JavaScript DHTML/Language Basics/Switch — различия между версиями

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Версия 09:59, 26 мая 2010

Another switch Statement

  
<HTML>
<HEAD>
<TITLE>Using the switch Statement</TITLE>
</HEAD>
<BODY>
<SCRIPT LANGUAGE="JavaScript"><!--
for(i=1; i<=10; ++i) {
 switch (i) {
  case 1:
   val = "one"
   break;
  case 2:
   val = "two"
   break;
  case 3:
   val = "three"
   break;
  case 4:
   val = "four"
   break;
  case 5:
   val = "five"
   break;
  case 6:
   val = "six"
   break;
  case 7:
   val = "seven"
   break;
  case 8:
   val = "eight"
   break;
  case 9:
   val = "nine"
   break;
  case 10:
   val = "ten"
   break;
  default:
   val = "unknown"
 }
 document.writeln(val+"<BR>");
}
// -->
</SCRIPT>
</BODY>
</HTML>



Switch based on integer value

 
<HTML>
<BODY>
<H1>
   <SCRIPT>
var n = 1;
switch (n) {
case 1: {
     document.write("n equals 1");
     break;
}
case 2:{
     document.write("n equals 2");
     break;
}
case 3:{
     document.write("n equals 3");
     break;
}
default:{
     document.write("No match!");
     break;
   }
}
   </SCRIPT>
</H1>
</BODY>
</HTML>



Switch statement

  
/* Note that Sunday=0, Monday=1, Tuesday=2, etc.*/
<html>
<body>
<script type="text/javascript">
var d = new Date()
theDay=d.getDay()
switch (theDay){
  case 5:
    document.write("Finally Friday")
  break
  case 6:
    document.write("Super Saturday")
  break
  case 0:
    document.write("Sleepy Sunday")
  break
  default:
    document.write("Not weekend!")
}
</script>

</body>
</html>



Switch with string value

 

<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
var inputName = prompt("Please enter your name:");
switch(inputName) {
    case "Tom":
        document.write("Welcome " + inputName);
        break;
    case "Name":
        document.write("Name");
        break;
    default:
        document.write("default:" + inputName);
}
</script>
</body>
</html>



The switch Construction in Action

  
/*
JavaScript Bible, Fourth Edition
by Danny Goodman 
John Wiley & Sons CopyRight 2001
*/

<HTML>
<HEAD>
<TITLE>Switch Statement and Labeled Break</TITLE>
<SCRIPT LANGUAGE="JavaScript1.2">
// build two product arrays, simulating two database tables
function product(name, price) {
    this.name = name
    this.price = price
}
var ICs = new Array()
ICs[0] = new product("Septium 900MHz","$149")
ICs[1] = new product("Septium Pro 1.0GHz","$249")
ICs[2] = new product("Octium BFD 750MHz","$329")
var snacks = new Array
snacks[0] = new product("Rays Potato Chips","$1.79")
snacks[1] = new product("Cheezey-ettes","$1.59")
snacks[2] = new product("Tortilla Flats","$2.29")
// lookup in the "table" associated with the product
function getPrice(selector) {
    var chipName = selector.options[selector.selectedIndex].text
    var outField = document.forms[0].cost
    master:
        switch(selector.options[selector.selectedIndex].value) {
            case "ICs":
                for (var i = 0; i < ICs.length; i++) {
                    if (ICs[i].name == chipName) {
                        outField.value = ICs[i].price
                        break master
                    }
                }
                break
            case "snacks":
                for (var i = 0; i < snacks.length; i++) {
                    if (snacks[i].name == chipName) {
                        outField.value = snacks[i].price
                        break master
                    }
                }
                break
            default:
                outField.value = "Not Found"
        }
}
</SCRIPT>
</HEAD>
<BODY>
<B>Branching with the switch Statement</B>
<HR>
Select a chip for lookup in the chip price tables:<P>
<FORM>
Chip:<SELECT NAME="chips" onChange="getPrice(this)">
    <OPTION>
    <OPTION VALUE="ICs">Septium 900MHz
    <OPTION VALUE="ICs">Septium Pro 1.0GHz
    <OPTION VALUE="ICs">Octium BFD 750MHz
    <OPTION VALUE="snacks">Rays Potato Chips
    <OPTION VALUE="snacks">Cheezey-ettes
    <OPTION VALUE="snacks">Tortilla Flats
    <OPTION>Poker Chipset
</SELECT>&nbsp;
Price:<INPUT TYPE="text" NAME="cost" SIZE=10>
</FORM>
</BODY>
</HTML>



The switch Statement

  
<html>
<head>
  <title>The switch Statement</title>
</head>
<body>
  <script language="JavaScript1.2" type="text/javascript">
  <!--
    var request = "Name";
    switch(request){
      case "Logo" :
        document.write("<img src="logo.gif" alt="Logo">");
        document.write("<br>");
        break;
      case "Name" :        
        document.write("Software Inc.");
        document.write("<br>");
        break;
      case "Products" :
        document.write("MyEditor");
        document.write("<br>");
        break;
      default :
        document.write("www.wbex.ru");
        break;
    }
  //-->
  </script>
</body>
</html>



Use switch with true false value

  
<html>
<head>
<title>A Simple Page</title>
<script language="JavaScript">
var yourchoice;
yourchoice = confirm("True of false")
switch (yourchoice)
{
    case true:
        alert("true!");
        break;
    case false:
        alert("false");
        break;
}   
</script>
</head>
<body>
</body>
</html>
Источник — «http://wbex.ru/index.php?title=JavaScript_DHTML/Language_Basics/Switch&oldid=3146»