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AngularJS: Is There a Better Way to Handle Dynamic Navigation Height Changes?
AngularJS: Is There a Better Way to Handle Dynamic Navigation Height Changes?
AngularJS: Is There a Better Way to Handle Dynamic Navigation Height Changes?
The age-old problem of maintaining a fixed navigation bar with variable height content below it has plagued developers for some time. Traditionally, a timer has been used to periodically check for height changes, triggering a margin adjustment when detected. However, this approach has drawbacks:
- Introduces a timer dependency
- Causes a delay in responding to height adjustments
A Superior Solution: AngularJS Watchers
A more elegant and efficient solution is to leverage AngularJS watchers:
/*
* Get notified when height changes and change margin-top
*/
.directive( 'emHeightTarget', function() {
return {
link: function( scope, elem, attrs ) {
scope.$watch( '__height', function( newHeight, oldHeight ) {
elem.attr( 'style', 'margin-top: ' + (58 + newHeight) + 'px' );
} );
}
}
} )
/*
* Checks every $digest for height changes
*/
.directive( 'emHeightSource', function() {
return {
link: function( scope, elem, attrs ) {
scope.$watch( function() {
scope.__height = elem.height();
} );
}
}
} )In this implementation:
- emHeightTarget directive watches the __height property and updates the margin when changes occur.
- emHeightSource directive registers a watcher that updates __height with the current element's height every $digest cycle.
This approach eliminates the need for a timer and provides a more streamlined and responsive solution.
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