<script
language="javascript"
type="text/javascript">
var
letterArray =
new
Array("A","B","C","D","E");
function
addElement(array)
{
size
=
array.length;
addindex
=
parseInt(prompt("Please
enter the element index where you would like to add an item.",""));
validNo
=
(addindex
!=
"NaN");
inRange
=
(
(addindex
>=
0)
&&
(addindex
<=
array.length+1)
);
if
(validNo
&&
inRange)
{
addvalue
=
prompt("Please
enter the value to be added as element index "
+
addindex +
".","");
for
(var
i=array.length+1;
i>addindex;
i--)
array[i]
=
array[i-1];
array[addindex]
=
addvalue;
array.length
=
array.length-1;
showArray(array);
}
else
alert("You
only add element indexes between 0 and "
+
(size)
+
".");
}
function
deleteElement(array)
{
size
=
array.length;
delindex
=
parseInt(prompt("Please
enter the element index of the item to remove.",""));
validNo
=
(delindex
!=
"NaN");
inRange
=
(
(delindex
>=
0)
&&
(delindex
<=
array.length)
);
if
(validNo
&&
inRange)
{
for
(var
i=0;
i<=size;
i++)
array[i]
=
((i
==
delindex)
?
"delete"
:
array[i]);
for
(var
j=delindex;
j<size-1;
j++)
if
(j
!=
size)
array[j]
=
array[j+1];
array.length
=
size-1;
alert("Element
index "
+
delindex +
" has been removed. The other
elements have moved to fill the spot.");
showArray(array);
}
else
alert("You
only delete from element index 0 to "
+
(size-1)
+
".");
}
function
showArray(array)
{
arraytext
=
"";
for
(var
i=0;
i<array.length;
i++)
{
arraytext
+=
"Element Index "
+
i +
": "
+
array[i]
+
"\n";
}
document.form.text.value
=
arraytext;
}
</script>
<form
name=form>
<input
type=button
value="Show
Array"
onClick="javascript:showArray(letterArray)"><br>
<input
type=button
value="Add
Element"
onClick="javascript:addElement(letterArray)">
<input
type=button
value="Delete
Element"
onClick="javascript:deleteElement(letterArray)"><br>
<br>
<textarea
name="text"
rows=10
cols=60></textarea>
</form>
