Autocomplete form with preselection

Autocomplete form with preselection

by Andreas Stephan -
Number of replies: 1

Hello,

maybe anyone can help me with the autocomplete form using Ajax. Sofar I've managed to fetch the data from a service und save the selected data into the db.  It also sets the right preselection from the db, when the form is initialized., using valuehtmlcallback. Here's a small snippet from the code:

$attributes = array(
    'multiple' => false,
    'noselectionstring' => get_string('no_categories', 'tool_webanalytics'),
    'ajax' => 'tool_webanalytics/categories',
    'valuehtmlcallback' => function ($value) {
        global $OUTPUT, $DB;
        $rec = $DB->get_record('course_categories', array('id' => $value), 'name');
        if (!$rec) {
            return;
        }
        $categories = [
            'label' => $rec->name,
            'value' => $value
        ];
        return $OUTPUT->render_from_template('tool_webanalytics/form-categories', $categories);
    }
);

$mform->addElement('autocomplete', 'categories', get_string('categories', 'tool_webanalytics'), [], $attributes);
$mform->addHelpButton('categories', 'categories', 'tool_webanalytics');
The problem I have is, I am failing to preselect multiple entries. So for example:
$attributes = array(
    'multiple' => true,
    'noselectionstring' => get_string('no_categories', 'tool_webanalytics'),
    'ajax' => 'tool_webanalytics/categories',
    'valuehtmlcallback' => function ($value) {
        global $OUTPUT;

        $categories = 
            'label' => "My 1st label",
            'value' => 2
        ], [
            'label' => "My 2nd label",
            'value' => 3
        ;

        // WHAT COMES IN HERE???
    }
);
Any advice is appreciated smile

                        

    
    
    
                            
    
    
                                

                                        
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                                        In reply to Andreas Stephan
                                        
Re: Autocomplete form with preselection

                                        

                                            by Andreas Stephan - 
                        

                                

                
                                        

                                        

                            

                
                            

                
                                

                                    

                                        
Got it, actually it was very easy. You don't have to use valuehtmlcallback. Just pass in your selection inside addElement:


        $mform->addElement('autocomplete', 'categories', get_string('categories', 'tool_webanalytics'), $selection, $attributes);


... where  $selection is an associative Array, where  key is your value and the array value is your label:

[

 "your_value" = "your_label"

]

                                    

                
                
                
                                        
                
                
                                            

                                                    
Average of ratings: Useful (1)