- Laravel Application Development Cookbook
- Terry Matula
- 487字
- 2021-07-23 15:33:34
Creating an autocomplete text input
On our web forms, there may be times when we want to have an autocomplete text field. This can be handy for populating common search terms or product names. Using the jQueryUI Autocomplete library along with Laravel, that becomes an easy task.
Getting ready
In this recipe, we'll be using the CDN versions of jQuery and jQueryUI; however, we could also download them and place them in our public/js directory, if we wanted to have them locally.
How to do it...
To complete this recipe, follow these steps:
- Create a route to hold our autocomplete form:
Route::get('autocomplete', function() { return View::make('autocomplete'); }); - Make a view in the
app/viewsdirectory namedautocomplete.phpwith our form's HTML and JavaScript:<!DOCTYPE html> <html> <head> <title>Laravel Autocomplete</title> <meta charset="utf-8"> <link rel="stylesheet" /> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script> <script src="http://codeorigin.jquery.com/ui/1.10.2/jquery-ui.min.js"></script> </head> <body> <h2>Laravel Autocomplete</h2> <?= Form::open() ?> <?= Form::label('auto', 'Find a color: ') ?> <?= Form::text('auto', '', array('id' => 'auto'))?> <br> <?= Form::label('response', 'Our color key: ') ?> <?= Form::text('response', '', array('id' =>'response', 'disabled' => 'disabled')) ?> <?= Form::close() ?> <script type="text/javascript"> $(function() { $("#auto").autocomplete({ source: "getdata", minLength: 1, select: function( event, ui ) { $('#response').val(ui.item.id); } }); }); </script> </body> </html> - Create a route that will populate the data for the
autocompletefield:Route::get('getdata', function() { $term = Str::lower(Input::get('term')); $data = array( 'R' => 'Red', 'O' => 'Orange', 'Y' => 'Yellow', 'G' => 'Green', 'B' => 'Blue', 'I' => 'Indigo', 'V' => 'Violet', ); $return_array = array(); foreach ($data as $k => $v) { if (strpos(Str::lower($v), $term) !== FALSE) { $return_array[] = array('value' => $v, 'id' =>$k); } } return Response::json($return_array); });
How it works...
In our form, we're creating a text field to accept user input that will be used for the autocomplete. There's also a disabled text field that we can use to see the ID of the value that was selected. This can be useful if you have an ID for a particular value that's numeric, or otherwise not named in a standard way. In our example, we're using the first letter of the color as the ID.
As the user starts typing, autocomplete sends a GET request to the source that we added, using the word term in the query string. To process this, we create a route that gets the input, and convert it to lower-case. For our data, we're using a simple array of values but it would be fairly easy to add in a database query at this point. Our route checks the values in the array to see if there are any matches with the user input and, if so, adds the ID and value to the array we will return. Then, we output the array as JSON, for the autocomplete script.
Back on our form page, when the user selects a value, we add the ID to the disabled response field. Many times, this will be a hidden field, which we can then pass on when we submit the form.
There's more...
If we'd like to have our getdata route only accessible from our autocomplete form, or some other AJAX request, we could simply wrap the code in if (Request::ajax()) {} or create a filter that rejects any non-AJAX requests.