By Chandermani Arora
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Additional resources for Angular 2 By Example
When we run our app, Angular binding starts up once the browser has rendered the raw HTML in our view. The framework then compiles this view template and, in the process, sets up the necessary binding. Next, it does the necessary synchronization between our component class and the view template that produces the final rendered output. The following screenshot depicts the transformations that happen to the view template after data binding is done for our app: We can ourselves see the untransformed view template of the app (what is shown on the left-hand side of the preceding screenshot) by removing the three *ngIf directives and the expressions assigned to them from the paragraphs below the input box and refreshing the app in the browser.
Let's look at the HTML code line that we created for the first of these event bindings. value" /> In this case, the input event of the input element is bound to an expression. value, which is the value being entered by the user. Behind the scenes, when we use this syntax, Angular sets up an event handler for the event that we are binding to. In this case, the handler updates the guess property in our component class whenever the user enters a number in the input field. There are a couple of other places in your code where the ( ) parentheses appear: These two event bindings tie the click events for the buttons on the screen to methods in our component.
The process of doing that requires us to add code that bootstraps our component. bootstrapModule(AppModule); As you can see, we are first importing the platformBrowserDynamic module from @angular/ platform-browser-dynamic. Like the import of BrowseModule in the appModule file, this import is specifically for browser-based applications. Next we add an import of our AppModule, which we have just defined. Finally, we assign platformBrowserDynamic(), which we just imported, to a constant: platform.