I have a requirement where the number of checkboxes outputted in the metabox is not fixed. Had it been fixed, I could've followed any one of the tutorials on the internet which suggests I name each checkbox and save it using update_post_meta()
In my case, I have named the checkbox in array notation as name = 'multval[]' since the number of checkboxes is unknown.
I'm failing to understand how to use:
get_post_meta()checked()update_post_meta()
when it comes to accessing checkboxes when it is named as an array.
The Code:
<?php
add_action( 'add_meta_boxes', function() {
add_meta_box( 'custom-metabox', 'Select values', 'fill_metabox', 'post', 'normal' );
});
function fill_metabox( $post ) {
wp_nonce_field( basename(__FILE__), 'mam_nonce' );
// How to use 'get_post_meta()' for multiple checkboxes as array?
$elements = get_elements(); //returns an associative array
foreach ( $elements as $element) {
?>
<p>
<input
type = "checkbox"
name = "multval[]"
value = <?php echo $element;?>
//How to use checked() function in case of
//multiple checkbox as arrays
>
<?php echo $element;?>
</p>
<?php
}
}
add_action( 'save_post', function( $post_id ) {
$is_autosave = wp_is_post_autosave( $post_id );
$is_revision = wp_is_post_revision( $post_id );
$is_valid_nonce = ( isset( $_POST[ 'mam_nonce' ] ) && wp_verify_nonce( $_POST[ 'mam_nonce' ], basename( __FILE__ ) ) ) ? 'true' : 'false';
if ( $is_autosave || $is_revision || !$is_valid_nonce ) {
return;
}
/*How to run a loop to save values for each checkbox?*/
});
I have a requirement where the number of checkboxes outputted in the metabox is not fixed. Had it been fixed, I could've followed any one of the tutorials on the internet which suggests I name each checkbox and save it using update_post_meta()
In my case, I have named the checkbox in array notation as name = 'multval[]' since the number of checkboxes is unknown.
I'm failing to understand how to use:
get_post_meta()checked()update_post_meta()
when it comes to accessing checkboxes when it is named as an array.
The Code:
<?php
add_action( 'add_meta_boxes', function() {
add_meta_box( 'custom-metabox', 'Select values', 'fill_metabox', 'post', 'normal' );
});
function fill_metabox( $post ) {
wp_nonce_field( basename(__FILE__), 'mam_nonce' );
// How to use 'get_post_meta()' for multiple checkboxes as array?
$elements = get_elements(); //returns an associative array
foreach ( $elements as $element) {
?>
<p>
<input
type = "checkbox"
name = "multval[]"
value = <?php echo $element;?>
//How to use checked() function in case of
//multiple checkbox as arrays
>
<?php echo $element;?>
</p>
<?php
}
}
add_action( 'save_post', function( $post_id ) {
$is_autosave = wp_is_post_autosave( $post_id );
$is_revision = wp_is_post_revision( $post_id );
$is_valid_nonce = ( isset( $_POST[ 'mam_nonce' ] ) && wp_verify_nonce( $_POST[ 'mam_nonce' ], basename( __FILE__ ) ) ) ? 'true' : 'false';
if ( $is_autosave || $is_revision || !$is_valid_nonce ) {
return;
}
/*How to run a loop to save values for each checkbox?*/
});
1 Answer
Reset to default 7Try the following code.
add_action( 'add_meta_boxes', function() {
add_meta_box( 'custom-metabox', 'Select values', 'fill_metabox', 'post', 'normal' );
});
function fill_metabox( $post ) {
wp_nonce_field( basename(__FILE__), 'mam_nonce' );
// How to use 'get_post_meta()' for multiple checkboxes as array?
$postmeta = maybe_unserialize( get_post_meta( $post->ID, 'elements', true ) );
// Our associative array here. id = value
$elements = array(
'apple' => 'Apple',
'orange' => 'Orange',
'banana' => 'Banana'
);
// Loop through array and make a checkbox for each element
foreach ( $elements as $id => $element) {
// If the postmeta for checkboxes exist and
// this element is part of saved meta check it.
if ( is_array( $postmeta ) && in_array( $id, $postmeta ) ) {
$checked = 'checked="checked"';
} else {
$checked = null;
}
?>
<p>
<input type="checkbox" name="multval[]" value="<?php echo $id;?>" <?php echo $checked; ?> />
<?php echo $element;?>
</p>
<?php
}
}
add_action( 'save_post', function( $post_id ) {
$is_autosave = wp_is_post_autosave( $post_id );
$is_revision = wp_is_post_revision( $post_id );
$is_valid_nonce = ( isset( $_POST[ 'mam_nonce' ] ) && wp_verify_nonce( $_POST[ 'mam_nonce' ], basename( __FILE__ ) ) ) ? 'true' : 'false';
if ( $is_autosave || $is_revision || !$is_valid_nonce ) {
return;
}
// If the checkbox was not empty, save it as array in post meta
if ( ! empty( $_POST['multval'] ) ) {
update_post_meta( $post_id, 'elements', $_POST['multval'] );
// Otherwise just delete it if its blank value.
} else {
delete_post_meta( $post_id, 'elements' );
}
});