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November 20, 2014 15:50
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Validating a form with error handling // source http://jsbin.com/fejur
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Validating a form with error handling</title> | |
| <style id="jsbin-css"> | |
| .frm-lbl {display:block;} | |
| .frm-error-strg, | |
| .frm-error-msg { | |
| color:red; | |
| display:none; | |
| } | |
| /* If label have .frm-error class show error strings */ | |
| .frm-error .frm-error-strg {display:inline;} | |
| .frm-error .frm-error-msg {display:block;} | |
| </style> | |
| </head> | |
| <body> | |
| <h1>Form Validation</h1> | |
| <form action="" id="frmExample"> | |
| <p> | |
| <label class="frm-lbl" for="name"> | |
| <span class="frm-error-strg">Error - </span> | |
| <b>Name </b> | |
| <span class="frm-error-msg"> Please indicate your name.</span> | |
| </label> | |
| <input id="name" name="name" required="required" type="text" value=""> | |
| </p> | |
| <p> | |
| <label class="frm-lbl" for="email"> | |
| <span class="frm-error-strg">Error - </span> | |
| <b>Email </b> | |
| <span class="frm-error-msg"> Well formed email please.</span> | |
| </label> | |
| <input id="email" name="email" required="required" type="text" value=""> | |
| </p> | |
| <p> | |
| <label class="frm-lbl" for="age"> | |
| <span class="frm-error-strg">Erreur - </span> | |
| <b>Âge</b> | |
| <span class="frm-error-msg"> Please indicate your age.</span> | |
| </label> | |
| <input id="age" name="age" class="yourAge lastField" required="required" type="text" value=""> | |
| </p> | |
| <p> | |
| <button type="submit">Submit</button> | |
| </p> | |
| </form> | |
| <script id="jsbin-javascript"> | |
| function validForm(formID) { | |
| var $form = document.getElementById(formID); | |
| var submitCue = false; | |
| // Show error strings | |
| function indicateError(field, error) { | |
| if(error) { | |
| field.previousElementSibling.classList.add('frm-error'); | |
| submitCue = false; | |
| } else { | |
| field.previousElementSibling.classList.remove('frm-error'); | |
| submitCue = true; | |
| } | |
| } | |
| // Validate the name | |
| function validName() { | |
| var nameField = $form.querySelector('#name'); | |
| nameField.onblur = function() { | |
| if(this.value.length < 2 || this.value.length > 25) { | |
| indicateError(this, true); | |
| return false; | |
| } else { | |
| indicateError(this, false); | |
| return true; | |
| } | |
| }; | |
| } | |
| // Validate the email | |
| function validEmail() { | |
| var emailField = $form.querySelector('#email'); | |
| var emailRegEx = /^[a-zA-Z0-9._-]+@[a-z0-9._-]{2,}\.[a-z]{2,4}$/; | |
| emailField.onblur = function() { | |
| if(!emailRegEx.test(this.value)) { | |
| indicateError(this, true); | |
| return false; | |
| } else { | |
| indicateError(this, false); | |
| return true; | |
| } | |
| }; | |
| } | |
| // Validate the age | |
| function validAge() { | |
| var ageField = $form.querySelector('#age'); | |
| ageField.onblur = function() { | |
| var age = parseInt(this.value); | |
| if(isNaN(age) || age < 5 || age > 111) { | |
| indicateError(this, true); | |
| return false; | |
| } else { | |
| indicateError(this, false); | |
| return true; | |
| } | |
| }; | |
| } | |
| if($form) { | |
| validName(); | |
| validEmail(); | |
| validAge(); | |
| $form.onsubmit = function() { | |
| if(submitCue) { | |
| alert("Sent!"); | |
| return true; | |
| } else { | |
| alert("Error!"); | |
| return false; | |
| } | |
| }; | |
| } | |
| } | |
| validForm('frmExample'); | |
| </script> | |
| <script id="jsbin-source-css" type="text/css">.frm-lbl {display:block;} | |
| .frm-error-strg, | |
| .frm-error-msg { | |
| color:red; | |
| display:none; | |
| } | |
| /* If label have .frm-error class show error strings */ | |
| .frm-error .frm-error-strg {display:inline;} | |
| .frm-error .frm-error-msg {display:block;}</script> | |
| <script id="jsbin-source-javascript" type="text/javascript"> | |
| function validForm(formID) { | |
| var $form = document.getElementById(formID); | |
| var submitCue = false; | |
| // Show error strings | |
| function indicateError(field, error) { | |
| if(error) { | |
| field.previousElementSibling.classList.add('frm-error'); | |
| submitCue = false; | |
| } else { | |
| field.previousElementSibling.classList.remove('frm-error'); | |
| submitCue = true; | |
| } | |
| } | |
| // Validate the name | |
| function validName() { | |
| var nameField = $form.querySelector('#name'); | |
| nameField.onblur = function() { | |
| if(this.value.length < 2 || this.value.length > 25) { | |
| indicateError(this, true); | |
| return false; | |
| } else { | |
| indicateError(this, false); | |
| return true; | |
| } | |
| }; | |
| } | |
| // Validate the email | |
| function validEmail() { | |
| var emailField = $form.querySelector('#email'); | |
| var emailRegEx = /^[a-zA-Z0-9._-]+@[a-z0-9._-]{2,}\.[a-z]{2,4}$/; | |
| emailField.onblur = function() { | |
| if(!emailRegEx.test(this.value)) { | |
| indicateError(this, true); | |
| return false; | |
| } else { | |
| indicateError(this, false); | |
| return true; | |
| } | |
| }; | |
| } | |
| // Validate the age | |
| function validAge() { | |
| var ageField = $form.querySelector('#age'); | |
| ageField.onblur = function() { | |
| var age = parseInt(this.value); | |
| if(isNaN(age) || age < 5 || age > 111) { | |
| indicateError(this, true); | |
| return false; | |
| } else { | |
| indicateError(this, false); | |
| return true; | |
| } | |
| }; | |
| } | |
| if($form) { | |
| validName(); | |
| validEmail(); | |
| validAge(); | |
| $form.onsubmit = function() { | |
| if(submitCue) { | |
| alert("Sent!"); | |
| return true; | |
| } else { | |
| alert("Error!"); | |
| return false; | |
| } | |
| }; | |
| } | |
| } | |
| validForm('frmExample');</script></body> | |
| </html> |
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| .frm-lbl {display:block;} | |
| .frm-error-strg, | |
| .frm-error-msg { | |
| color:red; | |
| display:none; | |
| } | |
| /* If label have .frm-error class show error strings */ | |
| .frm-error .frm-error-strg {display:inline;} | |
| .frm-error .frm-error-msg {display:block;} |
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| function validForm(formID) { | |
| var $form = document.getElementById(formID); | |
| var submitCue = false; | |
| // Show error strings | |
| function indicateError(field, error) { | |
| if(error) { | |
| field.previousElementSibling.classList.add('frm-error'); | |
| submitCue = false; | |
| } else { | |
| field.previousElementSibling.classList.remove('frm-error'); | |
| submitCue = true; | |
| } | |
| } | |
| // Validate the name | |
| function validName() { | |
| var nameField = $form.querySelector('#name'); | |
| nameField.onblur = function() { | |
| if(this.value.length < 2 || this.value.length > 25) { | |
| indicateError(this, true); | |
| return false; | |
| } else { | |
| indicateError(this, false); | |
| return true; | |
| } | |
| }; | |
| } | |
| // Validate the email | |
| function validEmail() { | |
| var emailField = $form.querySelector('#email'); | |
| var emailRegEx = /^[a-zA-Z0-9._-]+@[a-z0-9._-]{2,}\.[a-z]{2,4}$/; | |
| emailField.onblur = function() { | |
| if(!emailRegEx.test(this.value)) { | |
| indicateError(this, true); | |
| return false; | |
| } else { | |
| indicateError(this, false); | |
| return true; | |
| } | |
| }; | |
| } | |
| // Validate the age | |
| function validAge() { | |
| var ageField = $form.querySelector('#age'); | |
| ageField.onblur = function() { | |
| var age = parseInt(this.value); | |
| if(isNaN(age) || age < 5 || age > 111) { | |
| indicateError(this, true); | |
| return false; | |
| } else { | |
| indicateError(this, false); | |
| return true; | |
| } | |
| }; | |
| } | |
| if($form) { | |
| validName(); | |
| validEmail(); | |
| validAge(); | |
| $form.onsubmit = function() { | |
| if(submitCue) { | |
| alert("Sent!"); | |
| return true; | |
| } else { | |
| alert("Error!"); | |
| return false; | |
| } | |
| }; | |
| } | |
| } | |
| validForm('frmExample'); |
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