Question

我已经能够在用户尚未输入电子邮件时更改错误消息，但如何在用户输入错误格式的电子邮件时更改错误消息？

这是我用Bootstrap 4风格编写的代码：

<div class="form-group">
    <label>Email</label>
    <input type="email" name="email" required="" class="form-control" oninvalid="this.setCustomValidity('Please Enter valid email')" oninput="setCustomValidity('')">
</div>

Answer 1

以下是如何操作的示例：

<!DOCTYPE html>
<html>
<head>
<script>
function validateForm() {
    var x = document.forms["myForm"]["email"].value;
    var atpos = x.indexOf("@");
    var dotpos = x.lastIndexOf(".");
    if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length) {
        alert("Not a valid e-mail address");
        return false;
    }
}
</script>
</head>

<body>
<form name="myForm" action="/action_page.php" onsubmit="return validateForm();" method="post">
Email: <input type="text" name="email">
<input type="submit" value="Submit">
</form>
</body>

</html>

您必须更改alert内的文字以包含您的自定义消息，并action_page.php添加您自己的消息并添加所需的样式！

<强>更新

如果您不想实现自己的JavaScript功能，那么您可以继续向oninvalid添加条件，如下所示：

<input type="email" name="email" required="" class="form-control" oninvalid="if (this.value == ''){this.setCustomValidity('This field is required!')} if (this.value != ''){this.setCustomValidity('The email you entered is invalid!')}" oninput="setCustomValidity('')">

Answer 2

您只需在输入标签中添加标题即可解决此问题

<input type="email" class="form-control" name="email" id="freeform_email"
                        placeholder="Enter an email" required="required"
                        oninvalid="this.setCustomValidity('Enter an email that contains &quot@&quot. Example: info@roshni.nl')" title="Email: the email contains '@'. Example: info@ros-bv.nl" />

您应该这样：

<div class="form-group">
    <label>Email</label>
    <input type="email" name="email" required="" class="form-control" oninvalid="this.setCustomValidity('Please Enter valid email')"  oninput="this.setCustomValidity('')" title='<your text>'">
</div>

不客气。

如何更改默认值＆＃34;请在电子邮件地址中添加@＆＃34;？

2 个答案: