Datepicker and a Widget

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Last week, I worked on making a plugin that would safely and smartly allow for a date selection, and not permit people to put in junk data. I had my code ‘clean’ and only accepted good data, there was one question remaining. How do I make it look GOOD?

Let’s be honest, pretty data matters. If things look good, people use them. It’s that simple. This let me play with another aspect of coding that I don’t generally look at. Javascript.

What Code Do I Need?

There are a lot of ways to tackle this kind of problem. If you wanted to just list the months and days, and have those be drop-downs, you could do that. The option I went with was to have a calendar date-picker pop up, as I felt that would visually explain what the data should be.

To do that I needed a date picker jQuery script (which is included in WordPress core) and a second script to format the output.

My Script

This part is really small:

jQuery(function() {
    jQuery( ".datepicker" ).datepicker({
        dateFormat : "mm-dd"

All it does is force the format to be “mm-dd” – so if you picked the date, that’s what it would be.

Enqueuing the Scripts

In order to make sure the scripts are only loaded on the widgets page, my enqueue function looks like this:

	public function admin_enqueue_scripts($hook) {
		if( $hook !== 'widgets.php' ) return;
		wp_enqueue_script( 'byq-onthisday', plugins_url( 'js/otd-datepicker.js', __FILE__ ), array( 'jquery-ui-datepicker' ), $this->version, true );
		wp_enqueue_style( 'jquery-ui', plugins_url( 'css/jquery-ui.css', __FILE__ ), array(), $this->version );

The CSS is because, by default, WordPress doesn’t include the jquery UI CSS.

Calling the Scripts

In the widget class, I have a function for the form output. In there, I have an input field with a class defined as datepicker, which is used by the jquery I wrote above, to know “I’m the one for you!”

	function form( $instance ) {
		$instance = wp_parse_args( (array) $instance, $this->defaults );
			<label for="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>"><?php _e( 'Title', 'bury-your-queers' ); ?>: </label>
			<input type="text" id="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'title' ) ); ?>" value="<?php echo esc_attr( $instance['title'] ); ?>" class="widefat" />

			<label for="<?php echo esc_attr( $this->get_field_id( 'date' ) ); ?>"><?php _e( 'Date (Optional)', 'bury-your-queers' ); ?>: </label>
			<input type="text" id="<?php echo esc_attr( $this->get_field_id( 'date' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'date' ) ); ?>" class="datepicker" value="<?php echo esc_attr( $instance['date'] ); ?>" class="widefat" />
			<br><em><?php _e( 'If blank, the date will be the current day.', 'bury-your-queers' ); ?></em>

Making it Pretty

To be honest, once I got the JS working, I left the default CSS alone. Why? Because I’m a monkey with a crayon when it comes to design. The default worked fine for me:

The Default Date Picker

It does make me think that it would be nice if WordPress included their own customize datepicker colors in the admin colors, but I understand why they don’t. Not everyone or even most people will ever need this.




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