ShawnMcCool

ShawnMcCool

Problem with LiveView Anchors + History

The following testing live view has anchor tags. When clicked, the anchors work fine and navigate the browser to the correct location. When I press the browser “back” button, the anchor changes in the history and the browser does not change scroll positions.

Is there a way to recover this forward/backward navigation behavior?

LiveView: 0.20.2

defmodule LiveAnchorTestWeb.AnchorLive do
  use LiveAnchorTestWeb, :live_view

  def mount(_params, _session, socket) do
    {:ok, socket}
  end

  def render(assigns) do
    ~H"""
    <h1><a id="heading">heading</a></h1>
    <br />
    <a href="#footing">go to footing</a>
    hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br />
    hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br />
    hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br />
    hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br />
    hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br />
    hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br />
    hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br /> hi<br />
    hi<br /> hi<br /> hi<br /> hi<br />
    <h2><a id="footing">footing</a></h2>
    <br />
    <a href="#heading">go to heading</a>
    """
  end
end

Most Liked

felix-starman

felix-starman

Something like the JavaScript below combined with a handle_params that uses a push event could probably get you what you want

  // Scroll to target selector from event
  window.addEventListener("phx:scroll-into-view", e => {
    let target;
    if (e.target) { target = e.target };
    if (e.detail.id) { target = document.getElementById(e.detail.id) };
    if (target == window) { return };

    let behavior = e.detail.behavior || "auto";
    let block = e.detail.block || "start";
    let inline = e.detail.inline || "nearest";

    target.scrollIntoView({ behavior, block, inline });
  });

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