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Lecture15_LaravelGetStarted_SPring2023.pdf
- 1. Laravel Blade Template IS333 Web based information systems By. Shaimaa Mohamed Galal
- 2. What is template engine? • Used to code “View” web application pages. • Template engines are used when you want to rapidly build web applications that are split into different components. • Templates also enable fast rendering of the server- side data that needs to be passed to the application. • For example, you might want to have components such as body, navigation, footer, dashboard, etc.
- 3. Blade: Laravel template engine Code is rendered to PHP in the storage folder Original View pages
- 4. Advantages of Laravel Blade Template The Blade is a powerful templating engine in a Laravel framework that provides: • Clean code (easy to use and readable). • Separation of business logic and UI. • Inheritance. • Easy for Non-PHP front end developers. • Provide many built in features such as Auto escaping. • Auto-escaping via avoiding Cross-Site Request Forgery (CSRF) ✓ CSRF is an attack that forces an end user to execute unwanted actions on a web application in which they’re currently authenticated. ✓ An attacker may trick the users by sending a link via email or chat and end with executing actions of the attacker’s choosing. ✓ A successful CSRF attack can force the user to perform state changing requests like transferring funds, changing their email address..etc.
- 5. Blade Features • The blade templating engine provides its own structure such as conditional statements and loops. • To create a blade template, create a view file and save it with a .blade.php extension instead of .php extension. • The blade templates are stored in the /resources/view. • The blade templates are rendered to PHP /storage/framework/view directory. • The main advantage: creating a master template, which can be extended by other files. • You can write plain PHP code in PHP syntax. • You can write plain PHP code in template syntax.
- 6. Declare variable • Mostly variables are values of input types, however, we can define a variable for simple testing purposes. • Syntax • The above syntax is equivalent to<?php $id=1; ?>. • Note: the variable declaration will not be used in the following slides. @php $id =1 @endphp
- 7. Displaying Data • If you want to print the value of a variable, then you can do so by simply enclosing the variable within the curly brackets. • Syntax • In blade template, we do not need to write the code between • The above syntax is equivalent to<?= $variable ?>. {{$variable}}; <?php echo $variable; ?>
- 8. Displaying Data • Ternary operator • In blade template, the syntax of ternary operator can be written as: • If the variable is not set for a value, a ‘default value’ string is printed. • Note that if the variable is not defined it will show an ‘undefined variable’ error message. • The above syntax is equivalent to {{{ $variable or 'default value’}}} <?= isset($variable) ? $variable : ?default value? ?>
- 9. Blade Template Control Statements 1.<html> 2.<body> 3. <font size='5' face='Arial'> 4.@if(($id)==1) 5.student id is equal to 1. 6.@else 7.student id is not equal to 1 8.@endif 9.</font> 10.</body> 11.</html> Blade Code Output
- 10. Blade Template Control Statements 1.<html> 2. <body> 3. <font size='5' face='Arial'> 4.@unless($id==1) 5.student id is not equal to 1. 6.@endunless 7.</font> 8.</body> 9.</html> Blade Code Output Blade interally changes unless(condition) into if(! condition)
- 12. For Loop in Blade • The blade templating engine provides loops such as • @for, @endfor • @foreach, @endforeach • @while, and @endwhile directives. These directives are used to create the php loop equivalent statements. @for ($i = 0; $i < 10; $i++) {{$i}} @endfor
- 13. For each Loop in Blade • Loop through array and skips displaying an item if not set to value. 1.@foreach($students as $students) 2.{{{$students}}} 3.@endforeach
- 19. Tutorial • Laravel Blade Template (Arabic Playlist) https://www.youtube.com/watch?v=UEoR7f1_V uw