Chart JS Zoom Pan - chart.js

I am using the Chart JS Zoom/Pan Plugin (https://github.com/chartjs/chartjs-plugin-zoom) and was wondering if there is a way to disable it when there is no data present. The current basic options settings are
pan: {
enabled: true,
mode: 'x'
},
zoom: {
enabled: true,
mode: 'x'
}

Yes, you can change this by setting "enabled" to false and/or use chart.resetZoom() link

Try this:
// since myChart.update() is not working. You need to do this.
var myChartOptions = myChart.options; // need to store in variable.
// check data present
if (data.length > 0) {
myChartOptions.pan.enabled = true;
myChartOptions.zoom.enabled = true;
myChart.options = myChartOptions; // update myChart.options.
}
else {
myChartOptions.pan.enabled = false;
myChartOptions.zoom.enabled = false;
myChart.options = myChartOptions; // update myChart.options.
}

Related

Oracle Apex- Interactive Grid- Reset Button

In the Interactive Grid Toolbars of Oracle APEX, How can we make the reset button to show as icon only button.
I found another way by adding the jsinitialization code in the attribute section of Interactive Grid as below
function(config) {
var $ = apex.jQuery,
toolbarData = $.apex.interactiveGrid.copyDefaultToolbar(),
lastToolbarGroup = toolbarData[toolbarData.length - 1],
createButton = {
type: "BUTTON",
icon: "a-Icon icon-ig-reset",
iconOnly: true,
action: "reset-report"
};
lastToolbarGroup.controls.pop();
lastToolbarGroup.controls.push(createButton);
config.toolbarData = toolbarData;
config.initialSelection = false;
return config;
}
I do not think I understood your question ... :) but...
I do not think there is a way to edit this feature of interactive grid. It is possible through javascript, but I think it is an unnecessary work.
$('button[data-action=reset-report] > span.a-Button-label').remove()
Or CSS
button[data-action=reset-report] > span.a-Button-label {
display: none;
}

chartjs - top and bottom padding of a chart area

I need to add more space above and below chart area (near top and bottom scale).
It seems that only ability to add a padding to the vertical axes.
I disabled tick lines according to documentation:
http://www.chartjs.org/docs/#scales:
Chart.defaults.scale.gridLines.drawTicks = false;
chartjs chart area top and bottom paddings image:
Also I can add padding to vertical axes scale labels (ticks)
Chart.defaults.scale.ticks.padding = 15;
How can I add a padding above a top scale and below a bottom (zero) scale?
There are a few ways to control padding between scales/legends in chart.js (some official ways documented in the docs and some "hacky" ways described elsewhere). The problem is, there just isn't a way to use the existing configuration options to control padding through out the chart (left scale, bottom scale, top scale...or bottom of legend, etc.).
Fortunately, because of the flexible chart.js interfaces (and because we can create new scale types, etc.), it is still possible to control the padding without too much fuss. Let me explain the way to add left, top, and bottom padding and then provide a working example at the end very end (skip ahead if you so desire).
Left Padding
This one is easy. There is a documented option to control this. Just set the scales.yAxes.ticks.padding option to whatever value you want. Here is an example.
scales: {
yAxes: [{
ticks: {
beginAtZero: true,
padding: 25,
}
}]
}
Top Padding (or Legend Padding)
There is no option to control this so we have to build it in. I built it in by creating a new Legend object and overwriting the afterFit() function that uses a paddingBottom option set on the options object. This isn't too difficult but requires a round around way to do it. Here is the relevant code.
function getBoxWidth(labelOpts, fontSize) {
return labelOpts.usePointStyle ?
fontSize * Math.SQRT2 :
labelOpts.boxWidth;
};
Chart.NewLegend = Chart.Legend.extend({
afterFit: function() {
this.height = this.height + this.options.paddingBottom;
},
});
function createNewLegendAndAttach(chartInstance, legendOpts) {
var legend = new Chart.NewLegend({
ctx: chartInstance.chart.ctx,
options: legendOpts,
chart: chartInstance
});
if (chartInstance.legend) {
Chart.layoutService.removeBox(chartInstance, chartInstance.legend);
delete chartInstance.newLegend;
}
chartInstance.newLegend = legend;
Chart.layoutService.addBox(chartInstance, legend);
}
// Register the legend plugin
Chart.plugins.register({
beforeInit: function(chartInstance) {
var legendOpts = chartInstance.options.legend;
if (legendOpts) {
createNewLegendAndAttach(chartInstance, legendOpts);
}
},
beforeUpdate: function(chartInstance) {
var legendOpts = chartInstance.options.legend;
if (legendOpts) {
legendOpts = Chart.helpers.configMerge(Chart.defaults.global.legend, legendOpts);
if (chartInstance.newLegend) {
chartInstance.newLegend.options = legendOpts;
} else {
createNewLegendAndAttach(chartInstance, legendOpts);
}
} else {
Chart.layoutService.removeBox(chartInstance, chartInstance.newLegend);
delete chartInstance.newLegend;
}
},
afterEvent: function(chartInstance, e) {
var legend = chartInstance.newLegend;
if (legend) {
legend.handleEvent(e);
}
}
});
Bottom Padding
There is also no option to control this, so we have to also build it in. Since we are dealing with a scale here, the best way to do this is extending the 'category' scale and add logic to handle a scale paddingTop option. After reading through the source, we need to overwrite the draw() function to do this. Here is the relevant code (see my example for the full implementation).
// ...
if (isHorizontal) {
if (options.position === 'bottom') {
// bottom
textBaseline = !isRotated? 'top':'middle';
textAlign = !isRotated? 'center': 'right';
labelY = me.top + tl + me.options.paddingTop;
} else {
// top
textBaseline = !isRotated? 'bottom':'middle';
textAlign = !isRotated? 'center': 'left';
labelY = me.bottom - tl;
}
}
// ...
Here is a codepen example showing all this put together.
Edit: This does not provide provide padding inside the chart (which is what this question is originally about), but rather adds a padding around the chart
For those still looking for this that might end up here in a google search (like me), it seems to have been solved in a later version: https://www.chartjs.org/docs/latest/configuration/layout.html#padding
let chart = new Chart(ctx, {
type: 'line',
data: data,
options: {
layout: {
padding: {
left: 50,
right: 0,
top: 0,
bottom: 0
}
}
}
});
For ChartJs version 3 you can remove tickLenght:
scales: {
x: {
grid: {
tickWidth:0,
tickLength: 0,
},
y: {
grid: {
tickWidth:0,
tickLength: 0,
},
...
}
This does not add padding between the chart and legend but the above code no longer seems to work on Chart.js v3 and above. Here is a workaround plugin that pads the y-axis to ensure labels (only checked with chartjs-plugin-datalabels) fall within the chart.
var pluginAutoAdjustRangeY = {
id: 'autoAdjustRangeY',
beforeInit: function(chartInstance) {
var legendOpts = chartInstance.options.legend;
if (legendOpts) {
chartInstance.legend.afterFit = function(){
var max = 0;
var min = 0;
var datasets = chartInstance.data.datasets.length
for(let i = 0; i < datasets; i++){
var points = chartInstance.data.datasets[i].data.length
for(let p = 0; p < points; p++){
var v = parseFloat(chartInstance.data.datasets[i].data[p]);
if(v > max) max = v;
if(v < min) min = v;
}
}
var range = parseInt((max - min) * ((chartInstance.options.legend.padding) || 0));
chartInstance.options.scales.y.max = parseInt(max + range);
if(min !== 0) chartInstance.options.scales.y.min = parseInt(min - range);
}
}
},
beforeLayout: function(chartInstance) { //2
if(chartInstance.options.legend){
if(chartInstance.legend.afterFit){
chartInstance.legend.afterFit();
}
}
},
};
And can be used by as such:
options: {
legend: {
padding: 0.15, //percentage of Y range to pad ends of axis
}
}

Is there a way to filter data in Chart.js?

I'm working with Chart.js and I'm wondering if there's a way when you click on part of a pie chart, it filters the bar chart.
Since this is a Chart.js question :-), this is how you do it Chart.js (and it's not too complex either)
Setting up the Pie Chart
// pie
var data = [
{
value: 300,
color: "#F7464A",
highlight: "#FF5A5E",
label: "Red",
subData: [28, 48, 40, 19, 86, 27, 190]
}, {
value: 50,
color: "#46BFBD",
highlight: "#5AD3D1",
label: "Green",
subData: [90, 28, 48, 40, 19, 86, 127]
}, {
value: 100,
color: "#FDB45C",
highlight: "#FFC870",
label: "Yellow",
subData: [28, 48, 40, 19, 86, 27, 190]
}
]
var canvas = document.getElementById("chart");
var ctx = canvas.getContext("2d");
var myPieChart = new Chart(ctx).Pie(data);
Setting up the Bar Chart using Pie Data
// bar using pie's sub data
var bardata = {
labels: ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"],
datasets: [
{
label: "My Second dataset",
fillColor: "rgba(151,187,205,0.5)",
strokeColor: "rgba(151,187,205,0.8)",
highlightFill: "rgba(151,187,205,0.75)",
highlightStroke: "rgba(151,187,205,1)",
data: data[0].subData.map(function (point, i) {
var pointTotal = 0;
data.forEach(function (point) {
pointTotal += point.subData[i]
})
return pointTotal;
})
}
]
};
var subcanvas = document.getElementById("subchart")
var subctx = subcanvas.getContext("2d");
var myBarChart = new Chart(subctx).Bar(bardata);
Updating Bar data when Clicking Pie
// connect them both
canvas.onclick = function (evt) {
var activeSector = myPieChart.getSegmentsAtEvent(evt);
myBarChart.datasets[0].bars.forEach(function (bar, i) {
var pointTotal = 0;
data.forEach(function (point, j) {
if (activeSector.length === 0 || point.label === activeSector[0].label)
pointTotal += data[j].subData[i]
})
bar.value = pointTotal;
});
myBarChart.update();
};
Clicking outside the pie (but in the pie chart's canvas) resets the bar chart.
Fiddle - http://jsfiddle.net/0zwkjv8a/
Other answers posted already cover what I would generally advise here which is to use dc-js if you want crossfilter enabled charts out of the gate. I would have commented on this answer, but I don't have enough reputation so I'm posting this as option 'c.)' where 'a.)' is using dc-js and 'b.)' is making some modifications to an existing Chart.js chart.
Option 'c.)' is to extend the Chart.js chart type and make the child chart work like a dc-js chart. Chart.js chart types follow an inheritance hierarchy, so if you like a chart that already exists you can wrap its prototype methods with some of your own. Additionally important to this option, in the selected answer to the stack overflow question with heading 'dc.js - Listening for chart group render', it is described how the current implementation of dc-js's chartRegistry object is fairly decoupled from d3 or dc internals, so any chart implementing chartRegistry's interface can be part of a chartGroup.
I was in the position of wanting very much to use Polar Area Charts in a dataset where I was already using a chart group full of dc-js charts to crossfilter the data. I wrote an extension for Polar Area charts that could serve as an example of one way (I'm going to go ahead and say probably not the best way) to extend a chart type with dc-js like behaviors. The repo for this is at https://github.com/nsubordin81/Chart.dc.js, Licensed under an MIT License, and in case that ever goes anywhere, all of the code is copied into the example fiddle: http://jsfiddle.net/nsubordin81/3w725o3c/1/
Chart.dc.js v. 0.1.0
MIT Licensed: opensource.org/licenses/MIT
Copyright (c) 2015 Taylor Bird
(function () {
"use strict";
var root = this,
Chart = root.Chart,
dc = root.dc,
helpers = Chart.helpers,
//class for data structure that manages filters as they relate to chart segments. This should probably be generalized to chart elements of all kinds.
FilterManager = function (segmentList) {
//private member variable
var filterMap = [];
//constructor
//accepts a list of SegmentArcs that have had the extra properties added to them
for (var i = 0; i < segmentList.length; i++) {
add(segmentList[i].segmentID);
}
//private methods
function testOnAll(test) {
var testResult = true;
for (var i = 0; i < filterMap.length; i++) {
//one failure of test means testOnAll fails
if (!test(filterMap[i])) {
testResult = false;
}
}
return testResult;
}
//add a filter, pretty much just a wrapper for push
function add(segmentID) {
filterMap.push({
"segmentID": segmentID,
"active": false
});
}
//remove a filter by id, returns removed filter
function remove(segmentID) {
var removed = filterMap.find(segmentID);
filterMap = filterMap.filter(function (elem) {
return elem.segmentID !== segmentID;
});
return removed;
}
//return this segment if it is filtered
function find(segmentID) {
for (var i = 0; i < filterMap.length; i++) {
if (filterMap[i].segmentID === segmentID) {
return filterMap[i];
}
}
return -1;
}
//public methods
return {
//tell me if the filter for this segment is active
isActive: function (segmentID) {
var filter = find(segmentID);
if (filter === -1) {
console.error("something went wrong, the filter for this segment does not exist");
}
return filter.active;
},
//for the given segment, activate or deactivate its filter. return whether the filter is on or off.
flip: function (segmentID) {
var filter = find(segmentID);
if (filter === -1) {
console.error("something went wrong, the filter for this segment does not exist");
}
filter.active ? filter.active = false : filter.active = true;
return filter.active;
},
//if all filters are on, we want to be able to quickly deactivate them all
turnAllOff: function () {
for (var i = 0; i < filterMap.length; i++) {
filterMap[i].active = false;
}
},
//tell me if all of the filters are off
allOff: function () {
return testOnAll(function (elem) {
return !elem.active;
});
},
//tell me if all the filters are on
allOn: function () {
return testOnAll(function (elem) {
return elem.active;
});
}
}
};
//utility function, Takes an array that has some property as its key
//and forms a javascript object with the keys as properties so we can get O(1) access
function createKeyMap(arr, propName) {
var keyMap = {}
for (var i = 0; i < arr.length; i++) {
keyMap[arr[i][propName]] = arr[i];
}
return keyMap;
}
Chart.types.PolarArea.extend({
name: "PolarAreaXF",
//this will have to be a member
dimension: undefined,
colorTypes: {
"NORMAL": 0,
"HIGHLIGHT": 1,
"FILTER": 2,
"FILTER_HIGHLIGHT": 3
},
chartGroup: undefined,
filters: undefined,
originalDataKeys: undefined,
initialize: function (data) {
//--PRE--
var that = this;
//Polar Area initialize method is expecting (data, options) in arguments,
//but we pass in an array of components to merge. Let's clean this up.
var argsArray = Array.prototype.slice.call(arguments);
//remove the first element of arguments which is our array, then we do a bunch of Chartjs converison on it . . .
argsArray.splice(0, 1);
//TODO - check if data is an array, if not, put a message in a console explaining how you are supposed to send data in an array
this.dimension = data.dimension;
data.chartGroup ? this.chartGroup = data.chartGroup : this.chartGroup = 0;
//short but magical line. Now we are linked with all dc charts in this group!
dc.registerChart(this, this.chartGroup);
var data = this.setupChartData(data.colors, data.highlights, data.labels);
//... and push the result in its place.
argsArray.unshift(data);
//originalDataArray -- this is used as a reference to the original state of the chart, since segments can come and go,
//we use this to track what a segment's original colors were when adding it back in. This would mess up adding a truly new segment, but who
//is gonna do that? Assumption here is dimensions start with so many groups and that is it.
this.originalDataKeys = createKeyMap(data, "key");
//parent's initialize
Chart.types.PolarArea.prototype.initialize.apply(this, argsArray);
//--modify SegmentArcs--
//assign colors and ids to all existing segment arcs
var mySegments = this.segments;
for (var i = 0; i < mySegments.length; i++) {
mySegments[i].colorList = [undefined, undefined, "#777", "#aaa"];
mySegments[i].colorList[this.colorTypes.NORMAL] = mySegments[i].fillColor;
mySegments[i].colorList[this.colorTypes.HIGHLIGHT] = mySegments[i].highlight;
mySegments[i].segmentID = i;
mySegments[i].key = data[i].key;
}
//add methods to SegmentArc objects that will color them one way or the other depending on their filter
this.SegmentArc.prototype.setIncluded = function (include) {
if (include) {
this.fillColor = this.colorList[that.colorTypes.NORMAL];
this.highlight = this.colorList[that.colorTypes.HIGHLIGHT];
} else {
this.fillColor = this.colorList[that.colorTypes.FILTER];
this.highlight = this.colorList[that.colorTypes.FILTER_HIGHLIGHT];
}
}
//--initialize filters--
this.filters = new FilterManager(this.segments);
//handle clicks on segments as filter events, do the styling and crossfilter changes at the Chart level in the filter method.
helpers.bindEvents(this, ["mousedown"], function (evt) {
var activeSegment = Chart.types.PolarArea.prototype.getSegmentsAtEvent.apply(this, [evt])[0];
this.handleFilter(activeSegment);
});
},
//convert crossfilter dimension into chart.js Polar Area data object array
setupChartData: function (colors, highlights, labels) {
var chartJSible = [];
//probably need checks here to make sure client actually passed in a crossfilter dimension
var grouped = this.dimension.group().reduceCount().top(Infinity);
//probably need checks here to either fail if the arrays aren't all long enough or have some way to add random colors/highlights if they are shorter.
for (var i = 0; i < grouped.length; i++) {
var dataObject = {
value: grouped[i].value,
key: grouped[i].key,
color: colors[i],
highlight: highlights[i],
label: labels ? (labels[i] ? labels[i] : grouped[i].key) : grouped[i].key
};
chartJSible.push(dataObject);
}
return chartJSible;
},
//figure out what changed between Chart.js' internally maintained data object array and crossfilter's dimension data. use the saved information
//about what colors and highlight a key has to rebuild the segmentArc list 'segments'. can't trash the old, it might mess up the animations.
redraw: function () {
var grouped = this.dimension.group().reduceCount().top(Infinity);
var currentSegmentKeys = createKeyMap(this.segments, "key");
var crossfilterGroupKeys = createKeyMap(grouped, "key");
//loop through the segment list, if the segment for a group is already there, update the value, if it is not there, add it back using the
//original data as a guide for what it's color and highlight color should be. if there are segments in the existing list
var length = Math.max(this.segments.length, grouped.length);
//going through both lists, whichever is longer
for (var i = 0; i < length; i++) {
var sList = this.segments;
var gList = grouped;
//only do this part if we still have items in the new filtered list
if (gList[i]) {
//we already have a segment for this crossfilter group, just get that segment and update its value
if (currentSegmentKeys[gList[i].key]) {
currentSegmentKeys[gList[i].key].value = gList[i].value;
} else {
//the chart doesn't have the crossfilter group item, add a new segment with the right colors and values from original data
var theSegment = this.originalDataKeys[gList[i].key];
this.addData(theSegment, 0, true);
}
}
//only do this part if we still have items in the current chart segment list
if (sList[i]) {
//we don't have this segment in the new crossfilter group, remove it from the chart
if (!crossfilterGroupKeys[sList[i].key]) {
this.removeData(i);
}
}
}
this.update();
},
filterAll: function () {
this.dimension.filterAll();
this.filters.turnAllOff();
this.colorMeIn();
this.redraw();
},
handleFilter: function (clicked) {
//after we have all of the filters figured out, change the colors to reflect what they should be and update the chart
this.filters.flip(clicked.segmentID);
this.colorMeIn();
if (this.filters.allOn()) {
this.dimension = this.dimension.filterAll();
dc.redrawAll(this.chartGroup);
this.filters.turnAllOff();
}
dc.redrawAll(this.chartGroup);
},
colorMeIn() {
var activeFilters = [];
var segments = this.segments;
for (var i = 0; i < segments.length; i++) {
var segment = segments[i];
if (this.filters.isActive(segment.segmentID) || this.filters.allOff()) {
segment.setIncluded(true);
activeFilters.push(segment.key);
} else {
segment.setIncluded(false);
}
}
this.dimension = this.dimension.filterFunction(function (d) {
for (var i = 0; i < activeFilters.length; i++) {
if (d === activeFilters[i]) {
return true;
}
}
return false;
});
}
})
}).call(this);
Use dc.js: https://dc-js.github.io/dc.js/
It has exactly the functionality asked for.

leaflet: how to show draw control in custom (own) div?

I'm trying to put a Control into an existing div but I don't really know where or how I can force the map.addControl method to show the control (it is a draw control by the way) within an already existing div on the map. I'm using the leaflet draw plugin by the way.
My html looks something like this:
<div class="tooldiv" ng-controller="ClientState">
...
</div>
tooldiv is where the control should be placed.
This is my leaflet config:
var drawnItems = new L.FeatureGroup();
map.addLayer(drawnItems);
var drawControl = new L.Control.Draw({
position: 'topleft',
draw: {
polyline: false,
polygon: {
title: 'Draw a sexy polygon!',
allowIntersection: false,
drawError: {
color: '#b00b00',
timeout: 1000
},
shapeOptions: {
color: '#bada55'
},
showArea: true
},
circle: false,
rectangle: false,
marker: false
},
edit: false
});
// Add and remove DrawControl menu when layer is selected/unselected
this.toggle_layer_edit = function(edit_polygon) {
if (edit_polygon === true) {
if (draw_control_check === null) {
draw_control_check = map.addControl(drawControl);
}
} else {
if (draw_control_check !== null) {
map.removeControl(drawControl);
draw_control_check = null;
}
}
}
While searching for an answer I got the idea that it might not even be possible?
I think you should try overwriting the draw control's onAdd method.
Here's some untested pseudo code (I'm not sure if the assignment & call of the original onAdd method do work like this):
var drawControlOnAdd = drawControl.onAdd;
drawControl.onAdd = function (map) {
var $toolDiv = angular.element('.tooldiv');
var originalDiv = drawControlOnAdd(map);
$toolDiv.html(originalDiv);
return $toolDiv[0];
}
HTH

How to toggle multiple boolean divs

I have a grid of images and I'd like to toggle an animation when each image is clicked. This function sets x = true for all of the images, how do I ask it to just effect the img which has been clicked?
var x = false
$('img').click(function(){
if (x == false) {
$(this).animate({border: '5px'});
x = true;
}
else {
$(this).animate({border: '0px'});
x = false;
}
});
Thank you .
Here is the fiddle for the above : http://jsfiddle.net/m79fB/
Jquery methods to addClass , removeClass and hasClass can be used here to easily solve the problem ,
CSS :
.add-border {
border:5px solid red;
}
Javascript/jquery :
$('img').click(function() {
var borderClass = $(this).hasClass('add-border') ; // returns true or false
if(!borderClass)
$(this).addClass('add-border');
else
$(this).removeClass('add-border');
});
Here is the fiddle http://jsfiddle.net/hearsid/489hW/