在提交表单之前，如何要求至少选中一个复选框? [英] How can I require at least one checkbox be checked before a form can be submitted?
本文介绍了在提交表单之前，如何要求至少选中一个复选框?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个包含多个复选框的列表.用户可以检查所有这些，但至少应该检查一个以允许表单提交.我如何执行该要求?
I have a list of multiple check boxes. The user can check all of them, but at least one should be checked to allow form submission. How can I enforce that requirement?
<p>Box Set 1</p>
<ul>
<li><input name="BoxSelect[]" type="checkbox" value="Box 1" required><label>Box 1</label></li>
<li><input name="BoxSelect[]" type="checkbox" value="Box 2" required><label>Box 2</label></li>
<li><input name="BoxSelect[]" type="checkbox" value="Box 3" required><label>Box 3</label></li>
<li><input name="BoxSelect[]" type="checkbox" value="Box 4" required><label>Box 4</label></li>
</ul>
<p>Box Set 2</p>
<ul>
<li><input name="BoxSelect[]" type="checkbox" value="Box 5" required><label>Box 5</label></li>
<li><input name="BoxSelect[]" type="checkbox" value="Box 6" required><label>Box 6</label></li>
<li><input name="BoxSelect[]" type="checkbox" value="Box 7" required><label>Box 7</label></li>
<li><input name="BoxSelect[]" type="checkbox" value="Box 8" required><label>Box 8</label></li>
</ul>
<p>Box Set 3</p>
<ul>
<li><input name="BoxSelect[]" type="checkbox" value="Box 9" required><label>Box 9</label></li>
</ul>
<p>Box Set 4</p>
<ul>
<li><input name="BoxSelect[]" type="checkbox" value="Box 10" required><label>Box 10</label></li>
</ul>
推荐答案
这是一个使用 jquery 和您的 html 的示例.
Here's an example using jquery and your html.
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
</head>
<body>
<script type="text/javascript">
$(document).ready(function () {
$('#checkBtn').click(function() {
checked = $("input[type=checkbox]:checked").length;
if(!checked) {
alert("You must check at least one checkbox.");
return false;
}
});
});
</script>
<p>Box Set 1</p>
<ul>
<li><input name="BoxSelect[]" type="checkbox" value="Box 1" required><label>Box 1</label></li>
<li><input name="BoxSelect[]" type="checkbox" value="Box 2" required><label>Box 2</label></li>
<li><input name="BoxSelect[]" type="checkbox" value="Box 3" required><label>Box 3</label></li>
<li><input name="BoxSelect[]" type="checkbox" value="Box 4" required><label>Box 4</label></li>
</ul>
<p>Box Set 2</p>
<ul>
<li><input name="BoxSelect[]" type="checkbox" value="Box 5" required><label>Box 5</label></li>
<li><input name="BoxSelect[]" type="checkbox" value="Box 6" required><label>Box 6</label></li>
<li><input name="BoxSelect[]" type="checkbox" value="Box 7" required><label>Box 7</label></li>
<li><input name="BoxSelect[]" type="checkbox" value="Box 8" required><label>Box 8</label></li>
</ul>
<p>Box Set 3</p>
<ul>
<li><input name="BoxSelect[]" type="checkbox" value="Box 9" required><label>Box 9</label></li>
</ul>
<p>Box Set 4</p>
<ul>
<li><input name="BoxSelect[]" type="checkbox" value="Box 10" required><label>Box 10</label></li>
</ul>
<input type="button" value="Test Required" id="checkBtn">
</body>
</html>
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