Event application in jquery text box takes input email as an example_jquery

Event application in the text box: Take the input email as an example, as shown in the figure: The code is as follows:

Copy the code The code is as follows: body{ font-size:13px;} /*Element initialization style*/ .divInit{ width:390px; height:55px; line-height:55px; padding-left:20px;} .txtInit{ border:solid 1px #666; padding:3px; background-image:url( 'Images/bg_email_input.gif');} .spnInit{ width:179px; height:40px; line-height:40px; float:right; margin-top:8px; padding-left:10px; background-repeat: no-repeat;} /*Element loses focus style*/ .divBlur{ background-color:#FEEEC2;} .txtBlur{ border:solid 1px #666; padding:3px; background-image :url('Images/bg_email_input2.gif');} .spnBlur{ background-image:url('Images/bg_email_wrong.gif');} .divFocu{ background-color:#EDFFD5;} / *div gets focus style*/ .spnSucc{ background-image:url('Images/pic_Email_ok.gif'); margin-top:20px;} /*span style when verification is successful*/ $(function () { $(" #txtEmail").trigger("focus"); //The text box gets focus by default $("#txtEmail").focus(function () { //The text box gets focus event $(this ).removeClass("txtBlur").addClass("txtInit"); $("#email").removeClass("divBlur").addClass("divFocu"); $("#spnTip" ).removeClass("spnBlur").removeClass("spnSucc").html("Please enter your usual email address! "); }); $("#txtEmail").blur(function () { //Text box loses focus event var vTxt = $("#txtEmail").val() ; if (vTxt.length == 0) { //Whether the email address is entered in the text box $(this).removeClass("txtInit").addClass("txtBlur"); $( "# email").removeClass("divFocu").addClass("divBlur"); $("#spnTip").addClass("spnBlur").html("Email address cannot be empty!"); } else { //Check whether the email format is correct if (!chkEmail(vTxt)) { //If it is incorrect $(this).removeClass("txtInit").addClass( "txtBlur"); $("#email").removeClass("divFocu").addClass("divBlur"); $("#spnTip").addClass("spnBlur").html( "The email format is incorrect!"); } else { //If correct $(this).removeClass("txtBlur").addClass("txtInit"); $(" #email").removeClass("divFocu"); $("#spnTip").removeClass("spnBlur").addClass("spnSucc").html(""); } } }); /*Verify whether the email format is correct. Parameter strEmail, the email that needs to be verified*/ function chkEmail(strEmail) { var vChk = /^w ([- .]w )*@w ([-.]w )*.w ([-.]w )*$/; if (!vChk.test(strEmail)) { return false; } else { return true; } } }); Email: