这一节和之前教的有点脱节了吧老师只顾着自己演示了

来源：4-15 编程练习

whiteDive

2018-12-19 23:52:05

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        .oneline {
            line-height: 1.5;
            margin: 10px auto;
        }

        .oneline label {
            width: 100px;
            text-indent: 15px;
            font-size: 14px;
            font-family: "Microsoft Yahei";
            display: inline-block;
        }

        .oneline .sinput {
            width: 60%;
            height: 30px;
            border-radius: 6px;
            border: 1px solid #e2e2e2;
        }

        .oneline input[type="submit"] {
            margin-left: 20px;
            width: 80px;
            height: 30px;
            border: 0;
            background-color: #5899d0;
            color: #fff;
            font-size: 14px;
            border-radius: 6px;
        }

        .error-messages {
            color: red;
        }
    </style>
</head>
<body>
<form id="forms">
    <div class="oneline">
        <label for="name">用户名:</label>
        <input id="name" class="sinput" name="name" type="text" required>
    </div>
    <div class="oneline">
        <label for="email">Email:</label>
        <input id="email" class="sinput" name="email" type="email" required>
    </div>
    <div class="oneline">
        <input type="submit" id="submits" value="提交">
    </div>
</form>
<script>
    function replaceValidationUI(form) {
        form.addEventListener("invalid", function(event) {
            event.preventDefault();
        }, true);
        form.addEventListener("submit", function(event) {
            if (!this.checkValidity()) {
                event.preventDefault();
            }
        });
        //此处写代码
        var sunmitBtn=document.getElementById("submits");
        sunmitBtn.addEventListener("click", function (event) {
            var allField=form.querySelectorAll(":invalid"),
                errorMessage=form.querySelectorAll(".error-messages"),
                forms=document.getElementById("forms");
            for(var i=0;i<errorMessage.length;i++){
                errorMessage[i].parentNode.removeChild(errorMessage[i]);
            }
            for(var i=0;i<allField.length;i++){
                forms.insertAdjacentHTML("afterbegin","<div class='error-messages'>"+allField[i].validationMessage+"</div>")

            }
        });
        if (invalidFields.length > 0) {
            invalidFields[0].focus();
        }
    }
    var forms = document.getElementById("forms");
    replaceValidationUI(forms);
</script>
</body>

</html>

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