how to generate qr code in asp.net core

how to generate qr code in asp net core

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To pull this off, we re borrowing a couple of methods from the DOM2 Events spec. Internet Explorer doesn t support these events natively, but we can fake it on the fly augmenting Internet Explorer s event object with instance methods the same way we augment DOM nodes with instance methods. First, we add an event argument to our handler so that we can use the event object. (We could have done this from the start, but we didn t have a use for it until just now.) Then, at the end of the handler, we tell the event not to do what it had originally planned.

app/models/ app/controllers/ app/helpers/ app/views/account test/functional/ test/unit/ app/models/user.rb app/controllers/account_controller.rb lib/authenticated_system.rb lib/authenticated_test_helper.rb test/functional/account_controller_test.rb app/helpers/account_helper.rb test/unit/user_test.rb test/fixtures/users.yml app/views/account/index.rhtml app/views/account/login.rhtml app/views/account/signup.rhtml db/migrate db/migrate/001_create_users.rb

function submitEntryForm(event) { var updater = new Ajax.Updater({ success: 'breakfast_history', failure: 'error_log' }, 'breakfast.php', { parameters: { food_type: $('food_type').value, taste: $('taste').value } }); event.preventDefault(); }

<script> function show_report(){ $('chart').hide(); var player_id = $('player_id').value; var game_id = $('game_id').value if( player_id && game_id ) { new Ajax.Updater("chart", '/performance'+ '/' + $('game_id').value + '/' + $('player_id').value, {evalScripts:true, method:'get', onComplete:function(){ setTimeout("$('chart').show();", 400); } } ); } } Event.observe("player_id", "change", show_report); Event.observe("game_id", "change", show_report); </script>

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Prototype gives you two other methods to control the flow of events: Normally, events start deep in the DOM tree and bubble up to the top (e.g., clicking a table cell will also fire an event in that cell s table row, in the table body, in the table, in the table s parent node, and so on all the way up to window). But you can halt the bubbling phase using the stopPropagation method. When you need to stop the event from bubbling and prevent the default action, use Prototype s custom stop method. It s a shortcut for calling both stopPropagation and preventDefault. OK, let s try one more time. Reload index.html and try to submit a breakfast log (see Figure 5-6).

This JavaScript code defines a new function, show_report, and then uses Prototype s Event.observe function to run the show_report function whenever either of the drop-down lists changes. The show_report button hides the existing chart, and then checks if both a player and game were selected. If neither or just one of them was selected, then the routine does nothing. If both are selected, then it uses Ajax.Updater to call the show method of the Performance controller, passing it both the ID of the selected game and the ID of the selected player. (Note that you don t need to specify explicitly that it s the show action, because you defined an appropriate route in your routes.rb file.) The Ajax.Updater call has three important optional parameters passed to it: The first is evalScripts, which ensures that JavaScript code passed by the Performance controller is executed. By default, code retrieved by Ajax.Updater is not executed. The second is the method parameter. By default, Ajax.Updater uses a POST request, and since this is a read-only request that does not affect the state of the database, it should be a GET request.

Since we re going to want to make it easy for people to sign up for the application themselves (otherwise, we d have to manually create accounts for all new users and that just doesn t fit into my plans for doing less overtime work). To support this, we ll want to configure the mailer functionality of Acts as Authenticated as well. Generate the necessary mailer models and views by running this authenticated mailer generator: ruby script/generate authenticated_mailer user exists create exists create create create create create app/models/ app/views/user_notifier test/unit/ app/models/user_notifier.rb app/models/user_observer.rb test/unit/user_notifier_test.rb app/views/user_notifier/activation.rhtml app/views/user_notifier/signup_notification.rhtml

Figure 5-6. Finally, we can submit meal information without having to reload the page! Eureka!

The third is a callback, onComplete, which will run when Ajax.Updater has finished updating the control. This is a small fix for a bug in the Flash Object plug-in, which results in a You do not have Flash installed message appearing while the page is loading. To avoid the problem, you wait 400 milliseconds to redisplay the chart component. Next, let s take a look at the Performance controller (Listing 5-12):

As you may have noticed in the text that flew by while running those commands, Acts as Authenticated created a new controller (account_controller), several views, and, of particular note, a few models for us (User, User Notifier, and User Observer). In order for that User model to be active, we re going to need to run a rake db:migrate command to load the database structure from the migration file it created. But before we can do that, we need to make a few minor modifications to support our application s needs.

That was easy, right Right Be aware: The behavior layer of web development (JavaScript) is far more complex than the structural layer (HTML) or the presentational layer (CSS). Ordinary web pages

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