javascript判断文本框输入是否为空

akunamotata

于 2009-04-09 10:08:49 发布

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分类专栏： js 文章标签： JavaScript ViewUI

本文链接：https://blog.youkuaiyun.com/akunamotata/article/details/83370285

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本文介绍了一个简单的JavaScript脚本，用于验证用户注册表单。该脚本检查用户名、密码及密码确认、电子邮件地址等字段是否为空，并确保密码一致。若任一字段为空或密码不匹配，则会显示错误提示。

<script  type="text/javascript" language="javascript">
function checkValue(){
var result = true;
var username = document.registerForm.username.value;
username = username.replace(/^\s*|\s*$/g,"")   
 if(username == ""){

    result = false;   
    alert("user name should not be null!");
} else if (document.registerForm.password.value == ""){
    result = false;
    alert("password should not be null!");
 } else if (document.registerForm.passwordRepeat.value == ""){
    result = false;
    alert("password repeat should not be null!");
 } else    if(document.registerForm.passwordRepeat.value != document.registerForm.password.value){
    result = false;
    alert("password is not equal!");
 } else if(document.registerForm.email.value == ""){
    result = false;
    alert("email should not be null!");
 }
 return result;
}
</script>