I have this Javascript problem I cannot solve. My code is:
<script type="text/javascript">
var l=liste.rows.length;
var i;
var den=0
for (i=0;i<=l;i++)
{
den=parseInt(liste.rows[i].cells[7].innerHTML)
den+=den
}
alert(den)
</script>
When I put alert(den) inside the bracket code works for each step. But when I put it outside the bracket I can't have an alert box, couldn't figure out why. Can anybody help me?
I have this Javascript problem I cannot solve. My code is:
<script type="text/javascript">
var l=liste.rows.length;
var i;
var den=0
for (i=0;i<=l;i++)
{
den=parseInt(liste.rows[i].cells[7].innerHTML)
den+=den
}
alert(den)
</script>
When I put alert(den) inside the bracket code works for each step. But when I put it outside the bracket I can't have an alert box, couldn't figure out why. Can anybody help me?
Share Improve this question edited Jun 18, 2017 at 9:15 Brian Tompsett - 汤莱恩 5,89372 gold badges61 silver badges133 bronze badges asked Dec 31, 2010 at 11:21 AlbertAlbert 31 silver badge3 bronze badges 1-
3
Don't forget to add the radix to the parseInt, otherwise you might get weird results if your values happen to start with
0. =>parseInt(value, 10);. – Tatu Ulmanen Commented Dec 31, 2010 at 11:30
2 Answers
Reset to default 6You are overwritting den each iteration, change to this:
<script type="text/javascript">
var l=liste.rows.length;
var i;
var den=0;
for (i=0;i<l;i++) {
den += parseInt(liste.rows[i].cells[7].innerHTML, 10);
}
alert(den);
</script>
edit: according to Tatu Ulmanen's ment I add radix to parseInt, this one drove me crazy a couple of months ago xD
You must assure first that the text is integer indeed the do the summation,
TryParseInt will do that for you.
function TryParseInt(str,defaultValue)
{
var retValue = defaultValue;
if(str!=null)
{
if(str.length>0)
{
if (!isNaN(str))
{
retValue = parseInt(str);
}
}
}
return retValue;
}
var den = 0;
for (var i=0; i<=liste.rows.length; i++)
{
den += TryParseInt(liste.rows[i].cells[7].innerHTML,0);
}
alert(den);
Reference