检查输入字段是否包含特定文本 [英] Check if input fields contains certain text

问题描述

我正在尝试查找用户输入到输入字段的内容是否包含某些文本 - 我有点工作，但只能用于完全匹配而不是部分匹配。如果用户在我匹配的文本之前键入任何内容，当然代码不会触发。

I'm trying to find if what the user typing in to an input field contain certain text - I've kinda got it works, but only working for an exact match as opposed to a partial match. If a user types anything before the text i'm matching, of course the code doesn't trigger.

我需要做的是检查输入是否包含<$输入字段中的所有c $ c> @ nyu.edu 。

What i need to do is check if the input contains @nyu.edu at all in the input field.

$('.email').keyup(function(){
    if ($(".email").val() == "@nyu.edu") {
        $("p.warning").css("visibility", "visible");
    }
    else if ($(".email").val() != "@nyu.edu") {
        $("p.warning").css("visibility", "hidden");
    }
});

推荐答案

检查字符串是否包含子字符串非常容易通过 haystack.indexOf（针）并检查 -1 （未找到）。

Checking if a string contains a substring is pretty easily done by taking haystack.indexOf(needle) and checking against -1 (not found).

if ($(".email").val().indexOf("@nyu.edu") !== -1) {
    // contains
} else {
    // does not contain
}

---

ES6 草案中有一个功能，您可能会发现它更自然，称为包括

---

There is a function in the ES6 draft which you may find more natural, called includes

您可以添加对 ES6的支持 String.prototype.includes 这样的

You can add support for ES6's String.prototype.includes like this

if (!String.prototype.includes) {
    String.prototype.includes = function (needle, pos) {
        return this.indexOf(needle, pos || 0) !== -1;
    };
}

"foobar".includes('foo'); // true

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