How do convert object to JSON and output it on html page?
public User:UserInfo=
{
firstName: "O",
lastName: "K",
email: "ol#op.com",
country: "uk",
avatarUrl: null,
receiveNotifications: true
}
I wish you had given us a bit more detail in your question, but I will do my best here so bear with me! Let's say you have an object that looks like this
a.component.ts
public obj = {
name: "Oleg",
question: "convert object to json",
description: "Some cool question about angular and JSON"
}
To present this data, your view would look like this
a.component.html
<h1> {{ obj.name }} </h1>
<h2> {{ obj.question }} </h2>
<p> {{ obj.description }} </p>
Please pay attention to how my class member is set to public, this is important whenever you are going to create an AoT build of the application.
If you are having trouble understanding, my simplified example. Check out this example
I can see that you are coming from the jQuery world, but with angular.js things are getting much simpler, please check this jsFiddle:http://jsfiddle.net/pkozlowski_opensource/ASspB/1/
With angular.js you can attach events much, much simpler:
<input type="button" ng-click="showJson()" value="Object To JSON" />
and then in your controller:
$scope.showJson = function() {
$scope.json = angular.toJson($scope.user);
}
In fact this could be done even easier with angular.js filters, check this jsFiddle: http://jsfiddle.net/pkozlowski_opensource/ASspB/2/ which has:
{{user | json}}
You can try the following:
let jsonStr=JSON.stringify(user).
Related
I have the following JSON object:
header: {
first: {
title: {
name: "Test
}
},
second: {
title: {
name: "Test 2"
},
desc: {
name: "Description"
}
}
}
Now I want to show it in view like that:
How can I manage to do that in the view? Since the keys will vary every time. For example once you have header, another time main and so on... Something like JSONEditor, where you can edit JSON objects. But I want to create something like that with my own design. I tried with ngIf but it seems really difficult. I'd be really thankful for any suggestions or help.
You can use the KeyValuePipe to iterate over objects using ngFor.
<!-- app-your-node component -->
<div *ngFor="let item of object | keyvalue">
{{ title }}
<app-your-leaf *ngIf="yourLogicThatThisIsALeaf(item); else node"
[title]="item.key" [object]="item.value"><app-your-leaf>
<ng-template #node>
<app-your-node [title]="item.key" [object]="item.value"></app-your-node>
</ng-template>
</div>
The following Json is recieved by the Vue Script, from a Php script which encodes an Array of Objects into JSON.
[{"title":"Clean Drinking Water","content":"Some Content","link":"abd.html","img":"<img src="kkk.jpg" />"
},
{"title":"Clean AAAAAter Provided","content":"Lore Lipsum
Test","link":"abc.html","img":"<img src="kkk.jpg" width="320" />"
}
]
How do i access title, content, link and image data from this Json using Vue. My Vue Code is
const url="lkl.php?get=json";
const vm=new Vue({
el:'#app',
data:{
results:[]
},
mounted(){
axios.get(url).then(response=>{
this.results=response.data
})
}
});
I have tried {{ results.title }} {{ results[0].title }} but that doesn't seem to work. I am fairly new to Vue. Any help would be much appreciated.
I am writing this post after having read several threads concerning this topic but no one of them gives me what I need. This post seems to have the solution but I do not have to read the checked values from the json.
All I need is to:
read countries from an array of objects
build dinamically a list of checkbox representing each country
user should check and uncheck each checkbox
bonus:
get the value of the checked input and send it outside the component
I know It might be really dumb to do but all I have accomplished untile now is to have a list of uncheckable checkboxes and nothing more.
Here is the code:
Template:
<div class="form-group">
<div *ngFor="let country of countries">
<input type="checkbox"
name="countries"
value="{{country.id}}"
[(ngModel)]="country"/>
<label>{{country.name}}</label>
</div>
</div>
And TS:
countries = [
{id: 1, name: 'Italia'},
{id: 2, name: 'Brasile'},
{id: 3, name: 'Florida'},
{id: 4, name: 'Spagna'},
{id: 5, name: 'Santo Domingo'},
]
I tried to use the reactive forms but that gave me more issues then template driven (surely because of bad implementation of mine).
Please, help me, I do not know where to bump my head anymore
Here is a working example, where you can observe that an additional 'checked' value is added to each country, and bound to the value of each checkbox with [(ngModel)].
Stackblitz live example
template:
<p>
Test checkboxes
</p>
<div *ngFor="let country of countries; let i = index;">
<input type="checkbox" name="country{{country.id}}" [(ngModel)]="countries[i].checked">
<label for="country{{country.id}}">{{country.name}}</label>
</div>
<button type="button" (click)="sendCheckedCountries()" *ngIf="countries">Click to send the selected countries (see your javascript console)</button>
<p *ngIf="!countries">loading countries, please wait a second...</p>
<p *ngIf="countries">Debug info : live value of the 'countries' array:</p>
<pre>{{ countries | json }}</pre>
component :
//...
export class AppComponent implements OnInit {
public countries: Country[];
constructor(private countryService: CountryService) {}
public ngOnInit(): void {
// loading of countries, simulate some delay
setTimeout(() => {
this.countries = this.countryService.getCountries();
}, 1000);
}
// this function does the job of sending the selected countried out the component
public sendCheckedCountries(): void {
const selectedCountries = this.countries.filter( (country) => country.checked );
// you could use an EventEmitter and emit the selected values here, or send them to another API with some service
console.log (selectedCountries);
}
}
To use some proper TypeScript, I made an interface Country :
interface Country {
id: number;
name: string;
checked?: boolean;
}
I hope you get the idea now.
Note : the checked value is not "automatically there" at the beginning, but it doesn't matter.
When not there, it is the same as undefined, and this will be treated as false both in the checkbox and in the function that reads which country is checked.
For the "sending value" part :
The button will output the selected value to the browser's console, with some filter similar to what #Eliseo's answer suggests (I just used full country objects instead of ids)
For "real usecase" situation, you could use Angular's EventEmitters and have your component "emit" the value to a parent component, or call some service function that will make a POST request of your values to another API.
Your countries like
{id: 1, name: 'Italia',checked:false},
Your html like
<div *ngFor="let country of countries">
<input type="checkbox" [(ngModel)]="country.checked"/>
<label>{{country.name}}</label>
</div>
You'll get an array like, e.g.
[{id: 1, name: 'Italia',checked:false},{id: 2, name: 'Brasile',checked:tue}..]
you can do
result=this.countries.filter(x=>x.checked).map(x=>x.id)
//result becomes [2,...]
I had an error using [(ngModel)]
In case it serves anyone, I have solved the problem changing
[(ngModel)]
to:
[checked]="countries[i].checked" (change)="countries[i].checked= !countries[i].checked"
I have this in my HTML:
<div class="ui-g" *ngFor="let orderTracking of orderTrackings, let i=index" (click)="selectItemForRequest(i)" [ngClass]="{'active' : selectedOrderTracking===i }">
<technical-destinations *ngIf="orderTrackings.length" class="technical_destinations {{i}}" [orderTracking]="orderTracking" [groupDestinations]="groupDestinations"></technical-destinations>
</div>
In technical destinations I have dropdown, but when i change one every of them changes. Problem is that in orderTracking all object are same. Its just copy.
Any suggestion for how can I fix that?
I tried to reproduce your issue by iterating over a component with #Inputs.
So you said the objects in the collection you're iterating over are the same, so let's take something like:
items = [
{id:1, name: 'test'},
{id:1, name: 'test'},
{id:1, name: 'test'}
];
If you're looping over the above array, Angular is designed to create new instances of the repeated component for you:
<div *ngFor="let item of items">
<app-object [item]="item"></app-object>
</div>
Working example here: https://stackblitz.com/edit/angular-w8s6qt
If I missed something just tell me.
I have a working form taking the following HTML markup. No errors or warnings.
<div class="input-element">
<div class="input-caption">Title</div>
<input type="text"
formControlName="targetField"
class="form-control">
</div>
I transformed it into a custom component, which also works, as shown below.
<app-input-text [info]="'Title'"
formControlName="targetField"
ngDefaultControl></app-input-text>
In my next view, I need to use FormArray as follows - still working code.
<div formArrayName="stuff">
<div *ngFor="let thing of form.controls.stuff.controls; let i = index;"
[formGroupName]=i>
<div class="input-element">
<div class="input-caption">Title</div>
<input type="text"
formControlName="targetField"
class="form-control">
</div>
</div>
</div>
Now, I expected that combining both (i.e. being able to use custom input component and being able to form array for components) would post no problem. However, the sample below doesn't work.
<div formArrayName="stuff">
<div *ngFor="let thing of form.controls.stuff.controls; let i = index;"
[formGroupName]=i>
<app-input-text [info]="'Title'"
formControlName="targetField"
class="col-sm-6"></app-input-text>
</div>
</div>
It generates the following error.
No value accessor for form control with path: 'stuff -> 0 -> targetField'
The custom component is design like this (although given that it works in the explicit markup example, I'm not sure if it's relevant information). The only (wild) guess I have might be that value isn't jacked into the form array field somehow.
export class InputTextComponent implements OnInit {
constructor() { this.value = new EventEmitter<string>(); }
#Input() info: string;
#Output() value: EventEmitter<string>;
onEdit(value: any): void { this.value.emit(value); }
}
The group and array creating in the current view is done like this (not sure if this is of any relevance neither, as it works for the explicit HTML markup case).
this.form = builder.group({
id: "",
stuff: builder.array([
builder.group({ targetField: "aaa" }),
builder.group({ targetField: "bbbb" }),
builder.group({ targetField: "cc" })
])
});
Is there a limitation in Angular in this regard that I'm not aware of? I'm rather sure there's not and that I'm just doing something fairly clever simply missing a tiny detail.
I do understand the error but I can't see how it relates to the code. The form can't find the 0th element in the array or that element has no field of that name. Since I do get to see a few rows, I know there must be a 0th element. Since I specified the name of the field, I know there is indeed such. What else am I missing?