counting strings

[jscorpion]

Sorry for bothering everone again, but I have two more question. I was wondering how to take a number and start from the far right and read one number or decimal spot at a time. I am wanting to take a reading from an outside source then take each digit, locate it in a case statement then write out the appropriate jpg. I am able to do this in vb by creating a while loop.

while i<5
i = i + 1
singledigit = right$(number,1)
call sub casestatement()
wend

I am wandering how to do basically the same thing in javascript. I can't seem to find out how to pick apart a string. I also do not know how to format a number in javascript. In vb it is &quot;Label1.Caption = Format(numbervar, &quot;######.00&quot&quot;. If someone could help me with this I would deeply appreciate it. Like I mentioned the last time, I am new to javascript and I can't seem to find this info in the books that I am referencing.

Thank you,

jscorpion

 

[jaredn]

no problem j... I'll answer your first question quickly...

to access different pieces of a string (loop through it char by char) you can use:

for(var i=0;i<mystring.length;i++)
{
alert(mystring.charAt(i))
}

that will alert each letter, one at a time. Of course, you probably don't need to alert the letters, so change that part to whatever you need.

Also to actually get a larger piece of a string, use the substring method. more on all the string methods here:

http://msdn.microsoft.com/scripting/jscript/doc/jsobjstring.htm

There's no built in way to get a number to format that way, but you can try working with:

<script>
d=5.111111
</script>
<button onClick=&quot;alert(d.toFixed(2))&quot;>test</button> jared@aauser.com

 

[luciddream]

the toFixed() method only works in ie.

but, if you are trying to format a number to US currency, you can use this:

<script>
function String_toArray()
{
var charAr = new Array();
for(var i = 0;i < this.length;i++)
{
charAr = this.charAt(i);
}
return charAr;
}
String.prototype.toArray = String_toArray;

function String_reverse()
{
var str, charAr;
charAr = new Array();
charAr = this.toArray();
charAr = charAr.reverse();
str = charAr.join(&quot;&quot;
return str;
}
String.prototype.reverse = String_reverse;

function Number_toUSCurrency()
{
var str, tmpsplit, tmp, c, t, x;
str = new String(this);
tmpsplit = new Array();
if(str.indexOf(&quot;.&quot > -1)
{
tmpsplit = str.split(&quot;.&quot;
if(tmpsplit[1].length < 2)
{
tmpsplit[1] += &quot;0&quot;;
}
else if(tmpsplit[1].length > 2)
{
t = new Array();
t[0] = tmpsplit[1].substring(0, 1);
t[1] = new Number(tmpsplit[1].substring(1, 2));
t[3] = tmpsplit[1].substring(2, 3);
if(parseInt(t[3]) > 5)
{
t[1]++;
}
t[1] = new String(t[1]);
tmpsplit[1] = t[0]+t[1];
}
}
else
{
tmpsplit[0] = str;
tmpsplit[1] = &quot;00&quot;;
}
if(tmpsplit[0].length > 3)
{
c = 0;
x = 1;
tmpsplit[0] = tmpsplit[0].reverse();
tmp = new Array();
for(var i=0;i<((Math.floor(tmpsplit[0].length/3))+tmpsplit[0].length); i++)
{
if((!(x%4)))
{
tmp = &quot;,&quot;;
}
else
{
tmp = tmpsplit[0].charAt(c);
c++;
}
x++;
}
tmpsplit[0] = tmp.join(&quot;&quot;
tmpsplit[0] = tmpsplit[0].reverse();
}
return &quot;$&quot;+tmpsplit.join(&quot;.&quot;
}
Number.prototype.toUSCurrency = Number_toUSCurrency;
</script>

<script>
var d = 23.765;
alert(d.toUSCurrency()); adam@aauser.com

 

[luciddream]

uh-oh.. i for got to take off tgml...

sorry. code above = bad. this will work:

<script>
function String_toArray()
{
var charAr = new Array();
for(var i = 0;i < this.length;i++)
{
charAr = this.charAt(i);
}
return charAr;
}
String.prototype.toArray = String_toArray;

function String_reverse()
{
var str, charAr;
charAr = new Array();
charAr = this.toArray();
charAr = charAr.reverse();
str = charAr.join(&quot;&quot;
return str;
}
String.prototype.reverse = String_reverse;

function Number_toUSCurrency()
{
var str, tmpsplit, tmp, c, t, x;
str = new String(this);
tmpsplit = new Array();
if(str.indexOf(&quot;.&quot > -1)
{
tmpsplit = str.split(&quot;.&quot;
if(tmpsplit[1].length < 2)
{
tmpsplit[1] += &quot;0&quot;;
}
else if(tmpsplit[1].length > 2)
{
t = new Array();
t[0] = tmpsplit[1].substring(0, 1);
t[1] = new Number(tmpsplit[1].substring(1, 2));
t[3] = tmpsplit[1].substring(2, 3);
if(parseInt(t[3]) > 5)
{
t[1]++;
}
t[1] = new String(t[1]);
tmpsplit[1] = t[0]+t[1];
}
}
else
{
tmpsplit[0] = str;
tmpsplit[1] = &quot;00&quot;;
}
if(tmpsplit[0].length > 3)
{
c = 0;
x = 1;
tmpsplit[0] = tmpsplit[0].reverse();
tmp = new Array();
for(var i=0;i<((Math.floor(tmpsplit[0].length/3))+tmpsplit[0].length); i++)
{
if((!(x%4)))
{
tmp = &quot;,&quot;;
}
else
{
tmp = tmpsplit[0].charAt(c);
c++;
}
x++;
}
tmpsplit[0] = tmp.join(&quot;&quot;
tmpsplit[0] = tmpsplit[0].reverse();
}
return &quot;$&quot;+tmpsplit.join(&quot;.&quot;
}
Number.prototype.toUSCurrency = Number_toUSCurrency;
</script>

<script>
d = 34500.765;
alert(d.toUSCurrency());
</script> adam@aauser.com