View sharepoint list last modified date using javascript

Question

I have some code that I used to get my SP2010 task list last modified date using SP designer but doesn't seem to work and I tried to step through it with firebug but not really sure where my problem is and I am not getting an output it seems like. I also am not sure if I need a column just for Last modified date or not, I do not have that.

I tried this code here:

var ctx = SP.ClientContext.get_current();
var web = ctx.get_web();
var lists = web.get_lists();
var list = lists.getByTitle("Task2BeCompleted");
ctx.load(list, "LastItemModifiedDate");
ctx.executeQueryAsync(
    function() {
        var lastmodified = list.get_lastItemModifiedDate();
    },
    function() {}
);

Tried to use firebug but not sure where to look for my response, used console.log and still not seeing my answer. I even tried using an alert to display my date but I think that the problem is with my function.

Don't have much experience with javascript or with developing for SP2010 so please any help would be really appreciated!

Answer 1

You should use caml query to retrieve 1 item with the latest modified date:

var _listItems;
ExecuteOrDelayUntilScriptLoaded(function () {
    var ctx = SP.ClientContext.get_current();
    var web = ctx.get_web();
    var lists = web.get_lists();
    var list = lists.getByTitle("Task2BeCompleted");
    ctx.load(list, "LastItemModifiedDate");

var query = new SP.CamlQuery();
  var rowlimit = "<RowLimit>" + itemAmount + "</RowLimit>";
  var orderByDesc = "<OrderBy><FieldRef Name='Modified'  Ascending='FALSE' /></OrderBy>";
  query.set_viewXml("<View><Query>" + orderByDesc + "</Query>" + rowlimit + "</View>");
        _listItems = list.getItems(query);
        ctx.load(_listItems);
  ctx.executeQueryAsync(
        function () {


       if(_listItems.get_count() > 0)
       {
         var latestItem = _listItems.get_item(0);
         var latestDate = latestItem.get_item("Modified");
        }
        },
        function () {
        }
    );
}, "sp.js");

Answer 2

I guess "sp.js" might be not loaded. you can try this:

ExecuteOrDelayUntilScriptLoaded(function () {
    var ctx = SP.ClientContext.get_current();
    var web = ctx.get_web();
    var lists = web.get_lists();
    var list = lists.getByTitle("Task2BeCompleted");
    ctx.load(list, "LastItemModifiedDate");
    ctx.executeQueryAsync(
        function () {
            var lastmodified = list.get_lastItemModifiedDate();
        },
        function () {
        }
    );
}, "sp.js");

Hope it's helpful.

Answer 3

you place below code in content editor webpart and check

 <script type="text/javascript">
ExecuteOrDelayUntilScriptLoaded(Initializeall, 'sp.js');
 function Initializeall()
{
 alert("hi");
 var ctx = SP.ClientContext.get_current();
 var web = ctx.get_web();
 var lists = web.get_lists();
 var list = lists.getByTitle("Sample");
ctx.load(list, "LastItemModifiedDate");
ctx.executeQueryAsync(
function() {
alert("inside");
    var lastmodified = list.get_lastItemModifiedDate();
alert(lastmodified);
},
function() {}
);
}
     </script>

Answer 4

The code that you've provided for retrieving LastItemModifiedDate property is correct from functional perspective.

How to identify the error?

First option, print error details.

Please replace Failed callback in SP.ClientContext.executeQueryAsync method in order to display the actual error:

ctx.executeQueryAsync(
    function() {
        var lastmodified = list.get_lastItemModifiedDate();
    },
    function(sender,args) {
      alert('Request failed. ' + args.get_message() + 
        '\n' + args.get_stackTrace());
    }
);

Second option, debug CSOM (JavaScript) application (with IE).

Follow the article Using the F12 Developer Tools to Debug JavaScript Errors to find out how to debug (JavaScript) application and Debugging Script with the Developer Tools

IE Developer Tools