gpt4 book ai didi

javascript - Dom 绑定(bind)未在 ionic 内容滚动事件上更新

转载 作者:行者123 更新时间:2023-11-29 21:47:48 24 4
gpt4 key购买 nike

我想在用户向下滚动时做一个进度条。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;
}

我试过两件事:

ng-style='{"width": pos.x}'

ng-style='getXObj()'

但没有绑定(bind)在我向下滚动时提供扩展的红色条。

我读过这个问题:

Angular.js ng-style won't bind value

虽然控制台显示正确的百分比值,但我想不通为什么。

知道为什么这行不通吗?

最佳答案

似乎是一个可能的 ionic 错误。它似乎可以在元素的滚动事件上正确调用该函数,但不会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,作为一种可能的解决方法,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);
}

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/

24 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com