Can't call a JS function from a jsp file

Question

I want to invoke getInitialDropDown() (a JS function) from transactiondetails.jsp. So what I have done is,

I include the transaction.js at the end of the transactiondetails.jsp file.

<script src="<%=localrequestedURL%>resources/appjs/transaction.js" type="text/javascript"></script>

Then I invoke the getInitialDropDown() method

<script>
    $(function() {
        getInitialDropDown();
    });
</script>

But it is not working. The function getInitialDropDown() is not getting called.

Here is my transaction.js file

function getInitialDropDown() {
    alert("called");
}