Angular 6 server side pagination example

In this post, we are going to go through a complete example of how to use the Angular Material Data Table.

angular 6 server side pagination example

We are going to cover many of the most common use cases that revolve around the Angular Material Data Table component, such as: server-side pagination, sorting, and filtering.

This is a step-by-step tutorialso I invite you to code along as we are going to start with a simple initial scenario. We will then progressively add features one by one and explain everything along the way including gotchas. In order to run our example, let's first import all the Angular Material modules that we will need:.

The Material Data Table component is a generic component for displaying tabulated data. Although we can easily give it a Material Design look and feel, this is actually not mandatory.

To see that this is so, let's start by creating a Data Table where the table cells are just plain divs with no custom CSS applied. This data table will display a list of course lessons, and has 3 columns sequence number, description and duration :. As we can see, this table defines 3 columns, each inside its own ng-container element.

The ng-container element will NOT be rendered to the screen see this post for more detailsbut it will provide an element for applying the matColumnDef directive. The matColumnDef directive uniquely identifies a given column with a key: seqNo, description or duration. Inside the ng-container element, we will have all the configuration for a given column. Notice that the order of the ng-container elements does NOT determine the column visual order. These directives always end with the Def postfix, and they are used to assign a role to a template section.

Inside of each ng-container with a given column definition, there are a couple of configuration elements:. These two structural directives only identify which template elements have a given role cell template, header templatebut they do not attach any styling to those elements.

For example, in this case, matCellDef and matHeaderCellDef are being applied to plain divs with no styling, so this is why this table does not have a Material design yet. For that, we will use a couple of built-in components in our header and cell template definitions:.

This template is almost the same as the one we saw before, but now we are using the mat-header-cell and mat-cell components inside our column definition instead of plain divs. Using these components, lets now have a look at what the Data Table looks like with this new Material Design:. Notice that the table already has some data!

We will get to the data source in a moment, right now let's continue exploring the rest of the template. The data cell template has access to the data that is being displayed. In this case, our data table is displaying a list of lessons, so the lesson object in each row is accessible via the let lesson syntax, and can be used in the template just like any component variable. The matHeaderRowDef directive also defines in which order the columns should be displayed.Pagination in ag-Grid is supported in all the different row models.

The Client-side Row Model the default row model is used for the examples on this page. Pagination does not reduce the feature set of the grid, as long as the underlying row model supports it.

In other words, if you are paging over the Client-side Row Model, all features of the Client-side Row Model grouping, filtering etc are still available. Likewise for the other row models, if the row model supports it, it's available through pagination and that row model. This is demonstrated below. Note if you resize the display area of the grid, the page size automatically changes.

To view this, open the example up in a new tab and resize your browser. This is useful is you want to provide your own navigation controls. In the example below you can see how this works. Note that we are listening to onPaginationChanged to update the information about the current pagination status.

We also call methods on the pagination API to change the pagination state.

angular 6 server side pagination example

Both Row Grouping and Master Detail have rows that expand. When this happens, consideration needs to be given as to how this impacts the number of rows on the page. There are two modes of operation that can be used depending on what your application requirements.

The first mode is the default. The rows are split according to the top level rows. For example if row grouping with a page size of 10, then each page will contain 10 top level groups.

When expanding a group with this mode, all children for that group, along with the 10 original groups for that page, will get display in one page. This will result in a page size greater than the initial page size of 10 rows. This mode is typically best suited for Row Grouping as children are always displayed alongside the parent group.

It is also typically best for Master Detail, as detail rows that typically contain detail tables will always appear below their master rows. The second mode paginates all rows, including child rows when Row Grouping and detail rows with Master Detail.Server side pagination is very useful when we are dealing with huge amounts of data. At that time client side pagination will take a long time to get all the data at the same time, so it's better to make a Server call on every page request.

We are going to see all employee data with pagination and we will make a Server call on every page request. NET to access the data from the database. Let's start with a sample Application for better understanding.

We are going to use Visual Studio for this example. Now, select ASP. Now, our Web API project is ready. Give the Controller name as EmployeeController and click Add button, as shown below. We will write GET Action method later in this article. Give the class name Employee. In a similar way, add one more class as EmployeeList. Now, add one more folder for database operation as DBOperation and inside this folder, add class as EmployeeInfo.

Inside this class, we are using ADO. Now, time to write our GET Action in the controller has come, where you can get the employees information from GetEmployees methods.

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In the code given above, we are using two parameters as pageIndex and pageSize to get the current page information and a total number of employees to be displayed respectively. Similarly, inside the UI folder, create one more folder named as Resources and keep the angular. Our solution structure looks, as shown below. In the code given above, the main thing is that we have to understand is pagination element and its attributes. Whenever a user will click any page number, the pageIndex value will change and it will call pageChanged method and we are calling getEmployeeList method from pageChanged method.

Here, the users can also change the maximum number of items per page by using the drop-down. We also saw that we can change the maximum number of items per page from the dropdown. Download the attachment for the source code of the sample Application and the script files for the database operations.

View All. Vivek Kumar Updated date, Mar 25 Write all the properties in Employee. A value less than one indicates all the items on one page. Next Recommended Article. Getting Started With.

Server Side Pagination Made Easy with Akita and Angular

NET 5. Getting Started with ML. NET Core.When you work with tables or lists, you will withstand a situation at some time where you would need Pagination. Well, in the article we will implement a Server side pagination Angular 2.

This command will create all the necessary files, download all the required external dependencies and do all of the setup work for us. In this application, I am using NodeJs as a server side language. I think Nodejs part is not that much interesting here. In order to use ng2-pagination first, you will need to install it from NPM, run the below command to do the same. Above command will download and install the ng2-pagination module and at the same time, save it to package. Use the below command to create a HTTP service, ng generate service http.

Nothing new Here just a get request with page number using observable. For now our application knows nothing about this service. We will use this service later in this article.

Whenever you create any new application in angular 2 using Angular Cli, it ships with a default component inside app directory, so we will be using that component only. Basically, it renders the navigation links to paginate between the pages. This component requires some attributes listed below. Now if you notice again I have written the below line in the pagination-controls component. In the below code, I am doing two things. Here we have used the http service, which we created earlier by importing it and providing it into the providers attribute of the component decorator.

In constructor method two things are happening first we are creating the private instance of the HTTP service. In this article, we created a simple Server side Pagination in Angular 2 with minimum complexity. Although there are other modules available for pagination in angular 2 but personally I found ng2-pagination easy to get started. If you have any question or suggestion Let me know in below comment box. What if I want to see the details of a user when I am on page 3 and get a back button its going to take me back to page1 instead of 3 cause thats how I placed in the constructor How would you handle that?

There are multiple ways to achieve this.If you need to support an earlier or pre-release version of Angular for now, please see the changelog for advice on which version to use. This means that all the JavaScript code is located in a single ES5-compatible file, but makes use of ES import and export statements. The PaginatePipe should be placed at the end of an NgFor expression. It accepts a single argument, an object conforming to the PaginationInstance interface.

The following config options are available:. This a default component for displaying pagination controls. It is implemented on top of the PaginationControlsDirectiveand has a pre-set template and styles based on the Foundation 6 pagination component. If you require a more customised set of controls, you will need to use the PaginationControlsDirective and implement your own component.

The PaginationControlsDirective is used to build components for controlling your pagination instances. The directive selector is pagination-templateeither as an element or an attribute. It exports an API named "paginationApi", which can then be used to build the controls component. For a real-world implementation of a custom component, take a look at the source for the PaginationControlsComponent.

The PaginationControlsComponent can be styled by simply overriding the default styles. To avoid specificity issues, just add your own custom class name to the element, which will allow your styles to override the defaults:. In many cases - for example when working with very large data-sets - we do not want to work with the full collection in memory, and use some kind of server-side paging, where the server sends just a single page at a time.

This will allow the correct number of page links to be calculated. To see a complete example of this including using the async pipesee the demo. To do this, just make use of the "id" attribute:. A common issue is that people have trouble combining some kind of filter pipe with the paginate pipe. The typical symptom is that only the contents of the current page are filtered.

The reason is that the paginate pipe must come after the filter pipe :. Using the index variable exposed by ngFor will always give you the index of the items relative to the current page. For example, if you have 10 items per page, you might expect the first item on page 2 to have an index value of 10, whereas you will find the index value to be 0. This is because ngFor has no knowledge of the pagination, it only ever knows about the 10 items of the current page.

You can also use test:watch to keep tests running in watch mode. Git github. Pagination for Angular The simplest solution for pagination in Angular.

How do I use the ngFor index with the pagination pipe? How do I get the absolute index of a list item? Webpack, Systemjs and Rollup all support this format and should work without problems. Keywords angular angular2 pagination. Install npm i ngx-pagination Downloads Weekly Downloads 60, Version 5. License MIT. Unpacked Size kB. Total Files Homepage github.When developing applications, we often need to deal with large data-sets.

Imagine a scenario where we have one million records in the database, and we require to show it on a web page. We generally want to avoid sending all the data at once.

angular 6 server side pagination example

The reasons for that are 1 We want a faster initial page load. Instead, server-side paging is used, where the server sends just a single page at a time. In addition to that, we also want to cache pages that already have been fetched, to spare the need for an additional request. To save you the hassle and help you manage this whole thing, we created the PaginatorPlugin. The Paginator API provides two useful features:. Here is the plugin in action:.

You can think of an entity store as a table in a database, where each table represents a flat collection of entities. We created the basic building blocks of Akita. The getContact function is a mock implementation which returns the required server data with a one-second delay. First, we need to create a new provider for our contacts:.

You should already be familiar with the above code. This is the regular process of creating a factory provider in Angular. We are creating a new PaginatorPluginpassing the query we want to use in our pagination. Calling withControls will give us an array of pages so we ngFor on them and withRange which will give us the from and to values to display to the user. Now, we can use it in our component:. Paginator exposes a pageChanges observable which fires the first page immediately. Paginator expects to get the following fields as part of the response from the server in our case, the request service method :.In any application when dealing with a list or tabular data, you would probably need pagination.

We have already seen in one of our previous articles how we can implement client side pagination in AngularJs with ease. When working with asynchronous pagination, we fetch only one page of data at a time from the server. So if the user has clicked on page two we will fetch the result set only for page 2. At the client side again we will be using dir-paginate like we did for client-side pagination.

The API that returns us the data will take two parameters, the page number and items per page. So for example, if you are on your 2nd page and the items displayed per page is 10 the api should return 10 items starting from 11th position. Along with the data, the API will also return the count of total data. The total count is crucial for creating the pagination links. An alternative way is to pass the offset Position of the result from which the data should be returned instead of the page number.

The API or method used to return the paginated data would require 2 parameters for our demo. The page number for which the data is requested and the number of items per page.

The API structure would be some thing like this. Depending on the values of the itemsPerPage and pagenumber you will make appropriate request to your database. For example. Your API would look like this. And your corresponding MySQL query would be. First we need to grab the required files and set up our HTML. We need dirPagination. If you are using boweryou can download the files by running.

We have included angular. We have also included some style-sheets for a decent UI.

Angular DataTables Server side pagination & Sorting

Now lets create our Angular app. Above we have declared our angular app and controller, we have added angularUtils. Here controller as syntax is used.

Server side Pagination in Angular 2

First we are initializing a few important variables to default. Now that we have our controller setup lets complete our markup. So to repeat on the data set, we will use the dir-paginate directive instead of ng-repeat. Remember dir-paginate will use this number as reference to setup your pagination links.

Next we will add the pagination links using the dir-pagination-controls directive, which is also provided by dirPagination. The on-page-change directive is the key here, it takes in a callback function which is triggered on every page change. We will use this to call our vm. This will again make a request to the server with the new page number and our API will return the data for the next page. Take a look at our complete markup. This was it for this application, you can explore more and check out more options provided by dirPaginate here.

This type of pagination is usually required when you have a large data set. It reduces loading time and also makes you DOM much lighter.

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