Using JSON variable in jQuery dynamically

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I have two DIVs, #placeholder AND #imageLoad. When the user clicks on a particular thumb its larger version (thumb2) should then appear in #imageLoad DIV.

Here is the jQuery that needs to be fixed:

  $.getJSON('jsonFile.json', function(data) {
        var output="<ul>";
        for (var i in data.items) {
            output+="<li><img src=images/items/" + data.items[i].thumb + ".jpg></li>";
        }
        output+="</ul>";
        document.getElementById("placeholder").innerHTML=output;
  });

  //This is wrong!! Not working..
  $('li').on({
         mouseenter: function() {
             document.getElementById("imageLoad").innerHTML="<img src=images/items/" +
             data.items[i].thumb2 + ".jpg>";
         }
  });

Here is the external JSON file below (jsonFile.json):

{"items":[
    {
        "id":"1",
        "thumb":"01_sm",
        "thumb2":"01_md"
    },
    {
        "id":"2",
        "thumb":"02_sm",
        "thumb2":"02_md"
    }
]}


$.getJSON('jsonFile.json', function(data) {
    var output="<ul>";
    for (var i = 0; i < data.items.length; i++) {
        output += "<li><img thumb2='" + data.items[i].thumb2 + "' src='images/items/" + data.items[i].thumb + ".jpg'></li>";
    }
    output += "</ul>";
    $("#placeholder").html(output);

    $('li').on({
        mouseenter: function() {
            $("#imageLoad").html("<img src='images/items/" + $(this).find('img').attr('thumb2') + ".jpg'>");
        }
    });
});