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May 19, 2017 05:42
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<!DOCTYPE html> | |
<html lang="ja"> | |
<head> | |
<meta charset="UTF-8"> | |
<title></title> | |
<style> | |
.errors { | |
color: red; | |
} | |
</style> | |
<script> | |
!function() { | |
function toArray(el) { | |
return Array.prototype.slice.call(el) | |
} | |
function h(text) { | |
var encoder = document.createElement('div') | |
encoder.appendChild(document.createTextNode(text)) | |
return encoder.innerHTML | |
} | |
function validate(form) { | |
var errors = {} | |
errors['#checkbox-group-1'] = [] | |
var checkboxItems1 = toArray(form.querySelectorAll('#checkbox-group-1 [type="checkbox"]')) | |
if (checkboxItems1.filter(function(el) { return el.checked }).length === 0) | |
errors['#checkbox-group-1'].push('not checked') | |
errors['#checkbox-group-2'] = [] | |
var checkboxItems2 = toArray(form.querySelectorAll('#checkbox-group-2 [type="checkbox"]')) | |
if (checkboxItems2.filter(function(el) { return el.checked }).length === 0) | |
errors['#checkbox-group-2'].push('not checked') | |
errors['#radio-group-1'] = [] | |
var radioItems1 = toArray(form.querySelectorAll('#radio-group-1 [type="radio"]')) | |
if (radioItems1.filter(function(el) { return el.checked }).length === 0) | |
errors['#radio-group-1'].push('not selected') | |
return errors | |
} | |
document.addEventListener('DOMContentLoaded', function() { | |
document.querySelector('#form-id').addEventListener('submit', function(e) { | |
var errors = validate(this) | |
var hasError = false | |
Object.keys(errors).forEach(function(selector) { | |
var errorContainer = document.querySelector(selector).querySelector('.errors') | |
var currentErrors = errors[selector] | |
errorContainer.innerHTML = '' | |
if (currentErrors.length > 0) { | |
hasError = true | |
currentErrors.forEach(function(error) { | |
errorContainer.innerHTML += '<div class="error">' + h(error) + '</div>' | |
}) | |
} | |
}) | |
if (hasError) | |
e.preventDefault() | |
}) | |
}) | |
}() | |
</script> | |
</head> | |
<body> | |
<form id="form-id" action=""> | |
<div id="checkbox-group-1"> | |
<label for="checkbox-id-1-1">checkbox-1-1</label> | |
<input id="checkbox-id-1-1" name="checkbox-name-1-1" type="checkbox"> | |
<label for="checkbox-id-1-2">checkbox-1-2</label> | |
<input id="checkbox-id-1-2" name="checkbox-name-1-2" type="checkbox"> | |
<label for="checkbox-id-1-3">checkbox-1-3</label> | |
<input id="checkbox-id-1-3" name="checkbox-name-1-3" type="checkbox"> | |
<div class="errors"></div> | |
</div> | |
<div id="checkbox-group-2"> | |
<label for="checkbox-id-2-1">checkbox-2-1</label> | |
<input id="checkbox-id-2-1" name="checkbox-name-2-1" type="checkbox"> | |
<label for="checkbox-id-2-2">checkbox-2-2</label> | |
<input id="checkbox-id-2-2" name="checkbox-name-2-2" type="checkbox"> | |
<label for="checkbox-id-2-3">checkbox-3-3</label> | |
<input id="checkbox-id-2-3" name="checkbox-name-2-3" type="checkbox"> | |
<div class="errors"></div> | |
</div> | |
<div id="radio-group-1"> | |
<label for="radio-id-1">radio-1</label> | |
<input id="radio-id-1" type="radio" name="radio-name-1"> | |
<label for="radio-id-2">radio-2</label> | |
<input id="radio-id-2" type="radio" name="radio-name-1"> | |
<label for="radio-id-3">radio-3</label> | |
<input id="radio-id-3" type="radio" name="radio-name-1"> | |
<div class="errors"></div> | |
</div> | |
<div> | |
<input type="submit"> | |
</div> | |
</form> | |
</body> | |
</html> |
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