Add default blank value for select option in contact form 7 wordpress

Normally when you use contact form 7 plugin , for dropdown select option, there is no option to set blank value for the first option to validate the select field.

For example, what we have in wordpress contact form 7

<select name=”your_field_name”>
<option value=””>—</option>
<option value=”yes”>Yes</option>
<option value=”no”>No</option>
</select>

But in actual scenario, i want to display the label for the first option as “–Select Value–” with empty value.
To make the same change, you can use the dropdown code as below
[select* your_field_name_ class:form-select class:required first_as_label “–Select Value–” “Yes” “No”]

In the above code “first_as_label” is important parameter. It instruct the plugin to use the first option as label with default empty value. So the generated output look as below

<select name=”your_field_name”>
<option value=””>–Select Value–</option>
<option value=”yes”>Yes</option>
<option value=”no”>No</option>
</select>

If you have any queries, you can write back to us or comment in the comment section.

How to show or hide yii2 gridview action button conditionally

In Yii2 Gridview normally to display the action button we have the following chunk of code

$columns = [
['class' => 'yii\grid\SerialColumn'],
'name',
'description:ntext',
'status',
[
'class' => 'yii\grid\ActionColumn',
]
];

The output you see as below:

Now you have a scenario, to show the edit button only when the “Zone status” is active. So you have to add the additional line

$columns = [
['class' => 'yii\grid\SerialColumn'],
'name',
'description:ntext',
'status',
[
'class' => 'yii\grid\ActionColumn',
'contentOptions' => [],
'header'=>'Actions',
'template' => '{view} {update} {delete}',
'visibleButtons'=>[
'delete'=> function($model){
return $model->zone_status!='deleted';
},
'view'=> function($model){
return $model->zone_status!='active';
},
]
],
];

Now let me explain what changes were done to display the view button , when zone_status is active.

So the “visibleButtons” control the display of the action button based on the value returned by

function($model){
return $model->zone_status!='active';
}

If the condition hold true, view button will be displayed else not.

Next Level:

You can take this to next level. i.e. if you want to control the button style and the default url for each action, you can do it as below:

$columns = [
['class' => 'yii\grid\SerialColumn'],
'name',
'description:ntext',
'status',
[
'class' => 'yii\grid\ActionColumn',
'contentOptions' => [],
'header'=>'Actions',
'buttons' => [
'view' => function ($url,$model,$key) {
return Html::a('<button>Details</button>', Url::home()."zone/view?id=".$model->id);
},
'delete' => function ($url,$model,$key) {
if($model->zone_status != 'deleted') {
return Html::a('<button class="bk-custom-btn">Delete</button>', Url::home()."delete?id=".$model->id);
}
},
'update' => function ($url,$model,$key) {
$url = ['zone/update?id='.$model->id];
return Html::a('<button class="bk-edit-btn">Edit</button>',$url);
},
],
'template' => '{view} {update} {delete}',
'visibleButtons'=>[
'delete'=> function($model){
return $model->zone_status!='deleted';
},
'view'=> function($model){
return $model->zone_status=='active';
},
]
],
];

The final output as below:

How to create date wise apache error log and access log

By default apache write the access log and error log in the single file. Later it grow in sizes over days and then when you have to debug you find the issue from the apache log, it become difficult to open and read the file. And over a time, the log size bigger so big that, many of the file editor fail to load the file.

Default Logformat
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined

So apache come with a inbuilt program called rotatelogs.
First you need to check if rotatelogs is present on your server or not.

To check if rotatelogs is present type the below command
> whereis rotatelogs

The output of the command will be as below
rotatelogs: /usr/bin/rotatelogs /usr/share/man/man8/rotatelogs.8.gz

This “/usr/bin/rotatelogs” indicate that rotatelogs program is present

Now to split your errorlog and accesslog by date, you need to comment the default log format
#ErrorLog ${APACHE_LOG_DIR}/error.log
#CustomLog ${APACHE_LOG_DIR}/access.log combined

and write down the below format.

CustomLog “| /usr/bin/rotatelogs -l /var/log/apache2/access.%Y.%m.%d.log 86400” common
ErrorLog “| /usr/bin/rotatelogs -l /var/log/apache2/error.%Y.%m.%d.log 86400”

What this does is…everyday a new error log and access log file will be created like error.2020.04.03.log and access.2020.04.03.log respectively.

To explore more option for the custom logging you can refer the apache project page http://httpd.apache.org/docs/current/programs/rotatelogs.html

export mysql database – mysql dump

When you have access to the command line and you have the export large database, you will not be able to export from phpmyadmin.

Hence mysql provide you handy method to export the database from the command line. Below are various options, you can use while exporting the database.

——databases – This allows you to specify the databases that you want to backup. You can also specify certain tables that you want to backup. If you want to do a full backup of all of the databases, then leave out this option
——add-drop-database – This will insert a DROP DATABASE statement before each CREATE DATABASE statement. This is useful if you need to import the data to an existing MySQL instance where you want to overwrite the existing data. You can also use this to import your backup onto a new MySQL instance, and it will create the databases and tables for you.
——triggers – this will include the triggers for each dumped table
——routines – this will include the stored routines (procedures and functions) from the dumped databases
——events – this will include any events from the dumped databases
——set-gtid-purged=OFF – since I am using replication on this database (it is the master), I like to include this in case I want to create a new slave using the data that I have dumped. This option enables control over global transaction identifiers (GTID) information written to the dump file, by indicating whether to add a SET @@global.gtid_purged statement to the output.
——user – The MySQL user name you want to use
——password – Again, you can add the actual value of the password (ex. ——password=mypassword), but it is less secure than typing in the password manually. This is useful for when you want to put the backup in a script, in cron or in Windows Task Scheduler.
——single-transaction – Since I am using InnoDB tables, I will want to use this option.
——no-create-db – don’t create database
——no-create-info – don’t create table structure
——extended-insert=FALSE => Each row as seperate insert querry

Syntax : mysqldump ——triggers ——routines ——databases databasename ——user=root ——password > database_export_file_name.sql
Example : mysqldump ——no-create-db ——triggers ——extended-insert=FALSE ——routines ——databases mydatabase ——user=root ——password  > mydatabase.sql

Sometime you have to type the absolute path for mysqldump executable path to execute the above command for example.

Example : /var/mysqlFolder/bin/mysqldump ——no-create-db ——triggers ——extended-insert=FALSE ——routines ——databases mydatabase ——user=root ——password  > mydatabase.sql

More option you can explore on Maria DB website

How to change the php version for the console

Many a times when you view the php version in the browser by displaying the phpinfo() information and the php version that is displayed when you see by typing the command “php -v” in the console or command prompt, You will notice that there is difference in the two.

So how  to set the php version same as the version that you see in your phpinfo( ) function in the browser.

Step 1: Find the path to the executable of the php from the phpinfo() displayed in the browser. For example, if you have ampps installed you will find the path as “/Applications/AMPPS/php-7.1/bin/php”. 

Incase you have multiple version of php configured then choose the binary/executable path to the required version of php.

For example for php5, the path would be “/Applications/AMPPS/php5/bin/php”.

Step 2: Setting the php version for the console

Once you have decided upon the required php version for your console application execute the below command.

alias php=’/Applications/AMPPS/php-7.1/bin/php’ => This will set your php version to 7.1 for you console command line instruction.

Similarly for php5

alias php=’/Applications/AMPPS/php5/bin/php’

To make this work,You need to double check the location of the required php executable path, then only it will work. If you don’t have the required version installed. you could installed it as per your need and the operating system you are using.

 

Ajax call using jquery

function makeAjaxRequest(data1,data2,.....,datax){
    $.ajax({
        'type':'POST',
        async: false,
        url: 'http://www.example.com/some_request_url',
        data:{param1:data1,param2:data2,....,paramx:datax},
        success : function(response) {
            console.log(response); // Using this you can check the posted data in browser console window
            return true;// you can process and return the response as required
            //location.reload(); // or you may reload the current page also
        },
        error: function (jqXHR, exception) {
            // If some error is returned, you can check the details below
            var msg = '';
            if (jqXHR.status === 0) {
                msg = 'Not connect.\n Verify Network.';
            } else if (jqXHR.status == 404) {
                msg = 'Requested page not found. [404]';
            } else if (jqXHR.status == 500) {
                msg = 'Internal Server Error [500].';
            } else if (exception === 'parsererror') {
                msg = 'Requested JSON parse failed.';
            } else if (exception === 'timeout') {
                msg = 'Time out error.';
            } else if (exception === 'abort') {
                msg = 'Ajax request aborted.';
            } else {
                msg = 'Uncaught Error.\n' + jqXHR.responseText;
            }
            $('#post').html(msg); // return the error response in your html page or process it further as required
        }
    });
}

 

How to download latest copy of a file from gitlab branch

I had code on my gitlab repository, Another person is also working on the same code . He had committed , pushed and merged his changes on the master branch. Now i just have to update only one file in my local working copy.

So this is possible by using the below two command.

git fetch
// git fetch will download all the recent changes, but it will not put it in your current checked out code (working area).

git checkout origin/masterpath/to/file
// git checkout <local repo name (default is origin)>/<branch name> — path/to/file will checkout the particular file from the downloaded changes (origin/master).

You can also pull specific files to your working copy from another branch as well. You just need to replace “origin/master” with your desired branch name.

When you fire git status command

git status
// it will show the fetched files as modified

Yii2 how to set custom value for checkbox in gridview widget

In Yii2, while you use gridview widget to display your table data, for performing any operation on the record by selecting the checkbox, gridview assign the value of the first column retrieved from your the result set.

But you need to set some different value to the checkbox, so to do that you can use the below code

GridView::widget([
	'dataProvider' => $dataProvider,
	'filterModel' => $searchModel,
	'columns' => [
		['class' => 'yii\grid\SerialColumn'],
		[
			'class' => '\kartik\grid\CheckboxColumn',
			'checkboxOptions' => function($model, $key, $index, $widget) {
				return ["value" => $model['id']]; // this can be substituted with any column value of your result data
			},
		],
		'name',
		['class' => 'yii\grid\ActionColumn'],
	],
]);

instead of the default one

GridView::widget([
	'dataProvider' => $dataProvider,
	'filterModel' => $searchModel,
	'columns' => [
		['class' => 'yii\grid\SerialColumn'],
		[
			'class' => '\kartik\grid\CheckboxColumn',
			'mergeHeader'=>false
		],
		'name',
		['class' => 'yii\grid\ActionColumn'],
	],
]);

issue with submit form in ajax success response

Usually when we try to submit the form after ajax call on success response, the form does not’t get submitted.

Like for example in below code:-

$.ajax({
type : “POST”,
url : “to/some/url”,
data : {
userName:userName,
mobileNumber:mobileNumber,
otp:otp
},
dataType : “json”,
success : function(data)
{
if(data.result == true) {
jQuery(“#form_id”).submit();
}else {
return false;
}
}
});

Now why this occur. Since you are calling the submit function from the ajax response, you need to remove the “submit” handler before submitting the form again. I.E. You need to submit the form without doing the ajax call again. Refer below:-

$.ajax({
type : “POST”,
url : “to/some/url”,
data : {
userName:userName,
mobileNumber:mobileNumber,
otp:otp
},
dataType : “json”,
success : function(data)
{
if(data.result == true) {
// Submit this form without doing the ajax call again
jQuery(“#form_id”).unbind().submit();
}else {
return false;
}
}
});