Dictionary.Exists() : Dictionary « MS JScript « JavaScript Tutorial






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  2. MS JScript
  3. Dictionary

Syntax

dictionaryobj.Exists(key)

The Exists() method determines if an item exists in the dictionary based on the key that is passed in to the method.

If key exists, true is returned, otherwise false is returned from the method.

<html>
    <script language="JScript">
    <!--
    var fruits = new ActiveXObject("Scripting.Dictionary");

    fruits.Add("A","apple");
    fruits.Add("B","berry");
    fruits.Add("G","grape");
    fruits.Add("O","orange");

    if(fruits.Exists("S"))
      document.write("The fruit ",fruits.Item('S')," exists in dictionary.");
    else
      document.write("No fruits that begin with <b>s</b> exist in dictionary.");
    -->
    </script>
    </html>








32.4.Dictionary
32.4.1.Dictionary
32.4.2.Dictionary.Add()
32.4.3.Dictionary.Count
32.4.4.Dictionary.Exists()
32.4.5.Dictionary.Item()
32.4.6.Dictionary.Items()
32.4.7.Dictionary.Key()
32.4.8.Dictionary.Keys()
32.4.9.Dictionary.Remove()
32.4.10.Dictionary.RemoveAll()