how can i get a value from inside a function using java script?

Question

here is the function from inside a script

function dosubmit()
  {
    if (getObj("Frm_Username").value == "")
    {
      getObj("errmsg").innerHTML = "Username cannot be empty.";
      getObj("myLayer").style.visibility = "visible" ;
      return;
    }
    else
    {
      getObj("LoginId").disabled = true;
      getObj("Frm_Logintoken").value = "3";
      document.fLogin.submit();
    }
  }

i want to get the value of getObj("Frm_Logintoken") as i can't pull the value from #Frm_Logintoken

using document.getElementById("#Frm_Logintoken") this gives me null

because Frm_Logintoken only gets it's value when i click submit .

<input type="hidden" name="Frm_Logintoken" id="Frm_Logintoken" value="">

full page code

i found this online /getObj\("Frm_Logintoken"\).value = "(.*)";/g but when i run it ... it gives me the same line again ! it's full code https://hastebin.com/gurosatuna.xml

What do you want to do with the value and more importantly, **when**? — Phil, Jun 07 '19 at 03:24
try `document.getElementById("Frm_Logintoken")` without the number sign — Paulo Castro, Jun 07 '19 at 03:25
_"number sign"_, also known as _"pound sign"_ or _"hash"_ (or _"sharp"_ if you're into musical notation) — Phil, Jun 07 '19 at 03:28
it gave me this `` ........ the value is used to login into the page . using php to curl [link](https://pastebin.com/9gAaR516) .. i still want to convert this code to javascript ... when to use it ? after i get the value of the token. — mina nageh, Jun 07 '19 at 03:31
@Phil i have searched google with the id frashnum ... and found this code in a forum ... would it help ? [link](https://pastebin.com/n6H4SKXP) i have posted the link inside a pastbin cause it said something about pages that breaks fast and refused to post it . — mina nageh, Jun 07 '19 at 03:51
what does this even mean ? `/getObj\("Frm_Logintoken"\).value = "(.*)";/g` when i run it ... it gives me the line again ! — mina nageh, Jun 07 '19 at 03:55
have you tried with.val() or .text() or .InnerHTML() to see what value these give you. — Toxide82, Jun 07 '19 at 14:09
aren't them all are the same ... .InnerHTML() gives me "" and the others i don't know there full command but i think they will return the same value . — mina nageh, Jun 07 '19 at 14:20
hi would this help ? https://gist.github.com/ali-essam/80b58ea170051a96108b5f320754564f — mina nageh, Jun 07 '19 at 17:23

score 0 · Answer 1 · answered Jun 07 '19 at 14:15

First:

Your checking if a value is empty with JS. However this is NOT needed as HTML does this for you. Add a attribute required and the form will not submit as long this value is empty

Documentation: https://www.w3schools.com/tags/att_input_required.asp

Second:

You could use the event handler 'on submit'. The code is not complete enough to know if u did this but I suppose you just added a Click handler on the button.

Documentation: https://www.w3schools.com/jsref/event_onsubmit.asp

When combining these two, you always have a username filled in and the code only executes when submitted. I hope this helps, if not please leave a comment and I will edit this answer.

EDIT: the answer on this SO will also help (not the checked on but the one below)

How can I listen to the form submit event in javascript?

"Add a attribute required and the form will not submit as long this value is empty" it's already there !! but document.fLogin.submit(); refreshes the page and there is a lock after 3 wrong tries ... and it's not just like clicking the button as it just shows the pop up of Username cannot be empty. .... about the second part i don't own the code it's an already written code so i don't know if editing the code after the page loads helps ... — mina nageh, Jun 07 '19 at 15:36
hi would this help ? https://gist.github.com/ali-essam/80b58ea170051a96108b5f320754564f — mina nageh, Jun 07 '19 at 17:23

how can i get a value from inside a function using java script?

1 Answers1