YouaredevelopingaWebpage.Theusertypesacreditcardnumberintoaninputcontrolnamedccandclicksabuttonnamedsubmit.Thesubmitbuttonsendsthecreditcardnumbertotheserver.AJavaScriptlibraryincludesaCheckCreditCardfunctionthatreturnsavalueoftrueifthecreditcardappearsto
题目
YouaredevelopingaWebpage.Theusertypesacreditcardnumberintoaninputcontrolnamedccandclicksabuttonnamedsubmit.Thesubmitbuttonsendsthecreditcardnumbertotheserver.AJavaScriptlibraryincludesaCheckCreditCardfunctionthatreturnsavalueoftrueifthecreditcardappearstobevalid,basedonitschecksum.Youneedtoensurethattheformcannotbeusedtosubmitinvalidcreditcardnumberstotheserver.Whatshouldyoudo?（）
A.Configuretheinputcontroltorunontheserver.Onthesubmitbutton，addaserver-sideOnClickhandlerthatcallsCheckCreditCard and rejects the form submissioniftheinputisinvalid.
B.Ontheinputcontrol，addanonChangehandlerthatcallsCheckCreditCardandcancelstheformsubmissionwhenthe input is invalid.
C.Configuretheinputcontrolandthesubmitbuttontorunontheserver.Addasubmit_OnClickhandlerthatcallsCheckCreditCard and rejects the form submission if theinputisinvalid.
D.Ontheform，addanonSubmithandlerthatcallsCheckCreditCardandcancelstheformsubmissioniftheinput is invalid.