Cognos 8- Java Script for Date Validation

If data range needs to be passed for any Report studio report, 2 date prompts are required.
If user should not be allowed to 'Run' the report if period begin date is greater than period end date, then follow below listed steps.

Steps-

1. Give name 'txt_o_b_dt' to the date prompt which belong to period begin date.
(Shown in italics in below java script)

2. Give name 'txt_o_e_dt' to the date prompt which belong to period end date.
(Shown in italics in below java script)

3. Drag an HTML item to the footer of the prompt page.

4. Paste below java script in to that.


var bgn_dt= new Date(document.formWarpRequest.txtDatetxt_o_b_dt.value);

var end_dt= new Date(document.formWarpRequest.txtDatetxt_o_e_dt.value);

if (bgn_dt>end_dt)

alert("End date should be greater than Begin date.");

else
{
promptButtonFinish();
}

Here values from the date prompts(those are of string type) are converted into date type and stored in 2 variables- bgn_dt and end_dt.

If bgn_dt>end_dt and user clicks on Finish or Next button, he will get a message box saying that selection is wrong.

Only after making right selection he will be allowed to run the report or move to the next page.