Solved Populating a select in an admin template

[ferik]

I am able to set its value via settings.sync & data-key. Is there a way to directly map the data-options to a setting value?

If that's not possible, is the best way to retrieve the setting in the same method I do a settings.sync and set the options via JS?

[yariplus]

You can do that by registering a new settings plugin. Just add the registerPlugin call before you do your settings.sync()

In the plugin, map the name/value pairs to an array using jQuery, then add the current value to the array.

settings.registerPlugin({
	types: ['mySelect'], // This is your data-type for the <select>
	set: function (element, value, trim) {

		// Here we set the options based on the name/value pairs that were saved previously.
		element = $(element);
		if (value) value.forEach(function (mapping) {
			if (mapping.name === 'value') {
				element.val(mapping.value);
			}else{
				element.append('<option value="'+mapping.value+'">'+mapping.name+'</option>');
			}
		});

		//////////////////
		// Here you probably want to append any default options if they don't already exist.
		//////////////////
	},
	get: function (element, trim, empty) {

		// Here we get the mapping for saving into the database.
		element = $(element);
		var	value = [];
		element.children().each(function (i, option) {
			option = $(option);
			value.push({name:option.text(),value:option.attr('value')}); // Get the text and value of each <option>
		});
		value.push({name:'value',value:element.val()}); // Get the current value.
		// return the mapping.
		return value;
	}
});

In the template, you would just do this:

<select data-type="mySelect" data-key="something"></select>