{"id":319896,"date":"2022-02-08T18:09:12","date_gmt":"2022-02-08T18:09:12","guid":{"rendered":"https:\/\/webkul.com\/blog\/?p=319896"},"modified":"2025-12-23T10:01:42","modified_gmt":"2025-12-23T10:01:42","slug":"communicating-with-backend-server-in-angular-js","status":"publish","type":"post","link":"https:\/\/webkul.com\/blog\/communicating-with-backend-server-in-angular-js\/","title":{"rendered":"Communicating with Backend\/Server in Angular JS"},"content":{"rendered":"\n<p>Communicating with Backend\/Server in Angular JS is a common requirement when building <a href=\"https:\/\/webkul.com\/blog\/angular-for-dynamic-application\/\">dynamic applications<\/a> that rely on real-time data.<\/p>\n\n\n\n<p>Angular JS enables developers to exchange data with backend systems efficiently without reloading the page.<\/p>\n\n\n\n<p>Developers commonly use Angular JS to build single-page applications where content updates dynamically based on user actions.<\/p>\n\n\n\n<p>In Angular JS, a component contains an HTML template that controls what appears on the screen.<\/p>\n\n\n\n<p>By using components, developers can create well-structured pages and reusable layouts across an application.<\/p>\n\n\n\n<p>Although Angular JS supports static HTML pages, most real-world applications rely on dynamic data fetched from backend systems.<\/p>\n\n\n\n<p>To handle this interaction efficiently, Angular JS uses AJAX to communicate with backend servers in the background.<\/p>\n\n\n\n<p>While communicating with Backend\/Server in Angular JS, developers often use AJAX-based HTTP requests to fetch and update data dynamically.<\/p>\n\n\n\n<p>This built-in AJAX support makes Angular JS a reliable choice for developing responsive single-page applications.<\/p>\n\n\n\n<div class=\"wk-index-wrap\"><div class=\"block-wrap\">\n<h2 class=\"wp-block-heading index-title\"><strong>Steps of communicating with Backend Server in Angular JS<\/strong><\/h2>\n<\/div><\/div>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Import HTTPClientModule<\/li>\n\n\n\n<li>Create a service where we will create function send http requests to the server.<\/li>\n\n\n\n<li>Create a Component and use the service functions to Get \/ Add \/ Update \/ Delete data from Angular page.<\/li>\n<\/ol>\n\n\n\n<p>We will understand the process to communicate with server with an example.<\/p>\n\n\n\n<p>So we will work on a Product. <\/p>\n\n\n\n<p><strong>We will send get \/ post \/ put \/ delete http requests to the server for:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Getting Product info from database at server side (get)<\/li>\n\n\n\n<li>Adding Product info to the database at server side (post)<\/li>\n\n\n\n<li>Updating Product info to the database at server side (put)<\/li>\n\n\n\n<li>Deleting Product from the database at server side (delete)<\/li>\n<\/ul>\n\n\n\n<p>Here at server side any server side language Or Framework could be there, which will use its process to connect with database and process data to \/ from the database.<\/p>\n\n\n\n<p>So we only set the requests from the Angular and you can use any server side code for processing the requests on server side.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<div class=\"wk-index-wrap\"><div class=\"block-wrap\">\n<h2 class=\"wp-block-heading index-title\"><strong>Setup HTTPClientModule<\/strong><\/h2>\n<\/div><\/div>\n\n\n\n<p>To use HTTPClientModule in our application, We will import the HTTPClientModule in your app.module.ts file.<br><br><strong>Import HTTPClientModule from the \u2018@angular\/common\/http\u2019 angular package.<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\">\/\/app.module.ts\n\nimport { NgModule } from &#039;@angular\/core&#039;;\nimport { AppComponent } from &#039;.\/app.component&#039;;\nimport { BrowserModule } from &#039;@angular\/platform-browser&#039;;\nimport { HttpClientModule } from &#039;@angular\/common\/http&#039;;\n\n@NgModule({\n  declarations: &#091;\n    AppComponent\n  ],\n  imports: &#091;\n    AppRoutingModule,\n    BrowserModule,\n    HttpClientModule\n  ],\n  providers: &#091;],\n  bootstrap: &#091;AppComponent]\n})\nexport class AppModule { }<\/pre>\n\n\n\n<p><strong><em>Here first we have imported HttpClientModule and the we imported HttpClientModule in imports array.<\/em><\/strong><\/p>\n\n\n\n<p><em><strong>Now we can use HTTPClientModule anywhere in our application and it is already imported in app.module.ts file.<\/strong><\/em><\/p>\n\n\n\n<div class=\"wk-index-wrap\"><div class=\"block-wrap\">\n<h2 class=\"wp-block-heading index-title\"><strong>Service Interacting with server (product.service.ts)<\/strong><\/h2>\n<\/div><\/div>\n\n\n\n<p>As mostly HTTP requests are created independent of compoments. So we will do in in a service file.<\/p>\n\n\n\n<p>Let&#8217;s describe the product.service.ts functions called in the product.component.ts<\/p>\n\n\n\n<p><strong>Now let&#8217;s create service file where we will interact with server through HTTP requests for http methods.<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\">\/\/ code for product.service.ts\n\nimport { Injectable } from &#039;@angular\/core&#039;;\nimport { Response } from &#039;@angular\/http&#039;;\nimport { Observable } from &#039;rxjs\/Observable&#039;;\nimport { Product } from &#039;.\/product&#039;;\nimport { HttpClient } from &#039;@angular\/http&#039;;\n\n@Injectable()\nexport class ProductService {\n\n    constructor(\n        private http: HttpClient) { }\n\n    \/\/ Create a get http request (get product information in json format)\n    getProduct(id: number): Observable&lt;Product&gt; {\n        return this.http.get(`$this.http_product_url\/${id}`)\n            .map((response: Response) =&gt; response.json());\n    }\n\n    \/\/ Create a post http request (post\/add product data to server)\n    addProduct(context: any) {\n        return this.http.post(`$this.http_product_url`, JSON.stringify(context))\n            .map((response: Response) =&gt; response.json());\n    }\n\n    \/\/ Create a put http request (put\/update product data to server)\n    updateProduct(id:number, context: any) {\n        return this.http.put(`$this.http_product_url\/${id}`, JSON.stringify(context))\n            .map((response: Response) =&gt; response.json());\n    }\n\n    \/\/ Create a delete http request (delete product to server)\n    deleteProduct(id: number) {\n        return this.http.delete(`$this.http_product_url\/${id}`)\n            .map((response: Response) =&gt; response.json());\n    }\n}<\/pre>\n\n\n\n<p><strong><em>So in the service we have imported HttpClient. Then we have used it in the constructor parameter with the <code>http<\/code> alias.<\/em><\/strong><br><strong><em><br>After that we have used this.http for http methods calls to the server.<\/em><\/strong><\/p>\n\n\n\n<div class=\"wk-index-wrap\"><div class=\"block-wrap\">\n<h2 class=\"wp-block-heading index-title\">Component using service methods (product.component.ts)<\/h2>\n<\/div><\/div>\n\n\n\n<p><strong>Lets create the component and call service methods from component (product.component.ts)<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\">\/\/ code for product.component.ts\nimport { Component, OnInit } from &#039;@angular\/core&#039;;\nimport { FormBuilder, Validators } from &#039;@angular\/forms&#039;;\nimport { Router, ActivatedRoute, Params } from &#039;@angular\/router&#039;;\nimport { ProductService } from &#039;.\/product.service&#039;;\n\n\/\/ Product is a model class for Products\nimport { Product } from &#039;.\/product&#039;;\n\n@Component({\n    templateUrl: &#039;product.component.html&#039;,\n    styleUrls: &#091;&#039;product.component.css&#039;]\n})\n\nexport class ProductComponent implements OnInit {\n    id_product: number;\n    productForm: any;\n\n    constructor(\n        private formBuilder: FormBuilder,\n        private route: ActivatedRoute,\n        private router: Router,\n        private productService: ProductService\n    ) {\n        \/\/ build form fields for product\n        this.productForm = this.formBuilder.group({\n            &#039;name&#039;: &#091;&#039;&#039;, &#091; Validators.required ] ],\n            &#039;reference&#039;: &#091;&#039;&#039;],\n            &#039;status&#039;: &#091;1],\n            &#039;description&#039;: &#091;],\n            &#039;units&#039;: &#091;]\n        });\n\n        \/\/ Get the id of the product from the url\n        route.params\n            \/\/ (+) converts string &#039;id&#039; to a number\n            .subscribe((params: Params) =&gt; this.id_product = +params&#091;&#039;id&#039;]);\n    }\n\n    \/\/ In this function we will fetch the product information when page is initiated\n    ngOnInit() {\n        \/\/ if we are getting id of the product from the URL then we will get information of the product from the server\n        if (this.id_product) {\n            this.productService.getProduct(this.id_product)\n            .subscribe((product: Product) =&gt; {\n                \/\/ here you will get all product information in product var\n                \/\/ do your tasks here with product information\n            },\n            error =&gt; {\n                \/\/ do your tasks here if error occurs while fetching data\n            });\n        }\n    }\n\n    \/\/ This function will be called when product form will be submitted\n    productFormSubmit() {\n        \/\/ If id_product is there in the URL then we will update the product information (PUT method)\n        \/\/ Otherwise we will add the product  (POST method)\n        this.id_product ? this.updateProduct() : this.addProduct();\n    }\n\n    \/\/ Function for adding the product (POST)\n    addProduct() {\n        let context = this.productForm.value;\n        this.productService.addProduct(context)\n            .subscribe(\n                data =&gt; {\n                    if(data.success) {\n                        \/\/ Do your things if product successfully added\n                    } else {\n                        \/\/ Do your things if product is not added\n                    }\n                }, error =&gt; {\n                    \/\/ Do your things if some error occurred in the request\n                });\n    }\n\n    \/\/ Function for updating the product (PUT)\n    updateProduct() {\n        let context = this.productForm.value;\n        this.productService.updateProduct(this.id_product, context)\n            .subscribe(\n                data =&gt; {\n                    if(data.success) {\n                        \/\/ Do your things if product successfully updated\n                    } else {\n                        \/\/ Do your things if product is not updated\n                    }\n                }, error =&gt; {\n                    \/\/ Do your things if some error occurred in the request\n                });\n    }\n}<\/pre>\n\n\n\n<p><strong>In the above example you can see we have called methods from the product.service.ts file.<\/strong><\/p>\n\n\n\n<p>We have tried to understand the process with the help of product form. So that product information can be fetched(GET), added (POST), updated (PUT) and deleted (DELETE). <\/p>\n\n\n\n<p>Lets explain http methods calls in details.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>GET method call:<\/strong> In ngOnInit(), we called this.productService.getProduct(this.id_product) for getting the information of the product from server of a specific id.<br><br><strong>productFormSubmit()<\/strong> is called when we submit the form created for the Product. And addProduct() or updateProduct() will be called according to the id_product availability.<br><\/li>\n\n\n\n<li><strong>POST method call:<\/strong> In the addProduct() function we are posting the product form data to the server through this.productService.addProduct(context). So that we can add product information in the server side.<br><\/li>\n\n\n\n<li><strong>PUT method call:<\/strong> In the updateProduct() function we are sending the product form data to the server through this.productService.updateProduct(context). So that we can update product information in the server side.<\/li>\n<\/ul>\n\n\n\n<p><strong>Likewise you an use this.productService.deleteProduct(this.product) to delete the product.<\/strong><\/p>\n\n\n\n<p>So this is how you can send requests to the server with the different http methods.<\/p>\n\n\n\n<div class=\"wk-index-wrap\"><div class=\"block-wrap\">\n<h2 class=\"wp-block-heading index-title\">Conclusion<\/h2>\n<\/div><\/div>\n\n\n\n<p>Communicating with backend servers is a core part of building dynamic single-page applications in Angular JS.<\/p>\n\n\n\n<p>By using HTTP methods and AJAX-based requests, Angular JS allows applications to exchange data with servers efficiently without reloading the page.<\/p>\n\n\n\n<p>Understanding this communication process helps developers build scalable, responsive, and maintainable applications that handle real-time data smoothly.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Communicating with Backend\/Server in Angular JS is a common requirement when building dynamic applications that rely on real-time data. Angular JS enables developers to exchange data with backend systems efficiently without reloading the page. Developers commonly use Angular JS to build single-page applications where content updates dynamically based on user actions. In Angular JS, a <a href=\"https:\/\/webkul.com\/blog\/communicating-with-backend-server-in-angular-js\/\">[&#8230;]<\/a><\/p>\n","protected":false},"author":83,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[12325,12324,12323,12326],"class_list":["post-319896","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-communicating-with-backend","tag-communicating-with-server","tag-httpclient","tag-services-in-angular-js"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Communicating with Backend\/Server in Angular JS<\/title>\n<meta name=\"description\" content=\"Communicating with Backend\/Server in Angular JS use HttpClient for interacting with server by creating Services.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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