JavaScript Tutorial/Dojo toolkit/exist

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Check class existance

<html>
  <head>
    <style>
      .myClass {
        color : #ff0000;
      }
    </style>
    <script type="text/javascript">
      var djConfig = {
        baseScriptUri : "js/dojo/"
      };
    </script>
    <script type="text/javascript" src="js/dojo/dojo/dojo.js"></script>
    <script type="text/javascript">
     function f(){
        alert(dojo.hasClass("myDiv", "myClass"));
     } 
    </script>
  </head>
  <body onLoad="f();">
    <div class="myClass" id="myDiv">myDiv</div>
  </body>
</html>


Check existance for property

<html>
  <head>
    <script type="text/javascript">
      var djConfig = {
        baseScriptUri : "js/dojo/"
      };
    </script>
    <script type="text/javascript" src="js/dojo/dojo/dojo.js"></script>
  </head>
  <body>
    <script>
      var myObj = {myProp:123};
      alert(dojo.exists("myObj.myProp"));
    </script>
  </body>
</html>


Check function existance

<html>
  <head>
    <script type="text/javascript">
      var djConfig = {
        baseScriptUri : "js/dojo/"
      };
    </script>
    <script type="text/javascript" src="js/dojo/dojo/dojo.js"></script>
  </head>
  <body>
    <script>
      var myObj = {myProp:123};
      alert(dojo.exists("myObj.myFunc"));
    </script>
  </body>
</html>


Search property with exist function

<html>
  <head>
    <script type="text/javascript">
      var djConfig = {
        baseScriptUri : "js/dojo/"
      };
    </script>
    <script type="text/javascript" src="js/dojo/dojo/dojo.js"></script>
  </head>
  <body>
    <script>
      var myObj = {myProp:123};
      alert(dojo.exists("myProp", myObj) );
    </script>
  </body>
</html>
Источник — «http://wbex.ru/index.php?title=JavaScript_Tutorial/Dojo_toolkit/exist&oldid=8675»