How to generates dynamically ng-model=“my_{{$index}}” with ng-repeat in AngularJS?

Question

I would like to ask you if you can give me a hand on this.

I have created a jsfiddle with my problem here. I need to generate dynamically some inputs with ng-model i

Answer 1

I need to generate dynamically some inputs with ng-model in a ng-repeater using the way ng-model="my_{{$index}}".

One can use the this identifier with a bracket notation property accessor:

  <tr ng-repeat="param in parameters">
    <td>{{param}}:</td>
    <td>
      <input type="text" ng-model="this['my_'+$index]" />
      my_{{$index}}
    </td>
  </tr>

It is possible to access the $scope object using the identifier this.

For more information, see

• AngularJS Developer Guide - Expression Context

Answer 2

Beterraba's answer was very helpful for me. However, when I had to migrate the solution to Typescript it wouldn't behave for me. Here is what I did instead. I expanded the individual parameters (fields on the queryList in your example) into full objects that included a "value" field. I then bound to the "value" field and it worked great!

Originally you had:

[
  { name: 'Check Users', fields: [ "Name", "Id"] },
    ...
  }
]

I changed it to something like this:

[
  { name: 'Check Users', fields: [
                                    {Text:"Name",Value:""},
                                    {Text:"Id",Value:0}],
                                    ...
                                   ]
  }
]

...and bound to the 'Value' sub-field.

Here is my Typescript if you care.

In the html:

<div ng-repeat="param in ctrl.sprocparams" >
    <sproc-param param="param" />
</div>

In the sproc-param directive that uses Angular Material. See where I bind the ng-model to param.Value:

return {
    restrict: 'E',
    template: `
                <md-input-container class="md-block" flex-gt-sm>
                    <label>{{param.Name}}</label>
                    <input  name="{{param.Name}}" ng-model=param.Value></input>
                </md-input-container>`,
    scope: {
            param: "="
        }
}

Answer 3

Is there a reason to generate those field names? Can you treat each field as an object with name and value instead of a string name? (FIDDLE)

function MainCtrl($scope) {
     $scope.queryList = [
         { name: 'Check Users', fields: [ { name: "Name" },  { name: "Id" } ] },
         { name: 'Audit Report', fields: [] },
         { name: 'Bounce Back Report', fields: [ { name: "Date" } ] } 
      ];
}

And just repeat off of selectedQuery.fields:

<tr ng-repeat="field in selectedQuery.fields">
    <td>{{field.name}}:</td>
    <td><input type="text" ng-model="field.value" /></td>
</tr>

Answer 4

What you could do is to create an object on a scope (say, values) and bind to the properties of this object like so:

<input type="text" ng-model="values['field_' + $index]" />

Here is a jsFiddle illustrating the complete solution: http://jsfiddle.net/KjsWL/

Answer 5

I did elaborate my answer from pkozlowski's and try to generate a dynamic form, with dynamic ng-model:

<form ng-submit="testDynamic(human)">
    <input type="text" ng-model="human.adult[($index+1)].name">
    <input type="text" ng-model="human.adult[($index+1)].sex">
    <input type="text" ng-model="human.adult[($index+1)].age">
</form>

But first, we need to define the 'human' scope inside our controller

$scope.human= {};

And then, on submission we will have the data like this (depending on how much field is generated):

var name = human.adult[i].name;
var sex = human.adult[i].sex;
var age = human.adult[i].age;

It's pretty straightforward and I hope my answer helps.

Answer 6

Does it solve your problem?

function MainCtrl($scope) {
     $scope.queryList = [
        { name: 'Check Users', fields: [ "Name", "Id"] },
        { name: 'Audit Report', fields: [] },
        { name: 'Bounce Back Report', fields: [ "Date"] } 
      ];
    $scope.models = {};
    $scope.$watch('selectedQuery', function (newVal, oldVal) {
        if ($scope.selectedQuery) {
            $scope.parameters = $scope.selectedQuery.fields;
        }
    });
}

And in your controller:

  <tr ng-repeat="param in parameters">
    <td>{{param}}:</td>
    <td><input type="text" ng-model="models[param] " />field_{{$index}}</td>
  </tr>

Fiddle