javascript - Angular : use a variable into

Question

我有一个名为“HomeCtrl”的 Controller ，它计算进入 {{total}} 的用户总数。绑定(bind)变量，像这样:

.controller('HomeCtrl', function($scope, $http){
    $scope.total = 0;
});

在我看来，我试图通过传递 {{total}} 在动画小部件中显示我的总数。作为 <div> 上的属性值标签，像这样:

<div ng-controller="HomeCtrl" ng-init="init('users')">
    <div class="xe-widget xe-counter xe-counter-green" xe-counter 
       data-count=".num" data-from="1" 
       data-to= "{{total}}" 
       data-suffix="users" data-duration="3" data-easing="true">
          <div class="xe-icon">
                  <i class="linecons-user"></i>
          </div>
          <div class="xe-label">
                  <strong class="num">1k</strong>
                  <span>Users Total </span>
          </div>
   </div>            
   <center> <b> Total utilisateurs : {{total}} </b> </center>     

这是小部件指令:

.directive('xeCounter', function(){     
        return {
            restrict: 'EAC',
            link: function(scope, el, attrs)
            {
                var $el = angular.element(el),
                    sm = scrollMonitor.create(el);
                sm.fullyEnterViewport(function()
                {
                    var opts = {
                        useEasing:      attrDefault($el, 'easing', true),
                        useGrouping:    attrDefault($el, 'grouping', true),
                        separator:      attrDefault($el, 'separator', ','),
                        decimal:        attrDefault($el, 'decimal', '.'),
                        prefix:         attrDefault($el, 'prefix', ''),
                        suffix:         attrDefault($el, 'suffix', ''),
                    },
                    $count      = attrDefault($el, 'count', 'this') == 'this' ? $el : $el.find($el.data('count')),
                    from        = attrDefault($el, 'from', 0),
                    to          = attrDefault($el, 'to', ''),
                    duration    = attrDefault($el, 'duration', 2.5),
                    delay       = attrDefault($el, 'delay', 0),
                    decimals    = new String(to).match(/\.([0-9]+)/) ? new String(to).match(/\.([0-9]+)$/)[1].length : 0,
                    counter     = new countUp($count.get(0), from, to, decimals, duration, opts);                   
                    setTimeout(function(){ counter.start(); }, delay * 1000);

                    sm.destroy();
                });
            }
        };
    })

我可以在我的 View 中显示 {{total}} 的正确值，但是当我通过 {{total}} 时进入属性，如data-to= "{{total}}" ， 这是行不通的。它无法将其识别为数字。

Answer 1

这对我有用:当 Controller 加载时，使用异步 web 服务调用检索 Number。这意味着调用 sm.fullyEnteredViewport 函数时该值不存在。但幸运的是，您可以在 xe-counter 元素上设置数据延迟属性。

<div class="xe-widget xe-counter" xe-counter data-delay="1" data-count=".num" data-from="0" data-to="{{ total }}" data-suffix="" data-duration="5">
<div class="xe-icon"><i class="linecons-cup" /></div>
<div class="xe-label"><strong class="num">0</strong><span>TOTAL</span></div>
</div>

然后像这样修改你的指令:从元素中检索延迟值并将其他代码的其余部分放入延迟函数中，如下所示:

directive('xeCounter', function () {
    return {
        restrict: 'EAC',
        link: function (scope, el, attrs) {

            var $el = angular.element(el),
                sm = scrollMonitor.create(el);
          
                //get the delay attribute from element
                var delay = attrs.delay ? attrs.delay : 0;

            sm.fullyEnterViewport(function () {

                setTimeout(function () {
                    // get all values from element delayed and start the counter
                    var opts = {
                        useEasing: attrDefault($el, 'easing', true),
                        useGrouping: attrDefault($el, 'grouping', true),
                        separator: attrDefault($el, 'separator', ','),
                        decimal: attrDefault($el, 'decimal', '.'),
                        prefix: attrDefault($el, 'prefix', ''),
                        suffix: attrDefault($el, 'suffix', '')
                    },
                    $count = attrDefault($el, 'count', 'this') == 'this' ? $el : $el.find($el.data('count')),
                    from = attrs.from ? attrs.from : 0,
                    to = attrs.to ? attrs.to : 100,
                    duration = attrs.duration ? attrs.duration : 2.5,
                    decimals = String(to).match(/\.([0-9]+)/) ? String(to).match(/\.([0-9]+)$/)[1].length : 0,
                    counter = new countUp($count.get(0), from, to, decimals, duration, opts);
                    counter.start();
                }, delay * 1000);

                sm.destroy();
            });
        }
    };
}).

您的网络服务应在延迟时间内返回。这对我有用。