In the first part of this Angular tutorial series, you saw how to get started with creating a Grocery List Manager using Angular. You learnt how to create the view for the Grocery component, adding items to the grocery list and displaying the added items.
In this part, you'll implement the features to mark completed items, edit existing items, and remove added items.
Let's get started by cloning the source code from the first part of the tutorial. From your terminal, write in the following code to clone the source code:
git clone https://github.com/royagasthyan/AngularGrocery
Once the source code has been cloned, navigate to the project folder and install the required dependencies.
cd AngularGrocery npm install
After installing the dependencies, you will be able to start the server. From the project folder, type in the following commands:
ng serve
Point your browser to http://localhost:4200/ and you should have the application running.
Once you have the grocery items added to the list, you should be able to edit and update the items. Let's provide an edit button in the listing grid which, when clicked, will enable the editing of existing items.
Modify the app.grocery.html
code to include the edit button inside the grid.
<span class="glyphicon glyphicon-pencil floatright"></span>
Save the above changes and restart the server. Load the page and enter a few items and you will have the edit button for each item.
When the user clicks the edit button, you need to add an on click method to handle the item edit. Modify the app.grocery.html
to add an on click event for editing the item.
<span (click)="onEdit(task)" class="glyphicon glyphicon-pencil floatright"></span>
Pass the task
to the onEdit
method as shown in the above code to identify the item to be edited.
Inside the GroceryComponent
class initialize the task
scope variable as shown:
task = { name: '', id: 0 };
In the onClick
method, you'll check for the id
to see if it's an existing item or a new item. Modify the onClick
method as shown:
if(this.task.id == 0){ this.tasks.push({id: (new Date()).getTime(),name: this.task.name}); }
As seen, you have assigned a unique time stamp as id
to each task. Now let's define the onEdit
method to edit the existing item. Inside the onEdit
method, assign the passed in item
to the task
variable.
onEdit(item){ this.task = item; }
Save the changes and restart the server. Enter a new item in the grocery list and click on the corresponding edit button. You will be able to edit and update the entry by clicking the OK
button.
Let's add a delete icon to remove the existing items. Update the app.grocery.html
file to modify the HTML code as shown:
<span class="glyphicon glyphicon-remove floatright paddingLeft"></span>
Here is how the complete app.grocery.html
file looks:
<div> <h2> Grocery list manager </h2> <div class="row"> <div class="col-xs-6 col-md-4"> <div class="input-group"> <input type="text" class="form-control" placeholder="enter grocery items" [(ngModel)]="task.name" /> <div class="input-group-btn"> <button class="btn btn-primary" type="button" (click)="onClick()"> <span class="glyphicon glyphicon-ok"></span> </button > </div> </div> <ul class="list-group"> <li *ngFor="let task of tasks" class="list-group-item"> <span> {{ task.name }} </span> <span class="glyphicon glyphicon-remove floatright paddingLeft"></span> <span (click)="onEdit(task)" class="glyphicon glyphicon-pencil floatright"></span> </li> </ul> </div> </div> </div>
Add an on click event to the remove icon to delete the grocery item.
<span (click)="onDelete(task)" class="glyphicon glyphicon-remove floatright paddingLeft"></span>
Save the changes and restart the server. Try adding new items to the grocery manager app and you will have the items listed along with the delete and edit icons.
To implement the delete functionality, you need to add the onDelete
method in the app.grocery.ts
file as shown:
onDelete(item){ // Delete functionality will be here }
Once the user clicks the delete icon, you need to check the item id
against the grocery item list and remove the entry from the tasks
list. Here is how the onDelete
method looks:
onDelete(item){ for(var i = 0;i < this.tasks.length; i++){ if(item.id == this.tasks.id){ this.tasks.splice(i,1); break; } } }
As seen in the above code, you have iterated the tasks
list and checked it against the clicked item id
. If it matched the item in the tasks
list, it is removed using the splice
method.
Save the above changes and restart the server. Add a few items to the grocery list manager. It will be added with the delete and edit icons to the task list grid. Try clicking on the remove icon and the item will be deleted from the items list.
Let's add the functionality to strike out the items added to the list. Once the user is done with the tasks in the grocery list manager, it should be possible to strike out the completed tasks. To track the new and completed tasks, add a new variable strike
to the task information.
Modify the onClick
method to include the new strike
variable as shown:
onClick(){ if(this.task.id == 0){ this.tasks.push({id: (new Date()).getTime(),name: this.task.name, strike: false}); } this.task = { name: '', id: 0 }; }
Add a new class called strike
in the src/style.css
file which would strike out the item.
.strike{ text-decoration:line-through; }
Include an on click event on the item to toggle the strike
variable in the items variable. You'll be applying the strike
class to the items based on the boolean value of the strike
variable. By default, it will be false. Here is the onStrike
method to toggle the strike variables value:
onStrike(item){ for(var i = 0;i < this.tasks.length; i++){ if(item.id == this.tasks.id){ if(this.tasks.strike){ this.tasks.strike = false; } else{ this.tasks.strike = true; } break; } } }
As seen in the above method, you iterate through the list of items. Once the item is found, you toggle the strike value.
Based on the strike
variable, you need to apply the class strike
to the task name span. Here is how it looks:
<span (click)="onStrike(task)" [ngClass]="{'strike': task.strike}"> {{ task.name }} </span>
As seen, you have used the ngClass
directive to apply the class strike
to the span element if the task.strike
value is true
.
Save the above changes and restart the server. Add the items to the list and click on the added item. Once clicked, the item will be struck out as expected.
In this tutorial, you saw how to update, delete and mark the task as complete in the grocery manager app using Angular. I hope you enjoyed the tutorial. Do let me know your thoughts in the comments below.
JavaScript has become one of the de facto languages of working on the web. It’s not without its learning curves, and there are plenty of frameworks and libraries to keep you busy, as well. If you’re looking for additional resources to study or to use in your work, check out what we have available in the Envato marketplace.
Oh, and don't forget that the source code from this tutorial is available on GitHub.
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waly Good blog post. I absolutely love this…