Add Custom css in wordpress

You can use the following code for add custom CSS in WordPress. add your styles in commented part.

add_action(‘admin_head’, ‘my_study_style’);
function my_study_style()
{
//add your styles here
}

Have any doubt, then comment here!

Show All Categories as Links in WordPress

You can use the function get_the_category_list() for this process.

<?php
$categories = get_the_category();
$separator = ' ';
$output = '';
if($categories){
	foreach($categories as $category) {
		$output .= '<a href="'.get_category_link( $category->term_id ).'" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '">'.$category->cat_name.'</a>'.$separator;
	}
echo trim($output, $separator);
}
?>

For more : http://codex.wordpress.org/Template_Tags/get_the_category

Get All Images From WordPress Media Gallery

Uploaded images are stored as posts with the type “attachment”. Use get_posts() and query for all attachments:

$args = array(
                'post_type' => 'attachment',
                'numberposts' => -1,
                'post_mime_type' =>'image',
                'post_status' => 'inherit',
                'post_parent' => null, // any parent
           );
$attachments = get_posts($args);
if ($attachments) {
    foreach ($attachments as $post) {
         setup_postdata($post);
         the_title();
         the_attachment_link($post->ID, false);
         the_excerpt();
     }
}

Now All images are displayed.

Have any doubt, then comment here!

create an autocomplete textbox in wordpress

Just add a div under the input tag

HTML Code:

<input type="text" id="city" name="city" autocomplete="off"/> 
<div id="key"></div>

replace the div after the success on you ajax.

Ajax Code:

     var ajaxurl="<?php echo admin_url( 'admin-ajax.php' ); ?>"; 
     var data ={ action: "city_action",  city:cid    };
        $.post(ajaxurl, data, function (response){
                     $('#key').html(response);
           });

PHP Code:

       function city_action_callback() {     
       global $wpdb;
            $city=$_GET['city'];
            $result =   $mytables=$wpdb->get_results("select * from ".$wpdb->prefix . "mycity where city like '%".$city."'" );   
            $data = "";
            echo '<ul>'
            foreach($result as $dis)
            {
                         echo '<li>'.$dis->city.'</li>';
            }
            echo '</ul>'    
         die();
       }

Have any doubt, then comment here!

Get category ID by using category name in wordpress

If you want to get category id by using category name then use the following code

function get_category_id($cat_name){
	$term = get_term_by('name', $cat_name, 'category');
	return $term->term_id;
}

then Just call the function with your category name as a parameter. for example

$category_ID = get_category_id('Books');

Now you can get the category Id in variable $category_ID.

Have any doubt, then comment here!