Ngfor with index

Angular makes use of HTML for templates associated with components which eventually represent the views of your front-end application.

See the bundle then add to cart and your discount is applied. Follow the ultimate Angular roadmap. The most complete guide to learning Angular ever built. Trusted by 82, students. Google Developer Expert. You can see all other variables exposed to us in the NgForOf documentation. You can see now how ngFor works behind the scenes.

Ngfor with index

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:. This template will generate the HTML table that we showed just above. We can see in this example the most common syntax for using ngFor :. Note that the loop variable hero is only visible inside the loop, you would not be able to access it outside the ngFor section. If you have an AngularJs background, you will see this error a few times before you get used to the new Angular syntax:. This is because you have accidentally either used item in items instead of item of items , or forgot to add the let keyword at the beginning of the expression:. A very common requirement is to add to a list the numeric index position of its element. We can get the index of the current element by using the index variable:.

When to use trackBy? Just like the even and odd functionality, there are also two other variables that can be used to identify the first and the last elements of the list:.

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. Skip to content.

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.

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.

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Please go through our recently updated Improvement Guidelines before submitting any improvements. If you have an AngularJs background, you will see this error a few times before you get used to the new Angular syntax:. Thank you for your valuable feedback! ActivatedRoute just left the chat. With ngFor we can print this data to the screen under the form of a data table, by generating HTML similar to this:. A component controls a part of your application user interface and the associated template is what gets rendered in that part of the UI. Say hello to router input bindings straight to your components. Save Article. Engineering Exam Experiences. Hire With Us.

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 see in this example the most common syntax for using ngFor :. Related Articles. Turns out the QueryList is a class that is part of Angular and is itself an Iterable! You've got mail! As the input list gets modified, ngFor will try to avoid to constantly create and destroy the DOM elements of the list, as this is an expensive operation. Is ngFor only For Arrays? Article Tags :. Submit your entries in Dev Scripter today. Note that the loop variable hero is only visible inside the loop, you would not be able to access it outside the ngFor section. Many of the existing DOM elements will be reused and only some values inside them will be overwritten, and the decision is taken for each element in the list separately. Suggest changes.