JavaScript Tutorial/jQuery/Selector children — различия между версиями

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м (1 версия)
 
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Текущая версия на 08:25, 26 мая 2010

Finds all children of the element with id "main"

<html>
  <head>
    <script type="text/javascript" src="js/jquery-1.3.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
                
           $("#main > *").css("border", "3px solid red");
                
        });
    </script>
  </head>
  <body>
    <body>
      <span id="main">
        <div>asdf</div>
        <button>Child</button>
        <span>A Span</span>
      </span>
    </body>
</html>


Finds all p elements that are children of a div element

<html>
  <head>
    <script type="text/javascript" src="js/jquery-1.3.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
           $("div > p").css("border", "1px solid gray");   

        });
    </script>
  </head>
  <body>
    <body>
        <div><p>asdf</p></div>
    </body>
</html>


Is it the first child

<html>
  <head>
    <script type="text/javascript" src="js/jquery-1.3.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
           $("div").one("click", function () {
              if ($(this).is(":first-child")) {
                $("p").text("It"s the first div.");
              }else{
                $("p").text("It"s NOT the first div.");
              }
              $("p").hide().slideDown("slow");
              
           });
        });
    </script>
     <style>
     div { border:2px white solid;}
  </style>
  </head>
  <body>
    <body>
      Press each to see the text.
      <div>asdf</div>
      <div>asdf</div>
      <div>asdf</div>
      <div>asdf</div>
      <div>asdf</div>
      <div>asdf</div>
      <p></p>
  </body>
</html>


Matches all child elements specified by child of elements specified by parent

<html>
  <head>
    <script type="text/javascript" src="js/jquery-1.3.2.js"></script>
    <script type="text/javascript">
  $(document).ready(function(){
    
     $("#main > *").css("border", "1px solid red");

  });
    </script>
  </head>
  <body>
      <span id="main">
          <button>Child</button>
          <form>
            <button>grand child</button>
          </form>
      </span>
  </body>
</html>


nthChild(index)

<html>
  <head>
    <script type="text/javascript" src="js/jquery-1.3.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
                $("ul li:nth-child(2)").append("<span> - 2nd!</span>");
        });
    </script>
  </head>
  <body>
    <body>
      <div>
        <ul>
            <li>A</li>
            <li>B</li>
            <li>C</li>
        </ul>
      </div>
      <div>
        <ul>
            <li>D</li>
            <li>E</li>
            <li>F</li>
            <li>G</li>
            
        </ul>
      </div>
      <div>
        <ul>
            <li>H</li>
            <li>I</li>
            <li>J</li>
            <li>K</li>
        </ul>
      </div>
    </body>
</html>


onlyChild(): If the parent has other child elements, nothing is matched.

<html>
  <head>
    <script type="text/javascript" src="js/jquery-1.3.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
             $("div ul:only-child").text("only has ul").css("border", "2px blue solid");
        });
    </script>
  </head>
  <body>
    <body>
      <div>
        <ul>
            <li>A</li>
            <li>B</li>
            <li>C</li>
        </ul>
      </div>
      <div>
        <ul>
            <li>D</li>
            <li>E</li>
            <li>F</li>
            <li>G</li>
            
        </ul>
      </div>
      <div>
        <ul>
            <li>H</li>
            <li>I</li>
            <li>J</li>
            <li>K</li>
        </ul>
      </div>
    </body>
</html>


Select n-th child

<html>
  <head>
    <script type="text/javascript" src="js/jquery-1.3.2.js"></script>
    <script type="text/javascript">
    $(document).ready(function(){
        $("ul li:nth-child(2)").append("<span>*</span>");
    });
    </script>
  </head>
  <body>
      <div>
        <ul>
            <li>A</li>
            <li>B</li>
            <li>C</li>
        </ul>
      </div>
  </body>
</html>
Источник — «http://wbex.ru/index.php?title=JavaScript_Tutorial/jQuery/Selector_children&oldid=9555»