Gsp include file

Include directive Advantage of Include directive Example of include directive. Next Topic Jsp Taglib Directive. Reinforcement Learning.

R Programming. React Native. Python Design Patterns. Python Pillow. Python Turtle. Verbal Ability. Interview Questions. Company Questions. Artificial Intelligence. Cloud Computing. For example, if you have this controller:. If you have both the above mentioned layouts in place the layout specific to the action will take precedence when the list action is executed. This can be used to apply a layout to a template, URL or arbitrary section of content.

This lets you even further modularize your view structure by "decorating" your template includes. While the applyLayout tag is useful for applying layouts to external content, if you simply want to include external content in the current page you use the include tag:.

You can even combine the include tag and the applyLayout tag for added flexibility:. Finally, you can also call the include tag from a controller or tag library as a method:. The resulting content will be provided via the return value of the include tag. Although it is useful to decorate an entire page sometimes you may find the need to decorate independent sections of your site.

To do this you can use content blocks. Grails 3 integrates with the Asset Pipeline plugin to provide sophisticated static asset management. This plugin is installed by default in new Grails applications. The basic way to include a link to a static asset in your application is to use the resource tag.

This simple approach creates a URI pointing to the file. However modern applications with dependencies on multiple JavaScript and CSS libraries and frameworks as well as dependencies on multiple Grails plugins require something more powerful.

Asset Bundling using require directives. The asset-pipeline allows you to define your javascript or css requirements right at the top of the file and they get compiled on War creation. Take a look at the documentation for the asset-pipeline to get started. To have them be cached by the browser, you can set the configuration setting grails. One of the main issues with deploying a Grails application or typically any servlet-based one is that any change to the views requires that you redeploy your whole application.

If all you want to do is fix a typo on a page, or change an image link, it can seem like a lot of unnecessary work. For such simple requirements, Grails does have a solution: the grails. How does this work? The first step is to decide where the GSP files should go. The first line tells Grails that modified GSP files should be reloaded at runtime. The second line tells Grails where to load the views and layouts from. Setting "grails. Depending on the application server, these files might get overwritten when the server is restarted.

Most application servers support "exploded war deployment" which is recommended in this case. With those settings in place, all you need to do is copy the views from your web application to the external directory. On a Unix-like system, this would look something like this:. One thing to bear in mind with this technique is that every time you modify a GSP, it uses up permgen space. So at some point you will eventually hit "out of permgen space" errors unless you restart the server. So this technique is not recommended for frequent or large changes to the views.

Unlike JSP, Grails' tag library mechanism is simple, elegant and completely reloadable at runtime. Now to create a tag create a Closure property that takes two arguments: the tag attributes and the body content:. The attrs argument is a Map of the attributes of the tag, whilst the body argument is a Closure that returns the body content when invoked:.

As demonstrated above there is an implicit out variable that refers to the output Writer which you can use to append content to the response. Then you can reference the tag inside your GSP; no imports are necessary:. As demonstrated in the previous example it is easy to write simple tags that have no body and just output content. Another example is a dateFormat style tag:. The tag can then be used within a GSP as follows:. With simple tags sometimes you need to write HTML mark-up to the response.

One approach would be to embed the content directly:. Although this approach may be tempting it is not very clean. A better approach would be to reuse the render tag:. You can also create logical tags where the body of the tag is only output once a set of conditions have been met.

An example of this may be a set of security tags:. Notice how in this example we use the implicit it variable to refer to the current number. This works because when we invoked the body we passed in the current value inside the iteration:. That value is then passed as the default variable it to the tag. However, if you have nested tags this can lead to conflicts, so you should instead name the variables that the body uses:.

Here we check if there is a var attribute and if there is use that as the name to pass into the body invocation on this line:. Notice how we use the var attribute to define the name of the variable j and then we are able to reference that variable within the body of the tag. By default, tags are added to the default Grails namespace and are used with the g: prefix in GSP pages.

However, you can specify a different namespace by adding a static property to your TagLib class:. Here we have specified a namespace of my and hence the tags in this tag lib must then be referenced from GSP pages like this:.

Namespaces are particularly useful for plugins. Tags within namespaces can be invoked as methods using the namespace as a prefix to the method call:. In order to use JSP support you must ensure you have the grails-web-jsp dependency on your classpath by adding it to your build.

Besides this you have to configure Grails to scan for the JSP tld files. In production the resulting HTML file looks like Improve this question. Harry Muscle Harry Muscle 2, 3 3 gold badges 35 35 silver badges 58 58 bronze badges.

Add a comment. Active Oldest Votes. Improve this answer. The reason why files prefixed with an underscore are not compiled is because they are considered 'partials' and need to be included in other manifests if you wish to compile them.

See the Partials section in the Usage chapter of the documentation for more details: bertramdev. Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.