what g_form.getControl('fieldname')&g_form.getValue(variables.fieldname) can do?

[chenyanwei]

the fieldname are both reference type in catalog item .

g_form.getControl('fieldname') returned a:

what dose this mean? and what does it can do?

and   g_form.getValue(variables.fieldname) did not return anything when I alert it, why not just use g_form.getValue('fieldname')?

[Shishir Srivast]

instead you can try like, for example:

if(approver_name != null || approver_name != '')

[Kunal Jha]

Chen - if getcontrol gives you the html output and getValue gives you field value then if you assign these to some variable then how will you get Boolean as output .

So as rules of law states what is assigned is what you get.