Auto focus in ng-repeat in angularjs

问题

I uses ng-repeat to get multiple phone numbers

<div ng-repeat="phone in phones">
    <input ng-model="phone" type="text" autofocus="autofocus"> 
</div>
<a ng-click="addPhone()">Add Phone</a>

In controllers

$scope.addPhone = function() {
    $scope.phones.add('');
}

Whenever i add new phone, it automatically autofocus the input. It works great. But when i reload(open from link) the view, it scrolls to last entry. How do i avoid autofocus at first time the view loads. Only i want to autofocus when i add new phone.

回答1:

Try:

<div ng-repeat="phone in phones">
    <input ng-model="phone" type="text" ng-if="$index == focusIndex" autofocus>
    <input ng-model="phone" type="text" ng-if="$index != focusIndex">
  </div>
  <a ng-click="addPhone()">Add Phone</a>

JS:

$scope.addPhone = function() {
    $scope.phones.push('Phone' + Math.random());

    $scope.focusIndex = $scope.phones.length-1;
  }

DEMO

Solution using custom attribute:

<div ng-repeat="phone in phones">
    <input ng-model="phone" type="text" custom-autofocus="$index == focusIndex" >
  </div>
  <a ng-click="addPhone()">Add Phone</a>

JS:

.directive('customAutofocus', function() {
  return{
         restrict: 'A',

         link: function(scope, element, attrs){
           scope.$watch(function(){
             return scope.$eval(attrs.customAutofocus);
             },function (newValue){
               if (newValue === true){
                   element[0].focus();//use focus function instead of autofocus attribute to avoid cross browser problem. And autofocus should only be used to mark an element to be focused when page loads.
               }
           });
         }
     };
})

DEMO

回答2:

You can use this directive: https://github.com/aikus/ng-focus-if/blob/master/ng-focus-if.js For example:

<div ng-repeat="phone in phones">
   <input ng-model="phone" type="text" ng-focus-if="1==1"> 
</div>
<a ng-click="addPhone()">Add Phone</a>

回答3:

What happens is you have a list of inputs that is demanding the focus when the page loads at the same time. Since the last input renders last, it always gets the autofocus.

The solution would be to apply the autofocus attribute when needed.

<div ng-repeat="phone in phones">
    <input ng-model="phone" type="text" autofocus="{{phone.autofocus || 'false'}}"> 
</div>
<a ng-click="addPhone()">Add Phone</a>

Controller:

$scope.addPhone = function() {
    $scope.phones[$scope.phones.length-1].autofocus = 'false'; // unfocus the old
    $scope.phones.add('');
    $scope.phones[$scope.phones.length-1].autofocus = 'true'; // focus the new
}

回答4:

Having autofocus multiple times in your page is not forbidden, but does not look right based on the documentationm, https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Input

It saysOnly one form element in a document can have the autofocus attribute

autofocus HTML5 This Boolean attribute lets you specify that a form control should have input focus when the page loads, unless the user overrides it, for example by typing in a different control. Only one form element in a document can have the autofocus attribute, which is a Boolean. It cannot be applied if the type attribute is set to hidden (that is, you cannot automatically set focus to a hidden control).

I would not to use autofocus within ng-repeat and set focus manually after it is added.

来源：https://stackoverflow.com/questions/21350572/auto-focus-in-ng-repeat-in-angularjs

标签

javascript

angularjs

autofocus