JAVASCRIPT TUTORIALS - Javascript - If...Else
Javascript - If...Else
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Syntax:
if (expression){
Statement(s) to be executed if expression is true
}
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Example:
<script type="text/javascript">
<!--
var age = 20;
if( age > 18 ){
document.write("<b>Qualifies for driving</b>");
}
//-->
</script>
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Syntax:
if (expression){
Statement(s) to be executed if expression is true
}else{
Statement(s) to be executed if expression is false
}
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Example:
<script type="text/javascript">
<!--
var age = 15;
if( age > 18 ){
document.write("<b>Qualifies for driving</b>");
}else{
document.write("<b>Does not qualify for driving</b>");
}
//-->
</script>
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Does not qualify for driving
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Syntax:
if (expression 1){
Statement(s) to be executed if expression 1 is true
}else if (expression 2){
Statement(s) to be executed if expression 2 is true
}else if (expression 3){
Statement(s) to be executed if expression 3 is true
}else{
Statement(s) to be executed if no expression is true
}
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Example:
<script type="text/javascript">
<!--
var book = "maths";
if( book == "history" ){
document.write("<b>History Book</b>");
}else if( book == "maths" ){
document.write("<b>Maths Book</b>");
}else if( book == "economics" ){
document.write("<b>Economics Book</b>");
}else{
document.write("<b>Unknown Book</b>");
}
//-->
</script>
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