How to get listitems from different lists using Js

Question

Hi,
I want to search my web for all the lists that contains a certain checkbox column (get it by name).
Once I have this list, I want to iterate through all of them and get the list items with this column checked.
I got the lists, but when I tried to get the fields - I got an error - the system doesn't recognizes the fields.
To be more specific - in the code I've posted below in method onGetFieldsSuccess I'm getting an error in the first line, as I can't retrieve the enumerator.
In the MSDN I saw how to retrieve list's fields, but there it was a specific list. Is there a way to get the lists who have a specific field?
Any help will be appreciated
<script> 
ExecuteOrDelayUntilScriptLoaded(showFavorites, "sp.js"); 
var ctx;
var lists;
function showFavorites()
     ctx = new SP.ClientContext.get_current();
     var web = ctx.get_site().openWeb("/legal");
     ctx.load(web);
     lists = ctx.get_site().openWeb("/legal").get_lists();
     ctx.load(lists);
     ctx.executeQueryAsync(Function.createDelegate(this, this.onGetListSuccess), Function.createDelegate(this, this.onFail));
var list;
var fields;
function onGetListSuccess(sender, args) {
          var listEnumerator = lists.getEnumerator();
          while (listEnumerator.moveNext()) {
               list = listEnumerator.get_current();
               ctx.load(list);
               fields = list.get_fields();
                ctx.load(fields , 'Include(Title)');
               ctx.executeQueryAsync(Function.createDelegate(this, this.onGetFieldsSuccess), Function.createDelegate(this, this.onFail));
function onGetFieldsSuccess(sender, args)
      var fieldEnumerator = fields.getEnumerator();
    while (fieldEnumerator.moveNext()) {
        var field = fieldEnumerator.get_current();
        var name = field.get_staticName();
        if (name == "MyFavorite") {
            alert(list.get_title()); 
            break;
function onFail(sender, args) {
    console.log(args.get_message());
</script>​​​​​​​​​​​​​​​​​​​​​​​​​

Answer 1

Thanks a lot Thriggle,
I've used your advise, and other then some syntax problems (as you predicted :) everything worked just fine!
(I had to add another executeQueryAsync to get the listItems files - but that wasn't a problem).
The only issue that I have is that it takes FOREVER to load, and once it does load - it returns duplicates of the same results (sometimes 3, sometime up to 10).
I only have 13 tables with about 50 list items in each table, and from that only 6 tables have the specified field - so it shouldn't have taken THAT long (sometimes I see the results after 45 seconds after the page finished loading).
should I have used a new client context for each query? or is there a place where I'm getting unnecessary loops (I've made sure that I have only 1 list item that matches the 
I'm resending the complete code. maybe there's something I've missed here.
<cfheader name="X-XSS-Protection" value="0"></cfheader>​​​​​ ​​​<script>
ExecuteOrDelayUntilScriptLoaded(showFavorites, "sp.js"); 
function showFavorites()
     var displayTable = document.getElementById("myFavoritesTable");
     for(var i = displayTable.rows.length - 1; i > 0; i--)
            displayTable.deleteRow(i);
   var fieldToLookFor = "MyFavorite";
     var ctx = new SP.ClientContext.get_current();
     var web = ctx.get_site().openWeb("/legal");
     var lists = web.get_lists();
     ctx.load(web);
     ctx.load(lists, 'Include(Title,Fields)');
     ctx.executeQueryAsync(Function.createDelegate(this, function(){
     var matchingLists = [];
     var listEnum = lists.getEnumerator();
     while(listEnum.moveNext()){
          var currList = listEnum.get_current();
          var containsField = false;
          var fields = currList.get_fields();
          var fieldEnum = fields.getEnumerator();
          while(fieldEnum.moveNext()){
               if(fieldEnum.get_current().get_staticName() == fieldToLookFor){ containsField = true; break;}
          if(containsField){
              matchingLists.push(currList.get_title());            
     //alert(matchingLists);
     var i = 0;
     while(i < matchingLists.length){
          var list = lists.getByTitle(matchingLists[i]);
          i++;
          var camlQuery = new SP.CamlQuery();
          var camlString = '<View><Query><FieldRef Name=\'' + fieldToLookFor + '\' /><Value Type=\'Integer\'>1</Value></Query></View>';
          camlQuery.set_viewXml(camlString);
          var items = list.getItems(camlQuery);
          ctx.load(items);
          ctx.executeQueryAsync(Function.createDelegate(this,function(){
               var itemEnum = items.getEnumerator();
               while(itemEnum.moveNext()){
                    var item = itemEnum.get_current();
                    var file = item.get_file();
                    ctx.load(file);
                    ctx.executeQueryAsync(Function.createDelegate(this,function(){
                    var table = document.getElementById("myFavoritesTable");
// Create an empty <tr> element and add it to the 1st position of the table:
var row = table.insertRow(-1);
// Insert new cells (<td> elements) at the 1st and 2nd position of the "new" <tr> element:
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
var cell3 = row.insertCell(2);
var cell4 = row.insertCell(3);
cell1.innerHTML = "XX";
cell2.innerHTML = item.get_id();
cell3.innerHTML = "<a href='" + item.get_file().get_serverRelativeUrl() + "' alt=''>" + item.get_file().get_name() + "</a>" ;
cell4.innerHTML = "";
                 }),Function.createDelegate(this,function(sender, args){
              alert(args.get_message());
          }),Function.createDelegate(this,function(sender, args){
              alert(args.get_message());
}), Function.createDelegate(this, function(sender, args){ 
     alert(args.get_message()); 
</script>​​​​​ 
<table id="myFavoritesTable">
   <tbody> 
      <tr valign="top" class="ms-viewheadertr"> 
         <th nowrap="nowrap" class="ms-vh"> 
            <table> 
               <tbody> 
                  <tr> 
                     <td width="100%" nowrap="nowrap" class="ms-vb">שם טבלה 
                        <img src="/_layouts/15/images/blank.gif" height="1" width="13" alt="" style="visibility: hidden;"/> </td> 
                  </tr> 
               </tbody> 
            </table> 
         </th> 
         <th nowrap="nowrap" class="ms-vh"> 
            <table> 
               <tbody> 
                  <tr> 
                     <td width="100%" nowrap="nowrap" class="ms-vb">ID 
                        <img src="/_layouts/15/images/blank.gif" height="1" width="13" alt="" style="visibility: hidden;"/> </td> 
                  </tr> 
               </tbody> 
            </table> 
         </th> 
         <th nowrap="nowrap" class="ms-vh"> 
            <table> 
               <tbody> 
                  <tr> 
                     <td width="100%" nowrap="nowrap" class="ms-vb">כותרת 
                        <img src="/_layouts/15/images/blank.gif" height="1" width="13" alt="" style="visibility: hidden;"/> </td> 
                  </tr> 
               </tbody> 
            </table> 
         </th> 
         <th nowrap="nowrap" class="ms-vh"> 
            <table> 
               <tbody> 
                  <tr> 
                     <td width="100%" nowrap="nowrap" class="ms-vb">מסמך ​ 
                        <img src="/_layouts/15/images/blank.gif" height="1" width="13" alt="" style="visibility: hidden;"/> ​​​​​​​</td> 
                  </tr> 
               </tbody> 
            </table> 
         </th> 
      </tr>
   </tbody> 
</table>​ 
<p>​​​​​​​​​</p>