Ngfor with index

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NgFor is used as a structural directive that renders each element for the given collection each element can be displayed on the page. In this article, we will learn how to store the index value of ngFor in an attribute so I can utilize it. Step 2: After creating your project folder i. Example 1: In this example, we will use an index as i. Here, the Index is an attribute in ngFor which tells the sequence of the object retrieved. Here, the index is an attribute in ngFor which tells the sequence of the object retrieved.

Ngfor with index

Angular makes use of HTML for templates associated with components which eventually represent the views of your front-end application. A component controls a part of your application user interface and the associated template is what gets rendered in that part of the UI. The array must be present in the associated component. Here is how:. We use the ngFor directive to iterate over the array of movies and display the title of each movie. After the let keyword, we add a variable, which can be any valid variable name, that will be used to reference and access each element of the array and after the of keyword, we add the array of data which must be present in the component. Angular provides the reserved index keyword inside the ngFor expression which can be used as follows:. Inside the ngFor expression, we defined another variable called i which gets assigned the index keyword which simply contains the current index of each element in each iteration. And we used interpolation to display the value of the i and movie. Angular also provides the reserved first and last keywords for getting the first and last items in the array. Angular provides the trackBy feature which allows you to track elements when they are added or removed from the array for performance reasons. We can simply identify each element in a unique way using its id. We can use other features like index , first , last and trackBy to get the index of the current element, the first and last elements and for tracking the addition or removal of the array elements for performane reasons. What is ngFor in Angular Template Syntax? How to Use ngFor in Angular 10 Templates?

So although we can use it programmatically in the component class, ngfor with index, we can also pass it directly to ngFor and iterate over it directly. If you have an AngularJs background, you will see this error a few times before you get used to the new Angular syntax:. Here is how:.

In this post we are going to go over the ngFor core directive, namely we are going to go over the following:. So let's get started diving into ngFor! Below you can also find a video version of this post if you prefer, and the running code of this post is available here. Note: If instead of ngIf you are looking for the for syntax, then check my other guide instead: Angular for: Complete Guide. The core directive ngFor allows us to build data presentation lists and tables in our HTML templates. Let's take for example the following data:. With ngFor we can print this data to the screen under the form of a data table, by generating HTML similar to this:.

Angular makes use of HTML for templates associated with components which eventually represent the views of your front-end application. A component controls a part of your application user interface and the associated template is what gets rendered in that part of the UI. The array must be present in the associated component. Here is how:. We use the ngFor directive to iterate over the array of movies and display the title of each movie. After the let keyword, we add a variable, which can be any valid variable name, that will be used to reference and access each element of the array and after the of keyword, we add the array of data which must be present in the component.

Ngfor with index

We will discover, how we can use the ngFor directive to display multiple elements directly from a JavaScript array. Also, we will take a look at the utilities of the ngFor directive, like the index, or even and odd. When we got the basics, we will move on to some more advanced topics like change-detection and DOM manipulation to tweak the performance of our for-loop using trackBy. We can use this directive, if we want to display a dynamic list, for example, an array of elements on the screen. This array could look like this example data:. That array could be static and look like the array above or could be filled at runtime.

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Like Article Like. Interview Experiences. Explore offer now. Hire With Us. Learn why ngFor is not only for arrays A quick question for you at the end about learning So let's get started diving into ngFor! What kind of Experience do you want to share? We use cookies to ensure you have the best browsing experience on our website. Angular also provides the reserved first and last keywords for getting the first and last items in the array. How are list items tracked by default? Do you see what happened here?

In this quick how-to tutorial we'll be learning about the ngFor directive in Angular and how to use it to display arrays of data in your Angular templates.

Angular 6. Contribute to the GeeksforGeeks community and help create better learning resources for all. Free Download. HTML Examples. Write Angular like a pro. Trending in News. See the bundle then add to cart and your discount is applied. And the same could be done with any other Iterable in our program. We need to pass a function to trackBy , and the function takes a couple of arguments, which are an index and the current item: This implementation would do the tracking based on the id property. Work Experiences. I hope you enjoyed the post, I invite you to have a look at the list below for other similar posts and resources on Angular.