What is the best way to implement "ng-" to function smoothly with all attributes?

Question

What is the best way to implement "ng-" to function smoothly with all attributes?

Is there a generic attribute like ng-enabled, ng-src, ng-class that can work for any attribute (ng-x)?

For instance, here is the code snippet:

<div ng-attrbuite1="a" ng-otherattribute="b"></div>

I wish to achieve the following output:

<div attribute1="a_value" attribute2="b_value_in_scope">

I am unaware of the attribute names that will exist in the HTML during runtime.

javascript angularjs

Answer 1

Answer №1

If you want to enhance your code, using directives is a great option. Here's an example that demonstrates how to implement directives:

HTML

<div ng-app="myApp">
  <div ui-foo="foo">foo scope variable: {{foo}}</div>
</div>

JS

angular.module('myApp', []).directive('uiFoo',
  function() {
    return {
      restrict: 'EAC',
      link: function($scope, element, attrs, controller) {
        $scope.foo = attrs.uiFoo;
      }
    };
  }
);

Answer 2

If you want to enhance your code, using directives is a great option. Here's an example that demonstrates how to implement directives:

HTML

<div ng-app="myApp">
  <div ui-foo="foo">foo scope variable: {{foo}}</div>
</div>

JS

angular.module('myApp', []).directive('uiFoo',
  function() {
    return {
      restrict: 'EAC',
      link: function($scope, element, attrs, controller) {
        $scope.foo = attrs.uiFoo;
      }
    };
  }
);

Answer 3

Answer №2

If you are looking to create a catch-all feature where attributes prefixed with, for example, my, are evaluated and then set to their respective non-prefixed attribute values, you will need to:

Create a custom directive.
Retrieve all attributes on the element (accessible via $attrs).
Evaluate the attribute value.
Set the actual attribute on the element.

I won't go into detail on creating the directive itself, but you can learn more about it here.

Within the link function of your directive, one of the arguments passed in will be $attrs. $attrs contains both the normalized (camel-cased) and non-normalized attribute names, along with their respective evaluated values (if using expressions), as well as some helper methods.

You can iterate over the keys of $attrs (or $attrs.$attr), filter out any unwanted keys like ng-model or ng-selected, evaluate the value, and set the corresponding non-prefixed attribute.

Object.keys($attrs).filter(function(key){
    // Filter out unwanted keys like ngModel, ngSelect, etc.
    return /^my/.test(key);
}).forEach(function(key){
    // $attrs.$attr contains the non-normalized versions of the attributes
    // This example assumes you'll prefix with `my`
    // Remove 'my-' to get the attribute name to set
    var attrName = $attrs.$attr[key].replace("my-","");

    // Use $parse() if you want to use a scope property name
    // For example, my-attribute="somePropertyName"
     $attrs.$set(attrName,$parse($attrs[key])($scope));

    // Just use $attrs[key] if using an expression
    // For example, my-attribute="{{somePropertyName}}"
     $attrs.$set(attrName,$attrs[key]);
});

angular.module("test",[])
.controller("ctrl",function($scope){
 
  $scope.someprop = "Some Value";
 
})
.directive("caAttr",function($parse){
  return {
    restrict : 'A',
    link : function($scope, $element, $attrs) {
      console.log($attrs);
      Object.keys($attrs).filter(function(key){
        return /^my/.test(key);
      }).forEach(function(key){
        var attrName = $attrs.$attr[key].replace("my-","");
        $attrs.$set(attrName,$parse($attrs[key])($scope));
      });
      angular.element("#log").text( angular.element("#container").html() );
    }
  };
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="test" ng-controller="ctrl">
  <div id="container">
    <div ng-model="mymodel" ng-selected="{{nothing}}" my-stack="someprop" ca-attr></div>
  </div>
  <div id="log"></div>
</div>

Answer 4

If you are looking to create a catch-all feature where attributes prefixed with, for example, my, are evaluated and then set to their respective non-prefixed attribute values, you will need to:

Create a custom directive.
Retrieve all attributes on the element (accessible via $attrs).
Evaluate the attribute value.
Set the actual attribute on the element.

I won't go into detail on creating the directive itself, but you can learn more about it here.

Within the link function of your directive, one of the arguments passed in will be $attrs. $attrs contains both the normalized (camel-cased) and non-normalized attribute names, along with their respective evaluated values (if using expressions), as well as some helper methods.

You can iterate over the keys of $attrs (or $attrs.$attr), filter out any unwanted keys like ng-model or ng-selected, evaluate the value, and set the corresponding non-prefixed attribute.

Object.keys($attrs).filter(function(key){
    // Filter out unwanted keys like ngModel, ngSelect, etc.
    return /^my/.test(key);
}).forEach(function(key){
    // $attrs.$attr contains the non-normalized versions of the attributes
    // This example assumes you'll prefix with `my`
    // Remove 'my-' to get the attribute name to set
    var attrName = $attrs.$attr[key].replace("my-","");

    // Use $parse() if you want to use a scope property name
    // For example, my-attribute="somePropertyName"
     $attrs.$set(attrName,$parse($attrs[key])($scope));

    // Just use $attrs[key] if using an expression
    // For example, my-attribute="{{somePropertyName}}"
     $attrs.$set(attrName,$attrs[key]);
});

angular.module("test",[])
.controller("ctrl",function($scope){
 
  $scope.someprop = "Some Value";
 
})
.directive("caAttr",function($parse){
  return {
    restrict : 'A',
    link : function($scope, $element, $attrs) {
      console.log($attrs);
      Object.keys($attrs).filter(function(key){
        return /^my/.test(key);
      }).forEach(function(key){
        var attrName = $attrs.$attr[key].replace("my-","");
        $attrs.$set(attrName,$parse($attrs[key])($scope));
      });
      angular.element("#log").text( angular.element("#container").html() );
    }
  };
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="test" ng-controller="ctrl">
  <div id="container">
    <div ng-model="mymodel" ng-selected="{{nothing}}" my-stack="someprop" ca-attr></div>
  </div>
  <div id="log"></div>
</div>

What is the best way to implement "ng-" to function smoothly with all attributes?

Answer №1

Answer №2

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