Need help with module creation

[uzlander]

Hi there, i've been trying to create a module which works in the admin panel, and does the following:
Auto-fill the "summary" field with some body excerpt in case the user leaves it blank.

Can't  figure what is wrong and it refuses to function as i expect. So, the code:
 

<?php namespace ProcessWire;

class FillSummaryHook extends WireData implements Module { 

    public static function getModuleInfo() {

		return array(
			'title' => 'Fill Summary Field', 	
			'summary' => 'Useful module',
			'version' => 0.4, 
			'autoload' => true, 
		);
	}

  public function ready() { 
    $this->pages->addHookBefore('saved', function($event) {
    	$page = $event->arguments[0];

    	$summaryField = $page->field('summary');
    	$bodyField = $page->field('body');
    
    	// If the summary field is empty, set it to the body excerpt
    	if (empty($summaryField->value)) {
    	    $summaryField->value = strip_tags(substr($bodyField->value, 0, 192));
    	}
    });
  }
}

The file's named: "FillSummaryHook.module" which is inside the same named folder within "modules" directory.
On saving the page it outputs (screenshot)

[da²]

Hello,

Error message says there's no property "field" on Page class. There are also some more mistakes.

This should be better:

public function ready() {
    $this->pages->addHookBefore('saveReady', function($event) { // Replaced saved with saveReady
        $page = $event->arguments(0); // Replaced [0] with (0)

        $summaryField = $page->summary; // Removed ->field('name')
        $bodyField = $page->body; // Removed ->field('name')
        
        if (empty($summaryField)) { // Removed ->value
            $page->summary = strip_tags(substr($bodyField, 0, 192)); // replaced $summaryField->value with $page->summary, $bodyField->value with $bodyField
        }
    });
}

Note that "save" hook is executed after the page is saved, so it's too late.

Documentation : Page and Pages hooks 

 

EDIT : Note that you can also do that without creating a module, just by adding the hook ($this->pages->addHookBefore...) in site/templates/admin.php

[uzlander]

Fantastic(!) Such a rapid reply, and it worked! Looks like i have yet to learn much myself to be any good at php & PW APIs to deal with :). ThankYou, love the processwire community

[millipedia]

Just in case it might be useful to you, there's a $sanitizer->truncate() method which will trim a block of text to the nearest  word / sentence etc. It's very handy for creating neat summaries.