Amnestic Amnestic - 2 months ago 17
jQuery Question

Back button / backspace does not work with window.history.pushState

I have made a solution for my website which includes using ajax to present the general information on the website. In doing this, I am changing the URL every time a user loads some specific content with the window.history.pushState method. However, when I press backspace or press back, the content of the old url is not loaded (however the URL is loaded).

I have tried several solutions presented on SO without any luck.

Here is an example of one of the ajax functions:

$(document).ready(function(){
$(document).on("click",".priceDeckLink",function(){
$("#hideGraphStuff").hide();
$("#giantWrapper").show();
$("#loadDeck").fadeIn("fast");
var name = $(this).text();
$.post("pages/getPriceDeckData.php",{data : name},function(data){
var $response=$(data);
var name = $response.filter('#titleDeck').text();
var data = data.split("%%%%%%%");
$("#deckInfo").html(data[0]);
$("#textContainer").html(data[1]);
$("#realTitleDeck").html(name);
$("#loadDeck").hide();
$("#hideGraphStuff").fadeIn("fast");
loadGraph();
window.history.pushState("Price Deck", "Price Deck", "?p=priceDeck&dN="+ name);
});
});


Hope you guys can help :)

Answer

pushState alone will not make your page function with back/forward. What you'd need to do is listen to onpopstate and load the contents yourself similar to what would happen on click.

var load = function (name, skipPushState) {
  $("#hideGraphStuff").hide();
  // pre-load, etc ...

  $.post("pages/getPriceDeckData.php",{data : name}, function(data){
    // on-load, etc ...

    // we don't want to push the state on popstate (e.g. 'Back'), so `skipPushState`
    // can be passed to prevent it
    if (!skipPushState) {
      // build a state for this name
      var state = {name: name, page: 'Price Deck'};
      window.history.pushState(state, "Price Deck", "?p=priceDeck&dN="+ name);
    }
  });
}

$(document).on("click", ".priceDeckLink", function() {
  var name = $(this).text();
  load(name);
});

$(window).on("popstate", function () {
  // if the state is the page you expect, pull the name and load it.
  if (history.state && "Price Deck" === history.state.page) {
    load(history.state.name, true);
  }
});

Note that history.state is a somewhat less supported part of the history API. If you wanted to support all pushState browsers you'd have to have another way to pull the current state on popstate, probably by parsing the URL.

It would be trivial and probably a good idea here to cache the results of the priceCheck for the name as well and pull them from the cache on back/forward instead of making more php requests.

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