Question

In order to subtract an integer from a value which is fetched using $(#id).val() I have tried:

$("#hid_count").val() = $("#hid_count").val() - 1;

and:

count = $("#hid_count").val();

Here hid_count is a hidden field on the page. However, both of these are not working. An error is coming on the page. Can anybody explain why this is?

Answer 1

$("#hid_count").val(parseInt($("#hid_count").val(), 10) - 1);

Since you are reading a string, you have to make a parseInt before arithmetic operation