There seems to be some IE incompatible javascript here. Are there any browser compatibility experts around?

Question

This javascript works fine in FF v3.5.3, but not in IE 6.02. Can someone who is experienced in IE JS compatiblity please review this code for possible incompatibilities? I didn't include the code for all the functions being called because that would make my code sample huge, but I have tested the functions before in IE and they worked. I think the problem is in how I'm iterating over the JSON data. Thanks!

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  cities[key]["city_link"] = cityLink;
}  drawCities(cities);
  param = { "routes": [{ "id": 1, "count": 9},{ "id": 2, "count": 14},{ "id": 3, "count": 10},{ "id": 4, "count": 8},{ "id": 5, "count": 7},{ "id": 6, "count": 7},{ "id": 7, "count": 5},{ "id": 8, "count": 7},{ "id": 9, "count": 6},{ "id": 10, "count": 12},{ "id": 11, "count": 8},{ "id": 12, "count": 8},{ "id": 13, "count": 6},{ "id": 14, "count": 8},{ "id": 15, "count": 4},{ "id": 16, "count": 7},{ "id": 17, "count": 4},{ "id": 18, "count": 8},{ "id": 19, "count": 6},{ "id": 20, "count": 5},{ "id": 21, "count": 5},{ "id": 22, "count": 10},{ "id": 23, "count": 10},{ "id": 24, "count": 9},{ "id": 25, "count": 6},{ "id": 26, "count": 1},{ "id": 27, "count": 4},{ "id": 28, "count": 10},{ "id": 29, "count": 6},{ "id": 30, "count": 6},{ "id": 31, "count": 2},{ "id": 32, "count": 9},{ "id": 33, "count": 6},{ "id": 34, "count": 4},{ "id": 35, "count": 6},{ "id": 36, "count": 5},{ "id": 37, "count": 5},{ "id": 38, "count": 5},{ "id": 39, "count": 5},{ "id": 40, "count": 2},{ "id": 41, "count": 6},{ "id": 42, "count": 7},{ "id": 43, "count": 10},{ "id": 44, "count": 10},{ "id": 45, "count": 3},{ "id": 46, "count": 5},{ "id": 47, "count": 6},{ "id": 48, "count": 9},{ "id": 49, "count": 7},{ "id": 50, "count": 7},{ "id": 51, "count": 5},{ "id": 52, "count": 10},{ "id": 53, "count": 8},{ "id": 54, "count": 7},{ "id": 55, "count": 5},{ "id": 56, "count": 7},{ "id": 57, "count": 4},{ "id": 58, "count": 4},{ "id": 59, "count": 8},{ "id": 60, "count": 6},{ "id": 61, "count": 4},{ "id": 62, "count": 8},{ "id": 63, "count": 3},{ "id": 64, "count": 6},{ "id": 65, "count": 3},{ "id": 66, "count": 7},{ "id": 67, "count": 8},{ "id": 68, "count": 4},{ "id": 69, "count": 6},{ "id": 70, "count": 8},{ "id": 71, "count": 11},{ "id": 72, "count": 11},{ "id": 73, "count": 9},{ "id": 74, "count": 4},{ "id": 75, "count": 8}] };
  var ajax = new Ajax();
  ajax.post("http://railsacrosseurope.com/turn/update_track", param);
</script>

Answer 1

If you are not working with some js library, as i can see you dont, i sugest visit to site below and check your code there and fix those errors that are reported. That may give you some insight on whats going on.

http://jslint.com/

Answer 2

Running your code through jslint, I got this warning

Problem at line 32 character 5: Bad for in variable 'key'.

Could be a DOM global variable or something. Change it and see what happens. Also, your for..in loop doesn't do what it is supposed to. It is for iterating though object properties, not through elements of an array. Use a plain for loop with an index.

Answer 3

I found the problem. It wasn't in the code listed here. I had declared some variables as 'const' which IE doesn't recognize, and I was also using the for..in construct on arrays which I replaced with an indexed for loop. Everything fell in place once I discovered the js debugger in IE8. That sped things up tremendously! Now everything is looking good. Thanks for all the help.