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Archive for November 2009

Adding scripts to the WordPress login or registration form

22nd November 2009

Most WP developers know by now that the right way to add script libraries from a plugin or theme is to use the wp_enqueue_script function. It makes sure scripts aren’t loaded more than once, and so on.

However, I just had some problems getting some jQuery to run on the login / registration form. I used wp_enqueue_script like a good WP developer but… no go. Where’s my jQuery?

It seems the answer lies in the fact that after scripts are enqueued in a normal WP page, they get spit out by something inside the call to wp_head(). I guess you could add wp_head() to the login header, but who wants all those redundant plugin scripts and styles that (presumably) aren’t even meant to be there.

After a bit of diggiing around it seems that the solution is the wp_print_scripts() function. So, to get jQuery working on the login form, put these lines in the code you hook onto login_head:

wp_enqueue_script( 'jquery' );
wp_print_scripts();

Permalink  |  Posted in WordPress, jQuery  |  No comments yet »  | 

Easy child page creation for WordPress

11th November 2009

Here’s a quickie that can help with WordPress sites that have a lot of pages. If some of the pages have longish titles, the “Parent Page” drop-down on the edit page screen can get unwieldy. The scroller for the drop-down can run off the right side of the screen.

OK, it’s fine (often easier) to use the keyboard to navigate drop-downs. But not everyone knows how to, and even so, with a large amount of pages, selecting the right parent can become a pain.

I think I adapted the following code from a plugin or someone else’s post. Thanks whoever you are, but frankly I’m so busy at the moment I’ve forgotten where it came from! Anyway, if you drop the following into your custom theme’s functions.php, you’ll get a new “Create child” link under every page listed in WP admin, when you hover over the title:

function slt_childPageAction( $actions, $page ) {
	$actions["create-child"] = '<a href="/wp-admin/page-new.php?parent_id=' . $page->ID . '" title="Create a new page with this page as its parent">Create child</a>';
	return $actions;
}
add_filter( 'page_row_actions', 'slt_childPageAction', 10, 2 );
function slt_setChildPage() {
	global $post;
	if ( $post->post_type == "page" && $post->post_parent == 0 && isset( $_GET["parent_id"] ) && is_numeric( $_GET["parent_id"] ) )
		echo '<script type="text/javascript">jQuery( document ).ready( function($) { $("#parent_id").val("' . $_GET["parent_id"] . '"); } );</script>';
}
add_action( 'edit_page_form', 'slt_setChildPage' );

The first bit adds the page action link. The second bit adds some jQuery to the right edit screen to set the specified parent, if it’s been passed. I couldn’t find another way to set the drop-down… Well, it works!

Permalink  |  Posted in WordPress  |  No comments yet »  | 

Formatting a string with optional elements

11th November 2009

I’ve often found myself writing little bits of code to format strings with optional elements. The classic example is outputting the company someone works for, together with their position in that company—if the position is given. The format if both are given is:

[position], [company]

If the position isn’t given, you just output the company. Without, obviously, the comma. It’s a trivial thing to code, but on a current project I’ve found myself doing it in several different places. Of course, this suggests there should be a function written for it.

Ideally the function should be able to cope with any number of optional elements. With PHP’s func_get_args(), it’s easy:

function formatOptionalText( $delimiter ) {
	$elements = array_slice( func_get_args(), 1 );
	$text = "";
	$i = 0;
	foreach ( $elements as $element ) {
		if ( trim ( $element ) ) {
			if ( $i && $text ) $text .= $delimiter;
			$text .= $element;
		}
		$i++;
	}
	return $text;
}

Note that you have to pass a delimiter first, and you should include a space if necessary (e.g. ", "). After that, pass any number of strings and they’ll be output without gaps.

Permalink  |  Posted in miscellaneous  |  1 comment »  | 

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