使用空输入值停止提交 [英] Stop Submit With Empty Input Values

问题描述

我正在寻找一个简单的解决方案来阻止登录表单提交空输入字段。表格的代码如下。如果可能，我想使用一个简单的Javascript解决方案。

Im Looking for a simple solution to stop a login form from submitting with empty input fields. The code for the form is below. I would like to use a simple Javascript soluiton if possible.

<form id="login" method="post" action=""> 
    <input type="text" name="email" id="email" /> 
    <input type="password" name="pwd" id="pwd" /> 
    <button type="submit" id="submit">Login</button>
</form>     

如果可能，我还想更改空字段的边框。

If possible I would also like to change the border of the empty field(s).

提前致谢。

推荐答案

带有虚拟检查的示例代码：

Sample code with dummy checks:

<script type="text/javascript">
function checkForm(form) {
    var mailCheck = checkMail(form.elements['email']),
        pwdCheck = checkPwd(form.elements['pwd']);
    return mailCheck && pwdCheck;
}

function checkMail(input) {
    var check = input.value.indexOf('@') >= 0;
    input.style.borderColor = check ? 'black' : 'red';
    return check;
}

function checkPwd(input) {
    var check = input.value.length >= 5;
    input.style.borderColor = check ? 'black' : 'red';
    return check;
}
</script>

<style type="text/css">
#login input {
    border: 2px solid black;
}
</style>

<form id="login" method="post" action="" onsubmit="return checkForm(this)"> 
    <input type="text" name="email" id="email" onkeyup="checkMail(this)"/> 
    <input type="password" name="pwd" id="pwd" onkeyup="checkPwd(this)"/> 
    <button type="submit" id="submit">Login</button>
</form>

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