Obtaining a reference to a filtered result in ngRepeat with AngularJS

Question

Obtaining a reference to a filtered result in ngRepeat with AngularJS

Using an ng-repeat directive with a filter, the code looks like this:

ng-repeat="item in items | orderBy:'order_prop' | filter:query | limitTo:4"

The rendered results are visible; now the goal is to perform some logic on that result in the controller. How can the reference to the result items be obtained?

Update:

In order to create an auto-complete feature, there is an input field:

<input id="queryInput" ng-model="query" type="text" size="30" placeholder="Enter query">

Followed by the filtered results:

<ul>
   <li  ng-repeat="item in items | orderBy:'order_prop' | filter:query | limitTo:4">{{item.name}}</li>
</ul>

The aim now is to navigate through the results and select one of the items.

javascript angularjs filter angularjs-ng-repeat

Answer 1

Answer №1

UPDATE: An improved solution is now available.

 <input ng-model="searchTerm">
 <div ng-repeat="item in (filteredItems = (items | orderBy:'property' | filter:searchTerm | limitTo:4))">
   {{item}}
 </div>

Now you can easily access $scope.filteredItems.

Answer 2

UPDATE: An improved solution is now available.

 <input ng-model="searchTerm">
 <div ng-repeat="item in (filteredItems = (items | orderBy:'property' | filter:searchTerm | limitTo:4))">
   {{item}}
 </div>

Now you can easily access $scope.filteredItems.

Answer 3

Answer №2

Andy Joslin's solution has been transformed into a filter version for your convenience.

Note: IMPORTANT UPDATE. Starting from version 1.3.0-beta.19 (this commit), filters no longer have a context and this is now bound to the global scope. You can either pass the context as an argument or utilize the new aliasing syntax in ngRepeat, version 1.3.0-beta.17+.

// prior to 1.3.0-beta.19
yourModule.filter("as", function($parse) {
  return function(value, path) {
    return $parse(path).assign(this, value);
  };
});

// 1.3.0-beta.19+
yourModule.filter("as", function($parse) {
  return function(value, context, path) {
    return $parse(path).assign(context, value);
  };
});

Next, implement this in your view

<!-- prior to 1.3.0-beta.19 -->
<input ng-model="query">
<div ng-repeat="item in items | orderBy:'order_prop' | filter:query | limitTo:4 | as:'filteredItems'">
 {{item}}
</div>

<!-- 1.3.0-beta.19+ -->
<input ng-model="query">
<div ng-repeat="item in items | orderBy:'order_prop' | filter:query | limitTo:4 | as:this:'filteredItems'">
 {{item}}
</div>

<!-- 1.3.0-beta.17+ ngRepeat aliasing -->
<input ng-model="query">
<div ng-repeat="item in items | orderBy:'order_prop' | filter:query | limitTo:4 as filteredItems">
 {{item}}
</div>

This setup grants you access to $scope.filteredItems.

Answer 4

Andy Joslin's solution has been transformed into a filter version for your convenience.

Note: IMPORTANT UPDATE. Starting from version 1.3.0-beta.19 (this commit), filters no longer have a context and this is now bound to the global scope. You can either pass the context as an argument or utilize the new aliasing syntax in ngRepeat, version 1.3.0-beta.17+.

// prior to 1.3.0-beta.19
yourModule.filter("as", function($parse) {
  return function(value, path) {
    return $parse(path).assign(this, value);
  };
});

// 1.3.0-beta.19+
yourModule.filter("as", function($parse) {
  return function(value, context, path) {
    return $parse(path).assign(context, value);
  };
});

Next, implement this in your view

<!-- prior to 1.3.0-beta.19 -->
<input ng-model="query">
<div ng-repeat="item in items | orderBy:'order_prop' | filter:query | limitTo:4 | as:'filteredItems'">
 {{item}}
</div>

<!-- 1.3.0-beta.19+ -->
<input ng-model="query">
<div ng-repeat="item in items | orderBy:'order_prop' | filter:query | limitTo:4 | as:this:'filteredItems'">
 {{item}}
</div>

<!-- 1.3.0-beta.17+ ngRepeat aliasing -->
<input ng-model="query">
<div ng-repeat="item in items | orderBy:'order_prop' | filter:query | limitTo:4 as filteredItems">
 {{item}}
</div>

This setup grants you access to $scope.filteredItems.

Answer 5

Answer №3

Consider attempting a different approach, as the issue with the ng-repeat lies in its creation of a child scope that restricts access to

filteritems

within the controller

<li ng-repeat="doc in $parent.filteritems = (docs | filter:searchitems)" ></li>

Answer 6

Consider attempting a different approach, as the issue with the ng-repeat lies in its creation of a child scope that restricts access to

filteritems

within the controller

<li ng-repeat="doc in $parent.filteritems = (docs | filter:searchitems)" ></li>

Answer 7

Answer №4

Updated Info:

Even with version 1.3.0, using the as syntax does not allow you to place it within the scope of the controller or parent element. For instance, consider the code snippet below:

<div>{{labelResults}}</div>
<li ng-repeat="label in (labels | filter:query | as labelResults)">
</div>

The code above will not function as intended. To work around this issue, you can utilize $parent like this:

<li ng-repeat="label in ($parent.labelResults = (labels | filter:query))">

Answer 8

Updated Info:

Even with version 1.3.0, using the as syntax does not allow you to place it within the scope of the controller or parent element. For instance, consider the code snippet below:

<div>{{labelResults}}</div>
<li ng-repeat="label in (labels | filter:query | as labelResults)">
</div>

The code above will not function as intended. To work around this issue, you can utilize $parent like this:

<li ng-repeat="label in ($parent.labelResults = (labels | filter:query))">

Answer 9

Answer №5

I have devised a improved version of Andy's solution. Instead of using ng-repeat to place a watch on the expression containing the assignment, I suggest placing a watch in the controller on a function that handles the assignment. This way, all assignments are kept in one centralized location.

One drawback of Andy's approach is the potential for assignment issues when dealing with child scopes. It's similar to the reasons why it's recommended to use a dot in ng-model.

Another downside to Andy's solution is that it hides the definition of the filtered array within the view markup. This can become confusing if the filtered array is used in multiple places within the view or controller.

The simpler solution I propose involves using a $watch function in the controller:

$scope.$watch(function () {
    $scope.filteredItems = $scope.$eval("items | orderBy:'order_prop' | filter:query | limitTo:4");
});

This function will be evaluated during each digest cycle, maintaining performance comparable to Andy's solution. Additionally, you can add multiple assignments within the function to keep them organized in one place.

In the view, you can then directly utilize the filtered list:

<ul>
    <li  ng-repeat="item in filteredItems">{{item.name}}</li>
</ul>

Here's a fiddle showcasing this approach in a more complex scenario.

Answer 10

I have devised a improved version of Andy's solution. Instead of using ng-repeat to place a watch on the expression containing the assignment, I suggest placing a watch in the controller on a function that handles the assignment. This way, all assignments are kept in one centralized location.

One drawback of Andy's approach is the potential for assignment issues when dealing with child scopes. It's similar to the reasons why it's recommended to use a dot in ng-model.

Another downside to Andy's solution is that it hides the definition of the filtered array within the view markup. This can become confusing if the filtered array is used in multiple places within the view or controller.

The simpler solution I propose involves using a $watch function in the controller:

$scope.$watch(function () {
    $scope.filteredItems = $scope.$eval("items | orderBy:'order_prop' | filter:query | limitTo:4");
});

This function will be evaluated during each digest cycle, maintaining performance comparable to Andy's solution. Additionally, you can add multiple assignments within the function to keep them organized in one place.

In the view, you can then directly utilize the filtered list:

<ul>
    <li  ng-repeat="item in filteredItems">{{item.name}}</li>
</ul>

Here's a fiddle showcasing this approach in a more complex scenario.

Answer 11

Answer №6

Take a look at this response:

Selecting and accessing items in ng-repeat

<li ng-repeat="item in ..." ng-click="select_item(item)">

Answer 12

Take a look at this response:

Selecting and accessing items in ng-repeat

<li ng-repeat="item in ..." ng-click="select_item(item)">

Obtaining a reference to a filtered result in ngRepeat with AngularJS

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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