Issue in displaying dynamic content in webuipopover

[renjininair]

On a button click , i need to show dynamic content in webuipopover ,based on the input values in the form.
lengthyFunction() is fetching the dynamic data based on the inputs.

On first click it is showing correct data.
When the button is clicked after changing the input values, a different result is expected.
but webuipopover shows the old data.
When the button is clicked again, it is showing correct data in webuipopover.

Please help me to ensure the visibility of popover only after completing a lengthy function call.

Eg code:
jquery(selector).webuiPopover({
closeable:true,
type:'async',
cache:false,
content: function() {
lengthyFunction();
return jquery('.className').html();
}
});