I assume that you are trying to access JSONP data. Probably you need to add? Callback =? to your url
var url="http://www.somedata.com";
$.getJSON(url+'?callback=?', function(json){
$.each(json.people,function(i,dat){
$("#todaycal").append("<li>"+dat.name+" "+dat.caseNo+"</li>");
});
$("#todaycal").listview('refresh');
});
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