AngularJS输入模型不更新

Question

我正在尝试使用隔离范围创建一个简单的分页指令.出于某种原因,当我手动更改值时,它有点笨拙.这是我的问题:

当我向前和向后翻页时,效果很好.真棒

当我进入该字段的页面时,它的工作原理.大

但是,如果我进入一个页面到现场,然后尝试去向前和向后的NG-模型似乎打破我进入一个页面到后场.当我没有孤立我的范围时,我有它工作,但我很困惑为什么它会打破它.这是我的代码:

HTML:

<paginate go-to-page="goToPage(page)" total-pages="results.hits.pages" total-hits="results.hits.total"></paginate>

指示:

'use strict';

angular.module('facet.directives')
    .directive('paginate', function(){
        return {
            restrict: 'E',
            template: '<div class="pull-right" ng-if="(totalPages !== undefined) && (totalPages > 0)">'+
                '<span class="left-caret hoverable" ng-click="changePage(current-1)" ng-show="current > 1"></span>&nbsp;&nbsp;Page'+
                '&nbsp;&nbsp;&nbsp;<input type="number" ng-model="current" class="pagination-input" ng-keypress="enterPage($event)"/> of'+
                '&nbsp;&nbsp;&nbsp;{{totalPages}}&nbsp;&nbsp;'+
                '<span class="right-caret hoverable" ng-click="changePage(current+1)" ng-show="current < totalPages"></span>'+
            '</div>',
            scope: {
                goToPage: '&',
                totalPages: '=',
                totalHits: '='
            },
            link: function(scope) {
                scope.current = 1;
                scope.changePage = function(page) {
                    scope.current = page;
                    window.scrollTo(0,0);
                    scope.goToPage({page:page});
                };
                scope.enterPage = function(event) {
                    if(event.keyCode == 13) {
                        scope.changePage(scope.current);
                    }
                }
            }
        }
    });

我究竟做错了什么？

Answer 1

注意ng-if- 它创建了一个新的范围.如果你把它改成ng-show,你的例子就可以了.如果确实要使用ng-if,请创建一个对象来存储范围变量current.也许是这样的scope.state.current？

scope.state = {
    current: 1
};

为了避免像这样的混淆,我始终保持我的绑定,something.something而不仅仅是something.

编辑:这里有很好的解释 - http://egghead.io/lessons/angularjs-the-dot

Answer 2

由于javascript的原型层次结构,请在使用ng-model时始终尝试使用模型而不是使用原始类型.

angular.module('facet.directives').directive('paginate', function () {
    return {
        restrict: 'E',
        replace: true,
        template: '<div class="pull-right discovery-pagination" ng-if="(totalPages !== undefined) && (totalPages > 0)">' +
            '<span class="left-caret hoverable" ng-click="changePage(current-1)" ng-show="current > 1"></span>&nbsp;&nbsp;Page' +
            '&nbsp;&nbsp;&nbsp;<input type="number" ng-model="current.paging" class="pagination-input" ng-keypress="enterPage($event)"/> of' +
            '&nbsp;&nbsp;&nbsp;{{totalPages}}&nbsp;&nbsp;' +
            '<span class="right-caret hoverable" ng-click="changePage(current+1)" ng-show="current < totalPages"></span>' +
            '</div>',
        scope: {
            goToPage: '&',
            totalPages: '=',
            totalHits: '='
        },
        link: function(scope) {
            scope.current = {paging:1};
            scope.changePage = function(page) {
                scope.current.paging = page;
                window.scrollTo(0, 0);
                scope.goToPage({ page: page });
            };
            scope.enterPage = function(event) {
                if (event.keyCode == 13) {
                    scope.changePage(scope.current.paging);
                }
            };
        }
    };
}); 

希望这会解决你的问题:)

有关详细信息,请参阅Understanding-Scopes