Utilizes Jmesa feature as an underlying mechanism so serves managing representation of data in tabular form, filter,sort, paginate, export your. – The Export represents the export type that the user invoked. What you need to do is check to see if an export is being done. If so then just let JMesa output to the response. There are no filters to set up. You can find out.
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Running the Table With JMesa
It usually comes down to something like this:. First, we’ll add a property to the messages. Running the Table With JMesa. The Decorator and Template patterns, however, come to the rescue. This was pointed to in web. It allows sorting on any column or combination of columns.
If it is exported, the results will be written directly to the output stream of the response; if not, they’ll be rendered as a string containing our HTML table: Normally, we’d get them from a persistence service; for now, we’ll just create them in memory: We supply it with the set of items and with which JavaBean property of those items we want displayed in each column.
Adding this property to the link is easy, using the MessageFormat class to process the link argument of the application-specific subclass: Learn how to refactor a monolithic application to work your way toward a scalable and resilient microsystem.
The controller, of course, needs to interpret this new request correctly. The CoreContext has many uses; our immediate purpose for it is to retrieve a value configured in the jmesa.
What you will find here is a carefully thought out API that is very easy to use and can be modified for your own needs. We’ll start with pretty much the simplest functionality we can: I’m going to share with you some of the things I’ve found in JMesa, building up an HTML page containing a table from nothing to, well, considerably more than nothing.
Something to Display Another thing we need before we eport build a table is something to show in it. Everything is included in the download, of course.
There was a deprecated method JMesa was using that has now been removed in the lastest jQuery library. A hands-on introduction to frameworks and containers. Making a column actually, we need to have an HtmlColumn, but most columns qualify unsortable is very simple:. Don’t get me wrong: User-Friendly Format Column We continue by introducing a more user-friendly value into the format column.
We’ll start with pretty much the simplest jjmesa we can:. For page organization, not so much. The ability to customize is critical. Columns are typically sorted by property value, but we just added a column that corresponds to no property, that displays the output of the toString method.
Contribute Why not write for us? Opinions expressed by DZone contributors are their own. This is expprt one more branch on the decision tree we saw in the previous controller: That’s really all there is to it!
The select we’ve already mentioned. OK, we played around with some of JMesa’s images and CSS style sheets to make it fit in with our color scheme, but that really shouldn’t count.
Each HelloWorld item produces a formatted string within its toString method. The WebContext provides us with the servlet context path, again letting us avoid hard-coding the image URL:.
Customizing And now, to business. Join me in exploring JMesa!
All we need do is add jjmesa arbitrary value to the column properties list: Now that the apache commons BeanUtils 1. Extending AbstractContextSupport gets us JavaBean property methods for these objects just a convenience; I could have implemented the interface ContextSupport, but then I would have had to write the property methods myself. The application-specific concrete class, after all this, can be pretty simple: Many more lines of code will be needed to enable them to do useful things like paginating through long lists of items, sorting by column values, and the jemsa.
To demonstrate, we’ll use the select at the top of the form to change the number of rows displayed to 16, sort by first name ascending and last name descending by clicking on the first column header once and the second twiceand mouse over the third row to see the highlighting:. Try typing “Einstein” in the text field that appears above esport last-name column header and clicking on the filter icon the magnifying glass.