I'm making an web-app in angular 4 and there is a question i came up with. It's the following:
I use a property called currentLesson. This property has a variable number from 1 to 6. In my component I have an list of 6 lessons where each lesson has it's own button to start this lesson.
In this list it should only be available to click the button when the currentLesson has the value of the number of the lesson:
Button of lesson 1 is active when : currentLesson = 1
Button of lesson 2 is active when : currentLesson = 2
Etc. etc.
So if currentLesson = 2, the buttons of lesson 1, 3, 4, 5 and 6 should be disabled.
I have the following set-up but it doesn't seem to work. In my component i have:
export class ClassComponent implements OnInit {
classes = [
{
name: 'string',
level: 'string',
code: 'number',
currentLesson: '1'
}]
checkCurrentLesson1 = function(classes) {
if (classes.currentLesson = 1) {
return true;
}
else {
return false;
}
};
checkCurrentLesson2 = function(classes) {
if (classes.currentLesson = 2) {
return true;
}
else {
return false;
}
};
And my html file is like this:
<ul class="table lessonOverview">
<li>
<p>Lesson 1</p>
<button [routerLink]="['/lesson1']"
[disabled]="!checkCurrentLesson1" class="primair">
Start lesson</button>
</li>
<li>
<p>Lesson 2</p>
<button [routerLink]="['/lesson2']"
[disabled]="!checkCurrentLesson2" class="primair">
Start lesson</button>
</li>
</ul>
(I only printed two of the six lessons, but they are all the same)
Has anyone an solution or idea for me?
Thanks in advance,
Maarten
This question is related to
javascript
angular
typescript
button
Set a property for the current lesson: currentLesson. It will hold, obviously, the 'number' of the choosen lesson. On each button click, set the currentLesson value to 'number'/ order of the button, i.e. for the first button, it will be '1', for the second '2' and so on.
Each button now can be disabled with [disabled] attribute, if it the currentLesson is not the same as it's order.
HTML
<button (click)="currentLesson = '1'"
[disabled]="currentLesson !== '1'" class="primair">
Start lesson</button>
<button (click)="currentLesson = '2'"
[disabled]="currentLesson !== '2'" class="primair">
Start lesson</button>
.....//so on
Typescript
currentLesson:string;
classes = [
{
name: 'string',
level: 'string',
code: 'number',
currentLesson: '1'
}]
constructor(){
this.currentLesson=this.classes[0].currentLesson
}
Putting everything in a loop:
HTML
<div *ngFor="let class of classes; let i = index">
<button [disabled]="currentLesson !== i + 1" class="primair">
Start lesson {{i + 1}}</button>
</div>
Typescript
currentLesson:string;
classes = [
{
name: 'Lesson1',
level: 1,
code: 1,
},{
name: 'Lesson2',
level: 1,
code: 2,
},
{
name: 'Lesson3',
level: 2,
code: 3,
}]
export class ClassComponent implements OnInit {
classes = [
{
name: 'string',
level: 'string',
code: 'number',
currentLesson: '1'
}]
checkCurrentLession(current){
this.classes.forEach((obj)=>{
if(obj.currentLession == current){
return true;
}
});
return false;
}
<ul class="table lessonOverview">
<li>
<p>Lesson 1</p>
<button [routerLink]="['/lesson1']"
[disabled]="checkCurrentLession(1)" class="primair">
Start lesson</button>
</li>
<li>
<p>Lesson 2</p>
<button [routerLink]="['/lesson2']"
[disabled]="!checkCurrentLession(2)" class="primair">
Start lesson</button>
</li>
</ul>
<div class="col-md-12">
<p style="color: #28a745; font-weight: bold; font-size:25px; text-align: right " >Total Productos a pagar= {{ getTotal() }} {{ getResult() | currency }}
<button class="btn btn-success" type="submit" [disabled]="!getResult()" (click)="onSubmit()">
Ver Pedido
</button>
</p>
</div>
Source: Stackoverflow.com