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.
}
I have a knockout page where I am formatting the input with regex. It makes the input field to a MM/dd/yyyy format. So if a user inputs "1111" it will change the input vbox to show "01/01/2011" or for "01111" it will show "01/01/2011".
The problem I am facing is that my observable only returning the keystroke entered by user and not the fully formatted item. For example , if user is entering "1111" I get back "1111" instead of the "01/01/2011"
Here is the Html segment
<input id="inpEventDt" placeholder="MM/DD/YYYY" class="input-small" data-date-blur="true" data-regex="^((\d{0,2})|(\d{1,2}/?\d{0,2})|(\d{1,2}/?\d{1,2}/?\d{0,4}))$"
type="text" data-bind="textInput: dateofevent"/>
And this is how I have the knockout binding
var ViewModel = function (eventdt ) {
var self = this;
self.dateofevent = ko.observable(eventdt);
}
viewModel = new ViewModel("");
ko.applyBindings(viewModel);
Trying to figure out what I am doing wrong.
I would not try to format the text input while the user is typing, because it makes a hard to understand user interface and non intuitive typing experience.
In addition, it's more complicated, because while typing, the input is likely invalid.
Try instead to format your input on some event (blur for example), while validating it on keystroke:
var viewModel = function() {
var self = this;
var regex = /^(\d{1,2})\/(\d{1,2})\/(\d{4})$/;
this.isValid = ko.observable(false);
this.date = ko.observable("");
this.format = function() {
self.validate(self.date());
// TODO: something else
}
this.validate = function(newVal) {
var matches = newVal.match(regex);
if (!matches || matches.length != 4) {
self.isValid(false);
} else {
self.isValid(true);
}
};
this.date.subscribe(function(newVal) {
self.validate(newVal);
});
this.style = ko.computed(function() {
return self.isValid() ? "valid" : "invalid";
}, this);
};
var vm = new viewModel();
ko.applyBindings(vm);
.invalid {
border: 1px solid red;
}
.valid {
border: 1px solid green;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<input id="inpEventDt" placeholder="MM/DD/YYYY" class="input-small" data-date-blur="true" type="text" data-bind="textInput: date, event: { blur: format }, css: style" />
<div data-bind="visible: isValid">OK</div>
You should try using a read/write computed for this. Check out the example 3 in the knockout documentation for computed observables.
Also, here is a jsfiddle using moment.js to help with date formatting.
var ViewModel = function (eventdt ) {
var self = this;
self.dateofevent = ko.observable(eventdt);
self.formattedDate = ko.pureComputed({
read: function () {
return moment(self.dateofevent()).format("MM/DD/YYYY");
},
write: function (value) {
self.dateofevent(moment(value).toDate()); // Write to underlying storage
}
});
}
viewModel = new ViewModel(new Date("03/25/2015"));
ko.applyBindings(viewModel);
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.
I want to refresh a dojo grid in my web page. I tried .refresh which is given in dojotoolkit.org without success. is there any other convenient way to do refreshing? Thanks in advance.
Maybe this helps. This is the way i refresh my Grid:
if(!registry.byId("GraphGrid")){
var grid = new EnhancedGrid({
id: 'GraphGrid',
store: GraphicStore,
query: { ident: "*" },
structure: layout,
rowSelector: '20px',
plugins: {
indirectSelection: {
headerSelector:true,
width:"40px",
styles:"text-align: center;"
}}
},"GridGraphicInMap");
/*Call startup() to render the grid*/
grid.startup();
dojo.connect(grid, "onRowClick", grid, function(evt){
var idx = evt.rowIndex,
item = this.getItem(idx);
// get a value out of the item
var value = this.store.getValue(item, "geom");
highlightGeometry(value,true);
// do something with the value.
});
}
else {
registry.byId("GraphGrid").setStore(GraphicStore);
}
When i first call my function the grid is generated. Evrytime i call the function later only the store is refreshed.
Regards, Miriam
I have a kendo Treeview bound to a remote hierarchical datasource(JSON file).
I want to add sprites next to each one of the nodes according to what the node is.If the node doesn't have children then I want it to have the "file" sprite,if the node has children I want it to have the "folder" sprite.(The sprites are provided from kendo,the ones that are on the demos)
I'm a bit confused with the way templates work,can I alter the sprite for each of the nodes dynamically with the template?Any good example and a bit of explanation to get me going would help a lot.
Thx
In the following code what I do is define a template that checks if the node being rendered has items (subnodes) or not. If it has, it displays an icon from default sprite file (k-i-plus) otherwise it shows a different icon (k-i-refresh).
function loadMore() {
var uuid = $(this).data("uid");
var node = tree.findByUid(uuid);
tree.insertBefore(content, node);
tree.remove(node);
tree.expand(".k-item");
addLoadMore(".k-i-refresh");
}
function addLoadMore(clss) {
$(clss, tree.element).closest(".k-item").on("click", loadMore);
}
var content = [
{
text :"node1",
items:[
{ text:"node1.1" },
{ text:"node1.2" },
{ text :"node1.3",
items:[
{ text:"node1.3.1" },
{ text:"node1.3.2" },
{ text:"node1.3.3" },
{ text:"node1.3.4" }
] },
{ text:"node1.4" }
]
}
];
var tree = $("#tree").kendoTreeView({
dataSource:content,
template :"<span class='k-icon #= item.items ? 'k-i-plus' : 'k-i-refresh' #'></span>#= item.text #"
}).data("kendoTreeView");
tree.expand(".k-item");
addLoadMore(".k-i-refresh");
What you would need to do if replace k-i-plus by the CSS class name that defines the folder and change k-i-refresh by the CSS class name for the file.
If you need information on writing template there is a pretty good documentation in here.
I know I am 3+ years late for this. But in case anyone run into this same question. Here is how I achieved it:
schema: {
model: {
children: "folder",
hasChildren: function (node) {
var hasChildren = (node.folder && node.folder.length > 0);
if (hasChildren === true) {
node.spriteCssClass = "folder";
} else {
node.spriteCssClass = "html";
}
return hasChildren;
}
}
}