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/**

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 * jQuery support code for our forms

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 */

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(function($) {

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    /*

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     * Form field is empty - i.e. null value

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     *

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     * Pure whitespace also counts

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     */

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    $.fn.empty = function () {

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        return !this.val() || $.trim(this.val()) == "";

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    }

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    /**

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     * Query or set form field disabled state

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     */

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    $.fn.disabled = function (flag) {

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        if (flag == undefined)

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            // XXX: jQuery returns `true` here?

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            return !!this.attr("disabled");

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        if (flag)

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            this.attr("disabled", "disabled");

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        else

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            this.removeAttr("disabled");

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    }

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    $.fn.checked = function (flag) {

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        if (flag == undefined)

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            // XXX: jQuery returns true here?

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            return !!this.attr("checked");

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        if (flag)

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            this.attr("checked", "checked");

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        else

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            this.removeAttr("checked");

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    }

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    /*

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     * The given checkbox acts as an enable/disable toggle for this form control

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     */

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    $.fn.formEnabledBy = function (checkbox) {

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        var target = this;

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        checkbox.change(function () {

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            target.disabled(!checkbox.checked());

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        });

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        checkbox.change();

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    }

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    /*

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     * When non-zero <select>/<option> is selected, apply that option as pre-filled values for other form items

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     */

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        opts = $.extend({

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            // which option value is the "default", i.e. 'create new'

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            valueDefault: 0,

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            // which element to apply selected option value (id) to

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            valueTarget: null,

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            // which element to apply selected option text to

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            textTarget: null,

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        }, opts);

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        function update () {

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            // selected option value (i.e. id)

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            value = $(this).val();

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            // selected option text (i.e. title/name)

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            text = $.trim($(this).find("option:selected").text());

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            // fields to set

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            }

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            }

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        }

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        // update linked field state on update, and startup..

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        this.change(update);

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        this.change()

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    }

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})(jQuery);