Block Visibility Conditions in Drupal


While dealing with “Block” in Drupal, you have many choice regarding its display. Like, in simple words where to display,for which conditions,for which users,for which roles.etc..  So, in this post you will learn about such useful conditions.We called it as “Block Visibility Conditions”.

General Way of providing block permissions


If your block was created from a view (if not then you can create one) ,then the access settings can be set in the view edit mode:


Now you can simply select the permissions to access the block.Users having the selected permission will be able to access this display.

Click on the little 'cog-wheel' to the right of the 'Access' row under the view's basic settings in order to select the restriction you desire: 



Attention :  Please see the comment below the 'Default Access Options' list as shown in the above image.

If you want to remove 'access all views' for the anonymous user,you can do it from  '/admin/user/permissions' and then set the permissions of your other views also. This gives more control over who sees what. Views by default have 'Access' set to 'Unrestricted' generally.

Display the block only to logged-in users.



<?php
global $user;
if ($user->uid) {
    return true;
} else {
    return false;
}
?>

Showing a block only to certain Users.



<?php
global $user;
if ($user->uid == 31) {
    return "This block is only visible for the user with the user-ID 31.";
} else {
    return;
}
?>

If you want to allow more than one User



<?php
global $user;
if ($user->uid == 11 || $user->uid == 21 || $user->uid == 31) {
    return "This block is only visible for the users having user-ID 11,21,31.";
} else {
    return;
}
?>

Show block on specific node type.


For this case, there are two codes you can use any of them.

Code :1

Here, just replace “Example” with your node type.


<?php
$nodeType = " Example";
if (arg(0) == 'node' AND is_numeric(arg(1)) AND arg(2) == FALSE) 
{
    $node = node_load(arg(1)); 
    if ( ($node->type == $nodeType) OR ($node->nid == 1) ) 
{
      return true;    
}
}
return FALSE;
?>

Code : 2


<?php  
// Only show if $return is true  
$return = FALSE;  
// Matching current node type with Example  
if ((arg(0) == 'node') AND is_numeric(arg(1)))  
{  
  $nid  = arg(1);  
  $node  = node_load($nid);   
  $type  = $node->type;   
    if($type == " Example")
     {  
      $return = TRUE;  
     }  
}  
return $return;  
?>  

Showing to specific roles only(Pre-Defined) in Drupal



<?php
global $user;
$output = '';
if (in_array('admin user',$user->roles)) {
  return true; 
}
else
{
return false;
}
?>

Showing block only when the Admin is logged in



<?php
global $user;
if (($user->uid) == 1) {
return true;
} else {
return false;
}
?>

Showing for a certain content type and node ID:



<?php
// Only show block from types array and nodes array
$match = FALSE;
// Which node types
$types = array('page' => 1);
// Which nodes (by nid)
$nodes = array(1, 2);
if (arg(0) == 'node' && is_numeric(arg(1))) {
  $nid  =  arg(1); 
  $node  =  node_load(array('nid' => $nid));
  $type  =  $node->type;
  if (isset($types[$type]) && in_array($nid, $nodes)) {
        $match = TRUE;
  }
}
return $match;
?>

Show block only on User profile



<?php
  // dont show on edit pages
  $args = arg();
    if (count($args) > 2) {
      return FALSE;
    }
    // Visible only on  yoursite/user/uid where uid is the user id
  if ($args[0] == 'user') {
    return TRUE;
  }
?>

Display block for all conditions  like node/(anything) but not for node/25 and node/28 (specific)



<?php
/* you can define a list of pages to include one per line */
$include = "node/*";

/* you can define a list of pages to exclude one per line */
$exclude = "node/25
node/28";


/* ----------- DON'T  MAKE ANY CHANGES IN THE BELOW CODE ----------- */
$match = FALSE;
$path = drupal_get_path_alias($_GET['q']);
$regexp = '/^('. preg_replace(array('/(\r\n?|\n)/', '/\\\\\*/', '/(^|\|)\\\\<front\\\\>($|\|)/'), array('|', '.*', '\1'. preg_quote(variable_get('site_frontpage', 'node'), '/') .'\2'), preg_quote($include, '/')) .')$/';
if (preg_match($regexp, $path)) {
  $regexp = '/^('. preg_replace(array('/(\r\n?|\n)/', '/\\\\\*/', '/(^|\|)\\\\<front\\\\>($|\|)/'), array('|', '.*', '\1'. preg_quote(variable_get('site_frontpage', 'node'), '/') .'\2'), preg_quote($exclude, '/')) .')$/';
  if (!preg_match($regexp, $path)) {
    $match = TRUE;
  }
}
return $match;
?>

Showing block for certain  node ID’s



<?php
$match = FALSE;
//Matching  which nodes (using nid)
$nodes = array(9, 28);
if (arg(0) == 'node' && is_numeric(arg(1))) {
  $nid = arg(1);
  $node = node_load(array('nid' => $nid));
    if ( in_array($nid, $nodes)) {
        $match = TRUE;
  }
}
return $match;
?>


Comments

Post a Comment

Popular posts from this blog

How to construct a B+ tree with example

Image
A B+ tree contains n-1 search key values K1K2…….Kn-1 and have n pointers.   In a B+ tree the data are ordered  sequentially.  The leaf node may hold up to n pointers and must hold at least N/2 pointers. The root node must hold at least two pointers, unless the tree consists of only one node.  Now we construct a B+ tree. Construct a B+ tree for the following set of key values: (2,3,5,7,11,17,19,23,29,31) Assume that the tree is initially empty and values are added in ascending order. Construct a B+ tree where the pointer number is Four. Solution: When a node exceeds n-1 search key value then we split it into two nodes. First node contains (ceiling(n-1)/2) values.  2 nd node contains remaining node. Copy the smallest search key value of the second node to the parent node. Let's start, we know each node has N pointer and has N-1 search key values. In our example pointer number is 4, so the search key value is 4-1=3. So each node has 4 pointers and 3 search key value. The first node i
Read more

How to show only month and year fields in android Date-picker?

Image
Android default DatePicker show day/month/year fields but you have to customize this DatePicker as your requirements. Suppose that you want to show only month and year fields in android datepicker . To do this, you have to customize the Dialog DatePicker source code but it is not an easy task. In this tutorial I will show you a tricky way to solve this problem. Lets see how to show only month and year field in android DatePicker as a dialog.   Step to show only month and year fields in android date-picker: Some days ago I got this same problem and here I am trying to explain this in a sequential manner. I want to show a dialog datepicker when user click on an EditText. So if user click on EditText, A dialog datepicker will be invocked and it will show only month and year fields. To do this, at first we have to create a xml layout to hold the EditText fields. So create an android project and name it DatePickerExample. In the main.xml file just try to write this simple code.  main.xml
Read more

Visitor Counter Script Using PHP

Image
If you have noticed that many websites display their total numbers of visitors.In this tutorial I am going to explain you how to create a simple visitor counter using php. For this, 1) Create one table called “visitor_counter” in your database. 2) Create file named “counter.php”. Step1: Creating “visitor_counter” Table CREATE TABLE `visitor_counter` ( `counts` int(10) NOT NULL default '0' ) Step2: Creating “counter.php” File <?php  // Database Details $host="localhost"; $username="root"; $password=""; $db_name="test"; $tbl_name="visitor_counter"; // Connect to server and select database. mysql_connect("$host", "$username", "$password")or die("cannot connect to server "); mysql_select_db("$db_name")or die("cannot select DB");  $sql="SELECT * FROM $tbl_name"; $result=mysql_query($sql); $rows=mysql_fetch_array($result); $counter=$rows['counts']; // se
Read more