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Create dynamically updating graph with Angular 6 on API calls

I am trying to implement angular chart.js graph dynamically update based on api calls
Currently i have implemented it to be a static chart, as follows.
service
import { Injectable } from '#angular/core';
import {HttpClient,HttpHeaders} from '#angular/common/http';
import 'rxjs/add/operator/map';
#Injectable({
providedIn: 'root'
})
export class WeatherService {
constructor(private _http:HttpClient) {
}
dailyForecast(){
return this._http.get("http://samples.openweathermap.org/data/2.5/history/city?q=Warren,OH&appid=b6907d289e10d714a6e88b30761fae22")
.map(result => result);
}
}
component
ngOnInit(){
this._weather.dailyForecast()
.subscribe(res=>{
let temp_max = res['list'].map(res=> res.main.temp_max)
let temp_min = res['list'].map(res=> res.main.temp_min)
let alldates = res['list'].map(res=> res.dt)
let weatherDates = []
alldates.forEach((res) => {
let jsdate = new Date(res*1000)
weatherDates.push(jsdate.toLocaleTimeString('en',{year:'numeric',month:'short',day:'numeric'}))
});
this.chart = new Chart('canvas',{
type: 'line',
data : {
labels:weatherDates,
datasets: [
{
data:temp_max,
borderColor: '#3cba9f',
fill:false
},
{
data:temp_min,
borderColor: '#ffcc00',
fill:false
}
]
},
options:{
legend:{
display:false
},
scales: {
xAxes: [{
display:true
}],
yAxes: [{
display:true
}]
}
}
});
})
}
But i wanted it to make , look like IQ Option like graph(To update that graph component only) like this,
dynamically updating graph
what are the options that i can take? and how can i implement those?

You can do it through polling service, where you make each request after a specific interval,
You can make a request based on the interval using $interval,
Observable.interval(3000)
or
let intervalId = setInterval(() => {
this.updateData();
}, 3000);

Ag-Grid cellRender with Button Click

I am using an angular 5 with ag-grid data table
i cant able to trigger a click event from cell using cellRenderer here how am using my ag-grid --> colDefs
this.columnDefs = [
{headerName: '#', rowDrag: true, width: 75},
{headerName: 'One', field: 'fieldName',
cellRenderer : function(params){
return '<div><button (click)="drop()">Click</button></div>'
}
}
];
drop() {
alert("BUTTON CLICKEFD")
}
if am using onClick="alert("123")" --> it works,
but i cant able to use onClick="drop()" it throws drop of undefined,
i tried this too inside of cellRenderer --> params = params.$scope.drop = this.drop;
if am using gridOptions with angularCompileRows : true it throws an error Cannot read property '$apply' of undefined.
Do i need to install ag-grid enterprise ??

You can use cellRenderer with a button component.
If you want to get the click event on the button from the user on the table, just declare the callback function you want to cellRendererParams.
// app.component.ts
columnDefs = [
{
headerName: 'Button Col 1',
cellRenderer: 'buttonRenderer',
cellRendererParams: {
onClick: this.onBtnClick.bind(this),
label: 'Click'
}
},
...
]
The above code is just a small part, check out full example on Stackblitz

Angular.
Here we create the button cell renderer as an Angular component that implements the ICellRendererAngularComp interface. Access to the params object can be found on the agInit hook.
// app/button-cell-renderer.component.ts
#Component({
selector: 'btn-cell-renderer',
template: `
<button (click)="btnClickedHandler($event)">Click me!</button>
`,
})
export class BtnCellRenderer implements ICellRendererAngularComp, OnDestroy {
private params: any;
agInit(params: any): void {
this.params = params;
}
btnClickedHandler() {
this.params.clicked(this.params.value);
}
ngOnDestroy() {
// no need to remove the button click handler as angular does this under the hood
}
}
The renderer is registered to ag-Grid via gridOptions.frameworkComponents. Note that we’re passing the button click handler dynamically to our renderer via cellRendererParams - allowing for a more flexible and reusable renderer.
// app/app.component.ts
this.columnDefs = [
{
field: 'athlete',
cellRenderer: 'btnCellRenderer',
cellRendererParams: {
clicked: function(field: any) {
alert(`${field} was clicked`);
}
},
minWidth: 150,
}
// [...]
];
this.frameworkComponents = {
btnCellRenderer: BtnCellRenderer
};
It is also necessary to pass our renderer to our #NgModule decorator to allow for dependency injection.
// app/app.modules.ts
#NgModule({
imports: [
BrowserModule,
FormsModule,
HttpClientModule,
AgGridModule.withComponents([BtnCellRenderer]),
],
declarations: [AppComponent, BtnCellRenderer],
bootstrap: [AppComponent],
})
See demo.
Learn more about Angular Cell Renderer.
Vanilla JavaScript.
A DOM element is created in the init method, which is then returned in the getGui method. The optional destroy hook has also included to do some cleanup (removing the click listener from our component).
// btn-cell-renderer.js
function BtnCellRenderer() {}
BtnCellRenderer.prototype.init = function(params) {
this.params = params;
this.eGui = document.createElement('button');
this.eGui.innerHTML = 'Click me!';
this.btnClickedHandler = this.btnClickedHandler.bind(this);
this.eGui.addEventListener('click', this.btnClickedHandler);
}
BtnCellRenderer.prototype.getGui = function() {
return this.eGui;
}
BtnCellRenderer.prototype.destroy = function() {
this.eGui.removeEventListener('click', this.btnClickedHandler);
}
BtnCellRenderer.prototype.btnClickedHandler = function(event) {
this.params.clicked(this.params.value);
}
The renderer is registered to ag-Grid in gridOptions.components and is used on the athlete column. Note that we’re passing the button click handler dynamically to our renderer via cellRendererParams - this makes for a more flexible and reusable renderer.
// main.js
var gridOptions = {
columnDefs: [
{
field: 'athlete',
cellRenderer: 'btnCellRenderer',
cellRendererParams: {
clicked: function(field) {
alert(`${field} was clicked`);
}
},
minWidth: 150
},
// [...]
components: {
btnCellRenderer: BtnCellRenderer
}
};
See demo.
Learn more about JavaScript Cell Renderers.
React.
Here our button cell renderer is constructed as a React component. The only thing to take note of here is that cell params will be available on the component via props.
// BtnCellRenderer.jsx
class BtnCellRenderer extends Component {
constructor(props) {
super(props);
this.btnClickedHandler = this.btnClickedHandler.bind(this);
}
btnClickedHandler() {
this.props.clicked(this.props.value);
}
render() {
return (
<button onClick={this.btnClickedHandler}>Click Me!</button>
)
}
}
The renderer is registered to ag-Grid via gridOptions.frameworkComponents. The button click handler is passed to our renderer at run time via cellRendererParams - allowing for a more flexible and reusable renderer.
// index.jsx
columnDefs: [
{
field: 'athlete',
cellRenderer: 'btnCellRenderer',
cellRendererParams: {
clicked: function(field) {
alert(`${field} was clicked`);
},
},
// [...]
}
];
frameworkComponents: {
btnCellRenderer: BtnCellRenderer,
}
See demo.
Learn more about React Cell Renderers.
Vue.js.
Configuring the renderer in Vue.js is simple:
// btn-cell-renderer.js
export default Vue.extend({
template: `
<span>
<button #click="btnClickedHandler()">Click me!</button>
</span>
`,
methods: {
btnClickedHandler() {
this.params.clicked(this.params.value);
}
},
});
As with the other frameworks, the renderer is registered to ag-Grid via gridOptions.frameworkComponents and the button click handler is passed to our renderer at run time via cellRendererParams - allowing for a more flexible and reusable renderer.
// main.js
this.columnDefs = [
{
field: 'athlete',
cellRenderer: 'btnCellRenderer',
cellRendererParams: {
clicked: function(field) {
alert(`${field} was clicked`);
}
},
// [...]
],
this.frameworkComponents = {
btnCellRenderer: BtnCellRenderer
}
See demo.
Learn more about Vue.js Cell Renderers.
Read the full blog post on our website or check out our documentation for a great variety of scenarios you can implement with ag-Grid.
Ahmed Gadir | Developer # ag-Grid

To expand on the answer from #T4professor, I will post some code to also have a dynamic label on that Click button.
// Author: T4professor
import { Component, OnInit, AfterContentInit } from '#angular/core';
import { ICellRendererAngularComp } from 'ag-grid-angular';
#Component({
selector: 'app-button-renderer',
template: `
<button class="{{btnClass}}" type="button" (click)="onClick($event)">{{label}}</button>
`
})
export class ButtonRendererComponent implements ICellRendererAngularComp {
//https://stackblitz.com/edit/angular-ag-grid-button-renderer?file=src%2Fapp%2Fapp.component.ts
params: any;
label: string;
getLabelFunction: any;
btnClass: string;
agInit(params: any): void {
this.params = params;
this.label = this.params.label || null;
this.btnClass = this.params.btnClass || 'btn btn-primary';
this.getLabelFunction = this.params.getLabelFunction;
if(this.getLabelFunction && this.getLabelFunction instanceof Function)
{
console.log(this.params);
this.label = this.getLabelFunction(params.data);
}
}
refresh(params?: any): boolean {
return true;
}
onClick($event) {
if (this.params.onClick instanceof Function) {
// put anything into params u want pass into parents component
const params = {
event: $event,
rowData: this.params.node.data
// ...something
}
this.params.onClick(params);
}
}
}
Then, in the component with the grid you do the following:
columnDefs = [
{
headerName: 'Publish',
cellRenderer: 'buttonRenderer',
cellRendererParams: {
onClick: this.onRowPublishBtnClick.bind(this),
label: 'Publish',
getLabelFunction: this.getLabel.bind(this),
btnClass: 'btn btn-primary btn-sm'
}
}
]
onRowPublishBtnClick(e) {
this.rowDataClicked = e.rowData;
}
getLabel(rowData)
{
console.log(rowData);
if(rowData && rowData.hasIndicator)
return 'Republish';
else return 'Publish';
}

You have this issue because you invoke drop() incorrectly you should change it to this.drop()
In general you should use cellRenderer property with simple logic. More convenient way for complex logic renderer you should use cellRendererFramework: YourCustomRendererAngularComponent.
columnDefs = [
{
headerName: 'Col Name',
cellRendererFramwork: MyAngularRendererComponent, // RendererComponent suffix it is naming convention
cellRendererParams: {
onClick: (params) => this.click(params);
}
},
...
]
MyAngularRendererComponent should implements AgRendererComponent.
Also in angular module where you use MyAngualrRendererComponent don`t forget put this code:
#NgModule({
imports: [
AgGridModule.withCompoennts([
MyAngualrRendererComponent
])
]
})

I was looking for a solution to this but for multiple buttons in the same column. I couldn't find an answer anywhere so I wrote up this Plain Javascript solution. I hope it helps other people looking for the solution I was looking for. Also open to suggestions on how to make the javascript less hacky.
// multi-btn-cell-renderer.js
function multiBtnCellRenderer() {}
multiBtnCellRenderer.prototype.init = function(params) {
var self = this;
self.params = params;
self.num_buttons = parseInt(this.params.num_buttons);
self.btnClickedHandlers = {};
let outerDiv = document.createElement('div')
for(let i = 0; i < self.num_buttons; i++) {
let button = document.createElement('button');
button.innerHTML = self.params.button_html[i];
outerDiv.appendChild(button);
self.btnClickedHandlers[i] = function(event) {
self.params.clicked[i](self.params.get_data_id());
}.bind(i, self);
button.addEventListener('click', self.btnClickedHandlers[i]);
}
self.eGui = outerDiv;
};
multiBtnCellRenderer.prototype.getGui = function() {
return this.eGui;
};
multiBtnCellRenderer.prototype.destroy = function() {
for(let i = 0; i < this.num_buttons; i++) {
this.eGui.removeEventListener('click', this.btnClickedHandlers[i]);
}
};
// main.js
var columnDefs = [
{
headerName: "Action",
maxWidth: 60,
filter: false,
floatingFilter: false,
suppressMenu: true,
sortable: false,
cellRenderer: multiBtnCellRenderer,
cellRendererParams: {
num_buttons: 2,
button_html: ["<i class='fa fa-pencil'></i>","<i class='fa fa-trash'></i>"],
get_data_id: function() {
return this.data.id;
},
clicked: {
0: function(data_id) {
$.get(`/employee/${data_id}/edit`)
},
1: function(data_id) {
$.delete(`/employee/${data_id}`)
}
}
}
}
]

Angular create Dynamic Component recursively

I am trying to build a dynamic component based on a Config. The component would read the config recursively and create the component. It is found that the method ngAfterViewInit() would only be called twice.
#Component({
selector: "dynamic-container-component",
template: `
<div #container
draggable="true"
(dragstart)="dragstart($event)"
(drop)="drop($event)"
(dragover)="dragover($event)"
style="border: 1px solid; min-height: 30px"></div>
`
})
export default class DynamicContainerComponent {
#Input()
dynamicConfig: DynamicConfig;
#ViewChild("container", {read: ElementRef})
private elementRef: ElementRef;
private isContainer: boolean;
private componentRef: ComponentRef<any>;
private componentRefs: ComponentRef<any>[] = [];
constructor(
private componentFactoryResolver: ComponentFactoryResolver,
private injector: Injector,
private viewContainer: ViewContainerRef,
private render: Renderer2
){
console.log("running");
}
ngAfterViewInit(){
if (this.dynamicConfig){
console.log(this.dynamicConfig)
if (this.dynamicConfig.getType() == ComponentType.INPUT){
this.isContainer = false;
let componetFactory: ComponentFactory<InputComponent> =
this.componentFactoryResolver.resolveComponentFactory(InputComponent);
this.componentRef = this.viewContainer.createComponent(componetFactory);
this.render.appendChild(this.elementRef.nativeElement, this.componentRef.location.nativeElement);
}else {
this.isContainer = true;
let items: DynamicConfig[] = this.dynamicConfig.getItems();
if (items){
for (var i=0; i<items.length; i++){
let item: DynamicConfig = items[i];
let componetFactory: ComponentFactory<DynamicContainerComponent> =
this.componentFactoryResolver.resolveComponentFactory(DynamicContainerComponent);
let componentRef: ComponentRef<DynamicContainerComponent> =
this.viewContainer.createComponent(componetFactory);
componentRef.instance.dynamicConfig = item;
this.componentRefs.push(componentRef);
this.render.appendChild(this.elementRef.nativeElement, componentRef.location.nativeElement);
}
}
}
}else {
console.log("config does not exist");
}
}
dragstart(event){
debugger;
}
drop(event){
debugger;
}
dragover(event){
debugger;
event.preventDefault();
}
}
The Component would be created by other component by the following code. If The Dynamic Component would create another Dynamic Component by componentFactoryResolver.
var configJson = {
type: ComponentType.CONTAINER,
items: [
{
type: ComponentType.CONTAINER,
items: [{
type: ComponentType.CONTAINER,
items: [{
type: ComponentType.CONTAINER,
items: [{
type: ComponentType.INPUT
}]
}]
}]
}
]
}
this.config = new DynamicConfig();
this.config.assign(configJson);
console.log(this.config);
Update
I found a similar issue in github: https://github.com/angular/angular/issues/10762
I have done something suggested by other people. but I think it is just a dirty fix.
ngAfterViewInit(){
setTimeout(function(){
if (this.dynamicConfig){
console.log(this.dynamicConfig)
if (this.dynamicConfig.getType() == ComponentType.INPUT){
this.isContainer = false;
let componetFactory: ComponentFactory<InputComponent> =
this.componentFactoryResolver.resolveComponentFactory(InputComponent);
this.componentRef = this.viewContainer.createComponent(componetFactory);
this.render.appendChild(this.elementRef.nativeElement, this.componentRef.location.nativeElement);
}else {
this.isContainer = true;
let items: DynamicConfig[] = this.dynamicConfig.getItems();
if (items){
for (var i=0; i<items.length; i++){
let item: DynamicConfig = items[i];
let componetFactory: ComponentFactory<DynamicContainerComponent> =
this.componentFactoryResolver.resolveComponentFactory(DynamicContainerComponent);
let componentRef: ComponentRef<DynamicContainerComponent> =
this.viewContainer.createComponent(componetFactory);
componentRef.instance.dynamicConfig = item;
this.componentRefs.push(componentRef);
this.render.appendChild(this.elementRef.nativeElement, componentRef.location.nativeElement);
}
}
}
}else {
console.log("config does not exist");
}
}.bind(this))
}

By the time you create your dynamic component angular has almost finished change detection cycle.
This way you can either run:
componentRef.changeDetectorRef.detectChanges()
Note: setTimeout has similar effect but fires change detection cycle on the whole app
or rename lifecycle hook to ngOnInit
Also you're passing wrong input to dynamic component:
let item: DynamicConfig = items[i];
^^^^^^^^^^^^^
but it is not DynamicConfig instance but rather plain object
...
componentRef.instance.dynamicConfig = item;
it should be:
let item: any = items[i];
const config = new DynamicConfig();
config.assign(item);
componentRef.instance.dynamicConfig = config;
Ng-run Example

Update/re-render Charts.js in Angular 4

Trying to re-render charts every time when i have some change in API, here is the method:
ngOnChanges(changes: SimpleChanges) {
const data = changes['data'].currentValue;
this.draw(data);
}
and draw function
private draw(charts) {
this.charts = charts.map((chart, i) => {
this.options.title.text = chart.title;
const options = {
type: 'bar',
data: chart,
options: this.options
};
return new Chart(`chart${i}`, options);
});
this.charts.forEach(chart => {
chart.update();
});
}
you can see that i try to update/re-render charts in draw function. In console log i can see that chart object was updated with new data, but they just disappear from page. What's wrong in my update method?

I found a solution, i know it's a hack, but for the moment it's ok )))
So, basically i check if charts already exist in DOM, and if exist remove them and create new canvas elements.
private removeAction() {
const block = document.querySelector('#chartsBlock');
//remove
while (block.firstChild) {
block.removeChild(block.firstChild);
}
// create
this.charts.forEach((chart, i) => {
let canvas = document.createElement('canvas');
canvas.id = `chart${i}`;
block.appendChild(canvas);
});
}

You could try using ChangeDetectorRef:
import { ChangeDetectorRef } from '#angular/core';
constructor(private detector: ChangeDetectorRef) {}
ngOnChanges(changes: SimpleChanges) {
const data = changes['data'].currentValue;
this.draw(data);
this.detector.detectChanges()
// if detectChanges() doesn't work, try markForCheck()
}

Vuejs chart not displaying after page reload

I created a chart using vue-chartjs which renders some data from a JSON endpoint.
The problem is that the chart is not rendered after the page reloads.
This is the HTML that calls the chart component.
<absentee-chart v-if="isLoaded==true" :chart-data="this.chartData"></absentee-chart>
This is the absenteeChart.js file that renders the chart data.
import { Bar, mixins } from 'vue-chartjs'
export default {
extends: Bar,
mixins: [mixins.reactiveProp],
data: () => ({
options: {
responsive: true,
maintainAspectRatio: false
}
}),
mounted () {
this.renderChart(this.chartData, this.options)
}
}
And finally my .vue file.
created () {
axios
.get(constants.baseURL + "absentee-reports/graph", auth.getAuthHeader())
.then(response => {
this.graph = response.data;
var males = {
data: []
};
var females = {
data: []
};
var len = this.graph.length;
for (var i = 0; i < len; i++) {
if (this.graph[i].year == "2009") {
this.labels.push(this.graph[i].month);
//push to males
this.datasets[0].data.push(this.graph[i].males);
//push to females
this.datasets[1].data.push(this.graph[i].females);
}
}
this.isLoaded = true;
this.chartData.labels = this.labels;
this.chartData.datasets = this.datasets;
});
}
UPDATE: The chart appears after I resize my browser page.

The solution to this was separating all my chart logic from my .vue file and omitting the use of mixins and reactiveProp. From what I could tell, this issue lies deep within the core of chart.js
Hope this helps somebody.
Cheers :)