我想在用户向下滚动时显示进度条。当它一直向下时，条形宽度为 100%。
http://codepen.io/hawkphil/pen/vOyPwN
HTML ionic 列表指令
<link href="//code.ionicframework.com/nightly/css/ionic.css" rel="stylesheet">
<script src="//code.ionicframework.com/nightly/js/ionic.bundle.js"></script>
</head>
<body ng-controller="MyCtrl">
<ion-header-bar class="bar-positive">
<div class="buttons">
<button class="button button-icon icon ion-ios-minus-outline"
ng-click="data.showDelete = !data.showDelete; data.showReorder = false"></button>
</div>
<h1 class="title">Ionic Delete/Option Buttons</h1>
<div class="buttons">
<button class="button" ng-click="data.showDelete = false; data.showReorder = !data.showReorder">
Reorder
</button>
</div>
<!--div class="progress" ng-style='{"width": pos.x}'></div-->
<div class="progress" ng-style='getXObj()'></div>
</ion-header-bar>
<ion-content on-scroll="isScrolling()">
<!-- The list directive is great, but be sure to also checkout the collection repeat directive when scrolling through large lists -->
<ion-list show-delete="data.showDelete" show-reorder="data.showReorder">
<ion-item ng-repeat="item in items"
item="item"
href="#/item/{{item.id}}" class="item-remove-animate">
Item {{ item.id }}
<ion-delete-button class="ion-minus-circled"
ng-click="onItemDelete(item)">
</ion-delete-button>
<ion-option-button class="button-assertive"
ng-click="edit(item)">
Edit
</ion-option-button>
<ion-option-button class="button-calm"
ng-click="share(item)">
Share
</ion-option-button>
<ion-reorder-button class="ion-navicon" on-reorder="moveItem(item, $fromIndex, $toIndex)"></ion-reorder-button>
</ion-item>
</ion-list>
</ion-content>
</body>
</html>
JS
angular.module('ionicApp', ['ionic'])
.controller('MyCtrl', function($scope, $ionicScrollDelegate) {
$scope.data = {
showDelete: false
};
$scope.edit = function(item) {
alert('Edit Item: ' + item.id);
};
$scope.share = function(item) {
alert('Share Item: ' + item.id);
};
$scope.moveItem = function(item, fromIndex, toIndex) {
$scope.items.splice(fromIndex, 1);
$scope.items.splice(toIndex, 0, item);
};
$scope.onItemDelete = function(item) {
$scope.items.splice($scope.items.indexOf(item), 1);
};
$scope.items = [
{ id: 0 },
{ id: 1 },
{ id: 2 },
{ id: 3 },
{ id: 4 },
{ id: 5 },
{ id: 6 },
{ id: 7 },
{ id: 8 },
{ id: 9 },
{ id: 10 },
{ id: 11 },
{ id: 12 },
{ id: 13 },
{ id: 14 },
{ id: 15 },
{ id: 16 },
{ id: 17 },
{ id: 18 },
{ id: 19 },
{ id: 20 },
{ id: 21 },
{ id: 22 },
{ id: 23 },
{ id: 24 },
{ id: 25 },
{ id: 26 },
{ id: 27 },
{ id: 28 },
{ id: 29 },
{ id: 30 },
{ id: 31 },
{ id: 32 },
{ id: 33 },
{ id: 34 },
{ id: 35 },
{ id: 36 },
{ id: 37 },
{ id: 38 },
{ id: 39 },
{ id: 40 },
{ id: 41 },
{ id: 42 },
{ id: 43 },
{ id: 44 },
{ id: 45 },
{ id: 46 },
{ id: 47 },
{ id: 48 },
{ id: 49 },
{ id: 50 }
];
$scope.pos = {x:'21.41982072480742%', xObj: {}};
$scope.isScrolling = function() {
console.log($ionicScrollDelegate.getScrollPosition());
$scope.pos.x = ($ionicScrollDelegate.getScrollPosition().top / 2204 * 100) + '%';
console.log($scope.pos.x);
//$scope.getXObj();
}
$scope.getXObj = function() {
console.log({"width": $scope.pos.x});
return {"width": $scope.pos.x + "%"};
}
});
CSS
body {
cursor: url('http://ionicframework.com/img/finger.png'), auto;
}
.progress {
height: 2px;
background: red;
}
我尝试了两件事:
ng-style='{"width": pos.x}'
和
ng-style='getXObj()'
但在我向下滚动时没有绑定(bind)提供扩展的红色条。
我已阅读此问题:
Angular.js ng-style won't bind value
我不知道为什么控制台显示了正确的百分比值。
知道为什么这不起作用吗？
最佳答案
似乎是一个可能的 ionic 错误。它似乎在元素的滚动事件上调用了该函数，但没有调用摘要循环来更新 DOM。
来自 ionic 的片段:
var scrollFunc = function(e) {
var detail = (e.originalEvent || e).detail || {};
$scope.$onScroll && $scope.$onScroll({ //<-- Here it gets called but it is outside of angular context
event: e,
scrollTop: detail.scrollTop || 0,
scrollLeft: detail.scrollLeft || 0
});
};
$element.on('scroll', scrollFunc); //event registration
因此，作为可能的解决方案，您可以执行 scope.$evalAsync这可能是更安全的选择。
$scope.isScrolling = function() {
$scope.pos.x = ($ionicScrollDelegate.getScrollPosition().top / 2204 * 100) + '%';
$scope.$evalAsync(angular.noop);
}
<强> Demo
关于javascript - Dom 绑定(bind)未在 ionic 内容滚动事件上更新，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30493021/