[英]validation of multiple checkboxes
我有一个表格,其中我有很多问题是通过复选框给出的,现在我必须验证在复选框中包含答案的所有问题中,必须至少选中一个复选框,否则会出现警报消息,我想这样做一个单一的功能,还想知道我该如何在我的html part.so中调用该功能。
<input type="checkbox" name="question[apples]" value="1" id="apples" />
<label for="apples">Do you like apples?</label>
<input type="checkbox" name="question[shoes]" value="1" id="shoes" />
<label for="shoes">Do you like shoes?</label>
if ($('#my-form :checkbox:checked').length == 0) {
alert("You must answer at least one question');
}
if (empty($_POST['question'])) {
// Go back and pick at least one!
}
You can code your answers options in following manner, where in giving same name to the input element to represent a group of answer. 您可以按照以下方式对答案选项进行编码,即在输入元素中使用相同的名称表示一组答案。
<label><input type="checkbox" name="Question1" value="Ans1"/>Answer 1</label>
<label><input type="checkbox" name="Question1" value="Ans2"/>Answer 2</label>
<label><input type="checkbox" name="Question1" value="Ans3"/>Answer 3</label>
<label><input type="checkbox" name="Question2" value="Ans1"/>Answer 1</label>
<label><input type="checkbox" name="Question2" value="Ans2"/>Answer 2</label>
<label><input type="checkbox" name="Question2" value="Ans3"/>Answer 3</label>
Use onSubmit event to call a Javascript for validation and use validateAns (provided below) passing the question name (Question 1 or Question2 from this example) as an argument. 使用onSubmit事件来调用Java脚本进行验证,并使用validateAns(如下提供)将问题名称(此示例中的问题1或Question2)作为参数传递。
function validateAns (questionName) {
var ansInput = document.getElementsByName(questionName);
var answered = false;
for (var i = 0; i < ansInputs.length; i++) {
if (ansInput[i].checked) {
answered = true;
break;
}
}
if (!answered) {
alert('Answer question ' + questionName);
return false;
}
return true;
}
This should do the trick. 这应该可以解决问题。
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