Software Updates

I just wanted to make a quick post to update everyone on the progress I’ve been making on my symfony plugins.

majaxDoctrineMediaPlugin (github repository and symfony plugin)

A number of things have happened here:

  1. It’s now in the symfony plugin repository!
  2. All of it’s dependencies have been properly configured in the pear package.xml
  3. It gained concurrency support to keep from wasting CPU and mangling the files it processes.

majaxPheanstalk (github repository and symfony plugin)

It is now in the symfony plugin repository!

majaxJqueryPlugin (github repository and symfony plugin)

It is now in the symfony plugin repository!

majaxMarkdownPlugin (github repository and symfony plugin)

It is now in the symfony plugin repository!

A simple example on how to use post validators in symfony

Someone came into the #symfony channel on freenode asking how to add conditional validators that would require a text box to be filled out when a checkbox was ticked. As I realize this is a common question (though the circumstances may change), I wanted to put this example up here as well, for others.

Here’s the example:

class TestForm
{
  public function configure()
  {
    // ... snip ...
 
    $this->validatorSchema->setPostValidator(
      new sfValidatorCallback(array('callback' => array($this, 'contextualChecks')))
    );
  }
 
  public function contextualChecks($validator, $values)
  {
    if ($values['checkbox_1'] == 1)
    {
      if ($values['textbox_for_checkbox_1'] == '')
      {
        $error = new sfValidatorError($validator, 'Field is required when Checkbox 1 is checked.');
        $ves = new sfValidatorErrorSchema($validator, array('textbox_for_checkbox_1' => $error));
        throw $ves;
      }
    }
    return $values;
  }
}

Note: I completely left out returning $values in the initial draft. I apologize!

Jack and the majaxPheanstalk

I have just made my first release to GitHub, majaxPheanstalkPlugin for symfony 1.4.x (possibly will work on older ones). It’s a set of tools that help to access Beanstalkd and make building workers much simpler.

It builds off of the work of Paul Annesley (pda)‘s pheanstalk which provides a simple php library for accessing a Beanstalkd server.

The goal is to provide you with simple tools for managing your Beanstalkd integration. Right now it’s just worker thread tools and a simple factory, but I hope to grow it into a more complete library as time goes on.

Keeping pace

Alright, I understand that in order to keep people checking back regularly, I have to post regularly.

I get that.

I really do!

Sometimes, though, life just takes over. I’m working on making that better.

To that end: Did anyone else attend the Day Camp 4 Developers session last weekend? If not, you missed a real riot. The speakers were excellent, and the crowd in IRC was just awesome.

How to build a better date widget in symfony with jQuery

We’re going to step things up a notch with this one, so hang on for the ride, because for those of you not already well versed in symfony and jQuery, there will be a lot of new information, and it will go pretty quickly, but I will try to make sure to keep everyone caught up. This is another post I hinted towards back when I first wrote about symfony widgets. Right, so, on to the fun!

First things first, let’s talk about requirements. My only real requirement is that it must be seamless. We must be able to only implement the widget, and have everything else work exactly as intended. For a date widget, this means when the user clicks that submit button, an array with ‘month’, ‘day’, and ‘year’ must be sent back. Not a string, not JSON, just that basic array.

It’s for the above reason that we will need to make a widget on top of the basic jQuery UI Datepicker Widget. The Datepicker alone would just return a string when we submitted the form, which would then require at least a custom validator, if not much more. So to simplify things later, we’ll put in more effort now.

There are four things we will be doing in this tutorial to make this happen. Here’s a quick overview:

  1. Set up majaxJqueryPlugin to give us our jQuery/jQuery UI base
  2. Set up a new module for us to use with the widget tutorials
  3. Create our widget class
  4. Create our jQuery UI widget that goes along with our widget class

1. Setup majaxJqueryPlugin

We’re using my plugin for two reasons:

  1. It’s my blog, so of course, I’m using my plugin
  2. We need jQuery UI, both the JavaScript and the CSS, and majaxJqueryPlugin provides that right away

Setting it up is easy:

cd plugins
wget -O majaxJqueryPlugin.zip http://jmather.com/wp-content/plugins/download-monitor/download.php?id=4

Now we add the plugin to our Project Configuration. Open up your config/ProjectConfiguration.class.php file, and place this line somewhere within your setup() function:

    $this->enablePlugins('majaxJqueryPlugin');

And one last step, we need to publish the assets:

./symfony plugin:publish-assets

Alright, now we’re ready to move on to the good stuff.

2. Setting up our plugin

Now we need to make a new plugin, and set up a few directories for future use. It’s pretty self-explanatory so we’ll cut right to the code, and come back afterwards to talk about some of the extras.

./symfony generate:plugin majaxWidgetPlugin
mkdir -p plugins/majaxWidgetPlugin/web/js
mkdir -p plugins/majaxWidgetPlugin/lib/widget

We made our plugin, then we made the directory our jQuery plugins will go in, and the directory where we will store our widgets. The -p flag means “no error if existing, make parent directories as needed” which saved us a few mkdir commands.

3. Making our symfony widget

Now open up plugins/majaxWidgetPlugin/lib/widget/majaxWidgetFormDate.class.php and here’s our code:

<?php
 
class majaxWidgetFormDate extends sfWidgetFormDate
{
  public function render($name, $value = null, $attributes = array(), $errors = array())
  {
    $sfContext = sfContext::getInstance();
    $resp = $sfContext->getResponse();
    $resp->addJavascript('/majaxWidgetsPlugin/js/jquery.majax.dateselector.js');
 
    $id = $this->generateId($name);
 
    $txt = ($this->getOption('can_be_empty') == true) ? 'true' : 'false';
 
    $display = '<div id="'.$id.'"></div>';
    $display .= '<div id="'.$id.'_ctrls">';
    $display .= parent::render($name, $value, $attributes, $errors);
    $display .= '</div>';
    $display .= '
<script type="text/javascript">
$(function() {
  $(\'#'.$id.'\').majaxdateselector({can_be_empty: '.$txt.'});
});
</script>
';
    return $display;
  }
}

So, to start out, we extend sfWidgetFormDate, as that will make the controls we need to manage a date submission. The only change we need to do, is to override the render function, which will let us add some custom code around the standard output, to allow us to more easily control the display.

The first thing we do in the render function is to include the required JavaScript. Some will say the widget shouldn’t know about the JavaScript, but I say, if the widget shouldn’t know… who should? We want to make this as transparent as possible, so why should we have to also remember to add a JavaScript include to use this widget?

Next, we grab our generated ID, and figure out our options (i.e. can the date be null) that we can pass along to Datepicker. After that we wrap the whole deal in a containing div, and then wrap the native controls in another specific div. You will see why we did this in a minute. Lastly, we write the JavaScript to activate the widget.

4. Making our jQuery Plugin

As is the standard, I’ll show you the code, then highlight portions that are interesting. This file goes in plugins/majaxWidgetPlugin/web/js/jquery.majax.dateselector.js

(function($) {
        $.widget('ui.majaxdateselector', {
                version: '1.0.0',
                eventPrefix: 'majax.dateselector',
                options: {
                        can_be_empty: false,
                        datepicker_opts: {
 
                        }
                },
                _create: function() {
                        this.options['id'] = $(this.element).attr('id');
                        this._hide_real_ctrls();
                        this._build_facade();
                        return this;
                },
                _build_facade: function() {
                        $(this.element).html('<input size="10" type="text" id="'+this.options['id']+'_display" />');
                        var tfDisplayUpdate = function(widget) {
                                return function() {
                                        widget._update_ctrls(this.value);
                                }
                        }
 
                        $('#'+this.options['id']+'_display').change(tfDisplayUpdate(this));
 
                        var m, d, y;
                        m = $('#'+this.options['id']+'_month').val();
                        d = $('#'+this.options['id']+'_day').val();
                        y = $('#'+this.options['id']+'_year').val();
                        if (parseInt(m) > 0 && parseInt(d) > 0 && parseInt(y) > 0)
                        {
                                $('#'+this.options['id']+'_display').val(this._zero_pad(m, 2)+'/'+this._zero_pad(d, 2)+'/'+y);
                        }
                        $('#'+this.options['id']+'_display').datepicker(this.options['datepicker_opts']);
                        if (this.options['can_be_empty'])
                        {
                                $('#'+this.options['id']).append(' <input type="button" id="'+this.options['id']+'_empty" value="Clear" />');
                                $('#'+this.options['id']+'_empty').button();
                                var tfClear = function(widget) {
                                        return function() {
                                                widget._clear_display();
                                                return false;
                                        }
                                }
                                $('#'+this.options['id']+'_empty').click(tfClear(this));
                        }
                },
                _zero_pad: function(num,count)
                {
                        var numZeropad = num + '';
                        while(numZeropad.length < count) {
                                numZeropad = "0" + numZeropad;
                        }
                        return numZeropad;
                },
                _clear_display: function() {
                        $('#'+this.options['id']+'_display').val('');
                        $('#'+this.options['id']+'_month').val('');
                        $('#'+this.options['id']+'_day').val('');
                        $('#'+this.options['id']+'_year').val('');
                },
                _update_ctrls: function(val) {
                        var vals = val.split('/');
                        if ((val == '' || vals.length != 3) && this.options['can_be_empty'])
                        {
                                $('#'+this.options['id']+'_month').val('');
                                $('#'+this.options['id']+'_day').val('');
                                $('#'+this.options['id']+'_year').val('');
                        }
 
                        var m, d, y;
                        m = vals[0];
                        d = vals[1];
                        y = vals[2];
 
                        if (parseInt(m) > 0 && parseInt(d) > 0 && parseInt(y) > 0)
                        {
                                $('#'+this.options['id']+'_month').val(parseInt(m));
                                $('#'+this.options['id']+'_day').val(parseInt(d));
                                $('#'+this.options['id']+'_year').val(parseInt(y));
                        }
                },
                _hide_real_ctrls: function() {
                        $('#'+this.options['id']+'_ctrls').css('display', 'none');
                },
                _show_real_ctrls: function() {
                        $('#'+this.options['id']+'_ctrls').css('display', null);
                },
                destroy: function() {
                        this._show_real_ctrls();
                        ('#'+this.options['id']).html('');
                        $.Widget.prototype.destroy.call(this);
                        return this;
                }
        });
})(jQuery);

You know, looking over, it’s pretty clear, I feel, what most parts do. The functions “_hide_real_ctrls”, and “_show_real_ctrls” hide and show that wrapping div we built around the original controls, so we can keep them in play, but not have to worry about controlling them. The “_build_facade” function builds our fake interactive Datepicker object, and optionally our ‘Clear’ button, if our date is allowed to be empty. Functions “_clear_display” and “_update_ctrls” to exactly as you would expect. Cure functions “_create” and “destroy” are from the jQuery UI Widget framework, and are called … can you guess when? 🙂

We’re done!

Once you’re done, you can replace any sfWidgetFormDate instance with a majaxWidgetFormDate instance, and everything else is handled. A little bit of effort up front, and many rewards down the road!

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