This is a simplified version of my problem, as my model is much bigger.
I'm generating a drop-down from a set of objects, and using the object.Name property of each to fill the select.
<md-select [(ngModel)]="selectedDetachment" placeholder="Select a detachment">
<md-option *ngFor="let option of detachmentOptions" [value]="option">
{{option.Name}}
</md-option>
</md-select>
the detachmentOptions object is a generated set of 3 objects, all of which extend Detachment,
private detachmentOptions: Detachment[];
this.detachmentOptions = [
new DetachmentPatrol(),
new DetachmentBattalion(),
new DetachmentBrigade()
];
I want to add a detachment to my main army, based on the select, which uses the following function
addDetachment() {
if(this.selectedDetachment) {
this.army.Detachments.push(this.selectedDetachment.constructor());
// this.makeDetachmentOptions();
}
}
My problem is that this uses the orignal, as JS inherantly passes by reference. No matter how many copies of DetachmentBattaliion I add, they all contain the same contents, as they are each references to the original created in the constructor.
I need to be able to create a brand-new blank object of the type selected, and I'm completely blanking on how to do this.
Object.prototype() gets the prototype, so I can't get the type, and I can't find a way to use typeof to genearate a new copy of the object.
It does not need to copy the object wholesale, I just need a method of creating the original type, without tying them together by reference.
You can use lodash's cloneDeep. It creates a new object instance instead of referencing the same object.
import { cloneDeep } from 'lodash';
...
export class ... {
private detachmentOptions: Detachment[];
...
addDetachment() {
if(this.selectedDetachment) {
const selectedDetachment = cloneDeep(this.selectedDetachment);
this.army.Detachments.push(selectedDetachment.constructor());
// this.makeDetachmentOptions();
}
}
}
you may try below,
addDetachment() {
if(this.selectedDetachment) {
const prototype = Object.getPrototypeOf(this.selectedDetachment);
const instance = Object.create(prototype);
this.army.Detachments.push(instance);
console.log(instance);
console.log(this.army);
}
}
Check this Plunker!!
Related
So basically I have a modal component with an input field that tells it which modal should be opened (coz I didn't want to make a component for each modal):
#Input() type!:string
ngOnChanges(changes: SimpleChanges): void {
this.type = changes["type"].currentValue;
this.openModal();
}
that field is binded to one in the app component:
modalType = "auth";
HTML:
<app-modal [type] = modalType></app-modal>
In the beginning it's got the type "auth" (to login or register), but when I click on an icon I want to open a different modal, I do it like so:
<h1 id="options-route"
(click) ="modalType = 'settings'"
>⚙</h1>
but this only works the first time, when modalType already has the value "settings" the event doesn't trigger even though the value has technically changed
I think the problem is that it's the same value because i tried putting a button that does the exact same thing but with the value "auth" again and with that it was clear that the settings button only worked when tha last modal opened was auth and viceversa
any ideas? I want to be able to open the settings modal more than once consecutively possibly keeping onChange because ngDoCheck gets called a whole lot of times and it slows down the app
You need to include the changeDetectorRef, in order to continue in this way.
More about it https://angular.io/api/core/ChangeDetectorRef
Although, a better and a faster alternative is the use of a behavior Subject.
All you have to do is create a service that makes use of a behavior subject to cycle through each and every value exposed and then retrieve that value in as many components as you want. To do that just check for data changes in the ngOnInit of target component.
You may modify this for implementation,
private headerData = new BehaviorSubject(new HeaderData());
headerDataCurrent = this.headerData.asObservable();
changeHeaderData(headerDataNext : HeaderData) {
this.headerData.next(headerDataNext)
console.log("subscription - changeUserData - "+headerDataNext);
}
Explanation:
HeaderData is a class that includes the various values that can be shared with respective data types.
changeHeaderData({obj: value}), is used to update the subject with multiple values.
headerDataCurrent, an observable has to be subscribed to in the target component and data can be retrieved easily.
I mean i'm too l-a-z-y to use your slightly-not-so-much-tbh complicated answers so I just did this:
I added a counter that tops to 9 then gets resetted to 0 and I add it to the value
screwYouOnChangesImTheMasterAndYouShallDoMyBidding = 0;
//gets called onClick
openSettings(){
if(this.screwYouOnChangesImTheMasterAndYouShallDoMyBidding === 9){
this.screwYouOnChangesImTheMasterAndYouShallDoMyBidding = 0;
}
this.screwYouOnChangesImTheMasterAndYouShallDoMyBidding = this.screwYouOnChangesImTheMasterAndYouShallDoMyBidding + 1;
this.modalType = "settings"+this.screwYouOnChangesImTheMasterAndYouShallDoMyBidding;
}
then in the child component I just cut that last character out:
ngOnChanges(changes: SimpleChanges): void {
let change = changes["type"].currentValue as string;
change = change.substring(0, change.length - 1);
this.type = change;
this.openModal();
}
works like a charm 😂
I'm quite new to angular and wanted to know how to make it so i can have 1 page that you put the info you want to filter in the table and when you press "search" it will lead you to the second page where you see the table after its filtered.
i my question is odd but i really couldn't find any answer how to do this online.
I cant share code as its confidential to my work.
Something that looks like this site : https://maerskcontainersales.com/
I have tried using mock data but still couldn't put my head into the right thing to do.
There can be multiple ways how you can achieve this.
Using Provider
Suppose you have two pages and , serach-page is where you will enter your filters and result-page is where the table renders.
In search-page, you will create inputs( ex: textbox, dropdown etc ) and have ngModels for all of them, or you can use Angular reactive forms i.e FormGroup and FormControls. Users will select their input and click on search button, which will read values from models or controls and store them in the provider.
search-page.component.html
<form [formGroup]="searchForm" (submit)="search()">
<input formControlName="country" />
<input formControlName="city" />
...
<input type="submit">
</form>
search-page.component.ts
export class SearchPage {
...
search() {
const country = this.searchForm.get('country').value
...
// get rest of the values
...
this.searchService.setData({ country, city });
this.router.navigate(['/result']); // '/result' is path on the result-page
}
...
}
search.service.ts
#Injectable()
export class SearchService {
_data : any;
set data(val) {
this._data = val;
}
get data() {
return this._data;
}
}
result-page.component.ts
export class ResultPage {
...
ngOnInit() {
const filters = this.searchService.getData();
// filters will be your data from previous page
}
...
}
Using RouterParams
search-page.component.html
// same as before
search-page.component.ts
export class SearchPage {
...
search() {
const country = this.searchForm.get('country').value
...
// get rest of the values
...
this.router.navigate(['/result', { country, city }]); // '/result' is path on the result-page
}
...
}
result-page.component.ts
export class ResultPage {
...
constructor(route:ActivatedRoute) {
this.country = route.snapshot.paramMap.get("country")
// alternatively you can also do below
route.paramMap.subscribe(filters => {
// you will have your filters here
});
}
...
}
And once you have values of filters in result-page, use them to get data or filter data if already fetched, then render the table accordingly.
Let me know if I wasn't clear.
The simple solution I would suggest you to use a filter component and a results component a third container component. This component will get the filter criteria as an input variable and will output the filter criteria (using an output variable) when you press the "filter" button.
The container app will look like this:
<filterComponent (onFilter)="changeFilter($event)" [data]="someDate" *ngIf="!filterCriteria"></filterComponent>
<resultsComponent [data]="someDate" [filterCriteria]="filterCriteria" *ngIf="!!filterCriteria"></resultsComponent>
The filterCriteria that is sent to the second tableComponent will come from the eventEmmiter of the first tableComponent. The filterCriteria variable will be initiate to null and this will allow you to switch from one table to the other.
I have tried to search both the forum and Google extensively, but I have problems understanding how I should make this work:
PrimeFaces6
I have a BarchartModel based on the tutorial in the ShowCase:
CODE: SELECT ALL
private BarChartModel initStatusBarChart() {
BarChartModel model = new BarChartModel();
ChartSeries statusMessages = new ChartSeries();
statusMessages.setLabel("Label"));
statusMessages.set("Some String 1", list1.size());
statusMessages.set("Some String 2", list2.size());
model.addSeries(statusMessages);
return model;
}
The issue is that on render, I get tooltips the format of
"1, 515" and "2, 432", where 515 and 432 are the sizes of list1 and list2, respectively.
How can I replace 1 and 2 with the values "Some String" 1 and 2 ? Have tried extending highlighter and using dataTipFormat, with no success.
I solved the problem using the datatip editor of the chart model (with Primefaces 6.1, by the way). I used this for a stacked bar chart.
I needed to apply this solution at two places: the backing bean and the JSF page.
In the backing bean I had to set a JavaScript function name this way:
barModel.setDatatipEditor("chartDatatipEditor");
I tried to set it using the corresponding tag attribute in the JSF page but to no effect.
In the JSF I inserted this JavaScript code:
<script type="text/javascript">
function chartDatatipEditor(str, seriesIndex, pointIndex, plot) {
//console.log('chartDatatipEditor: '+str+" - "+seriesIndex+" - "+pointIndex);
var point = seriesIndex+','+pointIndex;
#{bean.datatipsJs}
}
</script>
This JS function gets the chart coordinates as parameters. I concat them so that the following JS code gets easier.
seriesIndex is the index of the chart series. pointIndex is the index on the X scale of the diagram.
To find out what are the correct values for your chart you can uncomment the console.log line above.
The inserted JS code is constructed in the backing bean this way:
private Map<String, String> chartDatatips;
public String getDatatipsJs() {
StringBuilder sb = new StringBuilder("switch ( point ) {\n");
for (String point : chartDatatips.keySet()) {
sb.append("case '").append(point).append("': return '").append(chartDatatips.get(point)).append("'; break;\n");
}
sb.append("default: return 'Unknown point'; break; }");
return sb.toString();
}
The map chartDatatips has the coordinate point as key (e.g., "2,1") and the tooltip as value.
During the chart setup you obviously have to fill this map with useful details ;-)
Like this:
chartDatatips.put("2,5", "Label ...");
...
Hope this helps, if you didn't already solved this.
~Alex
Based on Alex's answer I have come up with this. Only requiring javascript - it displays the label and value:
In the backing bean, set a JavaScript function name this way:
barModel.setDatatipEditor("chartDatatipEditor");
In the HTML file:
function chartDatatipEditor(str, seriesIndex, pointIndex, plot) {
return plot.series[seriesIndex].label + ' - ' + plot.data[seriesIndex][pointIndex];
}
How can I trigger a refresh of the template if a member of a data-bound complex object changes?
In the template:
<other-component data="{{complexObject}}"></other-object>
In the component:
_onChange: function(newData) {
//callback from some event-system
this.set("complexObject", newData);
}
The _onChange-Method is triggered when the complexObject is changed, but newData is always a reference to the same object, just members of this object changed - because of this, polymer doesn't update the view and doesn't pass the data down to other-component.
Is there a way to let polymer know that there is indeed some new data and it has to re-evaluate the template? It is working if I create a shallow clone of newData, but that seems like a hack and could hurt performance for big objects.
I can't use the set method to change the properties of the object via the path because the change happens outside of polymer-elements and I can't control it.
Call render()
this.$.yourTemplateID.render();
Here is one working example where sibling elements are interchanging data between each other: Plunk.
Docs: https://www.polymer-project.org/1.0/docs/devguide/data-binding.html#array-binding
<template>
<button on-tap="btnTapped">change Emploees from Second</button>
second: empl: <span>{{empl.employees.0.firstName}}</span>
</template>
...
<script>
btnTapped: function () {
console.log('Second: btnTapped');
//Propagate array subproperty
this.set('empl.employees.0.firstName', 'Test');
console.log(this.empl.employees[0].firstName);
//Object set
this.set('temp.firstName', 'Test');
}
</script>
this.complexObject = _.clone(this.complexObject)
cloning & reassigning might solve this problem`
I have problems binding this JSON to my list view.
http://pubapi.cryptsy.com/api.php?method=marketdatav2
No data is displayed.
Data.js
(function () {
"use strict";
var _list;
WinJS.xhr({ url: 'http://pubapi.cryptsy.com/api.php?method=marketdatav2' }).then(
function (response) {
var json = JSON.parse(response.responseText);
_list = new WinJS.Binding.List(json.return.markets);
},
function (error) {
//handle error
}
);
var publicMembers =
{
itemList: _list
};
WinJS.Namespace.define("DataExample", publicMembers);
})();
HTML:
<section aria-label="Main content" role="main">
<div id="listItemTemplate" data-win-control="WinJS.Binding.Template">
<div class="listItem">
<div class="listItemTemplate-Detail">
<h4 data-win-bind="innerText: label"></h4>
</div>
</div>
</div>
<div id="listView" data-win-control="WinJS.UI.ListView" data-win-options="{itemDataSource : DataExample.itemList, itemTemplate: select('#listItemTemplate'), layout: {type: WinJS.UI.GridLayout}}"></div>
</section>
I feel that the API is not that well formed.
Isnt this part a bit odd?
"markets":{"ADT/XPM":{...}...}
There are three things going on in your code here.
First, a ListView must be bound to a WinJS.Binding.List's dataSource property, not the List directly. So in your HTML you can use itemDataSource: DataExample.itemList.dataSource, or you can make your DataExample.itemList dereference the dataSource at that level.
Second, you're also running into the issue that the declarative binding of itemDataSource in data-win-options is happening well before DataExample.itemList is even populated. At the point that the ListView gets instantiated, _list and therefore itemList will be undefined. This causes a problem with trying to dereference .dataSource.
The way around this is to make sure that DataExample.itemList is initialized with at least an empty instance of WinJS.Binding.List on startup. So putting this and the first bit together, we have this:
var _list = new WinJS.Binding.List();
var publicMembers =
{
itemList: _list.dataSource
};
With this, you can later replace _list with a different List instance, and the ListView will refresh itself.
This brings us to the third issue, populating the List with your HTTP response data. The WinJS.Binding.List takes an array in its constructor, not an object. You're passing the parsed JSON object straight from the HTTP request, which won't work.
Now if you have a WinJS.Binding.List instance already in _list as before, then you can just walk the object and add items directly to the List as follows:
var jm = json.return.markets;
for (var i in jm) {
_list.push(jm[i]);
}
Alternately, you could populate a separate array and then create a new List from that. In this case, however, you'll need to assign that new List.dataSource to the ListView in code:
var jm = json.return.markets;
var markets = [];
for (var i in jm) {
markets.push(jm[i]);
}
_list = new WinJS.Binding.List(markets);
var listview = document.getElementById("listView").winControl;
listview.itemDataSource = _list.dataSource;
Both ways will work (I tested them). Although the first solution is simpler and shorter, you'll need to make sure to clear out the List if you make another HTTP request and repopulate from that. With the second solution you just create a new List with each request and hand that to the ListView, which might work better depending on your particular needs.
Note also that in the second solution you can remove the itemDataSource option from the HTML altogether, and also eliminate the DataExample namespace and its variables because you'll assign the data source in code each time. Then you can also keep _list entirely local to the HTTP request.
Hope that helps. If you want to know more about ListView intricacies, see Chapter 7 of my free ebook from MSPress, Programming Windows Store Apps with HTML, CSS, and JavaScript, Second Edition.