How jQuery determines the browser and dynamically adjusts the select width

How jQuery determines the browser and dynamically adjusts the select width_jquery

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Release： 2016-05-16 15:12:34

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The example in this article describes how jQuery determines the browser and dynamically adjusts the select width. Share it with everyone for your reference, the details are as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
  <title>Untitled Page</title> 
  <mce:script src="jquery-1.4.4.js" mce_src="jquery-1.4.4.js" type="text/javascript"></mce:script> 
  <mce:script type="text/javascript"><!-- 
    function userBrowser() { 
      var browserName = navigator.userAgent.toLowerCase(); 
      if (/msie/i.test(browserName) && !/opera/.test(browserName)) { 
        browserName="ie"; 
      } else if (/firefox/i.test(browserName)) { 
        browserName = "firefox"; 
      } else if (/chrome/i.test(browserName) && /webkit/i.test(browserName) && /mozilla/i.test(browserName)) { 
        browserName = "chrome"; 
      } else if (/opera/i.test(browserName)) { 
        browserName = "opera"; 
      } else if (/webkit/i.test(browserName) && !(/chrome/i.test(browserName) && /webkit/i.test(browserName) && /mozilla/i.test(browserName))) { 
        browserName = "safari"; 
      } else { 
        browserName = "unknow"; 
      } 
      return browserName; 
    } 
    $(function() { 
      var browser = userBrowser(); 
      if (browser == "ie") { 
        $("select").each(function() { 
          $(this).css("width", ($(this).width() + 10) + "px"); 
        }); 
      } 
      else if (browser == "firefox") { 
        $("select").each(function() { 
          $(this).css("width", ($(this).width() + 8) + "px"); 
        }); 
      } 
      else if (browser == "chrome") { 
        $("select").each(function() { 
          $(this).css("width", ($(this).width() + 6) + "px"); 
        }); 
      } 
      else if (browser == "safari") { 
        $("select").each(function() { 
          $(this).css("width", ($(this).width() + 30) + "px"); 
        }); 
      } 
    }); 
// --></mce:script> 
</head> 
<body> 
  <div> 
    <!-- 注: select 在doctype下, 会出现width比同width的text短, ie为6px, ff为4px --> 
    <input id="t1" type="text" style="width: 400px;" /><br /> 
    <select id="s1" style="width: 400px;"> 
      <option>1</option> 
    </select><br /> 
    <textarea id="TextArea1" cols="20" rows="2" style="width: 400px;"> 
  </div>
</body>
</html>

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Readers who are interested in more jQuery-related content can check out the special topics on this site: "JQuery drag effects and skills summary", "jQuery extension skills summary", "JQuery common classic special effects summary", "jQuery animation and special effects usage summary", "jquery selector usage summary" and "jQuery common plug-ins and usage Summary》

I hope this article will be helpful to everyone in jQuery programming.