javascript - 最小长度输入字段验证 - JQuery

Question

我有下面的 JQuery 验证，只是确保在输入字段中写入了一些内容，我在 html 中也有 maxlength。

但是，我希望有人能阐明这种情况，并告诉我如何将某种类型的最小长度添加到下面的 jquery 代码中，这样我就不需要执行任何其他功能了？

 $('#form1').submit(function (e) {
    e.preventDefault();
}).validate({
    rules: {
        txtusername: {
            required: true
        },
        txtfirstname: {
            required: true
        },
        txtemail: {
            required: true
        },
        txtpassword: {
            required: true
        },
        passwordconfirm: {
            required: true
        }
    },
    messages: {
        txtusername: {
            required: "Please enter your Username."
        },
        txtfirstname: {
            required: "Please enter your First Name."
        },
        txtemail: {
            required: "Please enter your Email."
        },
        txtpassword: {
            required: "Please enter your Password."
        },
        passwordconfirm: {
            required: "Please enter your password again."
        }
    },
    errorPlacement: function (error, element) {
        error.appendTo(element.parent().prev());
    },
    submitHandler: function (form, user) {

        CheckUser(form);
        return false;
    }
});

示例 HTML -

<div data-role="fieldcontainer">
            <label for="txtusername" data-theme="d">Username:</label>
            <input type="text" id="txtusername" name="txtusername" maxlength="12"  placeholder="Enter Username"/>
        </div>

Answer 1

你可以像下面这样使用:

rules:{
    txtusername: {
        required: true,
        minlength: 3
    },
}