jsp - prevent double form submit with javascript on h:commandLink in jsf under jdk 8 -

we have jsf/tomcat/hibernate/oracle application upgrade java 8. develop using eclipse. upon upgrading java 8 (jdk 8) upgrading eclipse luna , tomcat 7.0.54 have experienced 2 issues. less serious 1 of graphical renderings have new not before. more serious issue have double form submission prevention script causing our h:commandlink components hang up. after clicking on such link, url gets appended #, , subsequent clicks on link (or other buttons on page) show our alert "already submitted - please wait..." comes our script. our script is:

// prevent double form submissions var defaultsubmit = null; var formsubmitted = false;  function initform() {     if (defaultsubmit == null) {         defaultsubmit = document.forms[0].submit;         document.forms[0].submit = submitform;         document.forms[0].onsubmit = checkformsubmission;     }     formsubmitted = false; } function checkformsubmission() {     if (formsubmitted) {         alert('already submitted - please wait...');         return false;     } else {         formsubmitted = true;         return true;     } } function submitform() {     if (checkformsubmission()) {         if (defaultsubmit != null) {             return defaultsubmit();         }     }     return false; }  </script> 

the above script part of jsp file gets included in many other jsp files within our application. worked using jdk 5, 6 , 7 has problems now. h:commandbutton's work ok, h:commandlink's cause application hang described above. how can fixed work jdk 8?

an online search use of onsubmit h:commandlink indicated onclick better choice, , allowed solution our primary problem. first, needed replace "h:commandlink ..." "h:commandlink onclick="return checkformsubmission();" ... everywhere within program. our script needed replaced new script:

var initialized = false; var formsubmitted = false;  function initform() {     if (initialized == false) {         document.forms[0].onsubmit = checkformsubmission;         initialized = true; }     formsubmitted = false; } function checkformsubmission() {     if (formsubmitted) {         alert('already submitted - please wait...');         return false;     } else {         formsubmitted = true;         return true;     } } 

when of above changes made, our double click protection once again works desired. once click made on either h:commandlink or h:commandbutton, subsequent click pops alert telling user: "already submitted - please wait...", , alert appears no matter h:commandlink or h:commandbutton subsequently pressed. our desired behavior.