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Javascript/PHP - Get last post ID from livechat system

I am currently upgrading my livechat system to use the append function with JavaScript.
And in order to get it to work I will need to get the latest chat date or ID somehow.
So I can then do a query like:
SELECT date, message, name FROM chat WHERE id > $lastPostId";
This will then allow me to append all the latest messages instead of updating all of the HTML everytime there is a new message
So basically, my chat right now works like this:
Every second it checks for my PHP file, loadchat.php.
Loadchat.php will get every single message from the database
It then replaces all current data in my div: #chatbox by using .html() function.
And I want to change it to the append function in jquery allowing it to run a lot smoother
Because it only needs to read everything the first time and then append
So my question is, how do I get the last post ID?

Case 1:
Add one more field in your database called timestamp. When you update the chat you can store the value of last timestamp in session.Now each time fetching a new chat just send that timestamp to loadchat.php and query the db to fetch rows where timestamp > stored_timestamp.
Case 2:
You can take a flag in db like is_read. When you insert the new chat the default value of is_read will be 0. When you fetch the data just update the flag i.e is_read = 1. Now in your query you just have to check for the flag.
where is_read = 0.
It will fetch all the unread messages and will do the job.
Hope it will help!!

Google Sheets/JIRA Connection

I'm trying to connect Google Sheets to JIRA to gather the data for updating reports automatically.
I'm struggling however with a couple of points in this modified script.
I want to return the component field but calling the name field returns undefined.
var components = data["issues"][id].fields.components.name;
If I remove the name field, then I get the following response:
{name=#####, self=https://www.#########/rest/api/2/component/26357, id=26357}
The second issue is that only a handful of issues are being rendered. As far as I can see my REST call looks OK, as does the writing to tables:
var sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet(); //select active spreadsheet
sheet.getRange(2, 1, issuessss.length, 7).setValues(issuessss); // write from cell A2
break;
Anyone have any ideas that could help?

The field component is an array so components.name does not exist (i.e components[0].name would work).
Before setting the values, try to execute a flush first.

Lightswitch load all data or run a async method synchronously

I have a grid with data in Lighswitch application. Grid has on every column posibility to filter column. Thanks to lsEnhancedTable
Right now I am sending an ajax request to the web api controler with the list of ids of the Customers that I want to export. It works but with a lot of data it is very slow because I have to turn off the paging of the data to get all visible customers ids so I can iterate over the VisualCollection.
To optimize this I would have to turn on back the paging of the data to 50 records so that the initial load is fast and move the loading of the data to a save/export to excel button.
Possible solutions:
Load data all data on save button click. To do this I have to somehow load all items before I can iterate over collection.
The code bellow locks UI thread since the loadMore is async. How to load all data synchronously? Ideally I would like to have some kind of progress view using a msls.showProgress.
while(3<4)
{
if (screen.tblCustomers.canLoadMore) {
screen.tblCustomers.loadMore();
}
else
break;
}
var visibleItemsIds = msls.iterate(screen.tblCustomers.data)
.where(function (c) {
return c;
})
Second approach would be turn on paging and pass just the filters applied by the users to the web api controller so I can query database and return only filtered records. But I don't know how to do that.
Third approach is the one that I am using right now. Turn off the paging->iterate over visual collection, get the customers id, pass them to the controller and return a filtered excel. This doesn't work well when there are a lot of records.
Iterate over filtered collection in the server side? I don't know if there is a way to do this in Lighswitch?

Here's an option for client side javascript.
// First build the OData filter string.
var filter = "(FieldName eq " + msls._toODataString("value", ":String") + ")";
// Then query the database.
myapp.activeDataWorkspace.ApplicationData.[TableName].filter(filter).execute().then(function (result) { ... });

Datatable client-side data change/redraw

I set up a datatables that initially gets from server some data and represents it, but then everything is left to the client. Some options are:
serverSide: false,
sAjaxSource: mySource,
My $.fn.DataTable.version is 1.10.2.
Then I need to change, client-side, the aaData under the table because some working on data is performed. I need to update the DT to show the client-altered temporary data without send another request to server (for two reason: prevent useless traffic and because that data is being altered).
I am looking for a way to edit the underlying DT databean to edit it, so then calling again
myTable.draw();
on my table I obtain a refresh realtime without sending another get to the server.
The question is, can I access DT data array, and can I edit it?
How is it done if is possible?
EDIT: I need to feed the table the full bean array as it initially took from the server, same format. So individual row/cell add/edit and client-side building functions are not suitable in my case, unless I manually cicle all objects.

SOLUTION
Use the code below:
// Retrieve data
var data = table.ajax.json();
// Modify data
$.each(data.data, function(){
this[0] = 'John Smith';
});
// Clear table
table.clear();
// Add updated data
table.rows.add(data.data);
// Redraw table
table.draw();
DEMO
See this jsFiddle for code and demonstration.

sencha extjs data in multiple referenced grids

I have two grids getting data from php mysql backend
First grid is display of all classes in a school. This represents 1 table of mysql. And I have no issues in displaying data
second grid gets data of students in a particular class, when one clicks on any of the class of first grid. Please see image below
This is a different table in mysql. And I am "ClassID" to php file. which sends sorted JSON of students of that particular class
i use the below code
var studentView = this.getstudentGrid;
var ClassData = record.get('ClassID');
studentView.getStore().load({
params:{ClassID: ClassData}
});
but it says uncaught error and nothing gets displayed. Kindly help