Javascript alert on report with 0 records

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I have an ask the user report where they put in a date and pull up records related to it.  I was wondering if there is a way for an alert or a message appear once the date has been selected if no records are returned.  Basically can this be done with a code page to a report or is there a way through native processes.
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Posted 2 years ago

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John Thomas

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Inside a report you can see the total  records number 

$("table[qbdbid=[tableId]] tr:first").text();

[tableId] => should be your table id , remove the square brackets

once you get the string , you can search for the string "no results". if the string consist of  "no results" make a if loop and give as an alert there are no records.

I Think this will solve your problem.