Обнаружьте URL в тексте с JavaScript

Question

Обнаружьте URL в тексте с JavaScript

Я написал для этого вспомогательный класс, для MVC 5 ... Он довольно гибкий и особенно полезен, если вам нужна эта функциональность, когда вы не находитесь внутри контроллера. Вы должны уметь перенести его прямо в проект и пойти.

Как отметил Мелиги, ключ должен включать протокол. Здесь у меня это жестко закодировано как http, поэтому, если вы хотите использовать SSL, который может оказаться немного более гибким.

public class AbsoluteUrlHelper
{
    /// <summary>
    /// Creates an absolute "fully qualified" url from an action, and assumes the current controller.
    /// </summary>
    /// <returns></returns>
    public static string GetAbsoluteUrl(string action, object routeValues = null)
    {
        var urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext);
        var values = urlHelper.RequestContext.RouteData.Values;
        var controller = values["controller"].ToString();

        return GetAbsoluteUrl(action, controller, urlHelper, routeValues);
    }

    /// <summary>
    /// Creates an absolute "fully qualified" url from an action and controller.
    /// </summary>
    public static string GetAbsoluteUrl(string action, string controller, object routeValues = null)
    {
        var urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext);

        return GetAbsoluteUrl(action, controller, urlHelper, routeValues);
    }

    /// <summary>
    /// Creates an absolute "fully qualified" url from an action and controller.
    /// </summary>
    public static string GetAbsoluteUrl(string action, string controller, UrlHelper urlHelper, object routeValues = null)
    {
        var uri = urlHelper.Action(action, controller, routeValues, "http");

        return uri;
    }
}

128

url regex javascript

задан David Thomas 27 January 2013 в 15:22

1 ответ

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score 188 · Accepted Answer

First you need a good regex that matches urls. This is hard to do. See here, here and here:

...almost anything is a valid URL. There are some punctuation rules for splitting it up. Absent any punctuation, you still have a valid URL.

Check the RFC carefully and see if you can construct an "invalid" URL. The rules are very flexible.

For example ::::: is a valid URL. The path is ":::::". A pretty stupid filename, but a valid filename.

Also, ///// is a valid URL. The netloc ("hostname") is "". The path is "///". Again, stupid. Also valid. This URL normalizes to "///" which is the equivalent.

Something like "bad://///worse/////" is perfectly valid. Dumb but valid.

Anyway, this answer is not meant to give you the best regex but rather a proof of how to do the string wrapping inside the text, with JavaScript.

OK so lets just use this one: /(https?:\/\/[^\s]+)/g

Again, this is a bad regex. It will have many false positives. However it's good enough for this example.

function urlify(text) {
    var urlRegex = /(https?:\/\/[^\s]+)/g;
    return text.replace(urlRegex, function(url) {
        return '<a href="' + url + '">' + url + '</a>';
    })
    // or alternatively
    // return text.replace(urlRegex, '<a href="$1">$1</a>')
}

var text = "Find me at http://www.example.com and also at http://stackoverflow.com";
var html = urlify(text);

// html now looks like:
// "Find me at <a href="http://www.example.com">http://www.example.com</a> and also at <a href="http://stackoverflow.com">http://stackoverflow.com</a>"

So in sum try:

$$('#pad dl dd').each(function(element) {
    element.innerHTML = urlify(element.innerHTML);
});