i am getting an error getElementsByClassName(). how can i resolve it?

[asha4]

i am getting an error getElementsByClassName(). how can i resolve it?

for getting the attachments length i have used this method 

[Ruhi Jibhyenka1]

Hi Asha,

Try this example and make necessary changes(like field name & table name) -

function onSubmit() {

    //Type appropriate comment here, and begin script below

var cat_id = gel('sysparm_item_guid').value;

var rowcount=0;

var s = g_form.getValue('si');

if((s == "Attach a file"))

{

var attachment = new GlideRecord("sys_attachment");

attachment.addQuery("table_name", "change_request");

attachment.addQuery("table_sys_id", cat_id);

attachment.query();

while (attachment.next()) {

rowcount++;

}

if(rowcount == 2)

{

return true;

}

else

{

alert("Please attach 2 attachments ");

return false;   }

}