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Attachment Taxonomy Multi-Select not saving

  • I have created a custom taxonomy for my Attachments called Image Tags slug =’imagetags’. I created a field with type taxonomy and turned on save, load and create and displayed as check boxes. Field name=”new_image_tags” The field shows up properly on all systems.

    If I click on the image in grid mode I can check as many as I want but it saves only the last checkbox not all of them. If I view it in list mode it saves all the checkboxes properly. I am assuming this is a glitch in ACF javascript that saves these in grid mode.

  • I’m having this same issue. Good to know you can work around in list view.

  • I found the issue and now it is about trying to find the solution.

    Open wp-includes/js/media-views.js
    Line: 8353

    _.each( this.$el.serializeArray(), function( pair ) {
        data[ ] = pair.value;

    This is the js code wordpress is using to collect the form data for submission. It effectively removes the array submitted. I submitted this as a bug on their forums but we will see how they reply.

  • This code fixes the WordPress save function. I have also submitted this as a bug so hopefully they fix it.

    add_action( 'admin_print_footer_scripts', 'mediaArrayFix', 11 );
    	function mediaArrayFix() {
    		// Make sure the media-views script has been enqueued.
    		if(!did_action( 'wp_enqueue_media' ) ){ return; }
    		<script> = function( event ) {
    			var data = {};
    			if ( event ) { event.preventDefault(); }
    			_.each( this.$el.serializeArray(), function( pair ) {
    				if ( /\[\]$/.test( ) ) {
    					if ( undefined === data[ ] ) { data[ ] = []; }
    					data[ ].push( pair.value );
    				}else{ data[ ] = pair.value; }
    			this.controller.trigger( 'attachment:compat:waiting', ['waiting'] );
    			this.model.saveCompat( data ).always( _.bind( this.postSave, this ) );
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