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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.

参考答案

更多 “ 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. ” 相关考题
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