PART III: APPLYING JQUERY TO YOUR WEB SITE in Java

Integration barcode 128 in Java PART III: APPLYING JQUERY TO YOUR WEB SITE
PART III: APPLYING JQUERY TO YOUR WEB SITE
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3. Create a variable called emailReg and set it equal to a regular expression for testing that the e-mail is valid and accurate.
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$( #email-submit ).bind( click , function(){ var emailReg = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/; return false; });
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4. Create a variable called email and set the value of #email-input using a selector statement.
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$( #email-submit ).bind( click , function(){ var emailReg = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/; var email = $( #email-input ).val(); return false; });
5. Add a selector statement that selects the #email-form element and inserts an error div before it. This holds all of the error messaging needed to show the error messages to the user.
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$( #email-submit ).bind( click , function(){ var emailReg = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/; var email = $( #email-input ).val(); $( #email-form ).prepend( <div class= error ></div> ); return false; });
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6. Add an else if statement that is used to test whether something has been entered when the Submit button is clicked.
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$( #email-submit ).bind( click , function(){ var emailReg = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/; var email = $( #email-input ).val(); $( #email-form ).prepend( <div class= error ></div> ); if(email == ) { } else if { } else { } return false; });
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7. In the if statement, add a selector statement to select the error div and replace it with an error element that contains text informing the user that they failed to enter an e-mail address:
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$( #email-submit ).bind( click , function(){ var emailReg = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/; var email = $( #email-input ).val(); $( #email-form ).prepend( <div class= error ></div> ); if(email == ) { $( .error ).replaceWith( <div class= error >You forgot to enter an email address.</div> );
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CHAPTER 8: CREATING ADVANCED FORMS WITH JQUERY
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} else if { } else { } return false; });
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8. In the else if statement, add a selector statement to select the error div and replace it with an error element that contains text informing the user that they failed to enter an e-mail address. The else if statement tests whether the e-mail is valid when compared with the regular expression.
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$( #email-submit ).bind( click , function(){ var emailReg = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4}) $/; var email = $( #email-input ).val(); $( #email-form ).prepend( <div class= error ></div> ); if(email == ) { $( .error ).replaceWith( <div class= error >You forgot to enter an email address.</div> ); } else if(!emailReg.test(email)) { $( .error ).replaceWith( <div class= error >Please enter a valid email address.</div> ); } else { } return false; });
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9. Finally, add an else statement that will replace the e-mail form elements with a message that informs the user that they have subscribed. This message is displayed only if the if and else if statements pass their tests.
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$( #email-submit ).bind( click , function(){ var emailReg = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4}) $/; var email = $( #email-input ).val(); $( #email-form ).prepend( <div class= error ></div> ); if(email == ) { $( .error ).replaceWith( <div class= error >You forgot to enter an email address.</div> ); } else if(!emailReg.test(email)) { $( .error ).replaceWith( <div class= error >Please enter a valid email address.</div> ); } else { $( #email-form ).html( <div class= success >Thank you, you have been subscribed.</div> ); } return false; });
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PART III: APPLYING JQUERY TO YOUR WEB SITE
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You could change the click event to a change event and bind it to the input field instead of the button if you wanted to set up a real-time validation Regular expressions can be that occurs as the user types into the input field. found all over the Web. This would require some additional coding to set Check out Table 8.1 to see up the correct message to inform the user of what a summary of some of the is required for the field and so on. more popular regular expressions used on the Add an error highlight to the e-mail input field Web today. after submitting the form if the wrong data has been entered. Use the popular regular expressions in Table 8.1 to add more fields to your form and validate different types of data.
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