Tuesday, April 22, 2014

Zend Framework 2 & MAMP : Memory Issues

I ran into a problem working through the tutorial for Learn ZF2 for form validation. I reached the section where the form data would be inserted into a database and that wasn't possible using the command line PHP server. I decided to switch to MAMP because it has more stuff baked in.

I quickly ran into an issue that was tough to track down. After added the database code the form no longer submitted. After ripping out lots of code and not finding an answer I called it a night. The next day I figured out the problem was with MAMP not my code. If I disabled the file validation on the form everything worked fine.

This was the error I ran into
Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 32 bytes) in /Volumes/zend_framework/learnzf2/vendor/zendframework/zendframework/library/Zend/Stdlib/ErrorHandler.php on line 113

Not the most straight forward bug. Turns out the issue is the command line PHP server has a larger memory_limit size. It's 128M while MAMP is set to 32M. It overflowed after processing the file. After upping memory_limit to 128M and restarting the server everything worked fine.

The memory_limit var is stored in php.ini. It can be reached by using
File => Edit template => php => php 5.4
Find memory_limit and change it to 128M.

Wednesday, April 9, 2014

Zend Framework 2.x Learn ZF2 by Example : Unable to render template

Getting to the MVC portion of the book and ran into an error. On page 59 it shows you how to manually include a template to aid debugging. I ran into this error when trying to see my changes.


Fatal error: Uncaught exception 'Zend\View\Exception\RuntimeException' with message 'Zend\View\Renderer\PhpRenderer::render: Unable to render template "debug/layout/sidebar"; resolver could not resolve to a file' in /Volumes/zend_framework/learnzf2/vendor/zendframework/zendframework/library/Zend/View/Renderer/PhpRenderer.php:498 Stack trace: #0 /Volumes/zend_framework/learnzf2/vendor/zendframework/zendframework/library/Zend/View/View.php(205): Zend\View\Renderer\PhpRenderer->render(Object(Zend\View\Model\ViewModel)) #1 /Volumes/zend_framework/learnzf2/vendor/zendframework/zendframework/library/Zend/Mvc/View/Http/DefaultRenderingStrategy.php(102): Zend\View\View->render(Object(Zend\View\Model\ViewModel)) #2 [internal function]: Zend\Mvc\View\Http\DefaultRenderingStrategy->render(Object(Zend\Mvc\MvcEvent)) #3 /Volumes/zend_framework/learnzf2/vendor/zendframework/zendframework/library/Zend/EventManager/EventManager.php(468): call_user_func(Array, Object(Zend\Mvc\MvcEvent)) #4 /Volumes/zend_framework/learnzf2/vendor/zendframe in /Volumes/zend_framework/learnzf2/vendor/zendframework/zendframework/library/Zend/View/Renderer/PhpRenderer.php on line 498

Page 58 talks about the way templates are included. The middle of the page shows a config option called 'template_path_stack'. This is the path the PhpRender uses to find manually included templates. There is a similar line in the Application module.config.php. I thought this would be imported into the master config but that didn't happen. You have to add this.

Tuesday, April 8, 2014

Zend Framework 2.x Learn ZF2 by Example : Error creating Debug module

I'm rewriting part of my website with Zend Framework 2 because I want to use something more mature and flexible than something I wrote years ago. I picked up the book Learn ZF2 by Example because it was rated well. The intro gets your feet wet and eases you in. I got stuck when trying to reproduce the steps to create a new module using ZFTool.

On page 28 under Automatic Module Creation they want you to download a tool that will help with creating new modules. I'm not sure if the instructions are old but it not work. Running the command will give you the following error

Fatal error: Uncaught exception 'Zend\ModuleManager\Exception\RuntimeException' with message 'Module (ZFTool) could not be initialized.' in /Volumes/zend_framework/learnzf2/vendor/zendframework/zendframework/library/Zend/ModuleManager/ModuleManager.php:189
Stack trace:
#0 /Volumes/zend_framework/learnzf2/vendor/zendframework/zendframework/library/Zend/ModuleManager/ModuleManager.php(163): Zend\ModuleManager\ModuleManager->loadModuleByName(Object(Zend\ModuleManager\ModuleEvent))
#1 /Volumes/zend_framework/learnzf2/vendor/zendframework/zendframework/library/Zend/ModuleManager/ModuleManager.php(90): Zend\ModuleManager\ModuleManager->loadModule('ZFTool')
#2 [internal function]: Zend\ModuleManager\ModuleManager->onLoadModules(Object(Zend\ModuleManager\ModuleEvent))
#3 /Volumes/zend_framework/learnzf2/vendor/zendframework/zendframework/library/Zend/EventManager/EventManager.php(468): call_user_func(Array, Object(Zend\ModuleManager\ModuleEvent))
#4 /Volumes/zend_framework/learnzf2/vendor/zendframework/zendframework/library/Zend/ in /Volumes/zend_framework/learnzf2/vendor/zendframework/zendframework/library/Zend/ModuleManager/ModuleManager.php on line 189

Your path will vary, but the error is the same. Searching google didn't give me a good answer. The ZFTool page has instructions on how to install the it using composer. When the install finished I ran the command php vendor/bin/zf.php create module Debug and the new module was created.

I hope this saves you some time.

Monday, February 24, 2014

Sencha Touch: Reorder a list with drag and drop handles using SortableList

Part of a project I'm working on requires the ability to reorder a list. I was pretty sure sencha touch could handle this, but couldn't figure out how to do it. I searched google for a solid week. I had one lead that turned bad after digging into it further. I basically gave up and moved onto the next issue when I ran across the solution buried in their documentation: SortableList

The second problem arose from the poor documentation on this feature. Outside of the class docs there is nothing explaining how to use it. The upside is at least it's easy to view the source.

I ran across this forum post that talked about a bug in the code. This was the only code I found that gave an example of how the code works.

There are a few things required to use this plugin.

Step 1: Include the plugin

// Make sure the plugin in include when the app builds
requires: ['Ext.plugin.SortableList'],

config:{
        // Include the plugin in your config. Don't forget the period on the class name
        plugins: [{xclass: 'Ext.plugin.SortableList', handleSelector: '.gripper'}],

        
        // These are required to fix a bug that exists in the plugin
        infinite: true,
        variableHeights: true,
        ...
}

Step 2: Configure the drag handle

config: {
        // Set the class to the name you passed in for the handleSelector
        itemTpl: '<span class="gripper"></span>[html goes here]'
        ...
        }

The tag used for the list-sortablehandle is the object that will start the reorder process. This can be styled using whatever you like.

Step 3: Listen for the finishing event

config: {
        listeners:[
            event: 'dragsort',
            // to is the new position in the list
            // from is where the item used to be
            fn: function(listObject, row, to, from)
        ]
        ...
}

It was smooth sailing after this point.

Thursday, January 23, 2014

Javascript: Problems, trouble, issues parsing JSON data / Unexpected token

I ran into an issue trying to parse a JSON string that made very little sense. Normally when you have a token in the JSON response that doesn't work the error will include that character. This time it gave me nothing.

// This is all you have to do
JSON.parse(jsonObject);

After 4 hours and much googling I had no answer. I though for some reason the server response had the wrong type of quotes on it, but turned out to be something very left field.

I used JSON.stringify() on the server response and saw something really weird on the end of the string that wasn't showing up by looking at the response.

// What is this?!
'"timeCreated\":1390518047098}\u0000\u0000\'

The \u0000 character was choking the parser and wasn't showing up as a bad token. This is the unicode character for null. Not sure why it was on the response but it was causing the problem. Running this cleaned up the problem.

// Take out the garbage
[server response] = [server response].replace(/\u0000/g, "")

As a safety measure it's good to have a method you can use to clean your JSON strings before trying to parse them.

Friday, January 10, 2014

Javascript: Quick Date timestamp

I wanted to find a quick way to compare two dates. The easiest way is to use their unix timestamp. If the date exists as an object you can use .getTime() to retrieve the number of milliseconds that have passed since epoch time.

You can retrieve that number even faster with the following bit of code

+new Date

I found the tip here and wanted to surface it.

Saturday, December 14, 2013

Sencha Touch: Problems with Date Time Picker

Part of a project I'm working on requires an form element that allows the user to select a date and time for the same field. Sencha Touch has a built in form field for selecting a date and it works really well. They don't have one that allows you to pick both the date and the time.

I found a plugin on Sencha's site that seemed to be just what I was looking for. There were a few issues with it.

#1 No install instructions.
This is the first plugin I've used and I couldn't find anything on Sencha's site that was helpful. After some digging I found instructions for another plugin that pointed me in the right direction.

  1. Copy the ux folder to your app directory.
  2. Open your app.js file and locate the Ext.Loader line. If there isn't a setPath method chained to setConfig add one. Add these key/value pairs to the object. They correspond to the Ext.define namespaces for DateTime.js and DateTimePicker.js located in the ux folder.
    1. 'Ext.ux.field' : './ux'
    2. 'Ext.ux.picker': './ux'
#2 Bugs
The first problem I had was the cancel button destroyed the picker. One feature of the plugin allows you to destroy the picker to save memory. It's missing a check for the destroy option and nukes it on cancel.

The second problem is if you press OK to the default date it doesn't actually read it properly. Deep in DateTime.js the getValue method looks through the items on the picker and grabs the slots. It calls getValue on each slot but returns nothing. You need to pass true for it to read the proper value.

I was able to find the original source on github. I forked the repo and fixed all the bugs I found. I submitted a pull request so hopefully I'll hear back from the guy soon so future users will have fewer problems.

UPDATE
The github version of the plugin has integrated my pull request that fixes the issues I ran into.