AngularJS directives adapting to changes in DOM attributes

Question

AngularJS directives adapting to changes in DOM attributes

I have been developing a scrollspy module for AngularJS, and I am facing the challenge of keeping the scrollspy data up to date when dealing with dynamic content on the page. What is the best approach in AngularJS to address this issue?

Is it advisable for any directive that manipulates the DOM to $broadcast an event that the scrollspy module can listen for, enabling it to update its position data?

Alternatively, should the scrollspy module periodically check for changes in scrollHeight using $timeout every x seconds?

Or perhaps there is a way to bind and monitor changes in DOM attribute values (such as offsetTop, offsetHeight, scrollHeight, rather than data attributes)?

Update: Code base added to GitHub

javascript angularjs

Answer 1

Answer №1

It appears that Mutation Observers are essential, but unfortunately they are only compatible with the latest web browsers.

var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
if( MutationObserver ) {

    for ( var i = 0; i < spyService.spies.length; i++ ) {
        var spy = spyService.spies[i].scope.spy;
        var target = document.getElementById(spy);

        var config = {
            attributes: true,
            childList: true,
            characterData: true,
            subtree: true
        };
        var observer = new MutationObserver(function(mutations) {
            mutations.forEach(function(mutation) {
                console.warn('mutation observation');
            });
        }).observe(target, config);
    }
}
else {
    console.warn('no mutation observers here');
    $interval(function() {
        angular.element( document ).ready( function() {
            console.log('refreshing');
        });
    }, 2000);

}

Currently on the lookout for a polyfill that functions properly.

EDIT: Implemented polling as an alternative if Mutation Observers are not supported.

Answer 2

It appears that Mutation Observers are essential, but unfortunately they are only compatible with the latest web browsers.

var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
if( MutationObserver ) {

    for ( var i = 0; i < spyService.spies.length; i++ ) {
        var spy = spyService.spies[i].scope.spy;
        var target = document.getElementById(spy);

        var config = {
            attributes: true,
            childList: true,
            characterData: true,
            subtree: true
        };
        var observer = new MutationObserver(function(mutations) {
            mutations.forEach(function(mutation) {
                console.warn('mutation observation');
            });
        }).observe(target, config);
    }
}
else {
    console.warn('no mutation observers here');
    $interval(function() {
        angular.element( document ).ready( function() {
            console.log('refreshing');
        });
    }, 2000);

}

Currently on the lookout for a polyfill that functions properly.

EDIT: Implemented polling as an alternative if Mutation Observers are not supported.

Answer 3

Answer №2

Attempting this approach should be effective... although CSS transitions do not appear to reflect any changes.

scope.$watch(function(){
    return elem[0].offsetLeft;
}, function(x){
    console.log('ELEMENT POSITION '+x);
});

Answer 4

Attempting this approach should be effective... although CSS transitions do not appear to reflect any changes.

scope.$watch(function(){
    return elem[0].offsetLeft;
}, function(x){
    console.log('ELEMENT POSITION '+x);
});

Answer 5

Answer №3

While I don't have the exact code to reference, my recommendation would be for your scrollspy module to regularly monitor $rootScope for any $digest calls by utilizing $rootScope.$watch.

$rootScope.$watch(function() {
  // Implement scrollspy data updates here
}

Answer 6

While I don't have the exact code to reference, my recommendation would be for your scrollspy module to regularly monitor $rootScope for any $digest calls by utilizing $rootScope.$watch.

$rootScope.$watch(function() {
  // Implement scrollspy data updates here
}

AngularJS directives adapting to changes in DOM attributes

Answer №1

Answer №2

Answer №3

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