A good tutorial for ActionBar Learning

http://www.vogella.com/tutorials/AndroidActionBar/article.html

interesting Text to speech engines

Javascript : MeSpeak.js {speak.js }

Java: FreeTTS

Indic languages: Dhvni TTS

Postfix : lessons learnt

How to check mail queue:
mailq

How to delete all mails in queue:
postsuper -d ALL

where to see mail logs:
/var/log/mail.log


How to enable google to authenticate email address:

• Go to the Admin Console
• Click on "Google Apps"
• Click on "Gmail"
• Scroll down until you see "Authenticate Email" and click that
• Select the domain you wish to add DKIM to
• When it asks what prefix you want to use, simply use the default of 'google'

You will then see a TXT record in two parts, one piece has the domain and the other has the actual TXT record. You need to go into your DNS settings on your server for your domain and add this record. If your DNS control panel does not allow you to add the domain of google._domainkey, simply make the domain fully qualified like google._domainkey.onlinetyari.com

Debugging Jquery validate: Tips

I found below issue why it didn't work:

1. syntax wrong  use web developer-> error console

2. Message not provided for rule.

Jquery validate: call manually and validate select options

You can validate only one element at a time.

to call manually: sample code
$("#add_new_word").validate().element("#new_eng_word");
    $("#add_new_word").validate().element("#new_eng_grammar");

How to validate select option:
keep first option as value=""
select  class="form-control" name="new_eng_grammar" id="new_eng_grammar" requied autofocus>
            <option value="">Select English Grammar</option>
            <?php foreach($englishGrammarTypes as $englishGrammarType)
            {
                echo "<option value='".$englishGrammarType['value']."'>".$englishGrammarType['name']."</option>";
            }
            ?>

        </select>

rules:
        new_eng_grammar: {
            required: true
        },

messages: {
      
        new_eng_grammar: {
             required: "Please select english grammar"
        }
    }

Using it with custom submit button:
function validate()
{
    $("#add_new_word").validate().element("#new_hindi_word");
    $("#add_new_word").validate().element("#new_eng_word");
    $("#add_new_word").validate().element("#new_eng_example");
    $("#add_new_word").validate().element("#new_hindi_example");
    $("#add_new_word").validate().element("#new_eng_grammar");
    $("#add_new_word").validate().element("#new_hindi_grammar");
    $("#add_new_word").validate();
}
function addword()
{
    validate();
    if(!$("#add_new_word").valid())
    {
        return;
    }
}

Ubuntu: How to enable mod rewrite

step 1:

sudo a2enmod rewrite 

sudo vi /etc/apache2/sites-available/default

  <Directory /var/www/>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride all
                Order allow,deny
                allow from all
        </Directory> 

 sudo service apache2 restart

fastest way to remove files in linux

Deleting files through perl is fastest.

perl -e 'for(<*>){((stat)[9]<(unlink))}'
  

How to run Linux command in background

Put & after command

example:
find /var/lib/php5 -mtime +2 -name 'sess_*' -delete &

Must setup for new web server

(i). PHP session clearance cron job

bash script with content:
#!/bin/bash
find /var/lib/php5 -mtime +2 -name 'sess_*' -delete

Add to cron job
1. crontab -e
2.
# m h  dom mon dow   command
5 0 * * * cleansession.sh

3. service cron restart


(ii) Enable Mod rewrite and Headers
 refer to blog post:
   http://bholameena.blogspot.in/2014/01/ubuntu-how-to-enable-mod-rewrite.html

(iii) Enable Headers
     $ sudo a2enmod headers

Useful Linux commands

Finds all files with extentions:
sudo find /var/log/ -mtime +2 -name '*.log'

Delete all files with extention:
sudo find /var/log/ -mtime +2 -name '*.log' -delete

Recursive number of files:

for i in /var/*; do echo $i; find $i | wc -l; done

How to check disk files issues: inode exceeded

Check inode through:
df -i

To count all the files in a directory and all it's subdirectories:

$ for i in /*; do echo $i; find $i | wc -l; done

Then you can narrow down your search by replacing the /* for any directory that has an unusually large number of files in. For me it was /var

$ for i in /var/*; do echo $i; find $i | wc -l; done

Delete when rm fails:

 find . -mtime +2 -name '*' -delete

Website Maintenance: Importance of HTTP 503

Include below code for maintenance of site:

define('OT_MAINTENANCE',false);
if(OT_MAINTENANCE)
{
   header("HTTP/1.1 503 Service Temporarily Unavailable");
   header("Status: 503 Service unavailable");
   header("Retry-After: 3600");   
   echo '<h2>Service not available. Site under Maintenance. Please try later.</h2>';
   exit;   
}

Mysql emergency: How to backup data of crashed mysql

$ cd path/to/mount/var/lib/
$ sudo tar -czvf mysql.tgz mysql/

Once you’ve gzipped your data, scp it over to your new server.

$ scp mysql.tgz user@newserverip:

How to Fix Mysql start issue

Problem:InnoDB: Compressed tables use zlib 1.2.3.4 mysqld: Can't create/write to file '/tmp/ibfIRdc9' (Errcode: 28)

solution:
1. delete files in /tmp. Make sure disk has free space.
2. restart mysql

Sample code: How to insert table items using jquery

Below is sample code to auto insert table items using jquery.

  $('#word_info_detail tbody').remove();  //clean all rows.

insert items:

html  = '<tbody id="roundtrip_price_' + price_data_key + '">';
html += '<tr>';
html += '<td class="left" style="width:3px;">';
html += '<span onclick="removeRoundtripPrice(' + data.price_detail['car_type_id']+','+data.price_detail['ac_type']+');" class="remove">&nbsp;</span>';
html += '</td>';
html += '<td class="left" style="width:3px;">';
html += '<span id="active_rt_price_'+price_data_key+'" onclick="inactivateRoundtripPrice(' + data.price_detail['car_type_id']+','+data.price_detail['ac_type']+');" class="active">&nbsp;</span>';
html += '<span style="display:none" id="inactive_rt_price_'+price_data_key+'" onclick="activateRoundtripPrice(' + data.price_detail['car_type_id']+','+data.price_detail['ac_type']+');" class="inactive">&nbsp;</span>';

html += '</td>';
html += '<td class="left">'  + data.price_detail['car_model'] + '</td>';
html += '<td class="right">Rs. ' + data.price_detail['fare'] + ' / km</td>';
html += '<td class="right">Rs. ' + data.price_detail['driver_charge_per_day'] + ' /  day</td>';
html += '<td class="right">' + data.price_detail['min_km_per_day'] + ' Km / day</td>';
html += '</tr>';
html += '</tbody>';
$('#roundtrip_price_list').append(html);

How to import common ResourceDictionary in windows 8 project

Step 1: open App.xaml

Step 2:

<Application
    x:Class="HinkhojDictApp.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:HinkhojDictApp">

    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>

                <!--
                    Styles that define common aspects of the platform look and feel
                    Required by Visual Studio project and item templates
                 -->
                <ResourceDictionary Source="Common/StandardStyles.xaml"/>
                <ResourceDictionary Source="HinkhojStyles.xaml"/>
            </ResourceDictionary.MergedDictionaries>

        </ResourceDictionary>
    </Application.Resources>
</Application>

How to exclude files from git

Step 1: Git remove files
  $ git rm --cached *.sqlite

Step 2: Create .gitignore file
$vi .gitignore

write line ==>  *.sqlite

How to Git push in bare empty repository

if you see below message:
No refs in common and none specified; doing nothing.
Perhaps you should specify a branch such as 'master'.


You need to push using below commands:
$ git push origin master

How to debug apache website errors

You can view apache logging at below location in Ubuntu:

1. cd /var/log/apache2

2. tail -30 error.log

How to use: Remote method for Jquery form validation

I recently done work related to Async automatic Remote validation of Form elements.
Pr-requisite: Download Jquery validation Plugin from http://jqueryvalidation.org/


Step 1: define form HTML

<div class="row" style="margin-top:10px">
<div class="col-md-3"><label>User Name:</label></div>
<div class="col-md-4"><input type="text" name="user_id" id="user_id"
     class="form-control"
    placeholder="User Id" required autofocus /></div>
</div>

Step 2:

define Form validation:
 $("#form").validate({
            rules: {
                    user_id: {
                    required:true,
                    minlength:5,
                    remote: {
                        url: 'ajax/dup_user_id_checker.php'                       
                     }
                }


Step 3:
Define remote method which return "true" for success and "error messages" for failure.
source: ajax/dup_user_id_checker.php

 public function dup_user_id_check()
       {
           $output=Array();
           if(!isset($this->request->get['user_id']))
           {
               $output="Unable to check for duplicate user name";
           }
           else
           {
               $user_id=$this->request->get['user_id'];
              
               $this->load->model('user/user');
               if($this->model_user_user->IsUserExists($user_id))
               {
                  $output="$user_id already taken.";
               }   
               else
               {
                  $this->log->write($user_id." found");
                  $output="true";   
               }
           }
           $this->data['json_output']=json_encode($output);
            $this->template = 'common/json.tpl';
        $this->children = array();
        $this->response->setOutput($this->render(TRUE), $this->config->get('config_compression'));
      
       }

Ubuntu: How to setup Memcached for Php

Use below commands to setup Memcached for Php

1. sudo apt-get install memcached
2. sudo apt-get install php5-memecached

3. sudo service apache2 restart

Twitter Bootstrap: Sample code using it

Twitter Bootstrap is recommended CSS for basic HTML UI controls.

Below is sample code I used :

<?php echo $header; ?>
<div class="row">
<div class="col-md-9">
<h2 class="form-signin-heading" style="text-align:left;margin:20px">Please Register for Contributor account</h2><?php if ($error_warning) { ?>
<div class="warning" style="padding: 3px;"><?php echo $error_warning; ?></div>
<?php } ?>
<form role="form" action="<?php echo $action; ?>" method="post"
    enctype="multipart/form-data" id="form">
<div class="row">
<div class="col-md-3"><label>First Name</label></div>
<div class="col-md-4"><input type="text" name="first_name"
     class="form-control"
    placeholder="First Name" required autofocus /></div>
</div>

<div class="row" style="margin-top:10px">
<div class="col-md-3"><label>Last Name</label></div>
<div class="col-md-4"><input type="text" name="last_name"
     class="form-control"
    placeholder="Last Name" required autofocus /></div>
</div>

<div class="row" style="margin-top:10px">
<div class="col-md-3"><label>User Id</label></div>
<div class="col-md-4"><input type="text" name="user_id"
     class="form-control"
    placeholder="User Id" required autofocus /></div>
</div>

<div class="row" style="margin-top:10px">
<div class="col-md-3"><label>E-Mail Address:</label></div>
<div class="col-md-4"><input type="text" name="email"
     class="form-control"
    placeholder="E-mail address" required autofocus /></div>
</div>

<div class="row" style="margin-top:10px">
<div class="col-md-3"><label> Password:</label></div>
<div class="col-md-4"><input type="password" name="password"
    value="<?php echo $password; ?>" class="form-control"
    placeholder="Password" required/></div>
</div>

<div class="row" style="margin-top:10px">
<div class="col-md-3"><label> Re-enter Password</label></div>
<div class="col-md-4"><input type="password2" name="password2"
    value="<?php echo $password; ?>" class="form-control"
    placeholder="Re-enter Password" required/></div>
</div>

<div class="row" style="margin-top:10px">
<div class="col-md-3">
<button onclick="$('#form').submit(); return false;" href="#"
    class="btn btn-lg btn-primary btn-block" type="submit">Register</button>
</div>
</div>
<?php if ($redirect) { ?> <input type="hidden" name="redirect"
    value="<?php echo $redirect; ?>" /> <?php } ?>
</form>

</div>

</div>
<script type="text/javascript"><!--
    $('#form input').keydown(function(e) {
        if (e.keyCode == 13) {
            $('#form').submit();
        }
    });
    //-->
   
  $("#form").validate({
            rules: {
                email: {
                    required: true,
                    email: true,
                    remote: {
                        url: "<?php echo HTTP_SERVER."ajax/dup_user_id_check.php";?>",
                        type: "post"
                     }
                }
               
            },
            messages: {
                email: {
                    required: "Please Enter Email!",
                    email: "This is not a valid email!",
                    remote: "Email already in use!"
                }
            }
        });
</script>
<?php echo $footer; ?>

Best Practices : HTML Forms validation

Use Jquiry based validation plugin.

download from :
http://bassistance.de/jquery-plugins/jquery-plugin-validation/

CDN:
http://ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js


 Sample code used by me:

   $("#form").validate({
            rules: {
                email: {
                    required: true,
                    email: true,
                    remote: {
                        url: "<?php echo HTTP_SERVER."ajax/dup_user_id_check.php";?>",
                        type: "post"
                     }
                }
               
            },
            messages: {
                email: {
                    required: "Please Enter Email!",
                    email: "This is not a valid email!",
                    remote: "Email already in use!"
                }
            }
        });

How to disable to overlay scollbar in Ubuntu

Run below command:

echo export LIBOVERLAY_SCROLLBAR=0 | sudo tee -a /etc/X11/Xsession.d/99disable-overlay-scrollbars

Restart your machine after it.