{"id":23737,"date":"2019-01-30T16:15:46","date_gmt":"2019-01-30T14:15:46","guid":{"rendered":"http:\/\/www.webcodegeeks.com\/?p=23737"},"modified":"2019-01-30T10:53:57","modified_gmt":"2019-01-30T08:53:57","slug":"javascript-validator-example","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/javascript\/javascript-validator-example\/","title":{"rendered":"JavaScript Validator Example"},"content":{"rendered":"<p>Greetings readers, in this tutorial, we will explore the <strong>form validations<\/strong> in the javascript language.<\/p>\n<h2>1. Introduction<\/h2>\n<p><strong>JavaScript<\/strong> is an object-oriented programming language that allows the <em>client-side scripting<\/em> to interact with a user and deliver the dynamic pages. Most web browsers including Google Chrome, Mozilla Firefox, Safari, Internet Explorer, Microsoft Edge, Opera, etc. support it. The JavaScript scripting language includes:<\/p>\n<ul>\n<li>Declaring variables<\/li>\n<li>Maintaining the retrieving values<\/li>\n<li>Defining and invoking functions<\/li>\n<li>Defining classes<\/li>\n<li>Load and use external modules<\/li>\n<li>Define event handlers<\/li>\n<li>And much more \u2026.<\/li>\n<\/ul>\n<p>[ulp id=&#8217;tCIwOngQUb3zSUuF&#8217;]<\/p>\n<h3>1.1 Advantages of JavaScript Language<\/h3>\n<p>The pros of using the JavaScript scripting language are:<\/p>\n<ul>\n<li>JavaScript is easy to learn<\/li>\n<li>It executes on client&#8217;s browser, so eliminates the server-side processing and be executed on any OS<\/li>\n<li>JavaScript can be used with any type of web page e.g. PHP, ASP.NET, Perl etc<\/li>\n<li>Web-page performance increases due to client-side execution<\/li>\n<li>JavaScript code can be minified to decrease the loading time from the server<\/li>\n<li>Many JavaScript-based application frameworks are available in the market to create Single page web applications e.g. AngularJS, ReactJS etc.<\/li>\n<\/ul>\n<h3>1.2 Disadvantages of JavaScript Language<\/h3>\n<p>The cons of using the JavaScript scripting language are:<\/p>\n<ul>\n<li>Does not have any multi-threading or multi-processing capabilities<\/li>\n<li>Does not allow the file reading and writing capabilities<\/li>\n<\/ul>\n<h2>2. JavaScript Validator Example<\/h2>\n<p>Here is a systematic guide for implementing this tutorial using the JavaScript language.<\/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 us review the final project structure if you are confused about where you should create the corresponding files or folder later!<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"384\" height=\"286\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-structure-guide-img-1.jpg\" alt=\"JavaScript Validator - Project Structure\" class=\"wp-image-23738\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-structure-guide-img-1.jpg 384w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-structure-guide-img-1-300x223.jpg 300w\" sizes=\"(max-width: 384px) 100vw, 384px\" \/><figcaption>Fig. 1: Application Project Structure<\/figcaption><\/figure><\/div>\n\n\n<h3>2.3 Project Creation<\/h3>\n<p>This section will show on 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\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"657\" height=\"690\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-guide-img-1.jpg\" alt=\"JavaScript Validator - Maven Project\" class=\"wp-image-23739\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-guide-img-1.jpg 657w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-guide-img-1-286x300.jpg 286w\" sizes=\"(max-width: 657px) 100vw, 657px\" \/><figcaption>Fig. 2: Create a Maven Project<\/figcaption><\/figure><\/div>\n\n\n<p>In the New Maven Project window, it will ask you to select the project location. By default, &#8216;Use default workspace location&#8217; will be selected. Just click on the next button to proceed.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"598\" height=\"543\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-guide-img-2.jpg\" alt=\"JavaScript Validator - Project Details\" class=\"wp-image-23740\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-guide-img-2.jpg 598w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-guide-img-2-300x272.jpg 300w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><figcaption>Fig. 3: Project Details<\/figcaption><\/figure><\/div>\n\n\n<p>Select the &#8216;Maven Web App&#8217; Archetype from the list of options and click next.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"515\" height=\"541\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-guide-img-3.jpg\" alt=\"JavaScript Validator - Archetype Selection\" class=\"wp-image-23741\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-guide-img-3.jpg 515w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-guide-img-3-286x300.jpg 286w\" sizes=\"(max-width: 515px) 100vw, 515px\" \/><figcaption>Fig. 4: Archetype Selection<\/figcaption><\/figure><\/div>\n\n\n<p>It will ask you to &#8216;Enter the group and the artifact id for the project&#8217;. We will input the details as shown in the below image. The version number will be by default: <code>0.0.1-SNAPSHOT<\/code>.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"524\" height=\"536\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-guide-img-4.jpg\" alt=\"JavaScript Validator - Archetype Parameters\" class=\"wp-image-23742\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-guide-img-4.jpg 524w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-guide-img-4-293x300.jpg 293w\" sizes=\"(max-width: 524px) 100vw, 524px\" \/><figcaption>Fig. 5: Archetype Parameters<\/figcaption><\/figure><\/div>\n\n\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;\n\t&lt;modelVersion&gt;4.0.0&lt;\/modelVersion&gt;\n\t&lt;groupId&gt;com.javascript.form.validators&lt;\/groupId&gt;\n\t&lt;artifactId&gt;Javascriptformvalidatorsexample&lt;\/artifactId&gt;\n\t&lt;version&gt;0.0.1-SNAPSHOT&lt;\/version&gt;\n\t&lt;packaging&gt;war&lt;\/packaging&gt;\n&lt;\/project&gt;\n<\/pre>\n<h2>3. Application Building<\/h2>\n<p>Let us create an application to understand the basic building blocks of this tutorial.<\/p>\n<h3>3.1 Define the HTML<\/h3>\n<p>Let us write a simple index page in the <code>Javascriptformvalidatorsexample\/src\/main\/webapp\/<\/code> folder. Add the following code to it.<\/p>\n<p><span style=\"text-decoration: underline\"><em>index.jsp<\/em><\/span><\/p>\n<pre class=\"brush:html; wrap-lines:false;\">&lt;!-- Javascript validators example --&gt;\n&lt;div id=\"code\"&gt;\n&lt;h3 class=\"text-primary\"&gt;Code Snippet&lt;\/h3&gt;\n&lt;div&gt;&nbsp;&lt;\/div&gt;\n&lt;form action=\"#\" name=\"myform\" onsubmit=\"return(validateform());\" style=\"width: 550px;\"&gt;\n\t&lt;!-- name --&gt;\n\t&lt;div class=\"form-group\"&gt;\n\t\t&lt;input type=\"text\" class=\"form-control\" id=\"name\" name=\"myname\" placeholder=\"Enter name. . . .\"&gt;\n\t&lt;\/div&gt;\n\t&lt;!-- email address --&gt;\n\t&lt;div class=\"form-group\"&gt;\n\t\t&lt;input type=\"text\" class=\"form-control\" id=\"email\" name=\"myemail\" placeholder=\"Enter email address. . . .\"&gt;\n\t&lt;\/div&gt;\n\t&lt;!-- zip-code --&gt;\n\t&lt;div class=\"form-group\"&gt;\n\t\t&lt;input type=\"text\" class=\"form-control\" id=\"zipcode\" name=\"myzipcode\" placeholder=\"Enter zipcode. . . .\"&gt;\n\t&lt;\/div&gt;\n\t&lt;!-- country --&gt;\n\t&lt;div class=\"form-group\"&gt;\n\t\t&lt;select id=\"countrydropdown\" name=\"mycountry\" class=\"form-control\"&gt;\n\t\t\t&lt;option value=\"-1\" selected&gt;Select country. . . .&lt;\/option&gt;\n\t\t\t&lt;option value=\"0\"&gt;America&lt;\/option&gt;\n\t\t\t&lt;option value=\"1\"&gt;India&lt;\/option&gt;\n\t\t\t&lt;option value=\"2\"&gt;United Kingdom&lt;\/option&gt;\n\t\t&lt;\/select&gt;\n\t&lt;\/div&gt;\n\t&lt;button type=\"submit\" class=\"btn btn-info\"&gt;Submit&lt;\/button&gt;\n&lt;\/form&gt;\n<\/pre>\n<h3>3.2 Define the JavaScript function<\/h3>\n<p>Let us write a simple javascript function that will validate the form on the submission. Add the following code to it.<\/p>\n<p><span style=\"text-decoration: underline\"><em>JavaScript function<\/em><\/span><\/p>\n<pre class=\"brush:js; wrap-lines:false;\">\/\/ Javascript function to validate the form.\nfunction validateform() {\n\tif (document.myform.myname.value == \"\") {\n\t\talert(\"Please enter name.\");\n\t\tdocument.myform.myname.style.borderColor = \"red\";\n\t\treturn false;\n\t}\n\tif (document.myform.myemail.value == \"\") {\n\t\talert(\"Please enter email address.\");\n\t\tdocument.myform.myemail.style.borderColor = \"red\";\n\t\treturn false;\n\t}\n\tif (document.myform.myzipcode.value == \"\" || isNaN(document.myform.myzipcode.value) || document.myform.myzipcode.value.length != 5) {\n\t\talert(\"Please enter zipcode.\");\n\t\tdocument.myform.myzipcode.style.borderColor = \"red\";\n\t\treturn false;\n\t}\n\tif (document.myform.mycountry.value == \"-1\") {\n\t\talert(\"Please select country name.\");\n\t\tdocument.myform.mycountry.style.borderColor = \"red\";\n\t\treturn false;\n\t}\n\treturn (true);\n}\n<\/pre>\n<h3>3.3 First application<\/h3>\n<p>Complete the above steps and save the file. Let us see the sample 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;\n&lt;html lang=\"en\"&gt;\n\n&lt;head&gt;\n    &lt;title&gt;Index Page&lt;\/title&gt;\n    &lt;meta http-equiv=\"Content-Type\" content=\"text\/html; charset=ISO-8859-1\"&gt;\n    &lt;link rel=\"stylesheet\" href=\"https:\/\/stackpath.bootstrapcdn.com\/bootstrap\/4.2.1\/css\/bootstrap.min.css\"&gt;\n&lt;\/head&gt;\n\n&lt;body&gt;\n    &lt;div class=\"container\"&gt;\n        &lt;h2 align=\"center\" class=\"text-danger\"&gt;Validators in JavaScript&lt;\/h2&gt;\n        &lt;hr \/&gt;\n\n        &lt;!-- Javascript validators example --&gt;\n        &lt;div id=\"code\"&gt;\n            &lt;h3 class=\"text-primary\"&gt;Code Snippet&lt;\/h3&gt;\n            &lt;div&gt;&nbsp;&lt;\/div&gt;\n            &lt;form action=\"#\" name=\"myform\" onsubmit=\"return(validateform());\" style=\"width: 550px;\"&gt;\n                &lt;!-- name --&gt;\n                &lt;div class=\"form-group\"&gt;\n                    &lt;input type=\"text\" class=\"form-control\" id=\"name\" name=\"myname\" placeholder=\"Enter name. . . .\"&gt;\n                &lt;\/div&gt;\n                &lt;!-- email address --&gt;\n                &lt;div class=\"form-group\"&gt;\n                    &lt;input type=\"text\" class=\"form-control\" id=\"email\" name=\"myemail\" placeholder=\"Enter email address. . . .\"&gt;\n                &lt;\/div&gt;\n                &lt;!-- zip-code --&gt;\n                &lt;div class=\"form-group\"&gt;\n                    &lt;input type=\"text\" class=\"form-control\" id=\"zipcode\" name=\"myzipcode\" placeholder=\"Enter zipcode. . . .\"&gt;\n                &lt;\/div&gt;\n                &lt;!-- country --&gt;\n                &lt;div class=\"form-group\"&gt;\n                    &lt;select id=\"countrydropdown\" name=\"mycountry\" class=\"form-control\"&gt;\n                        &lt;option value=\"-1\" selected&gt;Select country. . . .&lt;\/option&gt;\n                        &lt;option value=\"0\"&gt;America&lt;\/option&gt;\n                        &lt;option value=\"1\"&gt;India&lt;\/option&gt;\n                        &lt;option value=\"2\"&gt;United Kingdom&lt;\/option&gt;\n                    &lt;\/select&gt;\n                &lt;\/div&gt;\n                &lt;button type=\"submit\" class=\"btn btn-info\"&gt;Submit&lt;\/button&gt;\n            &lt;\/form&gt;\n        &lt;\/div&gt;\n    &lt;\/div&gt;\n    &lt;script type=\"text\/javascript\"&gt;\n\t\t\/\/ Javascript function to validate the form.\n        function validateform() {\n            if (document.myform.myname.value == \"\") {\n                alert(\"Please enter name.\");\n                document.myform.myname.style.borderColor = \"red\";\n                return false;\n            }\n            if (document.myform.myemail.value == \"\") {\n                alert(\"Please enter email address.\");\n                document.myform.myemail.style.borderColor = \"red\";\n                return false;\n            }\n            if (document.myform.myzipcode.value == \"\" || isNaN(document.myform.myzipcode.value) || document.myform.myzipcode.value.length != 5) {\n                alert(\"Please enter zipcode.\");\n                document.myform.myzipcode.style.borderColor = \"red\";\n                return false;\n            }\n            if (document.myform.mycountry.value == \"-1\") {\n                alert(\"Please select country name.\");\n                document.myform.mycountry.style.borderColor = \"red\";\n                return false;\n            }\n            return (true);\n        }\n    &lt;\/script&gt;\n&lt;\/body&gt;\n\n&lt;\/html&gt;\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\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"818\" height=\"395\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-deploy-guide-img-1.jpg\" alt=\"JavaScript Validator - Deploy Application on Tomcat\" class=\"wp-image-23743\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-deploy-guide-img-1.jpg 818w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-deploy-guide-img-1-300x145.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-deploy-guide-img-1-768x371.jpg 768w\" sizes=\"(max-width: 818px) 100vw, 818px\" \/><figcaption>Fig. 6: How to Deploy Application on Tomcat<\/figcaption><\/figure><\/div>\n\n\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 to display the application\u2019s index page as shown in Fig. 7.<\/p>\n<pre class=\"brush:plain; wrap-lines:false;\">http:\/\/localhost:8082\/Javascriptformvalidatorsexample\/<\/pre>\n<p>Server name (localhost) and port (8082) may vary as per your Tomcat configuration.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"818\" height=\"352\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-demo-guide-img-1.jpg\" alt=\"JavaScript Validator - Index page\" class=\"wp-image-23744\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-demo-guide-img-1.jpg 818w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-demo-guide-img-1-300x129.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/project-javascript-validator-demo-guide-img-1-768x330.jpg 768w\" sizes=\"(max-width: 818px) 100vw, 818px\" \/><figcaption>Fig. 7: Index page<\/figcaption><\/figure><\/div>\n\n\n<p>Users can click the submit button to display the error validations. That is all for this tutorial and I hope the article served you whatever you were looking for. Happy learning and do not forget to share.<\/p>\n<h2>6. Conclusion<\/h2>\n<p>In this section, developers learned how to create a simple application with the JavaScript language. 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 a beginner\u2019s tutorial to explore the <em>form validations<\/em> in the javascript language.<\/p>\n<div class=\"download\"><strong>Download<\/strong><br>You can download the full source code of this example here:&nbsp;<a target=\"_blank\" href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/Javascriptformvalidatorsexample.zip\"><strong>Javascriptformvalidatorsexample<\/strong><\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>Greetings readers, in this tutorial, we will explore the form validations in the javascript language. 1. Introduction JavaScript is an object-oriented programming language that allows the client-side scripting to interact with a user and deliver the dynamic pages. Most web browsers including Google Chrome, Mozilla Firefox, Safari, Internet Explorer, Microsoft Edge, Opera, etc. support it. &hellip;<\/p>\n","protected":false},"author":2162,"featured_media":920,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[82],"class_list":["post-23737","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-javascript"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JavaScript Validator Example - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Interested to learn more about JavaScript? Then check out our detailed example on JavaScript Validator! 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