embarrassed-and-proud.js

$(document).ready(function(){
  // Apparently I am not smart enough to figure out how to
  // set the selected value on the new date_select form helper in Rails 4
  // So, I had to create a client side solution
  var url = document.location.href.split("?")[1];

  // If the url does not have a query string
  // Nothing else matters
  if(url) {
    var params = url.split("&");
    var start_date_year = "";
    var start_date_month = "";
    var start_date_day = "";
    var end_date_year = "";
    var end_date_month = "";
    var end_date_day = "";


    set_param_values();
    set_start_date_options();
    set_end_date_options();
  }

  // Grab all three fields for start_date and find a match
  // based on the query string. Once you find it, make it selected
  function set_start_date_options() {
      $("#start_date_year option").each(function(){
        if ($(this).val() == start_date_year) $(this).attr("selected", "selected");
      })

      $("#start_date_month option").each(function(){
        if ($(this).val() == start_date_month) $(this).attr("selected", "selected");
      })

      $("#start_date_day option").each(function(){
        if ($(this).val() == start_date_day) $(this).attr("selected", "selected");
      })
    }

  // Grab all three fields for end_date and find a match
  // based on the query string. Once you find it, make it selected
  function set_end_date_options() {
    $("#end_date_year option").each(function(){
      if ($(this).val() == end_date_year) $(this).attr("selected", "selected");
    })

    $("#end_date_month option").each(function(){
      if ($(this).val() == end_date_month) $(this).attr("selected", "selected");
    })

    $("#end_date_day option").each(function(){
      if ($(this).val() == end_date_day) $(this).attr("selected", "selected");
    })  
  }

  
  // Pull out all the query params for the data we need and save it
  function set_param_values() {
    $(params).each(function(k,v) { 
      if (v.match(/(start_date).+(year)/))  start_date_year = v.split("=")[1];
      if (v.match(/(start_date).+(month)/)) start_date_month = v.split("=")[1];
      if (v.match(/(start_date).+(day)/))   start_date_day = v.split("=")[1];
      if (v.match(/(end_date).+(year)/))    end_date_year = v.split("=")[1];
      if (v.match(/(end_date).+(month)/))   end_date_month = v.split("=")[1];
      if (v.match(/(end_date).+(day)/))     end_date_day = v.split("=")[1];
    });
  }
});