I want to build a large application in Dart using material design. To accomplish this I included paper_elements into my project. My problem is, that I can't think of a good way to build my multi page application with paper_elements. Usually I create objects which would create their elements inline and add / remove themselves to the dom. The way I understand the paper_element tutorials I found so far this is not possible with them.
Is there a simple way to use paper_elements in dart while having an object based structure? For example I would have my application which loads either a register or login object and displays it in the browser. When logging in it should load a menu object which displays a menu and so on. All page changes should happen without a page reload.
I'm looking forward to all help, examples or links you could provide regarding my problem.
Cheers,
Tim
In Dart you normally build the app as SPA (single page application) without reload.
You can add remove a paper-element like normal DOM elements (div, input, ...) querySelector('#placeholder').append(new Element.tag('paper-input'));
You can also use <template if="{{}}"> or <template repeat="{{}}"> to make Polymer auto-insert these elements when certain conditions are fulfilled or for each value in a collection.
Your question isn't very specific but I guess all you need is already available here on SO as Q/A. Just search for [dart-polymer]. If you don't find anything just ask and we point you in the right direction.
a few that might be relevant
Dart Language: Polymer - Working with views
How to update polymer element bindings after it was removed from DOM and inserted again
How to add attributes to a dynamically created component
how to implement a main function in polymer apps (you don't need a main() when you use a polymer-element that acts as a container for your entire application)
Is imperative Mustache-Binding in Polymer.dart supported?
Related
I am using in my Nativescript Angular app the nativescript-google-maps-sdk plugin which works great.
My issue is that I want to use cached images to display in a custom InfoWindow. For this purpose I am using the nativescript-web-image-cache plugin app-wide. When I use the regular <WebImage> tag in the infoWindow it complains that it is not a registered component:
Module 'ui/web-image' not found for element 'WebImage'
Everywhere else in the app it works just fine. In this issue is it suggested that:
that InfoWindowTemplate content is parsed as Vanilla NativeScript XML, not as Angular XML thus it is not able to find custom Angular Component you created
So the question is how can I still use this plugin? Is there a way I can somehow register the <WebImage> component so it will work in the custom InfoWindow?
Just to make sure there is not another issue, I added the nativescript-web-image-cache plugin to the plain NativesScript nativescript-google-maps-sdk demo project and then the <WebImage> tag works just fine.
Any pointers are highly appreciated!
Anything registered in Angular is not available in Core the same way; so if you have to create a core template; you must also pass in the xmlns:blah="ns-blah" as part of the core template, so that it is registered properly in that core template. The angular registerElement does not do anything for Core. Now you can easily do <IC:WebImage xmlns:IC="nativescript-web-image-cache" ...> and then it is valid in the template. However, I would recommend you put the xmlns:IC on the topmost element you can; as it makes reading the code a lot simpler. But in cases you don't have a parent wrapping element around the item, this is valid code to register it on the same element using it.
NS-Core templates are different than NS-Angular templates; if you attempt to use things that work in Angular like <IC:WebImage [param]="value" (param)="value"/> both the [param] and (param) will totally break template parsing in core. NS-Core's parser is like HTML, nothing is supposed to surround the param and the value should be in quotes. The value can have {{ boundvalue }} to bind a dynamic value into the template.
Normally when passing a NS-Core template into whatever function you need; you want to pass in just the minimal parts; you rarely need to use things like <Page>, <Frame> or any other top level elements. In fact this can cause problems. You normally need just the piece of the layout you are going to have it view. So in this case <StackLayout xmlns:IC=...><IC:WebImage...></StackLayout>
Finally when troubleshooting using Core features in Angular; I highly recommend you put fixed Width/Height and Background colors on each element. This can sometimes show you what is failing.
As InfoWindowTemplate content is parsed as Vanilla NativeScript XML, you could add xmlns:IC="nativescript-web-image-cache" to the root / parent element of your component. Also use <IC:WebImage> instead of WebImage.
I'm in the process of creating my first NativeScript Angular app and it consists of a form that will need to span across multiple screens.
I tried to be creative and add the form pages into slides using TheOriginalJosh/nativescript-slides. This actually worked out beautifully as I was able to slide to each form page smoothly.
But a problem started to arise when initially navigating to the form component as it started to take a few seconds to load. I'm assuming this was happening because the form spans across 10 pages with multiple GridLayouts in each slide. I thought about using TabView but I wouldn't need the menu portion of it and I'm worried it will cause the same issue with loading speed.
So what is the best way to implement this?
Should I just create 10+ form components, use a universal service and just route each form part to another or is there a better way to "encapsulate" this into one component without any performance loss?
I also saw in the NativeScript documentation about this..
It is possible to nest <router-outlet> component inside <page-router-outlet> or another
<router-outlet>
But there isn't any documentation on how to implement this.
There are many way to use nested router-outlet in ns, and in a very big project, it is best to use shared modules architecture, which enable a module nested in another, so the view can be nested too.
Here is my nativescript sample with nested using shared modules architecture :
in profile is nested in app.component.
in parent view:
https://github.com/Arthurisme/auth0-iosmorphic/blob/master/Mobile/Nativescript-for-Spring-Auth0/app/app.component.ts
in childview:
https://github.com/Arthurisme/auth0-iosmorphic/blob/master/Mobile/Nativescript-for-Spring-Auth0/app/profile/profile.component.html
I started developing a desktop-class application using Electron, and am referring to the starter app as well as the Electron API demo app. This application has a single screen with multiple sections. Interaction within one particular section can cause other section(s) to get updated. These interactions must be in sync with an underlying model [object]; two-way data binding could be helpful here.
What is a recommended way to achieve a multi-section window with each section interacting with one another? Should I compose the layout using DIVs and CSS, or is there a library that I can use effectively with Electron? I was thinking about Handlebars or Jade but I am not sure if I need a template engine, as the entire screen is not rendered and only particular sections will be updated.
The tutorials and example I've seen are all single page application.
Can anyone give an idea or point to a resource showing how a multiple page app can be developed with CanJS?
You should be able to create a new page in whatever app framework you are using or even just static pages, and then hookup your new control and view to any element on that new page.
You want to have a separate control for each module, so you might have separate controls even on a single page if you have, for example, a filterable dropdown list, a todo list, and a login. So, in your canjs directory for your app you will have separate sub-directories for each module which will contain your control, view/s, model/s, and observe/s and unit tests. This makes them re-usable, easier to test, and since they are modular if one part of your app breaks it won't take down all functionality. Once you get the hang of that incorporate AMD style loading of your assets with stealJS which is made by Bitovi - the CanJS creators.
https://github.com/bitovi/steal
If you want to manipulate the location.hash without actually changing pages or manaage browser history and client state you should check out can.route:
http://canjs.com/docs/can.route.html
As I'm learning about Sammy.js I read that you can have several Sammy.js applications in the same page, each bound to a different element (i.e. div). I would like to understand why would this be useful.
I read in another post that only forms inside a bound element will trigger the route change, I'm thinking this could be used to modularize your application. Is there another use case beside this? Could you provide an example of how to modularize your application in this way?
We implemented a component similar to Sammy in our Silverlight application some time ago. The similarity is in that both represent a kind of a simple browser that can be bound to a UI region. The approach gave us several benefits:
We had an extensible way to add new content implementations. I mean that we could add plugins to our app that contained new forms/views which the application core had no knowledge about.
We could easily implement composite views, e.g. dashboard that were able to show any view implemented in any module. Including themselves. (A-ha, we had created recursive dashboards that worked until the app hit the memory limit. Kind of Inception. :))
Sammy can be used to reach these goals as well.
However, you must understand that from all Sammy applications running on a page, only one can be bound to the browser location bar. Others will have their location visible only to javascript, or you'll need to render location bars for them on the page.