'number expected' error in IE

D

David Cook

The html file below gets intermittent errors 'error on page' ('number
expected')
when clicking on column-headings to sort. Yet, this same file works
flawlessly
in other browsers (i.e. Opera, Mozilla, Netscape, etc.).

Can anyone suggest a fix/workaround?

Cheers...

Dave




<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/tr/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Whitewater Runs</title>
<style type="text/css">
table {table-collapse:collapse; border-spacing:0;}
td {border:2px groove black; padding:7px;
background-color:lightgrey;}
th {border:2px groove black; padding:7px;
background-color:lightblue;}
.ctr {text-align:center;}
</style>
<script type="text/javascript">
// Table data -- an array of objects
var jsData = new Array();
// jsData[0] = {elem1:"elem1Value", elem2:"elem2Value",
elem3:"elem3Value"};
// (etc)


jsData[0] =
{
RiverName : "Androscoggin",
Location : "Errol Bridge to Pontook Rapid",
FlowType : "Dam",
RunMiles : 20.0,
State : "NH",
Latitude : "N44/46.8'",
Longitude : "W71/07.8'"
};


jsData[1] =
{
RiverName : "Blue Hill Falls",
Location : "Blue Hill Falls",
FlowType : "Tide",
RunMiles : 0.0,
State : "ME",
Latitude : "N44/23.6'",
Longitude : "W68/59.3'"
};


jsData[2] =
{
RiverName : "Cohasset",
Location : "Cohasset",
FlowType : "Tide",
RunMiles : 0.0,
State : "MA",
Latitude : "N42/14.5'",
Longitude : "W70/48.7'"
};


jsData[3] =
{
RiverName : "Contoocook",
Location : "Hillsborough to Henniker",
FlowType : "Rain",
RunMiles : 2.2,
State : "NH",
Latitude : "N43/08.6'",
Longitude : "W71/52.2'"
};


jsData[4] =
{
RiverName : "Dead(at low water levels)",
Location : "Spencer Stream to the Forks",
FlowType : "Dam",
RunMiles : 20,
State : "ME",
Latitude : "N45/18.0'",
Longitude : "W70/13.0'"
};


jsData[5] =
{
RiverName : "Dead(at high water levels)",
Location : "Spencer Stream to the Forks",
FlowType : "Dam",
RunMiles : 20,
State : "ME",
Latitude : "N45/18.0'",
Longitude : "W70/13.0'"
};


jsData[6] =
{
RiverName : "Deerfield (FifeBrook)",
Location : "Fife Brook Dam to Zoar Gap",
FlowType : "Dam",
RunMiles : 4.8,
State : "MA",
Latitude : "N42/41.2'",
Longitude : "W73/06.8'"
};


jsData[7] =
{
RiverName : "Deerfield (MonroeBrDryway)",
Location : "Monroe Bridge to Dunbar Brook",
FlowType : "Dam",
RunMiles : 3.0,
State : "MA",
Latitude : "N42/42.0'",
Longitude : "W73/07.0'"
};


jsData[8] =
{
RiverName : "Jenness Beach",
Location : "Jenness Beach (Rye)",
FlowType : "Surf",
RunMiles : 0.0,
State : "NH",
Latitude : "N42/59.0'",
Longitude : "W70/45.8'"
};


jsData[9] =
{
RiverName : "Kennebec",
Location : "Harris Station Dam to the Forks",
FlowType : "Dam",
RunMiles : 11.0,
State : "ME",
Latitude : "N45/27.5'",
Longitude : "W69/51.7'"
};


jsData[10] =
{
RiverName : "Magalloway",
Location : "Aziscohos Hydro to Wilson Mills",
FlowType : "Dam",
RunMiles : 1.75,
State : "ME",
Latitude : "N44/55.8'",
Longitude : "W70/59.0'"
};


jsData[11] =
{
RiverName : "Merrimack",
Location : "Arms Park (Manchester)",
FlowType : "Dam",
RunMiles : 0.5,
State : "NH",
Latitude : "N43/00.0'",
Longitude : "W71/26.7'"
};


jsData[12] =
{
RiverName : "Merrimack",
Location : "Heritage Trail(Bedford)",
FlowType : "Dam",
RunMiles : 0.6,
State : "NH",
Latitude : "N42/59.9'",
Longitude : "W71/26.7'"
};


jsData[13] =
{
RiverName : "Ogunquit Beach",
Location : "Ogunquit Beach",
FlowType : "Surf",
RunMiles : 0.0,
State : "ME",
Latitude : "N43/16.0'",
Longitude : "W70/35.3'"
};


jsData[14] =
{
RiverName : "Pemigewasset(Bristol Gorge)",
Location : "Ayers Island Dam to Coolidge Woods Rd",
FlowType : "Dam",
RunMiles : 1.0,
State : "NH",
Latitude : "N43/35.8'",
Longitude : "W71/43.1'"
};


jsData[15] =
{
RiverName : "Piscataquog",
Location : "Goffstown to Pinardville",
FlowType : "Dam",
RunMiles : 2.0,
State : "NH",
Latitude : "N43/01.0'",
Longitude : "W71/34.1'"
};


jsData[16] =
{
RiverName : "Quaboag",
Location : "Warren to Route 67",
FlowType : "Rain",
RunMiles : 5.5,
State : "MA",
Latitude : "N42/12.7'",
Longitude : "W72/14.0'"
};


jsData[17] =
{
RiverName : "Rapid",
Location : "Middle Dam to Cedar Stump",
FlowType : "Dam",
RunMiles : 4.5,
State : "ME",
Latitude : "N44/46.0'",
Longitude : "W70/57.0'"
};


jsData[18] =
{
RiverName : "Sheepscot Reversing Falls",
Location : "5 miles northeast of Wiscasset",
FlowType : "Tide",
RunMiles : 0.0,
State : "ME",
Latitude : "N44/03.0'",
Longitude : "W69/37.0'"
};


jsData[19] =
{
RiverName : "Souhegan",
Location : "Greenville to Wilton",
FlowType : "Rain",
RunMiles : 3.5,
State : "NH",
Latitude : "N42/47.2'",
Longitude : "W71/48.2'"
};


jsData[20] =
{
RiverName : "Millers (Upper)",
Location : "South Royalston to Athol",
FlowType : "Rain",
RunMiles : 7.0,
State : "MA",
Latitude : "N42/37.8'",
Longitude : "W72/08.9'"
};


jsData[21] =
{
RiverName : "West (upper)",
Location : "Ball Mtn Dam to Jamaica St Park",
FlowType : "Dam",
RunMiles : 2.5,
State : "VT",
Latitude : "N43/07.6'",
Longitude : "W72/46.3'"
};


jsData[22] =
{
RiverName : "West (lower)",
Location : "Jamaica St Park to Townshend Res",
FlowType : "Dam",
RunMiles : 5.5,
State : "VT",
Latitude : "N43/06.3'",
Longitude : "W72/46.4'"
};


jsData[23] =
{
RiverName : "White",
Location : "N.Royalton to S.Royalton",
FlowType : "Rain",
RunMiles : 7.5,
State : "VT",
Latitude : "N43/49.3'",
Longitude : "W72/32.6'"
};


jsData[24] =
{
RiverName : "Winnipesaukee",
Location : "Franklin",
FlowType : "Dam",
RunMiles : 1.0,
State : "NH",
Latitude : "N43/26.6'",
Longitude : "W71/37.3'"
};



// Draw table from 'jsData' array of objects
function drawTable(tbody) {
var tr, td;
tbody = document.getElementById(tbody);
// remove existing rows, if any
clearTable(tbody);
// loop through data source
for (var i = 0; i < jsData.length; i++) {
tr = tbody.insertRow(tbody.rows.length);

td = tr.insertCell(tr.cells.length);
td.innerHTML = jsData.RiverName;

td = tr.insertCell(tr.cells.length);
td.setAttribute("align", "center");
td.innerHTML = jsData.Location;

td = tr.insertCell(tr.cells.length);
td.setAttribute("align", "center");
td.innerHTML = jsData.FlowType;

td = tr.insertCell(tr.cells.length);
td.setAttribute("align", "center");
td.innerHTML = jsData.RunMiles;

td = tr.insertCell(tr.cells.length);
td.setAttribute("align", "center");
td.innerHTML = jsData.State;

td = tr.insertCell(tr.cells.length);
td.setAttribute("align", "center");
td.innerHTML = jsData.Latitude;

td = tr.insertCell(tr.cells.length);
td.setAttribute("align", "center");
td.innerHTML = jsData.Longitude;
}
}

// Remove existing table rows
function clearTable(tbody) {
while (tbody.rows.length > 0) {
tbody.deleteRow(0);
}
}

// Sorting function dispatcher (invoked by table column links)
function sortTable(link) {
switch (link.firstChild.nodeValue) {
case "RiverName" :
jsData.sort(sortByRiverName);
break;
case "Location" :
jsData.sort(sortByLocation);
break;
case "FlowType" :
jsData.sort(sortByFlowType);
break;
case "RunMiles" :
jsData.sort(sortByRunMiles);
break;
case "State" :
jsData.sort(sortByState);
break;
case "Latitude" :
jsData.sort(sortByLatitude);
break;
case "Longitude" :
jsData.sort(sortByLongitude);
break;
}
drawTable("wwData")
return false
}

// Sorting functions (invoked by sortTable())
function sortByRiverName(a, b) {
a = a.RiverName.toLowerCase();
b = b.RiverName.toLowerCase();
return ((a < b) ? -1 : ((a > b) ? 1 : 0));
}
function sortByLocation(a, b) {
a = a.Location.toLowerCase();
b = b.Location.toLowerCase();
return ((a < b) ? -1 : ((a > b) ? 1 : 0));
}
function sortByFlowType(a, b) {
a = a.FlowType.toLowerCase();
b = b.FlowType.toLowerCase();
return ((a < b) ? -1 : ((a > b) ? 1 : 0));
}
function sortByRunMiles(a, b) {
return a.RunMiles - b.RunMiles;
}
function sortByState(a, b) {
a = a.State.toLowerCase();
b = b.State.toLowerCase();
return ((a < b) ? -1 : ((a > b) ? 1 : 0));
}
function sortByLatitude(a, b) {
a = a.Latitude.toLowerCase();
b = b.Latitude.toLowerCase();
return ((a < b) ? -1 : ((a > b) ? 1 : 0));
}
function sortByLongitude(a, b) {
a = a.Longitude.toLowerCase();
b = b.Longitude.toLowerCase();
return ((a < b) ? -1 : ((a > b) ? 1 : 0));
}

</script>
</head>

<body onload="drawTable('wwData')" bgcolor="white">



<h2>Whitewater that I've run by kayak:</h2>
<h4>(Note that client can now click on each column-heading to sort
the data.)</h4>
<h4>(Re-sorting happens on the client side...no further server hits
are required!)</h4>
<hr />

<table id="myTable">
<thead>
<tr>
<th><a href="#" title="Sort by RiverName"
onclick="return sortTable(this)">RiverName</a></th>
<th><a href="#" title="Sort by Location"
onclick="return sortTable(this)">Location</a></th>
<th><a href="#" title="Sort by FlowType"
onclick="return sortTable(this)">FlowType</a></th>
<th><a href="#" title="Sort by RunMiles"
onclick="return sortTable(this)">RunMiles</a></th>
<th><a href="#" title="Sort by State"
onclick="return sortTable(this)">State</a></th>
<th><a href="#" title="Sort by Latitude"
onclick="return sortTable(this)">Latitude</a></th>
<th><a href="#" title="Sort by Longitude"
onclick="return sortTable(this)">Longitude</a></th>
</tr>
</thead>
<tbody id="wwData"></tbody>
</table>

</body>
</html>
 
V

Vincent van Beveren

Hi David,

Somehow it parse the return results for the sorting function wrongly
and thinks its not a number, but a string. You could either take out
all white spaces from the return values like this:

return ((a < b) ?-1: ((a > b) ?1:0)); )

But that wouldn't improve readability, so, you can also say it
explicitly and simply changing

return ((a < b) ? -1 : ((a > b) ? 1 : 0));

into

return parseInt((a < b) ? -1 : ((a > b) ? 1 : 0));

should make things work.

Good luck,
Vincent
 
L

Lasse Reichstein Nielsen

David Cook said:
The html file below gets intermittent errors 'error on page' ('number
expected')
Click to expand...

Highly curious. This reduced example gives the same effect:
---
var l = ["a","b"];
var pa,pb;
var sa,sb;
function cmpx(a,b) {
pa = a; pb = b;
a = a.toLowerCase();
b = b.toLowerCase();
sa = a; sb = b;
return ((a<b)? -1 : ((a>b)? 1 : 0));
}
try {
for (var i=0; i<1000;i++) {
l.sort(cmpx);
}
} catch (e) {
alert(
"after "+i+" rounds: "+ e.message + "\n" +
"a = " + sa + "(" + typeof sa +"), was: " +
pa + "(" + typeof pa + ")\n" +
"b = " + sb + "(" + typeof sb +"), was: " +
pb + "(" + typeof pb + ")\n");
}
---

It's definitly a bug.

It seems toLowerCase fails, returning a value of unknown
type. However, it only happens while being called from sort. Calling
cmpx manually a million times doesn't fail.

The problem also goes away if you rename the result, i.e., instead of
a = a.toLowerCase();
you write
var ta = a.toLowerCase();
Then "ta" is never foobar'ed like "a" is. (That's a workaround, by the way).


I can see that you have a lot of repetetive code. There are ways to make
that smaller.

For the data, you can make a constructor function:
---
function Run(riverName, location, flowType, runMiles,
state, latitutde, longtitude) {
this.RiverName = riverName;
this.Location = location;
this.FlowType = flowType;
this.RunMiles = runMiles;
this.State = state;
this.Latitude = latitude;
this.Longtitude = longtitude;
}
---
Then you can create the array in one go;
---
var jsData = [
new Run("Androscoggin",
"Errol Bridge to Pontook Rapid",
"Dam",
20.0,
"NH",
"N44/46.8'",
"W71/07.8'"),
new Run("Blue Hill Falls",
"Blue Hill Falls",
"Tide",
0.0,
"ME",
"N44/23.6'",
"W68/59.3'"),
...
];
---
This avoids the repetitions of "RiverName" etc.
While it might not be as instantly readable, there are less risk of
typos and less bytes to transfer.

Also, the comparison functions are all very similar. You could
use one function to generate all the comparison functions, avoiding
duplicate code:
---
function makePropertyComparator(property) {
return function(a,b) {
var ta = a[property].toLowerCase();
var tb = b[property].toLowerCase();
return (tb<ta)-(ta<tb); // shorter
}
}
var sortByRiverName = makePropertyComparator("RiverName");
var sortByLocation = makePropertyComparator("Location");
var sortByFlowType = makePropertyComparator("FlowType");
....
 
D

Dr John Stockton

JRS: In article <[email protected]>, seen in
news:comp.lang.javascript said:
It seems toLowerCase fails, returning a value of unknown
type. However, it only happens while being called from sort. Calling
cmpx manually a million times doesn't fail.
Click to expand...

How about toUpperCase?

Where the data being sorted is of significant size N, using toLowerCase
in a comparison function is a program design error.

The comparison function will be called, typically, more than o(N) times,
such as o(N*ln(N)). Case conversion must involve iterating through the
string and creating an object; it is not a negligible task.

For N sufficiently (maybe not very) large, it will be better to use time
o(N) to create the keys, and to use those keys in the comparison.

Something like, starting with array A,
var T = []
for (J=0; J<N; J++) T[J] = {Data:(t=A[J]) ; Key:KeyFn(t)}
then sort T with the comparison function comparing T[J].Key .

Or just compare a simple key array but swap both Key & Data.
 
D

David Cook

The 'theory' sounds good. But, I changed all the lines to read:
return parseInt((a < b) ? -1 : ((a > b) ? 1 : 0));
but I still get the 'number expected' error intermittently.

This has got to be a known (but unfixed) bug in IE's javascript support.
(I've seen other reports of getting this error but no one has found a
solution.)

If anyone knows a formal way of actually reporting this bug to Microsoft,
I'd like to know how/where to send such a report.

Cheers...

Dave
 
G

Grant Wagner

<url:
http://register.microsoft.com/conta...w.microsoft.com/&RU=http://www.microsoft.com/
/>

Under:

"Product Support"

Click on:

"Contact technical support, ask a product question, report a product bug or
send comments about technical support. "

When I sent a bug report on Internet Explorer I actually received a response
from a human indicating it had been forwarded to the appropriate development
team for review.

They'll take you more seriously if you include as many details as you can and
maybe provide a stripped-down sample page that demonstrates the behavior.

David said:
The 'theory' sounds good. But, I changed all the lines to read:
return parseInt((a < b) ? -1 : ((a > b) ? 1 : 0));
but I still get the 'number expected' error intermittently.

This has got to be a known (but unfixed) bug in IE's javascript support.
(I've seen other reports of getting this error but no one has found a
solution.)

If anyone knows a formal way of actually reporting this bug to Microsoft,
I'd like to know how/where to send such a report.

Cheers...

Dave
Click to expand...

--
| Grant Wagner <[email protected]>

* Client-side Javascript and Netscape 4 DOM Reference available at:
*
http://devedge.netscape.com/library/manuals/2000/javascript/1.3/reference/frames.html

* Internet Explorer DOM Reference available at:
*
http://msdn.microsoft.com/workshop/author/dhtml/reference/dhtml_reference_entry.asp

* Netscape 6/7 DOM Reference available at:
* http://www.mozilla.org/docs/dom/domref/
* Tips for upgrading JavaScript for Netscape 7 / Mozilla
* http://www.mozilla.org/docs/web-developer/upgrade_2.html
 
T

Thomas 'PointedEars' Lahn

David said:
The 'theory' sounds good. But, I changed all the lines to read:
return parseInt((a < b) ? -1 : ((a > b) ? 1 : 0));
Click to expand...

This can be simplified to

return (a < b ? -1 : (a > b ? 1 : 0));

Boolean expressions seldom need to be in parantheses and as the result
of the evaluation of the two nested ternary operations is always an
integer value (i.e. the fractional part of the floating-point number
is 0), it really does not make sense to apply parseInt() to it.
This has got to be a known (but unfixed) bug in IE's javascript
support.
Click to expand...

IE does not support JavaScript, it supports JScript, Microsoft's
ECMAScript implementation. But even if you used the above it
is highly unlikely that it is this line which triggers the error.


PointedEars
 

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