I'm writing an Express 4 app, and am currently using twig.js as the view engine since I find it comfortable, though I could be persuaded to change this engine.
I've done a lot of development with PHP/Laravel and have gotten used to what in that camp they call view composers. Using these I can write a composer for a particular view, whether it's a main page view, a layout which other views extend, or a partial other views include. The composer does any necessary logic to prepare whatever data the view needs, and then attaches it to the view's context so it's available during rendering.
For example, I might have a partial which shows the current user status, so if they're logged out it'll maybe have just a log in button, and if they're logged in it'll have their icon, username, and a menu to let them log out etc. The corresponding composer would check to see if a user is logged in, and if so attach the relevant data about the user to the view's context. It then doesn't matter which page includes this partial; the data will always be available without me having to remember to add that specific data to the context passed to the page's main view.
Is there some equivalent in Express? Or does it depend on the template engine I'm using?
Currently, views that are rendered using res.render() need to have their data passed in on every res.render(). If the view uses a partial template that requires certain data points, the view that uses that template will need to have that value passed in through res.render(). So in short, you always need to pass the data in regardless if the data point is required by a partial template that might be shared. When using view engines, nothing is automatically provided to the view.
Are you asking if it's possible to have some view A, that includes partial P_A and be able to pass some data to the partial that's not dependent on routing, i.e wherever you are on the site / app your partial has data bound to it (totally independent of both the route / url and view ) which you could use for your logged in status ?
if so then create your partial, let's use a navigation / menu partial:
please note that this example uses ejs for templating
<nav>
<ul>
<!-- pass the data upon call / include-->
<% for(var i = 0, len=navigation.length;i < len;i++) {%>
<li><%=navigation[i].Text%></li>
<%}%>
</ul>
</nav>
Call / Include your patial on a view
view.ejs
<%- include('nav', { navigation : [{Text : 'Items' ,href : '/' },{Text : 'People' ,href : '/names' }] } )%>
To my knowledge there is nothing like that in expressjs.
Related
I am rather new to ASP.NET MVC5. I know server side controls are not working directly in MVC, but there will be some way by which we will get similar controls in MVC5 for rapid development. Can you suggest me how can I find such controls? Can you list out all such mostly used common controls for MVC5?
Thanks in advance.
There's no concept of a "control" in MVC. There's various things that function similar to Web Form controls, but it depends on what you're trying to do.
HTML Helpers are similar in that you essentially call a function that returns rendered HTML. You can extend HtmlHelper to add your own.
Child actions function as a sort of separate request within the context of the main request. They accept parameters like an action, can do all the backend stuff an action can do (query database, etc.) and return a view rendered based on a model, like a normal view.
A partial view, in general, can function as a control as it allows you to insert a snippet of HTML somewhere.
Editor templates and display templates can be used in conjunction with Html.EditorFor and Html.DisplayFor, respectively to render a form field or some sort of HTML display for a particular property on your model.
I have an Xpages application that pulls data from another .nsf file. I have a view panel linked to a view in that db. The view has documents with several different forms in it. I want to be able to open each document in it's own form(xpage).
How do I write a computed At Runtime, open selected document using: statement that will select the correct Xpage to present the document.
If you use the Data View component instead of a View Panel, you can compute the pageName attribute, referencing the var attribute to return a different value for each row based on the document that row represents. The flexibility of the Data View component also makes it easier to make your app look more like a modern web application and less like an Excel spreadsheet. As an additional bonus, the mobile theme invokes a renderer that makes each Data View instance look like a native mobile list, so using Data Views instead of View Panels simplifies mobile development.
You have 2 options:
use "use xpage associated with form" and edit the form's property
use a SSJS formula to compute the Form. You provide a variable name in the view control var to access a view row as XSPViewEntry. If the Form is in a view column even one you don't display you use .getColumnValue otherwise getDocument.getItemValueString
Does that work for you?
Maybe this mothed can help you: Unable to get document page name for
Hope this helps
Mark
I had a similar problem today. I use only one form but 3 different xpages for associated with this form. I have 3 different document types in the view. I used rowData the get the type of the document.
try{
var v=rowData.getColumnValue("form");
if(v.indexOf("x")> -1){var page ="x.xsp"}
else if(v.indexOf("y") > -1){var page = "y.xsp"}
else{var page = "z.xsp"}
}catch(e){
var page = "x.xsp"
}
So to your view you can create a column with the value of the form and you can use it.
I have used the extension library Dynamic View control which has an event you can code to get a handle to the NotesViewEntry which was selected. See the demo database page Domino_DynamicView.xsp and the Custom Event Handler tab for an example.
Note, in 8.5.3 (I have not upgraded yet) if you add or edit the eventHandler for onColumnClick it will be added to the XPages source as an xe:eventHandler. It needs to be an xp:eventHandler to work. The way to do it is to copy the code in the source from the exiting event and delete it. Recreate the event and update the code. Then go back into the source and change the tags within the eventHandler to xp:.
I would like to make a layout with a sidebar that can have widgets from different modules. Lets say there shall always be a login widget at the top if the user isn't logged in then it shall show user info. The getting started album guide could use it to display the latest albums and so on, i hope you understand how i want to use the sidebar.
Could it be done with a config file in autoload and a small code that read that config and calls the widgets on every page load?
There are several ways of page composition in Zend Framework 2:
1. Switching between Layouts
By default, ZF2 provides you with a single layout template layout.phtml.
In real-life applications, you will probably need to have several layouts
and switch the layout for certain controller/action. In each of your layouts, you will be able to show different widgets/sidebars.
2. Partial Views
A partial view is a .phtml view template file which can be rendered by another
view template. Partial views allow to compose your page of pieces and reuse pieces
of view rendering logic across different view templates. This is accomplished through the Partial view helper.
3. Placeholder View Helper
The Placeholder is another useful view helper allowing for capturing HTML
content and storing it for later use. Thus, analogous to the Partial
view helper, it allows to compose your page of several pieces.
4. Forward Controller Plugin
With the Forward controller plugin, you are able to call an action (for example, the action rendering some widget) from another module/controller from your controller and grab the output of that action. Then you are able to incorporate that output into your page.
5. Use View Models for Page Composition
When you write action methods for the controller classes, you use the ViewModel
class as a variable container for passing the variables from controller to view template,
and for overriding the default view template name. But, actually the ViewModel class is more than just a variable container plus view template name. In fact, it is closely related to the layout and page composition.
The third big capability of the view model class is that it allows for combining several
view models in a tree-like structure. Each view model in the tree has the associated
view template name and data variables that can be passed to the view template to control
the process of rendering.
This feature is internally used by Zend Framework 2 when "combining" the layout view template and the view template associated with the controller's action method. ZF2 internally creates the view model for the layout template and assigns it with layout/layout view template name. When your controller's action method returns the ViewModel object, this object is attached as a child to the layout view model.
So, you can attach your own view models to the default view model to render the page of pieces that you want.
I am currently working on an Orchard module. This module contains an MVC application including the views. I would like to make the module as configurable as possible. One of the items that I would like the customer to configure is the way the MVC views from the module look. Part of it will be determined by the theme. But not everything. Consider the following scenario:
The module contains a view for placing an order. The view displays a form in ´normal view way´. That is field labels and input labels. But at the head of the form each customer must be able to define his own set of instructions to display. Or maybe the customer wants to put there a message for pointing the customer to some other actions.
In the most ideal way I would have a content page where the customer can put all kind of content and one specific block that is the result of the view of the module. Kind like a web part. I can´t find out if it is possible and how that is achieved.
Edit for clarification
Module creates a page like this:
TITLE
FORM
So both title and form are outputted by the module controller.
I have managed to create a layer with the condition that the url matches the page with my form.
I have added a HTML widget to this layer in the content zone with position 1 (tried 0 to).
However the pages looks like this:
TITLE
FORM
WIDGET
instead of
WIDGET
TITLE
FORM
Returning a ShapeResult from your controller action will ensure that your view is themed and benefits from widgets, which are your "kind like a web part" thingies in Orchard.
I am using Yii. I want to have a dynamic link on a layout. This dynamic link will be modified by controllers. Let's say that dynamic link uses a user's id given by controllers to perform a task.
I am thinking to use jQuery script to get user id returned by controllers then use the user id to modify a div that holds the dynamic link.
What do you think about this technique?
It seems like you want to dynamically change a link AFTER the page is rendered, with client-side JavaScript. But it makes more sense to dynamically render a different link the first time, during the server-size PHP rendering process. The controller generates the view, after all! I would get the user ID from the controller during the page request, pass the ID in to the view, and then build the link in the view dynamically on the initial page load.
If you are modifying a link in a layout (not a view), then the best thing to do is create a variable in the Controller, and set that variable with the view. Look at how Yii uses the $layout, $menu and $breadcrumbs variables to do this.
Assuming that the user is logged in and you want their ID, you can get the ID from the Yii::app() object as well, like so:
<?php echo CHtml::link('Edit user',array('user/edit','userId'=>Yii::app()->user->id)); ?>
But at that point, you can just request the user's ID in the controller, and don't need to build a link like this.
Assuming that you want a different user ID than the logged in user, pass that ID ($userId) from the controller into the view, and just do this (as Moyersy said):
<?php echo CHtml::link('Edit user',array('user/edit','userId'=>$userId)); ?>
This will build the following link (where $userId = 99999999):
Edit user
So when the linked is clicked, in the actionEdit() you now have access to the user's ID via the GET variable $_GET['userId'].
NOW, if what you want to do is change an already created link, then you would need to use jQuery. But you will need to explain in more detail why you are doing this and what is triggering the link change (a dropdown menu?).
I'm sorry, I can't understand what you are trying to do. Specifically I don't understand what a dynamic link is.
Edit:
<? echo CHtml::link('Edit user',array('user/edit','userId'=>$userId)); ?>