在没有validate-plugin的情况下使用jQuery验证网址? [英] Validating url with jQuery without the validate-plugin?

问题描述

我需要使用jQuery验证变量中的网址，但不能使用validate-plugin.有没有简单的方法可以做到这一点?

I need to validate a url in variable with jQuery, but can't use validate-plugin. Is there a simple way to do this?

推荐答案

您可以使用与验证插件相同的正则表达式(已于2015年5月23日更新为最新的正则表达式):

You can use the same regex that the validation plugin does (updated to latest regex on May 23rd, 2015):

function isUrlValid(url) {
    return /^(https?|s?ftp):\/\/(((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:)*@)?(((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]))|((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?)(:\d*)?)(\/((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)+(\/(([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)*)*)?)?(\?((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|[\uE000-\uF8FF]|\/|\?)*)?(#((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|\/|\?)*)?$/i.test(url);
}

var testCases = [
    "http://www.google.com/",
    "https://www.google.com/",
    "ftp://www.google.com/",
    "http://google.com/",
    "http://google.com",
    "https://google.com",
    "http://www.google.com:80/",
    "https://www.google.com:443/",
    "http://127.0.0.1/",
    "http://127.0.0.1:9200/",
    "www.site.com",
    "x:",
    "http://",
    "javascript:alert('xss')",
    "http://w",
    "http:",
    "derp://www.google.com",
    "http://localserver"
],  div = document.getElementById("output");

for(var i=0; i < testCases.length; i++) {
    var test = testCases[i];
    div.innerHTML += (isUrlValid(test) ? "<span class='valid'>valid</span>:   " : "<span class='invalid'>invalid</span>: ") + "" + test + "\n";
}

.valid { color: green; }
.invalid { color: red; }

<pre id="output"></pre>

这处理unicode等，因此有点冗长.来源是验证插件本身.一些注意事项:可能是您想要的，但这并不是严格的正确.如果要接受http://w和http://localserver之类的东西，这些东西在Intranet环境中有效，但在大多数Web表单中通常不允许，则通常需要选择稍有不同的正则表达式.在某种程度上，此正则表达式更安全，因为在这种情况下，它需要 FQDN .同样，此处拒绝了其他示例(如自定义协议)，但这些示例仍然有效，并且可以用于当今使用的许多事物.如果您要问用户您的主页是什么?"的形式...不过您可能还是要排除这些.

This handles unicode, etc so it's a bit verbose. Source is the validation plugin itself. A few notes: it is probably what you want, but it is not strictly correct. Typically you need to choose a slightly different regex if you want to accept things like http://w and http://localserver which are valid in an intranet environment but not typically allowed in most web forms. In a way, this regex is safer because it requires a FQDN in such cases. Similarly other examples like custom protocols are rejected here, but are valid and do work for many things used today. If you're asking users "what's your homepage?" in a form though...you likely want to exclude these anyway.

以后会发现任何问题的人:请随时使用我附带的代码片段测试其他测试用例，如果您认为应该提到一个新的常见用例，请更新答案.我用最新的正则表达式重新编写了答案，并采用了这种格式，以便更好地为社区服务.

Anyone finding this later: please feel free to test additional test cases with the snippet I included and update the answer if you feel a new common case should be mentioned. I re-wrote the answer with the latest regex and in this format to better serve the community.

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