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Editorial Team
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Asked: 2026-05-30T16:38:28+00:00

Railscasts (and I’ve seen this technique elsewhere) seems to be modifying the URL (by

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Railscasts (and I’ve seen this technique elsewhere) seems to be modifying the URL (by adding/changing a query string) but delivers back an ajax request without reloading the entire page. How are they modifying the URL without triggering a whole page refresh? It doesn’t appear at least to be using HTML5 history, since there is no history created (can’t go back/forward).

http://railscasts.com/episodes/81-fixtures-in-rails-2-0

Then click any of the tabs “Show Notes”, “Comments”, “Similar Episodes” and watch how the query string changes, but the page does not refresh (confirmed via Firebug).

Any ideas?

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1 Answer

  1. Editorial Team

    It uses history.replaceState(). Quoth MDC:

    history.replaceState() operates exactly like history.pushState() except that replaceState() modifies the current history entry instead of creating a new one.

    No new history entry, nothing to go back/forward to.

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