Wijmo 5 - Context Menu Directive

HTML

<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<script src="http://cdn.wijmo.com/5.20143.39/controls/wijmo.min.js"></script>
<link rel="stylesheet" href="http://cdn.wijmo.com/5.20143.39/styles/wijmo.min.css">
<script src="http://cdn.wijmo.com/5.20143.39/controls/wijmo.input.min.js"></script>
<script src="http://cdn.wijmo.com/5.20143.39/interop/angular/wijmo.angular.min.js"></script>
<div ng-app="app" ng-controller="appCtrl">
    
<h3>Wijmo Context Menu Directive</h3>

    <!-- the menu -->
    <wj-menu id="ctxMenu" ng-show="false">
        <wj-menu-item cmd="cmdOpen" cmd-param="1">Open...</wj-menu-item>
        <wj-menu-item cmd="cmdSave" cmd-param="2">Save</wj-menu-item>
        <wj-menu-item cmd="cmdSave" cmd-param="3">Save As...</wj-menu-item>
        <wj-menu-item cmd="cmdNew" cmd-param="4">New...</wj-menu-item>
        <wj-menu-separator></wj-menu-separator>
        <wj-menu-item cmd="cmdExit" cmd-param="5">Exit</wj-menu-item>
    </wj-menu>
    
    <!-- attach context menu to elements -->
    <p>
        The elements below have context menus.
        Right-click any of them to see the menus.</p>

    <div  ctx-menu="ctxMenu" class="box">
        I have a context menu!
    </div>

    <p></p>

    <div ctx-menu="ctxMenu" class="box" style="margin-left:40px">
        me too!
    </div>

    <p></p>

    <div ctx-menu="ctxMenu" class="box" style="float:right;margin-top:200px">
        and I have a context menu.
    </div>
</div>

CSS

.box {
    display: inline-block;
    background-color: yellow;
    padding: 12px;
    border: 1px solid black;
}

JavaScript

// define app, include Wijmo 5 directives
var app = angular.module('app', ['wj']);

// controller
app.controller('appCtrl', function ($scope) {

    // controller defines menu commands:
    $scope.cmdOpen = function (parm) {
        alert('open' + parm);
    }
    $scope.cmdSave = function (parm) {
        alert('save' + parm);
    }
    $scope.cmdNew = function (parm) {
        alert('new' + parm);
    }
    $scope.cmdExit = function (parm) {
        alert('exit' + parm);
    }
});

// context menu directive
app.directive('ctxMenu', function () {

    return {
        restrict: 'A',
        link: function (scope, element, attrs) {

            // get context menu and drop-down list
            var host = document.getElementById(attrs.ctxMenu),
                menu = wijmo.Control.getControl(host),
                dropDown = host.querySelector('[wj-part="dropdown"]');

            // show the drop-down list in response to the contextmenu command
            element[0].addEventListener('contextmenu', function (e) {
                e.preventDefault();
                menu.selectedIndex = -1;
                showPopup(dropDown, e);
                dropDown.focus();
            });
            dropDown.addEventListener('blur', function() {
                setTimeout(function() {
                    dropDown.style.visibility = 'hidden';
                }, 100);
            }, true);
        }
    }

    function showPopup(popup, ref) {

        // make sure popup is a child of the body
        var p = popup.parentElement;
        if (p && p != document.body) {
            p.removeChild(popup);
            p = null;
        }
        if (!p) {
            document.body.appendChild(popup)
        }

        // calculate popup position
        wijmo.setCss(popup, {
            visibility: 'hidden',
            display: ''
        });
        var sz = popup.getBoundingClientRect(),
            left = ref.clientX - sz.width / 2,
            top = ref.clientY - sz.height /...