What is the best way to implement the $anchorScroll feature in AngularJS specifically for a hidden div?


I am currently working on a web application using angularjs, and I have multiple nested div elements that correspond to selectable items. One of my main challenges is ensuring that when a user clicks on a div element, it scrolls into view correctly on the page. You can see an example of this in the official AngularJS documentation:
http://plnkr.co/edit/qncMfyJpuP2r0VUz0ax8?p=preview

Currently, each div has a ng-click="gotoAnchor(x)" event attached to it. However, due to a header on the page, the first div with the anchor and click event is not always at the top of the screen. This results in the header blocking the view if scrolled to. Is there a way to activate the anchor only when the div is partially hidden off-screen? Alternatively, if you have any other suggestions for achieving this functionality without anchors, I would appreciate your input.

Thank you for your help.

javascriptjqueryhtmlcssangularjs

Answer №1

It seems like the issue you're facing is related to using $anchorScroll where your header is either

a: Getting covered by the scrolling div, or

b: Partially covering the scrolled div.

Here are two possible solutions for this problem:

First Solution

Ensure that you properly layer your elements using CSS. If your header is fixed, it should have a higher z-index compared to other divs.

.header  { position: fixed; top:0; width: 100%; z-index: 99}
.content { position: relative; margin-top: 10px; z-index: 1;}

NOTE: Z-index only applies to positioned elements (reference)

Second Solution

Use $anchorScroll.yOffset to adjust the scroll distance to accommodate the height of the header. Referencing Angular docs, implement the following in your application:

.run(['$anchorScroll', function($anchorScroll) {
  $anchorScroll.yOffset = 50;   // always scroll by 50 extra pixels
}])

Replace 50 with the actual pixel height of your header.

Regarding Element Visibility

There are several libraries and directives available to check the visibility of an element. You can try using https://github.com/thenikso/angular-inview, which allows specifying actions when certain parts of the div are visible.

Note Properly positioning the first div on the page can eliminate the need for scrolling, as demonstrated in this example.

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