Limit the number of Tags added to a Post

Maybe..

<script type="text/javascript"><!--
	jQuery("form#post").submit(function($){
		var ln = $("ul#categorychecklist input:checkbox:checked").length;
		var tag_ln = $('.tagchecklist span').length;
		if ( ln > 1 ) {
			alert("<?php _e('Attention! You can select only ONE category.', 'article-directory'); ?>");
			return false;
		}
		if( tag_ln > 3 ) {
			alert("<?php _e('Attention! Too many tags, please provide no more than three tags.', 'article-directory'); ?>");
			return false;
		}
		return true;
	});
	jQuery('#categorychecklist label').click(function($){
		var ln = $("ul#categorychecklist input:checkbox:checked").length;
		if ( ln > 1 ) {
			alert("<?php _e('Attention! You can select only ONE category.', 'article-directory'); ?>");
			return false;
		}
		return true;
	});
//--></script>

Does that help? 🙂

Hi,

This works for me…

<script type="text/javascript">
/* <![CDATA[ */
jQuery(document).ready( function( $wpjq ) {
	$wpjq("form#post").submit( function() {
		var ln = $wpjq("#categorychecklist input:checkbox:checked").length;
		if ( ln > 1 )
		{
			// Uncheck the categories
			$wpjq("ul#categorychecklist input:checkbox:checked").attr( 'checked',false );
			// Hide the ajax loading image (gets fired when you hit the publish/update button)
			$wpjq("#ajax-loading").hide();
			// Remove the class that disables the publish/update button after it's clicked
			$wpjq("#publish").removeClass('button-primary-disabled');
			// Now fire off the alert
			alert("<?php _e('Attention! You can select only ONE category.', 'article-directory'); ?>");
			// And return false
			return false;
		}
	});
	$wpjq('#categorychecklist label').click( function() {
		var ln = $wpjq("#categorychecklist input:checkbox:checked").length;
		if ( ln > 1 )
		{
			alert("<?php _e('Attention! You can select only ONE category.', 'article-directory'); ?>");
			return false;
		}
	});
});
/* ]]> */
</script>

Meant to do both, but copied the first part and forgot about the second bit.. *oops*

Did the category code work ok?, i did some moderate testing and it seemed to work just fine..

I’ll have a look at the tag code for you when i’m back at my main PC… 😉

I’ve simply used the tag code from my previous response, working it into the code i posted above..

<script type="text/javascript">
/* <![CDATA[ */
jQuery(document).ready( function( $wpjq ) {
	$wpjq("form#post").submit( function() {
		var ln = $wpjq("#categorychecklist input:checkbox:checked").length;
		var tag_ln = $wpjq('.tagchecklist span').length;
		if ( ln > 1 )
		{
			// Uncheck the categories
			$wpjq("ul#categorychecklist input:checkbox:checked").attr( 'checked',false );

			// Hide the ajax loading image (gets fired when you hit the publish/update button)
			$wpjq("#ajax-loading").hide();

			// Remove the class that disables the publish/update button after it's clicked
			$wpjq("#publish").removeClass('button-primary-disabled');

			// Now fire off the alert
			alert("<?php _e('Attention! You can select only ONE category.', 'article-directory'); ?>");

			// And return false
			return false;
		}
		if( tag_ln > 3 )
		{
			// Hide the ajax loading image (gets fired when you hit the publish/update button)
			$wpjq("#ajax-loading").hide();

			// Remove the class that disables the publish/update button after it's clicked
			$wpjq("#publish").removeClass('button-primary-disabled');

			// Now fire off the alert
			alert("<?php _e('Attention! Too many tags, please provide no more than three tags.', 'article-directory'); ?>");

			// And return false
			return false;
		}
	});
	$wpjq('#categorychecklist label').click( function() {
		var ln = $wpjq("#categorychecklist input:checkbox:checked").length;
		if ( ln > 1 )
		{
			alert("<?php _e('Attention! You can select only ONE category.', 'article-directory'); ?>");
			return false;
		}
	});

});
/* ]]> */
</script>

🙂

Easy peasy, but easy is relative to the person.. i like jQuery because it’s pretty easy for anyone familiar with PHP and/or CSS, much nicer/easier to write then regular old Javascript.. (although it is essentially Javascript)

Happy i could help Bob.. 😉