{"id":22351,"date":"2018-08-06T16:15:33","date_gmt":"2018-08-06T13:15:33","guid":{"rendered":"http:\/\/www.webcodegeeks.com\/?p=22351"},"modified":"2018-08-06T12:00:41","modified_gmt":"2018-08-06T09:00:41","slug":"angularjs-call-function-on-page-load-example","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-call-function-on-page-load-example\/","title":{"rendered":"AngularJS Call Function on Page Load Example"},"content":{"rendered":"<p>Hello readers, in this tutorial, developers will learn what <em>AngularJS<\/em> is and how to call and execute AngularJS Call Function on Page Load. There are several ways to achieve this in angular applications but we will use the <code>ng-init<\/code> angular directive.<\/p>\n<h2>1. Introduction<\/h2>\n<p><em>AngularJS<\/em> is a JavaScript MVC or Model-View-Controller framework developed by Google that lets developers build well structured, easily testable, and maintainable front-end applications. Before we start with the creation of a real application using the angular framework, let us see the important parts of an angular application.<br \/>\n[ulp id=&#8217;LXJcMJZXSsqGXYW8&#8242;]<\/p>\n<h4>1.1.1 Templates<\/h4>\n<p>In angular, a <span style=\"text-decoration: underline;\">template<\/span> is an <code>HTML<\/code> with added markups. AngularJS library compiles the templates and renders the resultant <code>HTML<\/code> page.<\/p>\n<h4>1.1.2 Directives<\/h4>\n<p><span style=\"text-decoration: underline;\">Directives<\/span> are the markers (i.e. attributes) on a DOM element that tell angular to attach a specific behavior to that DOM element or even transform the DOM element and its children. Most of the directives in the angular library start with the prefix <code>ng<\/code>. Below is the list of important directives that are available in the angular library.<\/p>\n<ul>\n<li><code>ng-app<\/code>: The <code>ng-app<\/code> directive is a <em>starting point<\/em>. If the AngularJS framework finds the <code>ng-app<\/code> directive anywhere in the <code>HTML<\/code> document, it bootstraps (i.e. initializes) itself and compiles the <code>HTML<\/code> template<\/li>\n<li><code>ng-model<\/code>: The <code>ng-model<\/code> directive binds an <code>HTML<\/code> element to a property on the <code>$scope<\/code> object. It also binds the values of AngularJS application data to the <code>HTML<\/code> input controls.<\/li>\n<li><code>ng-bind<\/code>: The <code>ng-bind<\/code> directive binds the AngularJS application data to the <code>HTML<\/code> tags<\/li>\n<li><code>ng-controller<\/code>: The <code>ng-controller<\/code> directive specifies a controller in the <code>HTML<\/code> element. This controller will add behavior or maintain the data in that <code>HTML<\/code> element and its child elements<\/li>\n<li><code>ng-repeat<\/code>: The <code>ng-repeat<\/code> directive repeat a set of <code>HTML<\/code> elements for each item in a given collection<\/li>\n<\/ul>\n<h4>1.1.3 Expressions<\/h4>\n<p>An <span style=\"text-decoration: underline;\">expression<\/span> is like a JavaScript code usually wrapped inside the double curly braces such as <code>{{ expression }}<\/code>. AngularJS library evaluates the expression and produces a result.<\/p>\n<p>These new APIs make developer&#8217;s life easier, really! But it would be difficult for a beginner to understand this without an example. Therefore, let us create a simple application using the <code>ng-init<\/code> angular directive.<\/p>\n<h2>2. AngularJS Call Function on Page Load Example<\/h2>\n<p>Here is a step-by-step guide for implementing this tutorial in the angular applications.<\/p>\n<h3>2.1 Tools Used<\/h3>\n<p>We are using Eclipse Kepler SR2, JDK 8 and Maven. Having said that, we have tested the code against JDK 1.7 and it works well.<\/p>\n<h3>2.2 Project Structure<\/h3>\n<p>Firstly, let\u2019s review the final project structure if you are confused about where you should create the corresponding files or folder later!<\/p>\n<figure id=\"attachment_22352\" aria-describedby=\"caption-attachment-22352\" style=\"width: 298px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_structure_guide_1.jpg\"><img decoding=\"async\" class=\"wp-image-22352 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_structure_guide_1.jpg\" alt=\"AngularJS Call Function on Page Load - Application Project Structure\" width=\"298\" height=\"251\" \/><\/a><figcaption id=\"caption-attachment-22352\" class=\"wp-caption-text\">Fig. 1: Application Project Structure<\/figcaption><\/figure>\n<h3>2.3 Project Creation<\/h3>\n<p>This section will show how to create a Java-based Maven project with Eclipse. In Eclipse Ide, go to <code>File -&gt; New -&gt; Maven Project<\/code>.<\/p>\n<figure id=\"attachment_22353\" aria-describedby=\"caption-attachment-22353\" style=\"width: 657px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_1.jpg\"><img decoding=\"async\" class=\"wp-image-22353 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_1.jpg\" alt=\"AngularJS Call Function on Page Load - Create a Maven Project\" width=\"657\" height=\"690\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_1.jpg 657w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_1-286x300.jpg 286w\" sizes=\"(max-width: 657px) 100vw, 657px\" \/><\/a><figcaption id=\"caption-attachment-22353\" class=\"wp-caption-text\">Fig. 2: Create a Maven Project<\/figcaption><\/figure>\n<p>In the New Maven Project window, it will ask you to select project location. By default, &#8216;Use default workspace location&#8217; will be selected. Just click on next button to proceed.<\/p>\n<figure id=\"attachment_22354\" aria-describedby=\"caption-attachment-22354\" style=\"width: 598px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_2.jpg\"><img decoding=\"async\" class=\"wp-image-22354 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_2.jpg\" alt=\"AngularJS Call Function on Page Load - Project Details\" width=\"598\" height=\"543\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_2.jpg 598w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_2-300x272.jpg 300w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><\/a><figcaption id=\"caption-attachment-22354\" class=\"wp-caption-text\">Fig. 3: Project Details<\/figcaption><\/figure>\n<p>Select the &#8216;Maven Web App&#8217; Archetype from the list of options and click next.<\/p>\n<figure id=\"attachment_22355\" aria-describedby=\"caption-attachment-22355\" style=\"width: 597px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_3.jpg\"><img decoding=\"async\" class=\"wp-image-22355 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_3.jpg\" alt=\"AngularJS Call Function on Page Load - Archetype Selection\" width=\"597\" height=\"541\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_3.jpg 597w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_3-300x272.jpg 300w\" sizes=\"(max-width: 597px) 100vw, 597px\" \/><\/a><figcaption id=\"caption-attachment-22355\" class=\"wp-caption-text\">Fig. 4: Archetype Selection<\/figcaption><\/figure>\n<p>It will ask you to &#8216;Enter the group and the artifact id for the project&#8217;. We will enter the details as shown in the below image. The version number will be by default: <code>0.0.1-SNAPSHOT<\/code>.<\/p>\n<figure id=\"attachment_22356\" aria-describedby=\"caption-attachment-22356\" style=\"width: 598px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_4.jpg\"><img decoding=\"async\" class=\"wp-image-22356 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_4.jpg\" alt=\"AngularJS Call Function on Page Load - Archetype Parameters\" width=\"598\" height=\"537\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_4.jpg 598w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_guide_4-300x269.jpg 300w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><\/a><figcaption id=\"caption-attachment-22356\" class=\"wp-caption-text\">Fig. 5: Archetype Parameters<\/figcaption><\/figure>\n<p>Click on Finish and the creation of a maven project is completed. If you see, it has downloaded the maven dependencies and a <code>pom.xml<\/code> file will be created. It will have the following code:<\/p>\n<p><span style=\"text-decoration: underline;\"><em>pom.xml<\/em><\/span><\/p>\n<pre class=\"brush:xml; wrap-lines:false;\">&lt;project xmlns=\"http:\/\/maven.apache.org\/POM\/4.0.0\" xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\" xsi:schemaLocation=\"http:\/\/maven.apache.org\/POM\/4.0.0 http:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd\"&gt;\r\n\t&lt;modelVersion&gt;4.0.0&lt;\/modelVersion&gt;\r\n\t&lt;groupId&gt;com.angular&lt;\/groupId&gt;\r\n\t&lt;artifactId&gt;AngularJsPageLoad&lt;\/artifactId&gt;\r\n\t&lt;version&gt;0.0.1-SNAPSHOT&lt;\/version&gt;\r\n\t&lt;packaging&gt;war&lt;\/packaging&gt;\r\n&lt;\/project&gt;\r\n<\/pre>\n<p>Let\u2019s start building the application!<\/p>\n<h2>3. Application Building<\/h2>\n<p>Let\u2019s create an application to understand the basic building blocks of this tutorial.<\/p>\n<h3>3.1 Load the AngularJS framework<\/h3>\n<p>Since it is a pure JavaScript framework, we should add its reference using the <code>&lt;script&gt;<\/code> tag.<\/p>\n<pre class=\"brush:js; wrap-lines:false;\">&lt;script type=\"text\/javascript\" src=\"https:\/\/ajax.googleapis.com\/ajax\/libs\/angularjs\/1.7.2\/angular.min.js\"&gt;&lt;\/script&gt;\r\n<\/pre>\n<h3>3.2 Define the AngularJS application<\/h3>\n<p>Next, we will define the AngularJS application using the <code>&lt;ng-app&gt;<\/code>, <code>&lt;ng-controller&gt;<\/code> and <code>&lt;ng-init&gt;<\/code> directives.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>index.jsp<\/em><\/span><\/p>\n<pre class=\"brush:html; wrap-lines:false;\">&lt;div ng-app=\"app\" ng-controller=\"myctrl\" ng-init=\"init()\"&gt;\r\n ...\r\n&lt;\/div&gt;\r\n<\/pre>\n<h3>3.3 Complete Application<\/h3>\n<p>In this example, we will use the <code>ng-init<\/code> angular directive to call and execute a function on the page load. To illustrate this example, we are displaying an alert box on the page load, but developers can modify the code as per the business requirement. Complete the above steps and I will show you how to use the <code>ng-init<\/code> angular directive to set the focus on the input box with real-life practices. Let\u2019s see the code snippet.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>index.jsp<\/em><\/span><\/p>\n<pre class=\"brush: html; wrap-lines:false;\">&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n\t&lt;head&gt;\r\n\t    &lt;meta http-equiv=\"Content-Type\" content=\"text\/html; charset=UTF-8\"&gt;\r\n\t    &lt;title&gt;AngularJS Pageload&lt;\/title&gt;\r\n\t\t\r\n\t    &lt;!-- AngularJs File --&gt;\r\n\t    &lt;script type=\"text\/javascript\" src=\"https:\/\/ajax.googleapis.com\/ajax\/libs\/angularjs\/1.7.2\/angular.min.js\"&gt;&lt;\/script&gt;\r\n\t    \r\n\t    &lt;!-- Bootstrap Css --&gt;\r\n\t    &lt;link rel=\"stylesheet\" href=\"https:\/\/stackpath.bootstrapcdn.com\/bootstrap\/4.1.2\/css\/bootstrap.min.css\"&gt;\r\n\t    \r\n\t    &lt;script type=\"text\/javascript\"&gt;\t    \t\r\n\t\t    var myapp = angular.module('app', []);\r\n\t\t    myapp.controller('myctrl', ['$scope', function ($scope) {\r\n\t\t    \t\r\n\t    \t\t$scope.init = function() {\r\n\t\t\t\t \talert(\"Angularjs call function on page load.\");\r\n\t  \t\t\t};\r\n\t\t    }]);\r\n\t    &lt;\/script&gt;\r\n\t&lt;\/head&gt;\r\n\t&lt;body&gt;\r\n\t    &lt;div id=\"angularPageload\" class=\"container\"&gt;\r\n\t        &lt;h1 align=\"center\" class=\"text-primary\"&gt;AngularJS - Call Function on Pageload&lt;\/h1&gt;\r\n\t        &lt;hr \/&gt;\r\n\t        \r\n\t        &lt;div ng-app=\"app\" ng-controller=\"myctrl\" ng-init=\"init()\"&gt;\r\n\t        \t&lt;h3&gt;Angularjs call function on page load&lt;\/h3&gt;              \r\n\t        &lt;\/div&gt;\r\n\t    &lt;\/div&gt;\r\n\t&lt;\/body&gt;\r\n&lt;\/html&gt;\r\n<\/pre>\n<h2>4. Run the Application<\/h2>\n<p>As we are ready for all the changes, let us compile the project and deploy the application on the Tomcat7 server. To deploy the application on Tomat7, right-click on the project and navigate to <code>Run as -&gt; Run on Server<\/code>.<\/p>\n<figure id=\"attachment_22357\" aria-describedby=\"caption-attachment-22357\" style=\"width: 772px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_structure_deploy_guide_1.jpg\"><img decoding=\"async\" class=\"wp-image-22357 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_structure_deploy_guide_1.jpg\" alt=\"AngularJS Call Function on Page Load - Deploy Application on Tomcat\" width=\"772\" height=\"412\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_structure_deploy_guide_1.jpg 772w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_structure_deploy_guide_1-300x160.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_structure_deploy_guide_1-768x410.jpg 768w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example_project_structure_deploy_guide_1-620x330.jpg 620w\" sizes=\"(max-width: 772px) 100vw, 772px\" \/><\/a><figcaption id=\"caption-attachment-22357\" class=\"wp-caption-text\">Fig. 6: How to Deploy Application on Tomcat<\/figcaption><\/figure>\n<p>Tomcat will deploy the application in its web-apps folder and shall start its execution to deploy the project so that we can go ahead and test it in the browser.<\/p>\n<h2>5. Project Demo<\/h2>\n<p>Open your favorite browser and hit the following URL. The output page will be displayed.<\/p>\n<pre class=\"brush:plain; wrap-lines:false;\">http:\/\/localhost:8082\/AngularJsPageLoad\/<\/pre>\n<p>Server name (localhost) and port (8082) may vary as per your Tomcat configuration.<\/p>\n<figure id=\"attachment_22360\" aria-describedby=\"caption-attachment-22360\" style=\"width: 816px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example-demo-guide-1_1.0.jpg\"><img decoding=\"async\" class=\"wp-image-22360 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example-demo-guide-1_1.0.jpg\" alt=\"AngularJS Call Function on Page Load\" width=\"816\" height=\"142\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example-demo-guide-1_1.0.jpg 816w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example-demo-guide-1_1.0-300x52.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/angularjs-pageload-example-demo-guide-1_1.0-768x134.jpg 768w\" sizes=\"(max-width: 816px) 100vw, 816px\" \/><\/a><figcaption id=\"caption-attachment-22360\" class=\"wp-caption-text\">Fig. 7: AngularJS Page Load Example<\/figcaption><\/figure>\n<p>That\u2019s all for this post. Happy Learning!!<\/p>\n<h2>6. Conclusion<\/h2>\n<p>In this section, developers learned how to create a simple angular application to execute a function on the page load. Developers can download the sample application as an Eclipse project in the <a href=\"#projectDownload\">Downloads<\/a> section.<\/p>\n<h2><a name=\"projectDownload\"><\/a>7. Download the Eclipse Project<\/h2>\n<p>This was an example of calling and executing a function using the <code>ng-init<\/code> angular directive in the AngularJS framework.<\/p>\n<div class=\"download\"><strong>Download<\/strong><br \/>\nYou can download the full source code of this example here: <a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/07\/AngularJsPageLoad.zip\" target=\"_blank\" rel=\"noopener\"><strong>AngularJsPageLoad<\/strong><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Hello readers, in this tutorial, developers will learn what AngularJS is and how to call and execute AngularJS Call Function on Page Load. There are several ways to achieve this in angular applications but we will use the ng-init angular directive. 1. Introduction AngularJS is a JavaScript MVC or Model-View-Controller framework developed by Google that &hellip;<\/p>\n","protected":false},"author":2162,"featured_media":909,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[48,520,519,266],"class_list":["post-22351","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-angular-js","tag-angular","tag-angular-1","tag-angular-js","tag-angularjs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>AngularJS Call Function on Page Load Example - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Interested to learn more about AngularJS? Then check out our detailed example on AngularJS Call Function on Page Load! 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