I have an Vaadin portlet wich supports "Multilanguage" that means if an user selects for e.g DE in the liferay portal he will get the German translation of some portlets and if he select another language the portlet will be translated to the selected language. there is a problem, the user can translate the portlet only one time , if he selects another language, the portlet keeps the translated strings of the previous language , and the portlet keeps the old language till the portlets init method is reloaded. is there a way to dynamicaly change the language of the portlets components without losing the curret users state(modifications) ?
There is a pattern for Vaadin component translation that may apply here:
Create a utility method to translate Vaadin Component's caption and description properties. Use ThreadLocal-pattern to make that look like a static method or use dependency injection to make it easier call it from everywhere.
In the translating method store the original translation key (string id) to Component.setData()
On dynamic language change call the method to re-translate the component using the Component.getData property. You can easily iterate through the whole visible UI using the ComponentContainer interface starting from the Window.
For storing multiple translation keys into data-property (for the caption and description separately) create your own class or use Map.
Note also that if you have data coming from the database, this pattern does not help and you have to solve that some other way.
Related
I am developing a JavaFX application having 5-6 different data entry forms having several fields ( 20-25) fields in each screen. Loading a related java bean manually by calling setters onto the bean and re-populating screen elements from bean data by calling getters methods is pretty cumbersome. Is there any better/flexible/time saving way to achieve the same thing.
You could use a ControlsFX PropertySheet: "The PropertySheet control is a powerful control designed to make it really easy for developers to present to end users a list of properties that the end user is allowed to manipulate."
Or FXForm2: "FXForm2 is a library providing automatic JavaFX 2.0 form generation."
I have a project which gives the user interface to create the Dynamic forms on the fly.
User can select different fields like textbox, textarea, date etc and create a model for the same.
Once the user chooses the component and creates a form, then we need to show that form at a specifies place. The form components are rendered through common jsp page which accepts pojo object and then distributes that object to our own custom created tags for input,checkbox,radio,date etc.
Issue is it takes very 10-15 seconds to render the form.
Is there a way i can create templates or say html code of created forms and store them in DB and render through them. (Provided i am able to still bind data using Spring MVC, show dropdown values, selected or saved data in the fields.)
You may want to take a look at Metawidget. It renders different forms inside a common JSP as you describe, and does not have the 10-15 second issue you are seeing.
Metawidget is Open Source, so you can examine how it works, or even use it 'as is' (it is designed to be embedded inside projects such as yours). There's a good example tutorial here: http://metawidget.org/doc/reference/en/html/ch01s03.html#section-introduction-part2-web
Better way is to create you own custom tags and remove repeated code.
This will decrease the compilation time and further decreases the loading time of the page.
In Stuts2 I am using Tiles plugin to create a layout for the website (menu, footer, header etc.) that is consistent on every page.
Now each tile is just a static HTML content.
Is it possible to make a Tile more dynamic by eg. calling a Footer action class every time the footer is to be rendered? For example: to fetch footer content from database.
If I was to do that inside every page's action class in my application this would make for a very unusable code...
So maybe it is possible from Tile perspective?
There is only one way to do what you ask with a tiles version less than 2.2.2 and that is with a "preparer".
This however is not an integration with struts2 but would mean the preparer it self will access the service layer to get the required content for the view and all that content would need to be set though tiles attributes.
With tiles versions 2.2.2 and higher:
You can use OGNL expressions within tiles attributes, this can allow access to some struts2 interaction as well as static method access. With static method access you can call a method to return a string how ever you want. Creating such a string would be on par with writing a scriptlet.
To upgrade you need to either manually override some jars to get tiles 2.2.2, or to get version three you will need to implement your own result type: How to integrate Struts 2 with Tiles 3.
I don't actually recommend either of the above methods at this time, tiles 3 is recommended but not as an excuse to do something as bad as writing a scriptlet. It would probably be better to use the s:action tag in a tile, as mentioned by David or use an Ajax method as mentioned by Jaiwo99. The reason being that both these methods keep with struts2 while the ones I presented would be unusual and be harder to maintain. Personally I would lean towards the ajax methods.
Struts2 along with the struts2-json-plugin makes creating json services very simple. Tiles is a nice system for reducing boiler plate. If ajax is used heavily the two really can compliment each other. You can make a lot of reusable ajax components, just be sure to not hard code the urls of actions. Always use the s:url tag and assign that to JS variables.
Try following code:
$('#footer').load('your/action/with/namespace');
i'm assuming your footer is with id footer, everytime you open a page, your footer action class will be called and the data can be fetched dynamically.
I have been developing an AJAX web application using GWT. I've read several blogs and forums about this question and left with no clear idea. I understand that GWT is an AJAX application, that supports only stand-alone web application. By stand-alone, I meant GWT to be a single web page that would suffice the user requirements. However the use case I have is pretty complex and I'm stuck in this use case that doesn't let me proceed.
My usecase(s) goes like this:
Usecase #1: There is an order entry form where user will enter a search string to search for a particular item. With GWT, I could display the result in a table (say celltable). However, when I click a column in the cellTable, I want the value of the column to be sent to the server and display another page that will display only the details of the selected column. I'm not sure how to accomplish this.
Usecase #2: Let's say the web application I develop is called "InventoryControl" and I have different requirements such as:
display Available stock
display Order stock
display Manufactured unit
and Using Java servlets, I could just type http://localhost/availableStock?stockId=1234 on my browser to get the "Display available stock" for the given stockId and then http://localhost:orderStock?stockId=1234 to get the "display order stock" and similarly "display manufactured unit". Is the same possible using GWT? i.e. when I type http://localhost/availableStock?stockId=1234, is it possible to read the parameter being passed and then display the corresponding page?
If these are not meant to be guaranteed by GWT, should I stick with Plain old JAVA servlets/JSP?
Thanks in advance.
Ashok - Please note, what filip suggests above does not require multiple "pages" in the sense of additional html host pages. You can build a panel holding your display of the details, and swap it into the rootpanel of your host in the onSuccess() of your rpc call. The GWT history mechanism allows you to assign anchors to these "places" and provide a mechanism to map these anchors to specific display classes in your code.
GWT already has a mechanism for handling multiple page applications. Have a look at Activities and Places. You can define each page as a place in your application, and use the GWT mechanism to go from place to place at any time. Using places also allows you to easily add tokens/query parameters to each "page", in an OO manner, without having to worry about populating/querying the URL directly. Have a good read of the link!
Is there a way to call ids that are created in html page without specifically giving wicket:id in the component. If so, how can I do that?
What I am trying to accomplish is to get access of the component to assign a default value from CMS. I could assign the default value using JS, however I need that value to be populated to Java so that I could use that in my class to update my business logic depending on the defaulted value.
As I understand it, Wicket is component oriented which means that single component (piece of HTML code) can't see all the HTML. And my guess is that at some late stage, you want to look at the whole page HTML and do something with a DOM node with a specific ID.
I'm not sure what the correct solution should be. One way is to put the value into the user's session, so it's available for each component and your business logic.