指令中的AngularJS ng-class用法

时间:2014-05-19 13:43:21

标签: angularjs angularjs-directive

我有一个指令,在其模板中使用ng-class。当我尝试将ng-class添加到父'useage'元素时,它会爆炸说:

Error: [$parse:syntax] Syntax Error: Token '{' is an unexpected token at column 48 of the expression [{ 'active': $stateParams.recordId === row.id } 
{ 'ng-table-selected': selectedRow && selectedRow.id === row.id }] starting at [{ 'ng-table-selected': selectedRow && selectedRow.id === row.id }].
http://errors.angularjs.org/1.2.14/$parse/syntax?

处理这样的事情的正确方法是什么?

父用法html:

<div ng-table-row ng-repeat="row in results"
         ng-class="{ 'active': $stateParams.recordId === row.id }"
         row-click="rowClick(row)"></div>

指令html:

<div class="ng-table-table-row"
 ng-click="rowClicked(row, $event)"
 ng-class="{ 'ng-table-selected': selectedRow && selectedRow.id === row.id }"
 ng-style="{ height: tableOptions.rowHeight, top: rowTop, width: rowWidth }"
 ng-transclude></div>

指令JS:

module.directive('ngTableRow', function ($rootScope) {
    return {
        restrict: 'AE',
        replace: true,
        transclude: true,
        templateUrl: 'common/components/table/views/row.tpl.html',
        link: function ($scope, $element, $attributes) {
            $scope.rowTop = $scope.$index * $scope.tableOptions.rowHeight;

            $scope.rowClicked = function(row){
                // body listener to set active
                $scope.bodyRowClicked(row);

                // row click public api
                $scope.rowClick({
                    row: row
                });
            };
        } 
    };
});

1 个答案:

答案 0 :(得分:1)

我认为原因是在占位符和ng-class指令的模板中都指定了replace: true。 Angular会将<div ng-table-row>替换为指令的模板,并将ng-class中的<div ng-table-row>应用于模板的根元素,该元素也具有ng-class指令。这些可能会混淆并导致问题。

在您的情况下,解决方案可能就像在link()中手动应用CSS类一样简单:

scope.$watch(
    function() {
        return scope.selectedRow && scope.selectedRow.id === scope.row.id;
    },
    function(newval) {
        elem.toggleClass("ng-table-selected", newval);
    }
);

(当然假设selectedRowrow位于scope