angularjs：检查id是否存在于数组中？

Question

 var vm = this; vm.usableDeposits = []; for (var i = 0; i < billableChargeCodes.length; i++) { var deposits = usableDeposits.filter(function(ud) { return ud.billinggroupuid == billableChargeCodes[i].billinggroupuid || ud.billinggroupuid == billableChargeCodes[i].billingsubgroupuid || ud.departmentuid == billableChargeCodes[i].departmentuid || !ud.entypeuid || ud.entypeuid == entypeuid }) for (var i = 0; i < deposits.length; i++) { var depositid = deposits[i]._id; 

first time, vm.usableDeposits[] is empty. I have to check deposits[i]._id exists in vm.usableDeposits[] or not. How to check vm.usableDeposits[] empty array _id with deposits[i]._id ? if id not exists in vm.usableDeposits[] , then i want to push the element into vm.usableDeposits[]

Answer 1

You can simply use the indexOf operator in JavaScript to check if a value exists in the array or not. It returns -1 if the value is not in the array, else, it returns the index of the element in the array .

The syntax goes like this -

if(myArray.indexOf(value) !== -1) {
    // do this
} else {
    // do that
}

Hope this helps.

Answer 2

You can use .some

deposits.some(o=> vm.usableDeposits.indexOf(o.id))

to check if the ID in deposits array is in vm.usableDeposits . .some will return true if condition is true and false otherwise

Answer 3

$scope.findIndexInData = function(data, property, value) {
    var result = -1;
        if((!!data) && (!!property) && (!!value)){
            data.some(function (item, i) {
                if (item[property] === value) {
                    result = i;
                    return true;
                }
            });
        }
    return result;
  }

Pass on the array as the First Element. Property as second element and value you are looking in that array.

Example:

array = [{id:"1234",name:"abc"}, {id:"4567",name"xyz"}] 

So you need to call:

index = $scope.findIndexInData(array , 'id' , 4567)