redash/rd_ui/app/views/new_widget_form.html

<div class="modal fade" id="add_query_dialog">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal" ng-disabled="saveInProgress" aria-hidden="true">&times;</button>
                <h4 class="modal-title">Add Widget</h4>
            </div>
            <div class="modal-body">
                <p class="btn-group">
                    <button type="button" class="btn btn-default" ng-class="{active: isVisualization()}" ng-click="setType('visualization')">Visualization</button>
                    <button type="button" class="btn btn-default" ng-class="{active: isTextBox()}" ng-click="setType('textbox')">Text Box</button>
                </p>

                <div ng-show="isTextBox()">
                    <div class="form-group">
                        <textarea class="form-control" ng-model="text" rows="3"></textarea>
                    </div>
                    <div ng-show="text">
                        <strong>Preview:</strong>
                        <p ng-bind-html="text | markdown"></p>
                    </div>
                </div>

                <div ng-show="isVisualization()">
                    <p>
                        <form class="form-inline" role="form" ng-submit="loadVisualizations()">
                            <div class="form-group">
                                <input class="form-control" placeholder="Query Id" ng-model="queryId">
                            </div>
                            <button type="submit" class="btn btn-primary" ng-disabled="!queryId">
                                Load visualizations
                            </button>
                        </form>
                    </p>

                    <div ng-show="query">
                      <div class="form-group">
                          <label for="">Choose Visualation</label>
                          <select ng-model="selectedVis" ng-options="vis as vis.name group by vis.type for vis in query.visualizations" class="form-control"></select>
                      </div>
                    </div>
                </div>

                <div class="form-group">
                    <label for="">Widget Size</label>
                    <select class="form-control" ng-model="widgetSize"
                            ng-options="c.value as c.name for c in widgetSizes"></select>
                </div>
            </div>

            <div class="modal-footer">
                <button type="button" class="btn btn-default" ng-disabled="saveInProgress" data-dismiss="modal">Close</button>
                <button type="button" class="btn btn-primary" ng-disabled="saveInProgress || !(selectedVis || isTextBox())" ng-click="saveWidget()">Add to Dashboard</button>
            </div>
        </div>
        <!-- /.modal-content -->
    </div>
    <!-- /.modal-dialog -->
</div>