jQuery检查输入.val()是否包含某些字符 [英] Jquery check if input .val() contains certain characters

问题描述

我需要检查页面上的输入字段是否包含字符.

I need to check if an input field on my page contains characters.

这是用于非常基本的电子邮件地址验证，因此我只想检查文本是否为空，并且包含@和.字符.

This is for very basic email address validation so I only want to check if the text is not empty, and contains @ and . characters.

我一直在尝试这种方式:

I've been trying this way:

if (($("." + parentname.attr("class") + " #email").val().contains("@")) && ($("." + parentname.attr("class") + " #email").val().contains(".")))
{
    email = 1;
}

假定值为[e-mail]，此代码将引发以下错误:

Assuming a value of [e-mail], this code will throw the following error:

对象[e-mail]没有方法包含"

Object [e-mail] has no method 'contains'

因此，我进行了一些研究，发现.contains适用于DOM对象，而不是建议使用此字符串的字符串:

So I did some research and found that .contains is for DOM objects, not strings with a suggestion to try this:

if (($("." + parentname.attr("class") + " #email").val().IndexOf("@") != -1) && ($("." + parentname.attr("class") + " #email").val().IndexOf(".") != -1))
{
    email = 1;
}

会导致类似的错误:

对象[e-mail]没有方法'IndexOf'

Object [e-mail] has no method 'IndexOf'

我在这里基本上没有主意，特别是考虑到以下代码可以在我创建的另一个站点中正常运行:

I'm basically out of ideas here especially considering that the following code works as I want it to in another site I've made:

if ($("#contact-email").val().contains("yahoo.com")) {
    $(".errmsg").text("Domain yahoo.com has been banned due to excessive spam, please use another domain.");
}

有人可以建议我尝试做其他事情吗?或者，更好的方法是如何正确地做到这一点?

Can anyone suggest any other things I could try or, better yet, how to do this properly?

推荐答案

indexOf开始时不使用大写字母 I .尝试以下方法:

indexOf does not use a capital I at the start. Try this instead:

if (($("." + parentname.attr("class") + " #email").val().indexOf("@") != -1) && ($("." + parentname.attr("class") + " #email").val().indexOf(".") != -1))
{
  email = 1;
}

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