javascript - How to change the content of a file which is included in different scripts? -


i making website have make page active attributes on different lines different pages. put whole common script inside file header , include in every script. how can change content of line when including on different pages?

the header follows:

<!doctype html> <html lang="en">   <head>     <meta charset="utf-8">     <meta http-equiv="x-ua-compatible" content="ie=edge">     <meta name="viewport" content="width=device-width, initial-scale=1">     <title>bootstrap 101 template</title>      <!-- bootstrap -->     <link href="css/bootstrap.min.css" rel="stylesheet">     <link href="islamic.css" rel="stylesheet">     <link href='http://fonts.googleapis.com/css?family=lato:400,300italic' rel='stylesheet' type='text/css'>     <!-- html5 shim , respond.js ie8 support of html5 elements , media queries -->     <!-- warning: respond.js doesn't work if view page via file:// -->     <!--[if lt ie 9]>       <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>       <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>     <![endif]-->     <style>      html,body      {           height: 1500px;      }     .grey       {         background-color: #ccc;         padding: 20px;       }     </style>   </head>   <body>         <!-- going make page navigation purpose -->          <nav class="navbar navbar-inverse navbar-fixed-top" role = "navigation">                <div class="navbar-header">                     <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">                          <span class="icon-bar"> </span>                          <span class="icon-bar"> </span>                          <span class="icon-bar"> </span>                      </button>                      <a class="navbar-brand" href="index.php">ilm</a>                </div>                 <div class="navbar-collapse collapse">                     <ul class="nav navbar-nav">                          <li ><a href="index.php">home</a></li>                          <li ><a href="why.php">discuss</a></li>                          <li ><a href="aboutus.php">about us</a></li>                          <li ><a href="contacts.php">contact</a></li>                          <li class="dropdown">                           <a href="#" class="dropdown-toggle" data-toggle="dropdown"> social <b class="caret"> </b></a>                           <ul class="dropdown-menu">                             <li> <a href="http://www.facebook.com">facebook</a></li>                             <li> <a href="#">twitter</a></li>                             <li> <a href="#">linked in</a></li>                             <li> <a href="#">you tube</a></li>                           </ul>                           </li>                     </ul>                </div>         </nav>

i want change line 

<li ><a href="index.php" >home</a></li>

to

<li class="active"><a href="index.php">home</a></li>

for home page. want change line 

<li ><a href="aboutus.php" >about us</a></li>

to

<li class="active"><a href="aboutus.php">home</a></li>

for page. possible in php?

you can try somethign this

http://jsfiddle.net/habo/arjw2q6b/

place code @ end of </body> tag. guessing page urls have anchor tags hrefs. 1 each page load after full document id read script check if url contains "index.php" or other hrefs , if call function resetactivetab function remove active class list items (li) , add class=active current page

$(function(){     if(window.location.href.contains("index.php")){         resetactivetab("index.php");     }     else if(window.location.href.contains("why.php")){         resetactivetab("why.php");     }     else if(window.location.href.contains("aboutus.php")){         resetactivetab("aboutus.php");     }  } function resetactivetab(myselector){     $(".navbar-nav li").each(function( key, value ) {     //alert($(value).attr("class"));      $(value).removeclass("active");        if( $(value).find("a").attr("href") == myselector){            $(value).addclass("active");        }     }); }

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