Question

我无法显示文本区域中的链接数。我使用以下代码：

Assembly assembly = Assembly.GetExecutingAssembly();
string resourceName = "FirstNames.csv";

using (Stream stream = assembly.GetManifestResourceStream(resourceName))
{
    using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
    {
        CsvReader csvReader = new CsvReader(reader);
        csvReader.Configuration.MissingFieldFound = null;
        csvReader.Configuration.HeaderValidated = null;
        var firstNames = csvReader.GetRecords<FirstName>().ToArray();
        context.FirstNames.AddOrUpdate(f => f.Name, firstNames);
    }
}

但这显示了网址的名称，例如：

插入文本区域：

<script>
$(function() {
    "use strict";
    var url = /[-a-zA-Z0-9@:%_\+.~#?&//=]{2,256}\.[a-z]{2,4}\b(\/[-a-zA-Z0-9@:%_\+.~#?&//=]*)?/gi;

    $("#textarea").on("keyup", function( e ) {
        var urls, output = "";
        if ( e.keyCode !== 8 && e.keyCode !== 9 && e.keyCode !== 13 && e.keyCode !== 32 && e.keyCode !== 46 ) {
            // Return is backspace, tab, enter, space or delete was not pressed.
            return;
        }

        while ((urls = url.exec(this.value)) !== null) {
            output += urls[0] + ", ";
        }
        $("#result").html("URLS: " + output.substring(0, output.length - 2));
    });
});
</script>

<textarea id="textarea" style="height: 300px; width: 500px;"></textarea>
<div id="result"></div>

显示：

https://www.google.com
https://www.amazon.com

但是我需要显示：

URLS: https://www.google.com, https://www.amazon.com

我尝试：

URLS: 2

但是获取URL的字母数。

有人可以帮助我吗？非常感谢

Answer 1

如果将output设置为数组而不是字符串，则可以使用length属性：

var output = [];

和

while ((urls = url.exec(this.value)) !== null) { output.push( urls[0] ); }

和

$("#result").html("URLS: " + output.length );

"use strict";
var url = /[-a-zA-Z0-9@:%_\+.~#?&//=]{2,256}\.[a-z]{2,4}\b(\/[-a-zA-Z0-9@:%_\+.~#?&//=]*)?/gi;

document.querySelector( 'textarea' ).addEventListener( 'keyup', function( e ) {
  var urls;
  var output = [];
  if ( e.keyCode !== 8 && e.keyCode !== 9 && e.keyCode !== 13 && e.keyCode !== 32 && e.keyCode !== 46 ) {
            // Return is backspace, tab, enter, space or delete was not pressed.
            return;
        }

  while ((urls = url.exec(this.value)) !== null) {
    output.push( urls[ 0 ] );
  }
  document.querySelector( '#result' ).innerHTML = "URLS: " + output.length;
});

textarea {
  height: 100px;
  width: 400px;
}

<textarea></textarea>
<div id="result"></div>

Answer 2

可以使用变量i进行此操作，并在循环外将其初始化为零。并为每次循环迭代将i增加1。

Go here for solution demo

Answer 3

从以下位置更改代码：

$(function() {
"use strict";
var url = /[-a-zA-Z0-9@:%_\+.~#?&//=]{2,256}\.[a-z]{2,4}\b(\/[-a-zA-Z0-9@:%_\+.~#?&//=]*)?/gi;

$("#textarea").on("keyup", function( e ) {
    var urls, output = "";
    if ( e.keyCode !== 8 && e.keyCode !== 9 && e.keyCode !== 13 && e.keyCode !== 32 && e.keyCode !== 46 ) {
        // Return is backspace, tab, enter, space or delete was not pressed.
        return;
    }

    while ((urls = url.exec(this.value)) !== null) {
        output += urls[0] + ", ";
    }
    $("#result").html("URLS: " + output.substring(0, output.length - 2));
});

}）;

收件人：

$(function() {
"use strict";
var url = /[-a-zA-Z0-9@:%_\+.~#?&//=]{2,256}\.[a-z]{2,4}\b(\/[-a-zA-Z0-9@:%_\+.~#?&//=]*)?/gmi;

$("#textarea").on("keyup", function( e ) {
    var urls, output = "";
    if ( e.keyCode !== 8 && e.keyCode !== 9 && e.keyCode !== 13 && e.keyCode !== 32 && e.keyCode !== 46 ) {
        // Return is backspace, tab, enter, space or delete was not pressed.
        return;
    }

  var urls = this.value.match(url);

  $("#result").html(urls.length);
});

}）;

https://codepen.io/jthomas077/pen/gjZbPe

注意：如果需要，您仍然可以遍历比赛。

如何用此代码计算链接数

3 个答案: