javascript - 按首字母从数组中查找和删除元素

Question

我有一个动态数组。值来自方法推送的函数，我希望能够检查数组是否已经包含具有相同字母的元素“X”，所以我想删除该元素然后推送新元素。我怎样才能做到这一点？ 这是 plunker 用我的代码

代码

    $scope.selectedCat = [];
        $scope.selectedCl = [];

        $scope.updateCategory = function (categoryId) {

            if ($scope.selectedCat.indexOf(categoryId) > -1) {
                $scope.selectedCat.splice($scope.selectedCat.indexOf(categoryId), 1);
            } else {
                $scope.selectedCat.push(categoryId);
            }

           $scope.queryCategory = 'categoryId=in=(' + $scope.selectedCat + ")"
          // console.log($scope.queryCategory)
            //Optional, to reload on change.
          $scope.requestSelected ($scope.queryCategory)

        };

        $scope.updateClass = function (classId) {

            if ($scope.selectedCl.indexOf(classId) > -1) {
                $scope.selectedCl.splice($scope.selectedCl.indexOf(classId), 1);
            } else {
                $scope.selectedCl.push(classId);
            }

             $scope.queryClass = 'eventClassId=in=(' + $scope.selectedCl + ")"
            // console.log($scope.queryClass)
            //Optional, to reload on change.
            $scope.requestSelected ($scope.queryClass)

        };


        $scope.filter = []
        var string;
        $scope.requestSelected = function (param){

       if($scope.filter already has an elem with the same letters as param){

         // delete this elem then 

         $scope.filter.push(param)
      } else {

         $scope.filter.push(param)

    }

          // final result 
          string = $scope.filter.join(";")

          console.log(string)

        }

已更新 在@Anton 的帮助下，我终于完成了创建正确请求的逻辑。这是工作 plunker .也许对某人有用

Answer 1

您总是在此处添加条件 $scope.filter.push(param)，而不是您必须为每个搜索字段分隔不同的字段并执行如下操作:

           var filterOptions = {
               filterBy: '&$filter=',
               filterParam: "",
               classId: '',
               categoryId: ''
           };

           $scope.selectedCat = [];
           $scope.selectedCl = [];

           $scope.updateCategory = function (categoryId) {

               if ($scope.selectedCat.indexOf(categoryId) > -1) {
                   $scope.selectedCat.splice($scope.selectedCat.indexOf(categoryId), 1);
               } else {
                   $scope.selectedCat.push(categoryId);
               }

             filterOptions.categoryId = 'categoryId=in=(' + $scope.selectedCat + ")"

             filterOptions.filterParam = filterOptions.classId + ";" + filterOptions.categoryId
           console.log(filterOptions.filterParam)
           };

           $scope.updateClass = function (classId) {

               if ($scope.selectedCl.indexOf(classId) > -1) {
                   $scope.selectedCl.splice($scope.selectedCl.indexOf(classId), 1);
               } else {
                   $scope.selectedCl.push(classId);
               }

               filterOptions.classId = 'eventClassId=in=(' + $scope.selectedCl + ")"

               filterOptions.filterParam = filterOptions.classId + ";" + filterOptions.categoryId
               console.log(filterOptions.filterParam)

           };