.78,8997.75,9163.56,99105600
2013-12-13,9016.78,9046.63,8990.58,9006.46,67761700
2013-12-12,9032.67,9060.54,8984.28,9017,75120200
2013-12-11,9093.26,9153.14,9065.51,9077.11,64845800
2013-12-10,9180.29,9223.73,9091.97,9114.44,74363400
Can you help me to figure out the problem or purpose new approch please ?
What is my goal ?
Is to be able to load a CSV file inside the chart instead of using JSON file.
Why ?
Because modifing CSV file is more easier for me using PHP than JSON, and it's for performance too.
Thank's

When you do data.length, you are getting length of the csv file string. What you need to do is split the data with the newline delimiter.
// sample from data
var data = `Date,Open,High,Low,Close,Volume
2013-12-20,9371.08,9413.09,9352.98,9400.18,161686900
2013-12-19,9279.68,9351.9,9257.24,9335.74,98276500`;
// split by \n (new line)
data = data.split('\n'); // now data is an array of rows
var finalObj = [];
// iterate over the rows
data.map(function(row){
var obj = {};
// row is a string separated by ','
row = row.split(','); // now row is an array
obj['date'] = row[0];
obj['open'] = row[1];
obj['high'] = row[2];
obj['low'] = row[3];
obj['close'] = row[4];
obj['volume'] = row[5];
finalObj.push(obj);
})
console.log(finalObj);
Output:
[
{
date:'Date',
open:'Open',
high:'High',
low:'Low',
close:'Close',
volume:'Volume'
},
{
date:'2013-12-20',
open:'9371.08',
high:'9413.09',
low:'9352.98',
close:'9400.18',
volume:'161686900'
},
{
date:'2013-12-19',
open:'9279.68',
high:'9351.9',
low:'9257.24',
close:'9335.74',
volume:'98276500'
}
]

Highcharts visualize, style series

I'm using Highcharts.visualize to draw the graph from a table containing the data.
You can test my working code here: http://jsfiddle.net/S2XM8/1/
I have two questions:
I want to have a separate styling for my "Additional value". How do I go about it?
Can I add data for the X-axis via the javascript? For example if I need to fill in the gap between 2014-05-27 and 2014-05-25 in the table.
Highcharts.visualize = function (table, options, tableClass) {
// the categories
options.xAxis.categories = [];
$('tbody th', table).each( function () {
options.xAxis.categories.push(this.innerHTML);
});
// the data series
options.series = [];
$('tr', table).each( function (i) {
var tr = this;
$('.graph', tr).each( function (j) {
if (i === 0) { // get the name and init the series
options.series[j] = {
name: this.innerHTML,
data: []
};
} else { // add values
options.series[j].data.push(parseFloat(this.innerHTML));
console.log(this.innerHTML);
}
});
});
options.title = { text: 'Some graph' };
$('#' + tableClass + '-graph').highcharts(options);
};
var tableNumber = document.getElementById('rank-table'),
options = {
chart: {
zoomType: 'x'
},
xAxis: {
tickInterval: 30,
reversed: true,
labels: {
rotation: 45
},
type: 'datetime',
dateTimeLabelFormats: { // don't display the dummy year
month: '%e. %b',
year: '%b'
}
},
yAxis: {
title: {
text: 'Rank'
},
min: 1,
reversed: true
},
legend: {
layout: 'vertical',
align: 'middle',
verticalAlign: 'bottom',
borderWidth: 0
}
};
Highcharts.visualize(tableNumber, options, 'number');

Both things are possible, but require to modify visualize method, see: http://jsfiddle.net/S2XM8/4/
You can set series options in a chart and then merge with data:
series: [{
// nothing special
}, {
type: 'column' // set series type for example
}]
And merging:
options.series[j] = options.series[j] || {};
options.series[j].name = this.innerHTML,
options.series[j].data = [];
Check parsed value before passing as point value:
var value = parseFloat(this.innerHTML);
if(isNaN(value)) { //null value - produces NaN when parsing
options.series[j].data.push(10);
} else {
options.series[j].data.push(value); // push value to the series
}

Remove starting "0" values from Highcharts series array

I have following generated JavaScript-Code to display a chart with HighCharts:
<script type="text/javascript">
var highchartsOptions = Highcharts.setOptions(Highcharts.theme);
var TaskChart; // Chart-Objekt
var TaskDuration = new Array();
// Save starting points to javascript variables for HighCharts
var startingUTC = 1288102643364;
TaskDuration = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,206,216,216,206,206];
for(var i = 0; i < TaskDuration.length; i++) {
if(TaskDuration[i] == 0) {
TaskDuration[i] = null;
}
}
</script>
<script type="text/javascript">
$j(document).ready(function() {
TaskChart = new Highcharts.Chart({
credits: {
enabled: false
},
chart: {
renderTo: "chart01",
defaultSeriesType: 'area',
zoomType: 'x',
spacingBottom: 250
},
title: {
text: "Task Duration"
},
xAxis: {
type: 'datetime',
dateTimeLabelFormats: {
week: '%e. %b %Y'
},
offset: 10,
startOnTick: true,
maxZoom: 7 * 24 * 3600000 // seven days
},
yAxis: {
title: {
text: "Duration"
}
},
tooltip: {
formatter: function() {
return '<b>'+ this.series.name +'</b><br/>';
}
},
plotOptions: {
area: {
stacking: 'normal',
lineColor: '#666666',
lineWidth: 1,
marker: {
lineWidth: 1,
lineColor: '#666666'
}
}
},
series: [
{
name: 'Duration',
pointStart: startingUTC,
pointInterval: 24*60*60*1000,
data: TaskDuration
}]
});
});
</script>
The problem is now that I want to remove all the "0" values from the beginning of the TaskDuration series array.
I try to set the values in the array to 'null':
for(var i = 0; i < TaskDuration.length; i++) {
if(TaskDuration[i] == 0) {
TaskDuration[i] = null;
}
}
But Highcharts still display the values in the chart.
How to prevent this behavior?
I also try to remove all values from the array until a value which is not "0". But with this approach the "startingUTC" is wrong. Maybe I have also to recalculate this value...
Regards,
Sandro

You need to remove elements not to set null, use this to remove zero element from array:
var myArray=[];
for(var i = 0; i < TaskDuration.length; i++) {
if(TaskDuration[i] != 0) {
myArray.push(TaskDuration[i]);
}
}
working JSfiddle

The problem is that you're using pointStart and pointInterval.
PointInterval will ignore your null points and will add points to the yAxis.
So, remove it.
series: [{
name: 'Duration',
data: TaskDuration
}]