Documentation & fixes

Hello there.
Big update today since this release introduces a dogfooded documentation for the package:

Next to this here are the fixes:

• Iframe attributes have been added
• Fixed crash when using Javascript function New and Call with interface{}
• manifest.json has been renamed manifest.webmanifest in order to follow Google PWA guidelines

This release also introduces some experimental widgets that are layout related:

• Stack
• Flow
• Shell

Those widgets are used in the documentation introduced above. Since they are experimental, their API may change.

Bug fixes

Hello,

This version provides the following changes:

• Fixed a bug where boolean attributes were not updated
• Min() and Max() HTML element functions now take an interface{} argument rather than string

Ads.txt Proxy fixes

Hello,

Here is a small release that brings the following:

• The handler now proxy an ads.txt file that is located at the root of the static files directory. This allows complying with AdSense requirements.
• app.Input().Step(v int) has been changed to app.Input().Step(v float64) since step can be a decimal value.

Fixes and improvements

Hello,

Here is v7.0.3 which introduces the following changes:

• Fixed bug that did not remove event handlers when components were dismounted
• Refactored how scripts are loaded in the Handler by using defer attribute
• Added Iframe missing attributes
• Generated GitHub pages are now installable with Chrome

# How to update:
go get -u github.com/maxence-charriere/go-app/v7

Version 7

Hello there,
I'm thrilled to release version 7 of go-app.

This version is focused on internal improvements that improve code quality and maintainability. Unfortunately, those improvements bring a few small changes in the API, which is why there is a version bump.

What is new?

• Context that is bound to a UI element lifecycle. The context can be used with functions that accept context.Context. Contexts are canceled when the UI element they are bound with is dismounted. It is passed in Mounter and Navigator interfaces, and event handlers.

• TestMatch: testing api to unit test specific UI element:

  tree := app.Div().Body(
      app.H2().Body(
          app.Text("foo"),
      ),
      app.P().Body(
          app.Text("bar"),
      ),
  )
  
  // Testing root:
  err := app.TestMatch(tree, app.TestUIDescriptor{
      Path:     TestPath(),
      Expected: app.Div(),
  })
  // OK => err == nil
  
  // Testing h2:
  err := app.TestMatch(tree, app.TestUIDescriptor{
      Path:     TestPath(0),
      Expected: app.H3(),
  })
  // KO => err != nil because we ask h2 to match with h3
  
  // Testing text from p:
  err = app.TestMatch(tree, app.TestUIDescriptor{
      Path:     TestPath(1, 0),
      Expected: app.Text("bar"),
  })
  // OK => err == nil

• Support for aria HTML element property: Fix #419

  app.Div().
      Aria("foo", "bar").
      Text("foobar")

• A default logger can be set

• go-app PWA can now be deployed a GitHub Page with the help of GenerateStaticWebsite function:

  package main
  
  import (
      "fmt"
  
      "github.com/maxence-charriere/go-app/v7/pkg/app"
  )
  
  func main() {
      err := app.GenerateStaticWebsite("DST_DIR", &app.Handler{
    	  Name:      "Github Pages Hello",
    	  Title:     "Github Pages Hello",
    	  Resources: app.GitHubPages("goapp-github-pages"),
      })
  
      if err != nil {
    	  fmt.Println(err)
    	  return
      }
  
      fmt.Println("static website generated")
  }

  It generates files that can directly be dropped into a GitHub repository to serve the PWA.
  See live example: https://maxence-charriere.github.io/goapp-github-pages/

• Support for robots.txt: A robots file is now served by the Handler when /web/robots.txt exists

• Internal code refactored to be more maintainable

• Serving static resources can now be customized by implementing the ResourceProvider interface

How to migrate from v6 to v7

go-app v7 mainly introduced internal improvements. Despite trying to keep the API the same as v6, those changes resulted in API minor modifications that break compatibility.

Here is a guide on how to adapt v6 code to make it work with v7.

Imports

Go import instructions using v6:

import (
    "github.com/maxence-charriere/go-app/v6/pkg/app"
)

must be changed to v7:

import (
    "github.com/maxence-charriere/go-app/v7/pkg/app"
)

http.Handler

• RootDir field has been removed.
  Handler now uses the Resources field to define where app resources and static resources are located. This has a default value that is retro compatible with local static resources. If static resources are located on a remote bucket, use the following:

  app.Handler{
      Resources: app.RemoteBucket("BUCKET_URL"),
  }

• UseMinimalDefaultStyles field has been removed.
  go-app now use CSS styles that only apply to the loading screen and context menus. The former default styles have been removed since they could conflict with some CSS frameworks.

Component interfaces

Some interfaces to deals with the lifecycle of components have been modified to take a context as the first argument. Component with methods that satisfies the following interfaces must be updated:

• Mounter: OnMount() become OnMount(ctx app.Context)
• Navigator: OnNav(u *url.URL) become OnNav(ctx app.Context u *url.URL)

Event handlers

EventHandler function signature has been also modified to take a context as the first argument:

• func(src app.Value, e app.Event) become func(ctx app.Context, e app.Event)

• Source is now accessed from the context:

  // Event handler that retrieve input value when onchange is fired:
  func (c *myCompo) OnChange(ctx app.Context, e app.Event) {
      v := ctx.JSSrc().Get("value")
  }

Fix manual Navigation

Summary

• Navigate does not trigger a page reload anymore when called manually.

Thanks to @jwmach1 and @walgenbach for reporting this.

Fix component update bug

Summary

• Fixes a bug that always triggered a component replacement when its root was another component

Crash Fixe and Indirect function exported

Summary

• Fixes a crash that occurred when a component was the root of another component
• Indirect is now exported
• The Updatable interface has been removed: code will compile but OnUpdate functions are not called anymore. This is removed because I felt it complicate components life cycle and was buggy.

Clean body and fix hash navigation

Hello,
I'm glad to release the version 6.5.0.

Clean body

go-app now provides the function CleanBody. This is to remove extra elements in the body that might be added by third-party libraries.

While building an app, I ran into a problem where Amazon advertisements where popping into the screen when navigating fast to other pages. The problem was that Amazon is loading a script to display their ads. When the loaded code does not find the ad container (when a component is dismounted), it inserts the ads directly in the body.

This is to prevent this kind of behavior from third-party libraries.

Bug Fixes

Some code has been refactored and hash navigation (eg. http://my.domain/hello#Input) now works properly.

Improve stability

Hello there,
This version brings some stability improvements:

• nil values are now ignored when they are put in an element body
• Component updates are now properly skipped when a component is dismounted or when the update is done from the same pointer
• OnNav from the Navigator interface is now propagated to all components