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Make a bar chart in Chart.js with a legend that reflects the labels in the X-axis

In Charts.js, i am trying to create a bar chart with a single data set and each column being differently coloured.
The desired result would look like this:
However, when i try to create something like this, at best, i get the following
The following code is the chart config object used to initialise the chart:
var config_canvas_alerts = {
type: 'bar',
data: {
datasets: [{
data: [
value0,value1,value2,value3,
],
backgroundColor: [
"#F7464A","#46BFBD","#FDB45C","#949FB1",
],
}],
labels: [
"Move - Match " + value0,
"Move - Unmatch " + value1,
"Permit - Match " + value2,
"Permit - UnMatch" + value3,
]
},
options: {
responsive: true,
legend: {
position: 'right',
onClick: function (e, p) {
alert(p.text);
},
},
title: {
display: true,
text: '#Model.mgt_dash_alert.graph_title',
position: 'top',
fontStyle: 'normal',
fontSize: 14,
padding: 10
}
}
};
I have tried to restructure the data so that each data value becomes its own dataset object with accompanying value, background colour and label but that didnt work out well either.
The only way i was able to achieve this (and hence how i generated the first screenshot) was by dynamically changing the graph from a pie chart to a bar chart after initialisation. The legend seemed to work well.
Changing dynamically from pie to bar chart is not ideal. Any suggestions here?

disable hover on special slice of pie chart

I know how to disable hover on highcharts, and I edit the answer to disable hove on special slice as this demo, but it doesn't work.
I edit series attribute as the following:
series: [{
showInLegend: false,
type: 'pie',
name: 'Pie Chart',
data: [
['Mobile', 65], // first half of pie
{
name: 'Other',
y: 35,
tooltip: { enabled: false }
} // second half of pie
]
How can I disable hover for special slices on pie charts using highcharts ?

You were pretty close with your custom tooltip property idea. I personally rather using custom names as well, therefor instead of adding a tooltip data object, i'd use a custom property named tooltipDisabled:
{name: 'Other', y: 35, tooltipDisabled:true} // second half of pie
And then, using a tooltip formatter function (a callback function called when a point is hoverd, which is totally override-able), I'd discriminate the points with this property:
tooltip: {
useHTML:true,
formatter: function(){
return this.point.tooltipDisabled ? false : this.point.name +"<br><span style='font-size:18px;vertical-align:middle'>•</span>"+this.series.name+": <b>"+this.y+"</b>";
}
returning false, as you have probably guessed, disables the tooltip.
(as you can see I also added useHTML:true, so highcharts renders the bullet next to the point name.
See fiddle: http://jsfiddle.net/e7brd9do/2/

ExtJS 4.2.1 Chart Axis labeling

i do have a chart in my application with many x-values. The labeling doesnt seem to work fine because there is e.g. no space between the labels like this:
I know i could make the labels vertical, though is there an other option to scale/place the labels mor intelligent? Or is doing it vertically the way to go?

I guess my first thought is are your labels the same length every time?
Vertical labeling is often preferred because in many of the examples given we are using variable lengths for things like names.
Does your chart scroll off the screen because of all the columns? just curious.
Now you could try creating the grid with a set width to the columns, something like this and see how it does.
series: [{
....
renderer: function(sprite, storeItem, barAttr, i, store) {
// set a width that gives you enough space
barAttr.width = 60;
return barAttr;
},
....
now looking over my code I often use the Ext.String.ellipsis function to set the length of my labels under my columns. so something like this below where I trim at 8 characters:
axes: [{
type: 'Category',
position: 'bottom',
fields: ['name'],
label: {
renderer: function(v) {
return Ext.String.ellipsis(v, 8);
},
}
....

It work for me
{
type: 'Category',
position: 'bottom',
fields: ['time'],
title: 'Time',
style: {
textAlign: 'center',
},
label: {
rotate: {
degrees: 270
}
}
}
enter image description here

Highcharts chart categories not displaying correctly

EDIT: Here's a fiddle, thanks to JordanD for getting it displaying something:
jsfiddle.net
EDIT(2): From what I can tell, this is how a single series chart displays. Adding a second series (a second element in the data array) causes the chart to display as I expected it to, but with one series, it is basically centered instead of justified. Therefore, it's not 'broken', it just doesn't behave as I expected it to.
The data series is in the form of an array of objects in the form of:
name: 'string'
data: ['array', 'of', 'data']
As can be seen in the image, my x-axis categories are displaying as a string. It's being set as
categories: dates
Where dates is an array with an array of dates in the first index. It appears that the only thing displaying in the categories is the first element of the array. Even if I try
categories: ['this', 'is', 'a', 'test']
the only thing that will show is 'this'.
and here is the console log to accompany it with a small sample of the data:
and here is the call to instantiate the chart:
$("#chart").highcharts({
chart: {
type: 'column'
},
title: {
text: 'report for ' + result[0].Name
},
xAxis: {
categories: date
},
yAxis: {
title:
{
text: 'Number'
}
},
series: dataSeries
});
What I'm trying to get is for the x-axis labels (and the columns themselves) to be spaced out to take up the full width of the chart.

The problem is that you have 9 series and each point have the same x, so each serie starts on the same tick and you have result which you have.
Solutions:
use one serie and set up a color for each point
use pointStart for each serie
set data as pairs [x,y] but xAxis should be category type.

If I understand your problem correctly an easy fix might be to add a data type to your axis.
type : 'datetime'
$("#chart").highcharts({
chart: {
type: 'column'
},
title: {
text: 'report for ' + result[0].Name
},
xAxis: {
categories: date,
type : 'datetime'
},
yAxis: {
title:
{
text: 'Number'
}
},
series: dataSeries
});

Can the colors on charts in ExtJs/ YUI Charts be changed dynamically?

I am using ExtJs/ YUI charts in my application.
What I am wondering, is it possible to dynamically change the color on any of the charts based on data?
i.e. I have a store which contains a field holding the hex color for that particular row. Is it possible to dynamically set the color of a bar in the bar chart with the hex value?

Take a look at this blog post. When you are configuring the chart object, pass a series object with a style property as described in that post to define the colors and their sequence.
Then you just need to get your colors by either looping through your store records and building a new array, or perhaps pulling it from your store with store.query. Then pass this array as the property.
(...),
series: [style: { colors: arrayBuiltFromStore }],
(...)

From what I've been able to find, you can use the
(...),
series: [style: {colors: arrayBuiltFromStore }],
(...)
method if you're creating a pie chart (or another chart with series.colors attribute), and it works great.
If you're using a type of chart that doesn't support series.colors... it gets a little more convoluted. I found that using the renderer method works fairly well. The only problem with this method (that I can see right away) is that it doesn't change the colors in the legend. It would take some further editing to see if this could be pulled from the store.
If you figure out the legend issue, let me know, but I hope this helps.
Note: Not all the variables used in the below script are populated in the script.
function myColorer(rec) {
var aFiller = new Array('#0000FF','#31CD31','#FFFF00','#FF0000');
return aFiller[rec];
}
Ext.onReady(function() {
var sDataStore = new Ext.data.JsonStore(sPathToDataStore);
chart = new Ext.chart.Chart({
renderTo: document.getElementById('test-graph'),
width: 800,
height: 600,
animate: true,
store: sDataStore,
legend: {
position: 'right',
isVertical: true,
},
axes: [{
type: 'Numeric',
grid: true,
position: 'left',
fields: ['field1','field2','field3','field4'],
title: 'Title Here',
grid: {
odd: {
opacity: 1,
fill: '#ddd',
stroke: '#bbb',
'stroke-width': 1
}
},
minimum: 0,
adjustMinimumByMajorUnit: 0
}, {
type: 'Category',
position: 'bottom',
fields: label1,
title: sXAxisLabel,
grid: true,
}],
series: [{
renderer: function(sprite, record, curAttr, index, store) {
var color = myColorer(index);
return Ext.apply(curAttr, {
fill: color
});
},
type: 'area',
highlight: false,
axis: 'left',
xField: label1,
yField: ['field1','field2','field3','field4'],
style: {
opacity: 0.93
}
}]
});
});

Try this:
Create a hidden field and assign its value to the value of the store field which contains the colour value.
when rendering bar chart, set the background colour of a bar to the value of the hidden field.

Yes, you can do it by using renderers. Following code example changes colors of bars in bar chart:
series: {
type: 'bar',
xField: 'name',
yField: 'value',
label:{
field: 'value'
},
renderer: function(sprite, config, rendererData, index) {
var record = rendererData.store.getData().items[index];
return Ext.apply(rendererData, {
fillStyle: record.data.color,
});
}
}
Here 'color' is a field of the store model. You can set different color for each bar by setting it in corresponding record in your store.