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Example 4.4:
The Scope of Variables
We used the following scripts. First, we declared the variables and defined the functions in the HEAD:
<![CDATA[
<!--
var variable1 = "Contents of variable1 OUTSIDE the functions"
function funcExmpl1() {
alert(variable1)
}
function funcExmpl2() {
var variable1 = "Contents of variable1 INSIDE the function"
alert(variable1)
}
function funcExmpl3() {
alert(variable2)
}
//-->
</SCRIPT>
]]>
Then we created these buttons:
<![CDATA[
<FORM>
<INPUT TYPE="button" NAME="ButtonA" VALUE=" Show the global variable1 outside the functions " onclick="alert(variable1)">
<P>
<INPUT TYPE="button" NAME="ButtonB" VALUE=" Show the global variable1 as seen from function funcExmpl1 " onclick="funcExmpl1()">
<P>
<INPUT TYPE="button" NAME="ButtonC" VALUE=" Show the local variable1 as seen from function funcExmpl2 " onclick="funcExmpl2()">
<P>
<INPUT TYPE="button" NAME="ButtonD" VALUE="Using a variable in a function where the variable not been declared" onclick="funcExmpl3()">
</FORM>
]]>
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