{"id":21024,"date":"2018-03-06T16:15:49","date_gmt":"2018-03-06T14:15:49","guid":{"rendered":"http:\/\/www.webcodegeeks.com\/?p=21024"},"modified":"2018-04-18T16:10:26","modified_gmt":"2018-04-18T13:10:26","slug":"angularjs-dropdown-example","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-dropdown-example\/","title":{"rendered":"AngularJS Dropdown Example"},"content":{"rendered":"<p>Hello readers, in this tutorial, we will understand how to implement a <span style=\"text-decoration: underline;\">drop-down<\/span> in the angular web application. In this step-by-step approach, we\u2019ll cover how to:<\/p>\n<ul>\n<li>Bind a drop-down with the controller<\/li>\n<li>Select a value in the drop-down and pass to the angular controller<\/li>\n<li>Bind a drop-down value with the angular expression<\/li>\n<\/ul>\n<h2>1. Introduction<\/h2>\n<p><em>Angular<\/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. But before we start creating a real application using the angular library, let us see what the important parts of an angular application are.<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. The angular 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 <code>ng<\/code>. The directives consist of the following parts:<\/p>\n<ul>\n<li><code>ng-app<\/code>: The <code>ng-app<\/code> directive is a <em>starting point<\/em>. If the angular 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 angular application data to the <code>HTML<\/code> input controls<\/li>\n<li><code>ng-bind<\/code>: The <code>ng-bind<\/code> directive binds the angular application data to the <code>HTML<\/code> tags<\/li>\n<li><code>ng-options<\/code>: The <code>ng-options<\/code> directive generates a list of options and binds it to the select <code>HTML<\/code> element. The select <code>HTML<\/code> element will use the <code>ng-options<\/code> ArrayList and display it in the <code>HTML<\/code> view<\/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>. Angular 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 <em>drop-down<\/em> using the angular library.<\/p>\n<h2>2. AngularJS Dropdown Example<\/h2>\n<p>Here is a step-by-step guide for implementing the drop-down in the angular web 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_21025\" aria-describedby=\"caption-attachment-21025\" style=\"width: 301px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_structure_guide_1.jpg\"><img decoding=\"async\" class=\"size-full wp-image-21025\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_structure_guide_1.jpg\" alt=\"Fig. 1: Application Project Structure\" width=\"301\" height=\"341\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_structure_guide_1.jpg 301w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_structure_guide_1-265x300.jpg 265w\" sizes=\"(max-width: 301px) 100vw, 301px\" \/><\/a><figcaption id=\"caption-attachment-21025\" 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_21026\" aria-describedby=\"caption-attachment-21026\" style=\"width: 657px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_1.jpg\"><img decoding=\"async\" class=\"size-full wp-image-21026\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_1.jpg\" alt=\"Fig. 2: Create Maven Project\" width=\"657\" height=\"690\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_1.jpg 657w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_1-286x300.jpg 286w\" sizes=\"(max-width: 657px) 100vw, 657px\" \/><\/a><figcaption id=\"caption-attachment-21026\" class=\"wp-caption-text\">Fig. 2: Create 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_21027\" aria-describedby=\"caption-attachment-21027\" style=\"width: 598px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_2.jpg\"><img decoding=\"async\" class=\"size-full wp-image-21027\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_2.jpg\" alt=\"Fig. 3: Project Details\" width=\"598\" height=\"543\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_2.jpg 598w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_2-300x272.jpg 300w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><\/a><figcaption id=\"caption-attachment-21027\" 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_21028\" aria-describedby=\"caption-attachment-21028\" style=\"width: 597px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_3.jpg\"><img decoding=\"async\" class=\"size-full wp-image-21028\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_3.jpg\" alt=\"Fig. 4: Archetype Selection\" width=\"597\" height=\"541\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_3.jpg 597w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_3-300x272.jpg 300w\" sizes=\"(max-width: 597px) 100vw, 597px\" \/><\/a><figcaption id=\"caption-attachment-21028\" 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_21029\" aria-describedby=\"caption-attachment-21029\" style=\"width: 521px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_4.jpg\"><img decoding=\"async\" class=\"size-full wp-image-21029\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_4.jpg\" alt=\"Fig. 5: Archetype Parameters\" width=\"521\" height=\"540\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_4.jpg 521w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_ex_project_guide_4-289x300.jpg 289w\" sizes=\"(max-width: 521px) 100vw, 521px\" \/><\/a><figcaption id=\"caption-attachment-21029\" 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;AngularJsDropdown&lt;\/groupId&gt;\r\n\t&lt;artifactId&gt;AngularJsDropdown&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<h2>3. Application Building<\/h2>\n<p>Let\u2019s start building an application to understand the basic building blocks of the <em>drop-down<\/em> in the angular library.<\/p>\n<h3>3.1 Load the Angular 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=\"resource\/js\/angular_v1.6.0.js\"&gt;&lt;\/script&gt;\r\n<\/pre>\n<h3>3.2 Define the Angular application<\/h3>\n<p>Next, we will define the angular application using the <code>&lt;ng-app&gt;<\/code> and <code>&lt;ng-options&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=\"myApp\" ng-controller=\"myCtrl\"&gt;\r\n ...\r\n&lt;\/div&gt;\r\n<\/pre>\n<h3>3.3 Create the Datepicker Directive<\/h3>\n<p>The JavaScript file i.e. <code>dropdownCtrl.js<\/code> initializes the day\u2019s list and binds the list to the <code>ng-options<\/code>. This angular directive generates the list of options in the <code>HTML<\/code> select element.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>dropdownCtrl.js<\/em><\/span><\/p>\n<pre class=\"brush:js; wrap-lines:false;\">var mainApp = angular.module(\"myApp\", []);\r\n\r\nmainApp.controller(\"myCtrl\", [ '$scope', function($scope) {\r\n\r\n\t$scope.daysList = [\r\n\t                   { \"id\" : 1, \"name\" : \"Monday\" }, \r\n\t                   { \"id\" : 2, \"name\" : \"Tuesday\"}, \r\n\t                   { \"id\" : 3, \"name\" : \"Wednesday\"}, \r\n\t                   { \"id\" : 4, \"name\" : \"Thursday\"}, \r\n\t                   { \"id\" : 5, \"name\" : \"Friday\"}, \r\n\t                   { \"id\" : 6, \"name\" : \"Saturday\"},\r\n\t                   { \"id\" : 7, \"name\" : \"Sunday\"}];\r\n} ]);\r\n<\/pre>\n<h3>3.4 Complete Application<\/h3>\n<p>In this example, we have defined the <code>&lt;select&gt;<\/code> element. This element will generate a list of options using the <code>ng-options<\/code> angular directive. Do <strong>note<\/strong>, while using the angular <code>ng-options<\/code> directive in the <code>select<\/code> element, developers optionally need to define one hard-coded <code>&lt;option&gt;<\/code> with value as an empty string. This hard-coded empty string value will represent the starting value of the drop-down list. Complete the above steps to understand the usage of drop-down in an angular web application.<\/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   &lt;head&gt;\r\n      &lt;meta http-equiv=\"Content-Type\" content=\"text\/html; charset=UTF-8\"&gt;\r\n      &lt;title&gt;AngularJS Dropdown&lt;\/title&gt;\r\n      \r\n      &lt;!-- AngularJs Javascript File --&gt;\r\n      &lt;script type=\"text\/javascript\" src=\"resource\/js\/angular_v1.6.0.js\"&gt;&lt;\/script&gt;\r\n      &lt;script type=\"text\/javascript\" src=\"resource\/js\/dropdownCtrl.js\"&gt;&lt;\/script&gt;\r\n      \r\n      &lt;!-- Bootstrap Css --&gt;\r\n      &lt;link rel=\"stylesheet\" href=\"https:\/\/maxcdn.bootstrapcdn.com\/bootstrap\/4.0.0\/css\/bootstrap.min.css\"&gt;      \r\n   &lt;\/head&gt;\r\n   &lt;body&gt;\r\n      &lt;div id=\"angularDropdown\" class=\"container\"&gt;\r\n         &lt;h1 align=\"center\" class=\"text-primary\"&gt;AngularJS - Dropdown Example&lt;\/h1&gt;\r\n         &lt;hr \/&gt;\r\n         \r\n         &lt;!------ ANGULAR DROPDOWN EXAMPLE ------&gt;\r\n         &lt;div ng-app=\"myApp\" ng-controller=\"myCtrl\"&gt;         \t         \r\n            &lt;div class=\"form-group\"&gt;\r\n            \t&lt;label for=\"day\" class=\"text-success\"&gt;Select Day:&lt;\/label&gt;\r\n               \t&lt;select id=\"day\" class=\"form-control\" name=\"day\" ng-model=\"dayOfAWeek\" ng-options=\"day.name for day in daysList\"&gt;\r\n               \t\t&lt;option value=\"\"&gt;-- Select --&lt;\/option&gt;\r\n        \t\t&lt;\/select&gt;\r\n            &lt;\/div&gt;\r\n            \r\n           &lt;!------ SHOW DETAILS ------&gt;            \r\n            &lt;h6 id=\"selectedDay\"&gt;You Selected: &lt;strong&gt;{{ dayOfAWeek.name }}&lt;\/strong&gt;&lt;\/h6&gt;            \r\n         &lt;\/div&gt;\r\n      &lt;\/div&gt;\r\n   &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 tomcat 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_21030\" aria-describedby=\"caption-attachment-21030\" style=\"width: 797px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_deploy_guide_1.jpg\"><img decoding=\"async\" class=\"size-full wp-image-21030\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_deploy_guide_1.jpg\" alt=\"Fig. 6: How to Deploy Application on Tomcat\" width=\"797\" height=\"453\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_deploy_guide_1.jpg 797w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_deploy_guide_1-300x171.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_deploy_guide_1-768x437.jpg 768w\" sizes=\"(max-width: 797px) 100vw, 797px\" \/><\/a><figcaption id=\"caption-attachment-21030\" 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\/AngularJsDropdown\/\r\n<\/pre>\n<p>Server name (localhost) and port (8082) may vary as per your Tomcat configuration.<\/p>\n<figure id=\"attachment_21031\" aria-describedby=\"caption-attachment-21031\" style=\"width: 820px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_demo_guide_1.jpg\"><img decoding=\"async\" class=\"wp-image-21031\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_demo_guide_1.jpg\" alt=\"Fig. 7: Output page\" width=\"820\" height=\"160\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_demo_guide_1.jpg 849w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_demo_guide_1-300x59.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_demo_guide_1-768x150.jpg 768w\" sizes=\"(max-width: 820px) 100vw, 820px\" \/><\/a><figcaption id=\"caption-attachment-21031\" class=\"wp-caption-text\">Fig. 7: Output page<\/figcaption><\/figure>\n<p>As the user clicks on the <span style=\"text-decoration: underline;\">drop-down<\/span> element, the list will be displayed as shown below.<\/p>\n<figure id=\"attachment_21032\" aria-describedby=\"caption-attachment-21032\" style=\"width: 820px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_demo_guide_2.jpg\"><img decoding=\"async\" class=\"wp-image-21032\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_demo_guide_2.jpg\" alt=\"Fig. 8: Drop-down module in an Angular application\" width=\"820\" height=\"258\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_demo_guide_2.jpg 849w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_demo_guide_2-300x94.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/03\/angular_dropdown_project_demo_guide_2-768x242.jpg 768w\" sizes=\"(max-width: 820px) 100vw, 820px\" \/><\/a><figcaption id=\"caption-attachment-21032\" class=\"wp-caption-text\">Fig. 8: A drop-down module in an Angular application<\/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 drop-down module in the angular library. 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 <em>drop-down<\/em> in the angular library.<\/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\/03\/AngularJsDropdown.zip\" target=\"_blank\" rel=\"noopener\"><strong>AngularJsDropdown<\/strong><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Hello readers, in this tutorial, we will understand how to implement a drop-down in the angular web application. In this step-by-step approach, we\u2019ll cover how to: Bind a drop-down with the controller Select a value in the drop-down and pass to the angular controller Bind a drop-down value with the angular expression 1. Introduction Angular &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":[283],"class_list":["post-21024","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-angular-js","tag-dropdown"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>AngularJS Dropdown Example - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Hello readers, in this tutorial, we will understand how to implement a dropdown in the angular web application.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-dropdown-example\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AngularJS Dropdown Example - 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