Eval() Delivers Incorrect Results?
Sep 27, 2006
I noticed weird results when using eval() to do some simple calculations. Here are a few eval() statements and the corresponding results from javascript:
eval("1.2+0.97") =2.17
eval("1.2+0.98") =2.1799999999999997
eval("1.2+0.99") =2.19
eval("1.2+0.981") =2.181
This can happen with other numbers as well, but certainly not with any combination. I have confirmed this on Firefox and Safari, two different versions of OS X and both Intel and PowerPC Macs.
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Aug 24, 2009
I am pulling in an XML doc, storing it in a global var and through out the app I am transversing it to grab certain info. Up till 1.2.6 it's been working fine, but when I upgraded 1.3.2 I get bad results.
Here are my two test pages:
[URL]
My guess is the it has something to do with Sizzle but I can't place exactly where the issue may be happening.
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Apr 21, 2010
I'm just getting into jquery and was testing to see how I could handle php/mysql errors on my ajax function page. I thought that if I set the datatype to xml and since the error page was html it would throw an error but it doesn't. How can I handle this?
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Oct 30, 2009
I'm developing a chess game recorder (records chess games just like electronic score sheet) and i am trying to write a function that handles the "en passent" rule in chess. However, when i try to test to see if a Black pawn is at a particular x,y location, it is always giving me back "50px". Even when it's not at that location. i uploaded semi-live version to my website here: [URL] you just click on the 'Play' button to start the game here's the function in question:
[Code]..
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Oct 19, 2010
However, I finally ran into a problem that I can't figure out. When I try and get the width of any cell in a table it's returning a width of 83 or 84. I have the table inside a div that has a width of 757px. I don't have a width set on the table itself, but each cell is set to 100px. I've tried to set the width in a css file and inline neither of which give me the 100px that I'm thinking it should return. I've tried both width(), outerWidth() and innerWidth(). The only one that returns a different number is outerWidth.
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Dec 22, 2011
I have a global variable that I change depending on what's going on in screen.
And that function changes that variable.
For some reason, in FF, it modifies the variable as expected. But in Chrome, it doesn't.
Why is this? Is there any way to have consistent behaviour in both browsers?
In fact:
Returns true in FF, but false in Chrome...
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Oct 4, 2010
Does anyone know of a place to get a code that looks at what is typed in a textbox and displays a green checkmark or a red x next to the textbox if the value entered is invalid. Eg. if no @ is entered in the email field, a red x would be shown next to the email field. Eg. if a zip code contains letters, a red x would be shown next to the zip code field. Eg. if the email field contains a @ and a period, a green check would be shown next to the email field. Etc. The green check or red x would have to be shown either as the user is typing or after they go to the next field (Blur).
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Oct 11, 2011
i am using this script
Code:
<script type="text/javascript">
$(document).ready(function() {
for ($i=0; $i<4; $i++) {
var num = $('.clonedInput').length;
var newNum = new Number(num + 1);
[Code]...
all works well, less one thing. The id names of valores are incorrect in the last loop.
[Code]....
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Apr 10, 2009
I should imagine others here have experienced it. The user completes your form, and they unintentionally input their email address incorrectly. Then when you reply to their form, you then get the mailer daemon returning your email! Now, there's a couple of ways that some websites try to solve this problem - some ask the user to input their email address twice, some show the forms results on the next page, so that the user has a last chance to check, before completing the submission. Are there any other ways of trying to ensure that, as much as possible, that the user inputs the correct email address?
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Aug 5, 2011
Im working on some drag and drop logic similar to the jQuery shopping cart example, but I've run into a small hitch. If I double click on the LI within my 'dropped' area it causes them to become draggable again. I specifically set up drag to only work from one source list, so Im unsure how double clicking is causing this bug?
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Apr 18, 2010
I think the offset() function returns node's position relative to document. The attached html file prints the offset value to console when the box is clicked. I expect the same value would be printed every times. However, when the script is run on iPad (with simulator), it print different value when I zoom and scroll to different position. This problem does not occurred in iPhone.
Attachments
test.html.gz
Size : 388 Bytes
Download : 505
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May 7, 2010
I am FAR FROM BEING KNOWLEDGEABLE about javascript. On my web page, I want to have a slideshow run that'll show small-ish versions of images. I don't want the whole thing re-displaying every time, so I put together a little javascript to figure out how to show the images.....
I have one ALERT in here to show me the dimensions of the window and the image, and I'm getting one or more values coming up as "0"...... Which means that image doesn't display. The image(s) are NOT zero width or height, and neither is the window..
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
[Code].....
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Oct 31, 2011
I have the following few snippets of code:
JS:
Code:
$(function() {
$('.delCatButton').live('click', function(e) {
e.preventDefault();
var cat_name = this.title;
var delCatFormID = $("#delCatFormID").val();
[Code]...
The $_SESSION['delCatFormID'] variable in the process.php page is incorrect, and never equals the posted variable.
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May 28, 2010
jquery width() and height() functions are consistently returning the wrong values for the viewport size (i.e. $(window).width). Anyone know why..or what I can do to fix it?
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Apr 28, 2011
I have a list of links to PDF articles, each link has a corresponding div that contains an introduction to the article. I'm using the onmouseover event in each link to show the corresponding introduction div and hide all the others.
The order and number of the pdf links and the introductory divs are the same. The code below works in IE but not in FireFox - the problem in FF is the index returned from the onmouseover event is double what it should be, so the first PDF link shows the second div, the second PDF link shows the fourth div ect.
javascript:
Code:
css:
HTML Code:
html:
HTML Code:
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Dec 13, 2007
I'm using height() and width() to find the dimensions of some inline images in the html. FF and IE work fine, but Opera is returning incorrect values. For example, it returns 92px as the width of an image that is actually 160px wide. How can I fix this?
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Jul 23, 2005
given that I have a js file included which is written programatically and I
can't change it. I would like to know how to do the following using
something other than the deprecated eval().
whats in the js file
var numArrays=something;
var data0 = new Array();
data0.name="name";
data0.data="some data";
var data1 = new Array();
data1.name="another name";
data1.data="some more data";
etc ....
function getData(arrayName) {
for ( var i=0;i<numArrays:i++) {
var el=eval('data'+i);
if (arrayName = = el.name) doSomething(el.data);
}}
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Jul 23, 2005
var fns = ['orde', 'no', 'kml', 'snf', 'td', 'ty', 'tn', ...up to 21
elms...];
var snv = new Array();
var vals = new Array();
for (i = 0; i < N; i++) {
for (j = 0; j < fns.length; j++)
vals[j] = some value;
snv[i] = new makeData(vals);
}
function makeData(vals) {
for (k = 0; k < vals.length; k++)
//the following line doesn't work
eval("this."+fns[k]+"="+vals[k]);
//neither this one
this.eval(fns[k]) = vals[k]);
}
how can i make it without writing it the long way:
this.orde = vals[0];
this.no = vals[1];
this.kml = vals[2];
and so on?
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Nov 16, 2006
how comes the following doesnt work
fieldNotes2=eval("Message.notes["+id2+"]");
i believe it's because of the [] but i need to keep them!
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Jan 28, 2004
I've made a funny program using eval()...it will let the person(on the page) to write javascript and have it compile(if thats the right word for it)! its quite cool, i dont know how handy it might be, but here it is none the less...
code:
<html>
<head>
<title>test</title>
<script language="JavaScript">
function submitCode(){
var the_code = window.document.form_1.textarea_1.value;
var run_the_code=eval(the_code);
}
</script>
</head>
<body>
<center>
<h1>write some code!</h1>
<form name="form_1">
<textarea name="textarea_1" rows=10 cols=40>
</textarea>
</form>
<form onSubmit="return false;">
<input type="submit" value="submit your code" onClick="submitCode();">
</form>
</center>
</body>
</html>
very simple stuff, but for those of you who are unfamilir with eval, its pretty cool, huh?
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Aug 23, 2005
I'm having some weird problem with evaluating the continue statement.
Within a for loop I'm trying to evaluate a string (generated somewhere
earlier) which basically has the continue statement in it. IE6 seems to
have major problems with that as it generates an error "Can't have
'continue' outside of loop". Does anyone know why and/or have a
workaround? I haven't tried any other browser since this one is the
only one available (company policy).
I have included some code to reproduce this behaviour. The first and
second if statements of the testeval function behave as expected. The
third one however produces the mentionned error. Code:
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Feb 2, 2006
I am trying to do the following but i get an error, is there no way i
can use eval to print have it assigned to a predeterminded variable.
eval (object_name + "_CalCalendar") = new CalendarPopup(object_name);
Cannot assign to function result.
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Apr 17, 2006
Here is my code.
function CallDisplay()
{
nodeobj=new mynode();
x="displayId("+nodeobj+")";
eval(x);
}
function displayId(node)
{
alert(node.myid);
}
function mynode()
{
this.myid="aa";
}
In CallDisplay() I am getting the error as "Microsoft JScript
Compilation error ']' expected". Any one can suggest me how to
overcome this.
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Aug 30, 2006
I'm running some javascript over a server side generated web page
and have multiple generated empty select statements, that I want to
populate when the page is loaded. As HTML doesn't do arrays each
select is individually named withe MySelecti where i is an incremental
from 1.
I know all my variables are correct (i, OptionsCount) and my arrays
of MyValues and MyDescription's exist for multiple enteries and if I
bring out an example of what I thought each line would eval too( say
document.MyForm.MySelect1.options[1]=new
Option('Value1','Description1') the line works fine, for the life of me
(i'm sure I'm missing something obvious) the eval line won't eval..
for(i = 1; i<=row; i++) {
for (j = 1; j <=OptionsCount; j++) {
eval="document.MyForm.MySelect"+i+".options["+j+"]=new
Option('"+MyValues[j]+"', '"+MyDescription[j]+"')";
eval(eval);
}
}
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Nov 23, 2006
I am trying to assign an "onclick" event to a dynamically-created DOM
element (an image).
I have read countless times that "eval()" is to be avoided at all costs.
However, I cannot seem to get my new onclick to work without it.
Here's what I have so far:
myeval = 'detachFile(this);'
detachImage = getElementById('detach-jfhahhf');
detachImage.onclick = function() { eval(myeval) }
This works perfectly fine for me, but this is a web-app that will be
exposed to public users, and I obviously don't want them being able to
eval anything if i can help it.
Can that be done without the eval()?
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Sep 8, 2002
i came up with the following, to help me test the syntax of functions while i'm writing them. i've only been using it for a day or two, but so far, it's been really handy.
<HTML>
<HEAD>
<TITLE>Evaluator</TITLE>
<META HTTP-EQUIV="Content-Script-Type" CONTENT="text/javascript">
</HEAD>
<BODY>
<FORM>
<TABLE WIDTH="100%" HEIGHT="100%">
<TR>
<TD COLSPAN="2" HEIGHT="100%"><TEXTAREA NAME="script" STYLE="width: 100%; height: 100%"></TEXTAREA></TD>
</TR>
<TR>
<TD ALIGN="CENTER"><INPUT TYPE="BUTTON" VALUE="eval" OnClick="eval(this.form.script.value);"></TD>
<TD ALIGN="CENTER"><INPUT TYPE="RESET" VALUE="clear"></TD>
</TR>
</TABLE>
</FORM>
</BODY>
</HTML>
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