AngularJS filter already selected option from dynamic field - angularjs

Question

I have a form where you can add x number of fields. Each field contains option select. I want to filter out the already chosen option when this option is already chosen in one or multiples field before. Each field has a remove button and the form has 1 add button.
How can I filter out the dynamic fields?
Any help,guidance is most welcome.Thanks in advance. :)
This is how my HTML looks like:
<div data-ng-repeat="choice in choices">
<select data-ng-model="choice.option"
data-ng-options="item as item.Value for item in options">
</select>
<button data-ng-click="removeChoice(choice)">Remove choice</button>
<div>
<button data-ng-show="choices.length <= 4" data-ng-click="addNewChoice()">Add Choice</button>
</div>
</div>
And my controller:
$scope.options = [
{
"Key": "0",
"Value": "Select an option"
},
{
"Key": "Option1",
"Value": "Option1"
},
{
"Key": "Option2",
"Value": "Option2"
},
{
"Key": "Option3",
"Value": "Option3"
},
{
"Key": "Option4",
"Value": "Option4"
},
{
"Key": "Option5",
"Value": "Option5"
}
];
$scope.choices = [{ id: '1' }];
$scope.addNewChoice = function () {
var newItemNo = $scope.choices.length + 1;
$scope.choices.push({ id: newItemNo, option: $scope.option, value: $scope.value });
};
$scope.removeChoice = function () {
var index = $scope.choices.indexOf(choice);
$scope.choices.splice(index, 1);
};

Answer 1

ok
i can give simple recommendation which will be this.
1: add variable $scope.selectedOptions = [];
this will contain list of already selected options from all select elements .
2: create function $scope.AddSelectedOption(item);
this will add the selected object when we change option from any select element because we are going to use for all selects ng-change= "AddSelectedOption(item);"
3: add checkIfSelected(item); this will check if given object value is already selected or not ..
will user in
hope you understand what it will do just check like this
$scope.checkIfSelected = function (item) {
$scope.selectedFound = $scope.selectedOptions.filter(function
(option) {
if(option.value == item.value)
{
return day;
}
});
if($scope.selectedFound.length == 0 ) { return false; } else {
return true; }
}
This will return true if give item found in the options.
if not out.. you can invite me to help again .

Answer 2

This is possible. I'm explaining a basic version of this requirement. See the working example here http://plnkr.co/edit/S9yZpjhY55lXsuifnUAc?p=preview
What wer are doing is maintaining another options which is the copy of the original options. Copying the options will make it to not reference existing options since objects are pass by reference in Javascript.
The main logic is in this function, which modify the options on selection:
$scope.optionSelected = function(choice) {
$scope.availableOptions = $scope.availableOptions || angular.copy($scope.options);
if (choice.option) {
var index = -1;
// See if available options has that key
angular.forEach($scope.availableOptions, function(item, i) {
if (item.Key === choice.option.Key) {
index = i;
}
});
if (index > -1) {
// And then remove it
$scope.availableOptions.splice(index, 1);
}
}
};