Trigger ng-click after ng-model updates

Question

Trigger ng-click after ng-model updates

Is there a way to create an ng-click function that will only execute after the value of the ng-model in a scope variable changes? In my scenario, I have a list of analysis objects within a list called analyses, each with an include boolean attribute used for toggling inclusion/exclusion. These objects are displayed as button checkboxes in HTML.

This is the HTML code snippet:

Number of bisulfite sequences: {{included}} used / {{excluded}} excluded
<div ng-repeat="analysis in analyses"><br><label class="btn btn-success" 
ng-model="analysis.include" ng-click="set(analysis.include)" btn-checkbox>

Here's the corresponding controller code:

$scope.analyses = some_list_of_analyses
$scope.included = 0
$scope.excluded = $scope.analyses.length

$scope.set = function(include){

//additional logic involving $scope.analyses

  if(include){
    $scope.included += 1
    $scope.excluded -= 1
  }
  else{
    $scope.excluded += 1
    $scope.included -= 1
  }
}

Currently, when starting with all analyses excluded (as set during initialization), clicking a button results in incorrect values being displayed (-1 used / n+1 excluded) because ng-click triggers before the variable update. Are there any alternatives to make ng-click wait until variables are bound or to modify $scope.analyses directly within the ng-click method?

I appreciate any suggestions!

EDIT: The ng-model statement is required for the btn-checkbox directive, which presents a toggle for including/excluding analyses. Any advice on alternative directives or CSS implementations for indicating inclusion/exclusion would be helpful!

javascript angularjs angularjs-ng-model

Answer 1

Answer №1

It's a bit unclear to me, but I believe we can make things simpler.

Let's assume that every evaluation possesses a property referred to as selected.

This enables us to create a couple of functions like so:

$scope.selected = function() {
  var count = 0;
  for(var i = 0; i < $scope.evaluations.length; i++) {
    if($scope.evaluations[i].selected) {
      count++;
    }
  }
  return count;
};

$scope.unselected = function() {
  var count = 0;
  for(var i = 0; i < $scope.evaluations.length; i++) {
    if(!$scope.evaluations[i].selected) {
      count++;
    }
  }
  return count;
};

You can handle the refactoring process to maintain DRY principles. Subsequently, your user interface can display something similar to this:

Number of analyzed cases: {{selected()}} chosen / {{unselected()}} not selected
<div ng-repeat="evaluation in evaluations"><br>
<label class="btn btn-success" ng-model="evaluation" ng-click="set(evaluation)" btn-checkbox>

Your click function can be straightforward (remember that we are now passing the evaluation object, hence you can eliminate the ng-model attribute):

$scope.set = function(evaluation) {
  $scope.evaluation.selected = !$scope.evaluation.selected;
};

Answer 2

It's a bit unclear to me, but I believe we can make things simpler.

Let's assume that every evaluation possesses a property referred to as selected.

This enables us to create a couple of functions like so:

$scope.selected = function() {
  var count = 0;
  for(var i = 0; i < $scope.evaluations.length; i++) {
    if($scope.evaluations[i].selected) {
      count++;
    }
  }
  return count;
};

$scope.unselected = function() {
  var count = 0;
  for(var i = 0; i < $scope.evaluations.length; i++) {
    if(!$scope.evaluations[i].selected) {
      count++;
    }
  }
  return count;
};

You can handle the refactoring process to maintain DRY principles. Subsequently, your user interface can display something similar to this:

Number of analyzed cases: {{selected()}} chosen / {{unselected()}} not selected
<div ng-repeat="evaluation in evaluations"><br>
<label class="btn btn-success" ng-model="evaluation" ng-click="set(evaluation)" btn-checkbox>

Your click function can be straightforward (remember that we are now passing the evaluation object, hence you can eliminate the ng-model attribute):

$scope.set = function(evaluation) {
  $scope.evaluation.selected = !$scope.evaluation.selected;
};

Answer 3

Answer №2

What if you retrieve the analysis.included from the scope within your function instead of passing it in?

I have put together a demo on Plunker to illustrate

Essentially, the HTML looks like this:

 Number of bisulfite sequences: {{included}} used / {{excluded}} excluded

<div ng-repeat="analysis in analyses">
  <br />
  <label class="btn btn-success" ng-model="analysis.include"  btn-checkbox>
    <button ng-click="set($index)">Click Me!</button>
  </label>
</div>

In this case, you pass in the $index so that you can reference it on $scope in the controller. Then, in your controller:

$scope.set = function(i){

 var include = $scope.analyses[i].include;
 //more code involving $scope.analyses

 if(include){
  $scope.included += 1
  $scope.excluded -= 1
 }
 else{
  $scope.excluded += 1
  $scope.included -= 1
 }
};

The demo on Plunker showed promising results, with the included count increasing and the excluded count decreasing.

Update: Check out the new version of the Plunker which now toggles between included and excluded instead of just incrementing.

Additionally, the set function has been updated as follows:

$scope.set = function(i){

 $scope.analyses[i].include = !$scope.analyses[i].include;

 include = $scope.analyses[i].include

 //more code involving $scope.analyses

if(include){
  $scope.included += 1
  $scope.excluded -= 1
 } else {
  $scope.excluded += 1
  $scope.included -= 1
 }
};

Answer 4

What if you retrieve the analysis.included from the scope within your function instead of passing it in?

I have put together a demo on Plunker to illustrate

Essentially, the HTML looks like this:

 Number of bisulfite sequences: {{included}} used / {{excluded}} excluded

<div ng-repeat="analysis in analyses">
  <br />
  <label class="btn btn-success" ng-model="analysis.include"  btn-checkbox>
    <button ng-click="set($index)">Click Me!</button>
  </label>
</div>

In this case, you pass in the $index so that you can reference it on $scope in the controller. Then, in your controller:

$scope.set = function(i){

 var include = $scope.analyses[i].include;
 //more code involving $scope.analyses

 if(include){
  $scope.included += 1
  $scope.excluded -= 1
 }
 else{
  $scope.excluded += 1
  $scope.included -= 1
 }
};

The demo on Plunker showed promising results, with the included count increasing and the excluded count decreasing.

Update: Check out the new version of the Plunker which now toggles between included and excluded instead of just incrementing.

Additionally, the set function has been updated as follows:

$scope.set = function(i){

 $scope.analyses[i].include = !$scope.analyses[i].include;

 include = $scope.analyses[i].include

 //more code involving $scope.analyses

if(include){
  $scope.included += 1
  $scope.excluded -= 1
 } else {
  $scope.excluded += 1
  $scope.included -= 1
 }
};

Answer 5

Answer №3

It might be beneficial to adjust the method of tracking the included/excluded values.

Instead of manipulating values directly, consider simply monitoring the length of the array for a smoother process.

Let's visualize this with some HTML implementation:

<div ng-controller="solutionController">
Number of bisulfite sequences: {{included.length}} used / {{analyses.length - included.length}} excluded
<div ng-repeat="analysis in analyses">
    <br />
    <label class="btn btn-success" ng-click="include(analysis)" btn-checkbox=""></label>
</div>

For the controller logic, consider something like this:

angular.module("routerApp").controller("solutionController", ["$scope", function($scope){
    $scope.included = [];
    $scope.analyses = ["sodium", "sulfur", "calcium"];

    $scope.include = function(includeMe){
        $scope.included.push(includeMe);
    };

}]);

The specifics of your analyses objects may vary, but this approach should help bind counts accurately to array lengths.

Answer 6

It might be beneficial to adjust the method of tracking the included/excluded values.

Instead of manipulating values directly, consider simply monitoring the length of the array for a smoother process.

Let's visualize this with some HTML implementation:

<div ng-controller="solutionController">
Number of bisulfite sequences: {{included.length}} used / {{analyses.length - included.length}} excluded
<div ng-repeat="analysis in analyses">
    <br />
    <label class="btn btn-success" ng-click="include(analysis)" btn-checkbox=""></label>
</div>

For the controller logic, consider something like this:

angular.module("routerApp").controller("solutionController", ["$scope", function($scope){
    $scope.included = [];
    $scope.analyses = ["sodium", "sulfur", "calcium"];

    $scope.include = function(includeMe){
        $scope.included.push(includeMe);
    };

}]);

The specifics of your analyses objects may vary, but this approach should help bind counts accurately to array lengths.

Answer 7

Answer №4

It seems like there may be a confusion in your conditional logic within the $scope.set function. The condition is expecting a true value before increasing the include property, but this doesn't seem to be occurring based on the example provided in this demo.

The key difference here lies in ensuring that the include property is defined for the first three analyses and set to true. Your code execution is as intended, the issue appears to be with how the analysis objects are structured.

Answer 8

It seems like there may be a confusion in your conditional logic within the $scope.set function. The condition is expecting a true value before increasing the include property, but this doesn't seem to be occurring based on the example provided in this demo.

The key difference here lies in ensuring that the include property is defined for the first three analyses and set to true. Your code execution is as intended, the issue appears to be with how the analysis objects are structured.

Trigger ng-click after ng-model updates

Answer №1

Answer №2

Answer №3

Answer №4

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