I am utilizing the scope value to pass to a directive through attrs. Initially, I encounter an issue where the value of min is undefined upon first load, but it functions correctly with $watch. See this example.
link: function(scope, elm, attrs) {
scope.$watch(function (){return attrs.min}, function (newValue, oldValue) {
console.log('oldValue=' + oldValue);
console.log('newValue=' + newValue);
//do something
});
console.log(attrs.min);
}
Have you considered utilizing $observe as an alternative approach?
app.directive('customDirective', function() {
return {
restrict: 'A',
link: function(scope, element, attributes) {
attributes.$observe('max', function(newVal) {
console.log(newVal);
});
}
};
});
It appears that the value of {{message}} is not being evaluated prior to the directive's postlink phase.
An alternative approach would be to utilize a scope:
app.directive('exampleDirective1', function() {
return {
restrict: 'E',
scope: {
min: '='
},
link: function(scope, elm, attrs) {
scope.$watch('min', function (newValue, oldValue) {
console.log('oldValue=' + oldValue);
console.log('newValue=' + newValue);
//perform some action
});
console.log(scope.min);
console.log(attrs.min);
}
};
});
Additionally,
With template: <example-directive1 min="message"></example-directive1>
It's quite peculiar, I conducted a test using compile, prelink, and postlink along with extensive logging, and the results were unexpected:
function MyCtrl($scope) {
$scope.message = 'hello';
console.log('$scope.message set to hello');
}
app.directive('exampleDirective1', function() {
return {
restrict: 'E',
compile: function(tElement, tAttrs) {
console.log('currently at compile, attrs.min = ', tAttrs.min);
return {
post: function postLink(scope, elm, attrs) {
scope.$watch(function (){return attrs.min}, function (newValue, oldValue) {
console.log('currently, attrs.min = ', attrs.min);
});
console.log('currently at postlink, attrs.min = ', attrs.min);
},
pre: function prelink(scope,elm , attrs) {
console.log('currently at prelink, attrs.min = ', attrs.min);
}
};
}
};
});
The value of scope is already assigned when prelink is executed. Nevertheless, it appears that the arguments are being evaluated between postlink and prelink.
EDIT: Upon further investigation, it seems that in your version of Angular, $compile initializes args as 'undefined'. You can check this out in https://code.angularjs.org/1.0.0/angular-1.0.0.js at line 4434.
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