Created
February 16, 2012 17:19
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JS Validation function
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| <html> | |
| <head> | |
| <title>js validate</title> | |
| </head> | |
| <body> | |
| <form id="loginform" method="post" action="#" onsubmit="return validateFields(this)"> | |
| <div> | |
| <label class="labelarea">Customer Num:</label> | |
| <input id="custninputID" type="text" name="custninput" class="inputarea" onblur="validateFields(this)" data-validate='{"pattern":"/^\\d{4}$/"}' data-error='{"empty":"Please enter something in the customer number input.", "pattern":"Customer number must be 4 digits!"}' /><br /> | |
| <span id="custninputID-info"></span><br /> | |
| <label class="labelarea">Password:</label> | |
| <input name="passwordinput" id="passwordinputID" type="password" class="inputarea" onblur="validateFields(this)" data-validate data-error='{"empty":"Please enter something in the password input."}' /><br /> | |
| <span id="passwordinputID-info"></span><br /> | |
| <input type="submit" name="submitted" value="Log In" id="submit" /> | |
| </div> | |
| </form> | |
| <script src="validate.js" type="text/javascript"></script> | |
| </body> | |
| </html> |
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| function validateFields(el) | |
| { | |
| var valid = true, | |
| validField = true, | |
| fields = (el.nodeName === 'FORM') ? el.getElementsByTagName('input') : [el], | |
| i = fields.length; | |
| while( --i + 1 ) | |
| { | |
| var field = fields[i], | |
| type = field.getAttribute('type'); | |
| if( type !== 'text' && type !== 'password' ) | |
| continue; | |
| var validate = field.getAttribute('data-validate'); | |
| if( validate === null ) | |
| continue; | |
| var error = field.getAttribute('data-error'), | |
| id = field.getAttribute('id'), | |
| info = document.getElementById(id + '-info'), | |
| value = field.value, | |
| regex; | |
| /* JSON support: Internet Explorer 8+, Firefox 3.1+, Safari 4+, Chrome 3+, and Opera 10.5+ */ | |
| validate = (validate) ? JSON.parse(field.getAttribute('data-validate')) : {}; | |
| validate.req = (validate.req === 'false') ? false : true; | |
| error = (error) ? JSON.parse(error) : {}; | |
| if( !value ) | |
| { | |
| if( validate.req == true ) | |
| { | |
| validField = false; | |
| if( error.empty ) | |
| { | |
| info.innerHTML = error.empty; | |
| } | |
| } | |
| } | |
| else | |
| { | |
| if( validate.pattern ) | |
| { | |
| regex = validate.pattern.split('/', 3); | |
| if( !RegExp(regex[1], regex[2]).test(value) ) | |
| { | |
| validField = false; | |
| if( error.pattern ) | |
| { | |
| info.innerHTML = error.pattern; | |
| } | |
| } | |
| } | |
| } | |
| if( !validField ) | |
| { | |
| if( field.className.search('error') === -1 ) | |
| { | |
| field.className += ' error' ; | |
| } | |
| valid = false; | |
| } | |
| else | |
| { | |
| field.className = field.className.replace(' error', ''); | |
| info.innerHTML = ''; | |
| } | |
| } | |
| return valid; | |
| } |
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