为什么我的 Java 脚本代码不是 运行? (表单验证)

Why is my Java script code not running? (Form Validation)

这是我的HTML:

<html>

<head>

    <title>Article</title>
    <link rel="stylesheet" href="pop.css" type="text/css" />
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>

<body>
    <script type="text/javascript" src="validator.js"></script>
    <div id="comment_form">

        <form method="POST">
            Name:
            <input type="text" name="name" id="name1" onblur="checkname()">
            <br/> Email:
            <input type="text" name="email" id="email1" onblur="checkemail()">
            <br/>
            <br/> Comment:
            <br/>
            <textarea name="comment" id="comment1" cols="50" rows="2" onblur="checkcomment()"></textarea>
            <br/>
            <input type="submit" value="comment" onsubmit="validateform()">

        </form>
</body>

</html>

这是我的Javascript:

function checkname() {
    alert("Isee ur java script");
    var myName = document.getElementById("name1");

    var pos = myName.value.search(/^[A-Z][a-z] $/);
    if (pos != 0) {
        alert("Please Enter a Valid name. It should not contain numbers.");
        retrun false;
    } else
        return true
}


function checkemail() {
    var myEmail = document.getElementById("email1");

    var pos = myEmail.value.search(/^[a-z]+-?\.?_?@[a-z]+\.[a-z]+$/);
    if (pos != 0) {
        alert("Please Enter a Valid Email Address. eg. youremail@hotmail.com");
        retrun false;
    } else
        return true
}

function checkcomment() {
    var myComment = document.getElementById("comment1");
    if (myComment == null || myComment == "") {
        alert("Please add a comment.");
        return false;
    }
}

function validateform() {
    if (myName == null || myName == "" || myEmail == null || myEmail == "" || myComment = null || myComment == "") {
        alert("Please fill out all of the fields!");
    }
}

它根本不起作用,即使我尝试在其中一个功能中发出警告,它也没有出现。我还尝试在 validator.js 中添加它而不是在 HTML 中调用事件,但它仍然无法正常工作。

document.getElementById("name").onblur = checkname;
document.getElementById("email").onblur = checkemail;
document.getElementById("comment").onblur = checkcomment;

而不是使用 if (myComment == "") 使用 if (myComment.value == "") 你的代码有很多错误,你的一些变量是 undefined

在浏览器中按 F12 并打开“控制台”选项卡。这将向您显示 Javascript.

中的所有语法错误

已调试。在 JSFiddle 中它仍然无法正常工作,但至少你的 JavaScript 中没有错误了。在 JSBin 中试过:--->http://jsbin.com/vabewefubi/1/edit?html,js,output

    function checkname() {
    alert("Isee ur java script");
    var myName = document.getElementById("name1");

    var pos = myName.value.search(/^[A-Z][a-z] $/);
    if (pos !== 0) { //!== old: !=
        alert("Please Enter a Valid name. It should not contain numbers.");
        return false; //return old: retrun
    } else
        return true; //missing semicolon
}


function checkemail() {
    var myEmail = document.getElementById("email1");

    var pos = myEmail.value.search(/^[a-z]+-?\.?_?@[a-z]+\.[a-z]+$/);
    if (pos !== 0) { //!== old: !=
        alert("Please Enter a Valid Email Address. eg. youremail@hotmail.com");
        return false; //return old: retrun
    } else
        return true; //missing semicolon
}

function checkcomment() {
    var myComment = document.getElementById("comment1");
    if (myComment === null || myComment === "") { //=== old: ==
        alert("Please add a comment.");
        return false;
    }
}

function validateform() {
    if (myName === null || myName === "" || myEmail === null || myEmail === "" || myComment === null || myComment === "") { //=== old: ==
        alert("Please fill out all of the fields!");
    }
}