christabor / flask_jsondash

/**

 * Bootstrapping functions, event handling, etc... for application.

 */

var jsondash = function() {

    var my = {

        chart_wall: null,

    };

    var MIN_CHART_SIZE   = 200;

    var dashboard_data   = null;

    var API_ROUTE_URL    = $('[name="dataSource"]');

    var API_PREVIEW      = $('#api-output');

    var API_PREVIEW_BTN  = $('#api-output-preview');

    var API_PREVIEW_CONT = $('.api-preview-container');

    var WIDGET_FORM      = $('#module-form');

    var VIEW_BUILDER     = $('#view-builder');

    var ADD_MODULE       = $('#add-module');

    var MAIN_CONTAINER   = $('#container');

    var EDIT_MODAL       = $('#chart-options');

    var DELETE_BTN       = $('#delete-widget');

    var DELETE_DASHBOARD = $('.delete-dashboard');

    var SAVE_WIDGET_BTN  = $('#save-module');

    var EDIT_CONTAINER   = $('#edit-view-container');

    var MAIN_FORM        = $('#save-view-form');

    var JSON_DATA        = $('#raw-config');

    var ADD_ROW_CONTS    = $('.add-new-row-container');

    var EDIT_TOGGLE_BTN  = $('[href=".edit-mode-component"]');

    var UPDATE_FORM_BTN  = $('#update-module');

    var CHART_TEMPLATE   = $('#chart-template');

    var ROW_TEMPLATE     = $('#row-template').find('.grid-row');

    function Widgets() {

        var self = this;

        self.widgets = {};

        self.container = MAIN_CONTAINER.selector;

        self.all = function() {

            return self.widgets;

        };

        self.add = function(config) {

            self.widgets[config.guid] = new Widget(self.container, config);

            return self.widgets[config.guid];

        };

        self.addFromForm = function() {

            return self.add(self.newModel());

        };

        self._delete = function(guid) {

            delete self.widgets[guid];

        };

        self.get = function(guid) {

            return self.widgets[guid];

        };

        self.getByEl = function(el) {

            return self.get(el.data().guid);

        };

        self.getAllOfProp = function(propname) {

            var props = [];

            $.each(self.all(), function(i, widg){

                props.push(widg.config[propname]);

            });

            return props;

        };

        self.newModel = function() {

            var config = getParsedFormConfig();

            var guid   = jsondash.util.guid();

            config['guid'] = guid;

            config['family'] = WIDGET_FORM.find('[name="type"]').find('option:selected').data().family;

            if(!config.refresh || !refreshableType(config.type)) {config['refresh'] = false;}

            if(!config.override) {config['override'] = false;}

            return config;

        };

    }

    function Widget(container, config) {

        // model for a chart widget

        var self = this;

        self.config = config;

        self.guid = self.config.guid;

        self.container = container;

        self._refreshInterval = null;

        self._makeWidget = function(config) {

            if(document.querySelector('[data-guid="' + config.guid + '"]')){

                return d3.select('[data-guid="' + config.guid + '"]');

            }

            return d3.select(self.container).select('div')

                .append('div')

                .classed({item: true, widget: true})

                .attr('data-guid', config.guid)

                .attr('data-refresh', config.refresh)

                .attr('data-refresh-interval', config.refreshInterval)

                .style('width', config.width + 'px')

                .style('height', config.height + 'px')

                .html(d3.select(CHART_TEMPLATE.selector).html())

                .select('.widget-title .widget-title-text').text(config.name);

        };

        // d3 el

        self.el = self._makeWidget(config);

        // Jquery el

        self.$el = $(self.el[0]);

        self.init = function() {

            // Add event handlers for widget UI

            self.$el.find('.widget-refresh').on('click.charts', refreshWidget);

                self.delete();

            });

            // Allow swapping of edit/update events

            // for the edit button and form modal

            self.$el.find('.widget-edit').on('click.charts', function(){

                SAVE_WIDGET_BTN

                .attr('id', UPDATE_FORM_BTN.selector.replace('#', ''))

                .text('Update widget')

                .off('click.charts.save')

                .on('click.charts', onUpdateWidget);

            });

            if(self.config.refresh && self.config.refreshInterval) {

                self._refreshInterval = setInterval(function(){

                    loadWidgetData(my.widgets.get(self.config.guid));

                }, parseInt(self.config.refreshInterval, 10));

            }

            if(my.layout === 'grid') {

                updateRowControls();

            }

        };

        self.init();

        self.getInput = function() {

            // Get the form input for this widget.

            return $('input[id="' + self.guid + '"]');

        };

        self.delete = function(bypass_confirm) {

            if(!bypass_confirm){

                if(!confirm('Are you sure?')) {

                    return;

                }

            }

            var row = self.$el.closest('.grid-row');

            clearInterval(self._refreshInterval);

            // Delete the input

            self.getInput().remove();

            // Delete the widget

            self.el.remove();

            // Remove reference to the collection by guid

            my.widgets._delete(self.guid);

            EDIT_MODAL.modal('hide');

            // Redraw wall to replace visual 'hole'

            if(my.layout === 'grid') {

                // Fill empty holes in this charts' row

                fillEmptyCols(row);

                updateRowControls();

            }

            // Trigger update form into view since data is dirty

            EDIT_CONTAINER.collapse('show');

            // Refit grid - this should be last.

            fitGrid();

        };

        self.addGridClasses = function(sel, classes) {

            d3.map(classes, function(colcount){

                var classlist = {};

                classlist['col-md-' + colcount] = true;

                classlist['col-lg-' + colcount] = true;

                sel.classed(classlist);

            });

        };

        self.removeGridClasses = function(sel) {

            var bootstrap_classes = d3.range(1, 13);

            d3.map(bootstrap_classes, function(i){

                var classes = {};

                classes['col-md-' + i] = false;

                classes['col-lg-' + i] = false;

                sel.classed(classes);

            });

        };

        self.update = function(conf, dont_refresh) {

                /**

             * Single source to update all aspects of a widget - in DOM, in model, etc...

             */

            var widget = self.el;

            // Update model data

            self.config = $.extend(self.config, conf);

            // Trigger update form into view since data is dirty

            // Update visual size to existing widget.

            loader(widget);

            widget.style({

                height: self.config.height + 'px',

                width: my.layout === 'grid' ? '100%' : self.config.width + 'px'

            });

            if(my.layout === 'grid') {

                // Extract col number from config: format is "col-N"

                var colcount = self.config.width.split('-')[1];

                var parent = d3.select(widget.node().parentNode);

                // Reset all other grid classes and then add new one.

                self.removeGridClasses(parent);

                self.addGridClasses(parent, [colcount]);

            }

            widget.select('.widget-title .widget-title-text').text(self.config.name);

            // Update the form input for this widget.

            self._updateForm();

            if(!dont_refresh) {

                EDIT_CONTAINER.collapse();

                // Refit the grid

                fitGrid();

            } else {

                unload(widget);

            }

        };

        self._updateForm = function() {

            self.getInput().val(JSON.stringify(self.config));

        };

    }

    /**

     * [fillEmptyCols Fill in gaps in a row when an item has been deleted (fixed grid only)]

     */

    function fillEmptyCols(row) {

        row.each(function(_, row){

            var cols = $(row).find('> div');

            cols.filter(function(i, col){

                return $(col).find('.item.widget').length === 0;

            }).remove();

        });

    }

    function togglePreviewOutput(is_on) {

        if(is_on) {

            API_PREVIEW_CONT.show();

            return;

        }

        API_PREVIEW_CONT.hide();

    }

    function previewAPIRoute(e) {

        e.preventDefault();

        // Shows the response of the API field as a json payload, inline.

        $.ajax({

            type: 'get',

            url: API_ROUTE_URL.val().trim(),

            success: function(data) {

                API_PREVIEW.html(prettyCode(data));

            },

            error: function(data, status, error) {

                API_PREVIEW.html(error);

            }

        });

    }

    function refreshableType(type) {

        if(type === 'youtube') {return false;}

        return true;

    }

    function validateWidgetForm() {

        var is_valid = true;

        var url_field = WIDGET_FORM.find('[name="dataSource"]');

        WIDGET_FORM.find('[required]').each(function(i, el){

            if($(el).val() === '') {

                $(el).parent().addClass('has-error').removeClass('has-success');

                is_valid = false;

                return false;

            } else {

            }

        });

        // Validate youtube videos

        if(WIDGET_FORM.find('[name="type"]').val() === 'youtube') {

            if(!url_field.val().startsWith('<iframe')) {

                url_field.parent().addClass('has-error');

                return false;

            }

        }

        return is_valid;

    }

        if(!(validateWidgetForm())) {

            return false;

        }

        var new_config = my.widgets.newModel();

        // Remove empty rows and then update the order so it's consecutive.

        $('.grid-row').not('.grid-row-template').each(function(i, row){

            // Delete empty rows - except any empty rows that have been created

            // for the purpose of this new chart.

            if($(row).find('.item.widget').length === 0 && new_config.row !== i + 1) {

                $(row).remove();

            }

        });

        // Update the row orders after deleting empty ones

        updateRowOrder();

        var newfield = $('<input class="form-control" type="text">');

        // Add a unique guid for referencing later.

        newfield.attr('name', 'module_' + new_config.id);

        newfield.val(JSON.stringify(new_config));

        $('.modules').append(newfield);

        // Save immediately.

    }

    function isModalButton(e) {

        return e.relatedTarget.id === ADD_MODULE.selector.replace('#', '');

    }

    function isRowButton(e) {

        return $(e.relatedTarget).hasClass('grid-row-label');

    }

    function clearForm() {

        WIDGET_FORM.find('label')

        .removeClass('has-error')

        .removeClass('has-success')

        .find('input, select')

        .each(function(_, input){

            $(input).val('');

        });

    }

    function deleteRow(row) {

            var guid = $(this).data().guid;

        });

        // Remove AFTER removing the charts contained within

        row.remove();

        updateRowOrder();

    }

    function populateEditForm(e) {

        // If the modal caller was the add modal button, skip populating the field.

        API_PREVIEW.text('...');

        clearForm();

        if(isModalButton(e) || isRowButton(e)) {

            DELETE_BTN.hide();

            if(isRowButton(e)) {

                var row = $(e.relatedTarget).data().row;

                populateRowField(row);

                // Trigger the order field update based on the current row

                WIDGET_FORM.find('[name="row"]').change();

            } else {

                populateRowField();

            }

            return;

        }

        DELETE_BTN.show();

        // Updates the fields in the edit form to the active widgets values.

        var item = $(e.relatedTarget).closest('.item.widget');

        var guid = item.data().guid;

        var widget = my.widgets.get(guid);

        var conf = widget.config;

        populateRowField(conf.row);

        // Update the modal fields with this widgets' value.

        $.each(conf, function(field, val){

            if(field === 'override' || field === 'refresh') {

                WIDGET_FORM.find('[name="' + field + '"]').prop('checked', val);

            } else {

                WIDGET_FORM.find('[name="' + field + '"]').val(val);

            }

        });

        // Update with current guid for referencing the module.

        WIDGET_FORM.attr('data-guid', guid);

        populateOrderField(widget);

        // Update form for specific row if row button was caller

        // Trigger event for select dropdown to ensure any UI is consistent.

        // This is done AFTER the fields have been pre-populated.

        WIDGET_FORM.find('[name="type"]').change();

    }

    function populateRowField(row) {

        var rows_field = $('[name="row"]');

        var num_rows = $('.grid-row').not('.grid-row-template').length;

        // Don't try and populate if not in freeform mode.

        if(my.layout === 'freeform') {return;}

        if(num_rows === 0){

            addNewRow();

        }

        rows_field.find('option').remove();

        // Add new option fields - d3 range is exclusive so we add one

        d3.map(d3.range(1, num_rows + 1), function(i){

            var option = $('<option></option>');

            option.val(i).text('row ' + i);

            rows_field.append(option);

        });

        // Update current value

        if(row) {rows_field.val(row)};

    }

    /**

     * [populateOrderField Destroy and re-create order dropdown input based on number of items in a row, or in a dashboard.]

     */

    function populateOrderField(widget) {

        // Add the number of items to order field.

        var order_field = WIDGET_FORM.find('[name="order"]');

        var max_options = 0;

        if(my.layout === 'grid') {

            if(!widget) {

                var row = WIDGET_FORM.find('[name="row"]').val();

                // Get the max options based on the currently selected value in the row dropdown

                // We also add one since this is "adding" a new item so the order should include

                // one more than is currently there.

                max_options = $('.grid-row').eq(row - 1).find('.item.widget').length + 1;

            } else {

                // Get parent row and find number of widget children for this rows' order max

                max_options = $(widget.el[0]).closest('.grid-row').find('.item.widget').length;

            }

        } else {

            var widgets = $('.item.widget');

            max_options = widgets.length > 0 ? widgets.length + 1 : 2;

        }

        order_field.find('option').remove();

        // Add empty option.

        order_field.append('<option value=""></option>');

        d3.map(d3.range(1, max_options + 1), function(i){

            var option = $('<option></option>');

            option.val(i).text(i);

            order_field.append(option);

        });

        order_field.val(widget && widget.config ? widget.config.order : '');

    }

    /**

     * [getParsedFormConfig Get a config usable for each json widget based on the forms active values.]

     * @return {[object]} [The serialized config]

     */

    function getParsedFormConfig() {

        var conf = {};

        WIDGET_FORM.find('.form-control').each(function(_, input){

            var name = $(input).attr('name');

            var val = $(input).val();

            if(name === 'override' ||

                name === 'refresh') {

                // Convert checkbox to json friendly format.

                conf[name] = $(input).is(':checked');

            } else if(name === 'refreshInterval' ||

                      name === 'row' ||

                      name === 'height' ||

                      name === 'order') {

                conf[name] = parseInt(val, 10);

                if(isNaN(conf[name])) {

                    conf[name] = null;

                }

            } else {

                conf[name] = val;

            }

            // This is not amenable to integer parsing

            if(name === 'width' && my.layout === 'grid') {

                conf['width'] = val;

            }

        });

        return conf;

    }

        var guid = WIDGET_FORM.attr('data-guid');

        var widget = my.widgets.get(guid);

        var conf = getParsedFormConfig();

        widget.update(conf);

    }

    function refreshWidget(e) {

        e.preventDefault();

        loadWidgetData(my.widgets.getByEl($(this).closest('.widget')));

        fitGrid();

    }

    function addChartContainers(data) {

            // Closure to maintain each chart data value in loop

            (function(config){

                // Add div wrappers for js grid layout library,

                // and add title, icons, and buttons

                // This is the widget "model"/object used throughout.

                my.widgets.add(config);

            })(data.modules[name]);

        }

        fitGrid();

        for(var guid in my.widgets.all()){

            loadWidgetData(my.widgets.get(guid));

        }

    }

    /**

     * [isPreviewableType Determine if a chart type can be previewed in the 'preview api' section of the modal]

     * @return {Boolean}      [Whether or not it's previewable]

     */

    function isPreviewableType(type) {

        if(type === 'iframe') {return false;}

        if(type === 'youtube') {return false;}

        if(type === 'custom') {return false;}

        return true;

    }

    /**

     * [chartsTypeChanged Event handler for onChange event for chart type field]

     */

        var active_conf = getParsedFormConfig();

        var previewable = isPreviewableType(active_conf.type);

        togglePreviewOutput(previewable);

    }

        // Update the order field based on the current rows item length.

        populateOrderField();

    }

    function loader(container) {

        container.select('.loader-overlay').classed({hidden: false});

        container.select('.widget-loader').classed({hidden: false});

    }

    function unload(container) {

        container.select('.loader-overlay').classed({hidden: true});

        container.select('.widget-loader').classed({hidden: true});

    }

    /**

     * [addDomEvents Add all dom event handlers here]

     */

    function addDomEvents() {

        WIDGET_FORM.find('[name="row"]').on('change.charts.row', chartsRowChanged);

        // Chart type change

        WIDGET_FORM.find('[name="type"]').on('change.charts.type', chartsTypeChanged);

        // TODO: debounce/throttle

        API_PREVIEW_BTN.on('click.charts', previewAPIRoute);

        // Save module popup form

        SAVE_WIDGET_BTN.on('click.charts.save', saveWidget);

        // Edit existing modules

        EDIT_MODAL.on('show.bs.modal', populateEditForm);

        UPDATE_FORM_BTN.on('click.charts.save', onUpdateWidget);

        // Allow swapping of edit/update events

        // for the add module button and form modal

        ADD_MODULE.on('click.charts', function(){

            UPDATE_FORM_BTN

            .attr('id', SAVE_WIDGET_BTN.selector.replace('#', ''))

            .text('Save widget')

            .off('click.charts.save')

            .on('click.charts.save', saveWidget);

        });

        // Allow swapping of edit/update events

        // for the add module per row button and form modal

        VIEW_BUILDER.on('click.charts', '.grid-row-label', function(){

            UPDATE_FORM_BTN

            .attr('id', SAVE_WIDGET_BTN.selector.replace('#', ''))

            .text('Save widget')

            .off('click.charts.save')

            .on('click.charts.save', saveWidget);

        });

        // Add delete button for existing widgets.

        DELETE_BTN.on('click.charts', function(e){

            e.preventDefault();

            var guid = WIDGET_FORM.attr('data-guid');

        });

        // Add delete confirm for dashboards.

        DELETE_DASHBOARD.on('submit.charts', function(e){

        });

    }

        fitGrid({

            columnWidth: 5,

            itemSelector: '.item',

            transitionDuration: 0,

            fitWidth: true

        }, true);

        $('.item.widget').removeClass('hidden');

    }

    function initFixedDragDrop(options) {

        var grid_drag_opts = {

            connectToSortable: '.grid-row'

        };

        $('.grid-row').droppable({

            drop: function(event, ui) {

                // update the widgets location

                var idx    = $(this).index();

                var el     = $(ui.draggable);

                var widget = my.widgets.getByEl(el);

                widget.update({row: idx}, true);

                // Actually move the dom element, and reset

                // the dragging css so it snaps into the row container

                el.parent().appendTo($(this));

                el.css({

                    position: 'relative',

                    top: 0,

                    left: 0

                });

            }

        });

        $('.item.widget').draggable($.extend(grid_drag_opts, options));

    }

    function fitGrid(grid_packer_opts, init) {

        var valid_options = $.isPlainObject(grid_packer_opts);

        var grid_packer_options = $.extend({}, valid_options ? grid_packer_opts : {}, {});

        var drag_options = {

            scroll: true,

            handle: '.dragger',

            start: function() {

                $('.grid-row').addClass('drag-target');

            },

            stop: function(){

                $('.grid-row').removeClass('drag-target');

                EDIT_CONTAINER.collapse('show');

                if(my.layout === 'grid') {

                    // Update row order.

                    updateChartsRowOrder();

                } else {

                    my.chart_wall.packery(grid_packer_options);

                    updateChartsOrder();

                }

            }

        };

        if(my.layout === 'grid' && $('.grid-row').length > 1) {

            initFixedDragDrop(drag_options);

            return;

        }

        if(init) {

            my.chart_wall = $('#container').packery(grid_packer_options);

            my.chart_wall.packery('bindUIDraggableEvents', items);

        } else {

            my.chart_wall.packery(grid_packer_options);

        }

    }

    function updateChartsOrder() {

        // Update the order and order value of each chart

        var items = my.chart_wall.packery('getItemElements');

        // Update module order

            var widget = my.widgets.getByEl($(this));

            widget.update({order: i}, true);

        });

    }

    function handleInputs(widget, config) {

        var inputs_selector = '[data-guid="' + config.guid + '"] .chart-inputs';

        // Load event handlers for these newly created forms.

        $(inputs_selector).find('form').on('submit', function(e){

            e.stopImmediatePropagation();

            e.preventDefault();

            // Just create a new url for this, but use existing config.

            // The global object config will not be altered.

            // The first {} here is important, as it enforces a deep copy,

            // not a mutation of the original object.

            var url = config.dataSource;

            // Ensure we don't lose params already save on this endpoint url.

            var existing_params = url.split('?')[1];

            var params = jsondash.util.getValidParamString($(this).serializeArray());

                dataSource: url.replace(/\?.+/, '') + '?' + existing_params + '&' + params

            });

            // Otherwise reload like normal.

            loadWidgetData(my.widgets.get(config.guid));

            // Hide the form again

            $(inputs_selector).removeClass('in');

        });

    }

    /**

     * [loadWidgetData Load a widgets data source/re-render]

     */

    function loadWidgetData(widg) {

        var widget = widg.el;

        var config = widg.config;

        widget.classed({error: false});

        widget.select('.error-overlay')

            .classed({hidden: true})

            .select('.alert')

            .text('');

        loader(widget);

        try {

            // Handle any custom inputs the user specified for this module.

            // They map to standard form inputs and correspond to query

            // arguments for this dataSource.

            if(config.inputs) {handleInputs(widg, config);}

            if(config.type === 'datatable') {

                jsondash.handlers.handleDataTable(widget, config);

            }

            else if(jsondash.util.isSparkline(config.type)) {

                jsondash.handlers.handleSparkline(widget, config);

            }

            else if(config.type === 'iframe') {

                jsondash.handlers.handleIframe(widget, config);

            }

            else if(config.type === 'timeline') {

                jsondash.handlers.handleTimeline(widget, config);

            }

            else if(config.type === 'venn') {

                jsondash.handlers.handleVenn(widget, config);

            }

            else if(config.type === 'number') {

                jsondash.handlers.handleSingleNum(widget, config);

            }

            else if(config.type === 'youtube') {

                jsondash.handlers.handleYoutube(widget, config);

            }

            else if(config.type === 'graph'){

                jsondash.handlers.handleGraph(widget, config);

            }

            else if(config.type === 'custom') {

                jsondash.handlers.handleCustom(widget, config);

            }

            else if(config.type === 'wordcloud') {

                jsondash.handlers.handleWordCloud(widget, config);

            }

            else if(config.type === 'plotly-any') {

                jsondash.handlers.handlePlotly(widget, config);

            }

            else if(jsondash.util.isD3Subtype(config)) {

                jsondash.handlers.handleD3(widget, config);

            } else {

                jsondash.handlers.handleC3(widget, config);

            }

        } catch(e) {

            widget.classed({error: true});

            widget.select('.error-overlay')

                .classed({hidden: false})

                .select('.alert')

                .text('Loading error: "' + e + '"');

            unload(widget);

        }

        addResizeEvent(widg);

    }

    function prettyCode(code) {

        return JSON.stringify(JSON.parse(code), null, 4);

    }

    function prettifyJSONPreview() {

        // Reformat the code inside of the raw json field,

        // to pretty print for the user.

        JSON_DATA.text(prettyCode(JSON_DATA.text()));

    }

    function setupResponsiveEvents() {

        // This is handled by bs3, so we don't need it.

        if(my.layout === 'grid') {return;}

        // Setup responsive handlers

        var jres = jRespond([

        {

            label: 'handheld',

            enter: 0,

            exit: 767

        }

        ]);

        jres.addFunc({

            breakpoint: 'handheld',

            enter: function() {

                $('.widget').css({

                    'max-width': '100%',

                    'width': '100%',

                    'position': 'static'

                });

            }

        });

    }

    function addNewRow(e) {

        // Add a new row with a toggleable label that indicates

        // which row it is for user editing.

        var placement = 'top';

        if(e) {

            e.preventDefault();

            placement = $(this).closest('.row').data().rowPlacement;

        }

        var el = ROW_TEMPLATE.clone(true);

        el.removeClass('grid-row-template');

        if(placement === 'top') {

            VIEW_BUILDER.find('.add-new-row-container:first').after(el);

        } else {

            VIEW_BUILDER.find('.add-new-row-container:last').before(el);

        }

        // Update the row ordering text

        updateRowOrder();

        // Add new events for dragging/dropping

        fitGrid();

    }

    function updateChartsRowOrder() {

        // Update the row order for each chart.

        // This is necessary for cases like adding a new row,

        // where the order is updated (before or after) the current row.

        // NOTE: This function assumes the row order has been recalculated in advance!

        $('.grid-row').each(function(i, row){

            $(row).find('.item.widget').each(function(j, item){

                var widget = my.widgets.getByEl($(item));

                widget.update({row: i + 1, order: j + 1}, true);

            });

        });

    }

    function updateRowOrder() {

        $('.grid-row').not('.grid-row-template').each(function(i, row){

            var idx = $(row).index();

            $(row).find('.grid-row-label').attr('data-row', idx);

            $(row).find('.rownum').text(idx);

        });

        updateChartsRowOrder();

    }

    function loadDashboard(data) {

        // Load the grid before rendering the ajax, since the DOM

        // is rendered server side.

        initGrid(MAIN_CONTAINER);

        // Add actual ajax data.

        addChartContainers(data);

        my.dashboard_data = data;

        // Format json config display

            var code = $(this).find('code').text();

            $(this).find('code').text(prettyCode(code));

        });

        // Add event for downloading json config raw.

        // Will provide decent support but still not major: http://caniuse.com/#search=download

            var datestr = new Date().toString().replace(/ /gi, '-');

            var data = encodeURIComponent(JSON.stringify(JSON_DATA.val(), null, 4));

            data = "data:text/json;charset=utf-8," + data;

            $(this).attr('href', data);

            $(this).attr('download', 'charts-config-raw-' + datestr + '.json');

        });

        // For fixed grid, add events for making new rows.

        ADD_ROW_CONTS.find('.btn').on('click', addNewRow);

            $('body').toggleClass('jsondash-editing');

            updateRowControls();

        });

        $('.delete-row').on('click', function(e){

            e.preventDefault();

            var row = $(this).closest('.grid-row');

            if(row.find('.item.widget').length > 0) {

                if(!confirm('Are you sure?')) {

                    return;

                }