{"id":93656,"date":"2019-06-28T10:00:15","date_gmt":"2019-06-28T07:00:15","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=93656"},"modified":"2019-06-27T11:48:53","modified_gmt":"2019-06-27T08:48:53","slug":"spring-with-rails-jquery-ujs","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2019\/06\/spring-with-rails-jquery-ujs.html","title":{"rendered":"Spring with Rails’ jQuery UJS"},"content":{"rendered":"

I\u2019ve always wanted to try to see if I could use Rails\u2019 jQuery UJS<\/a> in a Spring Boot project. The UJS in jquery-ujs stands for unobtrusive JavaScript<\/a>. I really like how UJS wires event handlers to eligible DOM elements marked with HTML5 data-*<\/code> attributes. I find myself wanting to see more of this approach being used in Spring Boot web apps. I wonder why there\u2019s very little mentioned on the web about this. Or, may be I\u2019ve been looking at the wrong places.<\/p>\n

Anyway, here are some things jQuery UJS can do, and the related source code is on GitHub<\/a> (albeit using a different example).<\/p>\n

Non-GET Links (e.g. DELETE)<\/h3>\n

When I need to render a link that deletes an item, I would use a <button><\/code> wrapped in a <form><\/code> with a hidden _method<\/code> field with a value of delete<\/code>. The <form><\/code> is not visible to the user. But the visible button is used to submit the <form><\/code>. Some CSS is used to make the button look like a link.<\/p>\n

<form action=\"\/articles\/42\" method=\"post\">\n  <input type=\"hidden\" name=\"_method\" value=\"delete\" \/>\n  <button class=\"btn btn-link\">Delete<\/button>\n<\/form><\/pre>\n
Thanks to Spring\u2019s HiddenHttpMethodFilter<\/code> (also automatically configured in Spring Boot), when this <form><\/code> is submitted, it will be received as a request with a method of DELETE<\/code>. It maps to @DeleteMapping(path=\"\/articles\/{id}\")<\/code> in the related @Controller<\/code>.<\/p>\n
While the above works, there is an easier way with jQuery UJS. All that is needed to render a link to delete an item is this:<\/p>\n
<a href=\"\/articles\/42\" data-method=\"delete\">Delete<\/a><\/pre>\n
jQuery UJS will enhance links that have data-method<\/code> attribute. When the above example link is clicked, the JavaScript will create a <form><\/code>. The action attribute of this <form><\/code> is set to the value of link\u2019s href<\/code>. The method is set to post<\/code>. A hidden _method<\/code> field is added to the <form><\/code> and set to the value of the link\u2019s data-method<\/code>. Finally, the <form><\/code> is submitted (and the link is not followed).<\/p>\n
Confirmation Dialogs<\/h3>\n
Most often than not, when it comes to deleting anything, it would be good to confirm with the user. This could be implemented as a simple dialog via window.confirm()<\/code>. If we build from the previous example, the <form><\/code> would look like this:<\/p>\n
<form action=\"\/articles\/42\" method=\"post\"\n    onsubmit=\"return confirm('Are you sure?')\">\n  <input type=\"hidden\" name=\"_method\" value=\"delete\" \/>\n  <button>Delete<\/button>\n<\/form><\/pre>\n
While the above works, jQuery UJS shows us a better way. All that is needed to confirm before deleting is this:
 
<\/div> <\/div><\/p>\n
<a href=\"\/articles\/42?delete\" data-method=\"delete\"\n    data-confirm=\"Are you sure?\">Delete<\/a><\/pre>\n
jQuery UJS will enhance links (and <form><\/code>s too) that have data-confirm<\/code> attribute. When the above example link is clicked, the JavaScript will call confirm()<\/code> to show a dialog containing the text that is the value of the attribute. If the user chooses to cancel, the creation\/submission of the <form><\/code> (due to data-method<\/code>) does not take place.<\/p>\n
Ajax Links<\/h3>\n
After deleting an item, the page usually reloads to show that the deleted element has indeed been removed.<\/p>\n
Let’s say the items are displayed in a table. Each row has a unique id<\/code>.<\/p>\n
<table>\n  <tr id=\"article:18\">\n    <!-- data cells for \/articles\/18 -->\n    <td><a href=\"\/articles\/18?delete\"\n        data-method=\"delete\" data-confirm=\"Are you sure?\">Delete<\/a><\/td>\n  <\/tr>\n  <tr id=\"article:42\">\n    <!-- data cells for \/articles\/42 -->\n    <td><a href=\"\/articles\/42?delete\"\n        data-method=\"delete\" data-confirm=\"Are you sure?\">Delete<\/a><\/td>\n  <\/tr>\n  <!-- other rows -->\n<\/table><\/pre>\n
Assuming that we can simply remove the HTML element that represented the deleted item, then we can probably send the DELETE<\/code> request asynchronously and get a response that would remove the related HTML element. jQuery UJS makes this as easy as adding data-remote=\"true\"<\/code> and some minor changes to the server-side controller.<\/p>\n
For the HTML, all we need is data-remote=\"true\"<\/code>.<\/p>\n
<a href=\"\/articles\/42?delete\" data-remote=\"true\"\n    data-method=\"delete\"\n    data-confirm=\"Are you sure?\">Delete<\/a><\/pre>\n
When the link is clicked, jQuery UJS will again send the DELETE<\/code> request. But this time, it will be sent asynchronously using Ajax. Doing so enables the browser not to reload the entire page. And depending on the server\u2019s response, can update just a portion of the page. Thus, providing a slightly better user experience.<\/p>\n
For the server-side controller, we need to send a different response when the request is expecting text\/javascript<\/code>. We add a handler method that will respond with text\/javascript<\/code> by using the produces<\/code> element of @RequestMapping<\/code>. The response will remove the related HTML element(s).<\/p>\n
\/\/ inside a @Controller\n@DeleteMapping(path=\"\/articles\/{id}\")\nString delete(... id) {\n    \/\/ ... delete article with given identifier\n    return \"redirect:\/articles\";\n}\n\n@DeleteMapping(path=\"\/articles\/{id}\",\n    produces=\"text\/javascript\")\nString delete(... id) {\n    \/\/ ... delete article with given identifier\n    return \"articles\/delete\";\n}<\/pre>\n
The view is a JSP that contains text\/javascript<\/code>. This will be executed by jQuery UJS.<\/p>\n
<%-- articles\/delete.js.jsp --%>\n<%@ page contentType=\"text\/javascript\" %>\n$('#article:${id}').remove();<\/pre>\n
Partials and Server-generated JavaScript Responses<\/h3>\n
Now what happens if we wanted to have an edit link to get some HTML content and show it up in a modal (without a page refresh)?<\/p>\n
Here’s what we can do. We send a GET<\/code> request asynchronously. The response is expected to contain JavaScript that would append the HTML in targeted places in the document, and then trigger the modal to appear.<\/p>\n
<a href=\"\/articles\/42?edit\" data-remote=\"true\">Edit<\/a><\/pre>\n
When the response is expected to be text\/javascript<\/code>, articles\/edit.js.jsp<\/code> is rendered. Otherwise, the usual articles\/edit.jsp<\/code> is rendered.<\/p>\n
\/\/ inside a @Controller\n@GetMapping(path=\"\/articles\/{id}\", params={\"edit\"})\nString edit(... id, ...) {\n    \/\/ ...\n    return \"articles\/edit\";\n}\n\n@GetMapping(path=\"\/articles\/{id}\", params={\"edit\"},\n    produces=\"text\/javascript\")\nString editViaAjax(... id, ...) {\n    \/\/ ...\n    return \"articles\/edit\";\n}<\/pre>\n
The edit.jsp<\/code> renders the <form><\/code> (a partial, not a complete HTML document) which has been refactored to its own JSP to avoid repetition.<\/p>\n
<%-- articles\/edit.jsp --%>\n<!-- -->\n  <jsp:include page=\"_form.jsp\" \/>\n<!-- --><\/pre>\n
The edit.js.jsp<\/code> renders the same <form><\/code> (a partial, not a complete HTML document) as a string in JS. Then includes it in the modal. It was tricky to render _form.jsp<\/code> as a string. I had to use <c:import><\/code>.<\/p>\n
<%-- articles\/edit.js.jsp --%>\n<%@ page contentType=\"text\/javascript\" %>\n<c:import var=\"html\" url=\"\u2026_form.jsp\" \/>\n<!-- escape double quotes and remove new lines -->\n(function() {\n  const $modal = $('#...'); \/\/ ID of modal element\n  $modal.find('.modal-body').html('${html}');\n  if (!$modal.is(':visible')) {\n    $modal.modal('show');\n  }\n})()<\/pre>\n
For this to work, another InternalResourceViewResolver<\/code> (IRVR) bean with text\/javascript<\/code> as the contentType<\/code> is configured. This bean uses the same prefix and a slightly different suffix: .js.jsp<\/code>. That way, when the request is expecting text\/javascript<\/code>, the CNVR<\/abbr> will favor using the IRVR bean with text\/javascript<\/code> and it ends up rendering articles\/edit.js.jsp<\/code>.<\/p>\n
Ajax Forms<\/h3>\n
The data-remote=\"true\"<\/code> attribute can also be applied to <form><\/code>s. With it, jQuery UJS will handle the form submission as an Ajax request. And when the form is being submitted, the buttons can be disabled by adding data-disabled-with<\/code>. For example,<\/p>\n
<form ...>\n  <!-- ... -->\n  <button data-disable-with=\"Saving...\">Save<\/button>\n<\/form ...><\/pre>\n
When the above form is submitted, jQuery UJS will disable the button and change its content to “Saving…”.<\/p>\n
Closing Thoughts<\/h3>\n
I\u2019ve barely touched the surface of Rails\u2019 jQuery UJS<\/a>. There is so much more that it can offer. I look forward to using it (and similar techniques) in my web apps.<\/p>\n
\n\n\n\n
\n
Published on Java Code Geeks with permission by Lorenzo Dee, partner at our JCG program<\/a>. See the original article here: Spring with Rails’ jQuery UJS<\/a><\/p>\n
Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
I\u2019ve always wanted to try to see if I could use Rails\u2019 jQuery UJS in a Spring Boot project. The UJS in jquery-ujs stands for unobtrusive JavaScript. I really like how UJS wires event handlers to eligible DOM elements marked with HTML5 data-* attributes. I find myself wanting to see more of this approach being …<\/p>\n","protected":false},"author":998,"featured_media":20900,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[803,209,1912,30,854,150],"class_list":["post-93656","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-javascript","tag-jquery","tag-rails","tag-spring","tag-spring-boot","tag-spring-mvc"],"yoast_head":"\nSpring with Rails' jQuery UJS - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Interested to learn about Rails' jQuery UJS? 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