Web Development

DataGrid inconsistent after sorting

25-Jun-07 21:54

Check out this Ultimate Testing Checklist:

http://www.sitepoint.com/article/ultimate-testing-checklist[^]

Vasudevan Deepak Kumar
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Allad25-Jun-07 11:46

Allad

25-Jun-07 11:46

Hi,
I am working on a simple web application. The goal is to emulate a (very)simple file explorer. So, given a directory path on the server machine, the app displays all child files. I am using a WebUI.DataGrid control to displays the files and some related information (full path, size, creation date...). Moreover the app allows to sort the files according to their names or their size and a click on a file name is supposed to take you to the page representing that file.
However I am having some trouble with the sorting. To sort the datagrid, I first retrieve the DataTable which it is bound to and then pass it to a DataView object. Then, I call the DataView.Sort property then I bind back that dataview to my DataGrid object. Although, VISUALLY, the files are really sorted, the links they point to is just the same as when they were not sorted. So for instance, clicking a directory named "Eclipse" actually takes you to the directory "Code" which was occupying the same row before the sorting.
Is there a way to solve that inconsistency of the DataGrid control?
Thank you very much by advance.

Cheers,
Cherif

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Vasudevan Deepak Kumar25-Jun-07 22:02

25-Jun-07 22:02

Does PostBack and DataBinding interfering with each other?

Vasudevan Deepak Kumar
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Allad26-Jun-07 0:59

Allad

26-Jun-07 0:59

Hi,
Thanks a lot for replying. However, I am no .Net Web development expert. How can I tell whether Postback and DataBinding are interefering with each other or not?

Thanks.

Allad

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Vasudevan Deepak Kumar26-Jun-07 2:09

26-Jun-07 2:09

After postback, check for IsPostback to ensure that the grid is resurrected from its ViewState instead of duplicate databinding. The flow should also be checked so that it goes to event handlers appropriately.

Vasudevan Deepak Kumar
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If...Then... Else based upon QueryString

Allad26-Jun-07 4:30

Allad

26-Jun-07 4:30

Thanks so much. It was really a duplicate databinding issue. Now I am checking the IsPostBack property prior to binding any values.

Cheers,
Allad

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sduffield25-Jun-07 11:05

sduffield

25-Jun-07 11:05

I am trying to display an image. Depending, though, on a test of the QueryString you'll get one of two images. This is what I've come up with so far.
<pre>
<% if Request.QueryString("section") = "statebooks" then
Response.Write(<img src="redesign/images/index_27a.jpg" width="685" height="47" alt ="">)
elseif Request.QueryString("section") = "directory" then
Response.Write(<img src="redesign/images/index_27a.jpg" width="685" height="47" alt ="">)
else
Response.Write(<img src="redesign/images/index_27.jpg" width="685" height="47" alt ="">)
end if
%>
</pre>

Am I even close? Any help would be much appreciated.
Thank you.

sduffield

Re: If...Then... Else based upon QueryString

Fred_Smith25-Jun-07 11:58

Fred_Smith

25-Jun-07 11:58

Close, but no cigar....

The Response.Write method needs a string (to write...), eg:

Response.Write("Hello")

So for starters you need to enclose what you want to write to the page in quote marks.

To avoid the problem of your string including it's own quotes, you need to double them up - so you end up with:

if Request.QueryString("section") = "statebooks" then
Response.Write("<img src=""redesign/images/index_27a.jpg"" width=""685"" height=""47"" alt ="""">")
elseif Request.QueryString("section") = "directory" then
Response.Write("<img src=""redesign/images/index_27a.jpg"" width=""685"" height=""47"" alt ="""">")
else
Response.Write("<img src=""redesign/images/index_27.jpg"" width=""685"" height=""47"" alt ="""">")
end if

cheers
Fred

Re: If...Then... Else based upon QueryString

sduffield26-Jun-07 3:13

sduffield

26-Jun-07 3:13

Thank you, Fred. I really appreciate your help! Actually, I am shocked that I was that close.

sduffield

Re: If...Then... Else based upon QueryString

Fred_Smith26-Jun-07 3:15

Fred_Smith

26-Jun-07 3:15

javascript form.reset() issue after the postback of an asp.net page

Ken.A25-Jun-07 8:11

Re: javascript form.reset() issue after the postback of an asp.net page

25-Jun-07 8:11

hi. i have a simple page with some textboxes, a submit button and a client-side reset button.

1. for this first scenario, i fill the textboxes and the reset button works fine in case i click on it

2. for the second scenario, after i filled the form, i submit it and after the postback, since it's an aspnet page
i have the textboxes filled ... in case i click the reset button the textboxes will not be cleared, but it will be
reset to the previous values, because now the reset will 'think' that the original values are not the empty ones,
but the ones i have filled the form

note: i also set the enableviewstate=false to the textboxes
note: if i do a server.transfer then i have the textboxes cleared, but this is no option, since after the submit i show a message in the page, plus i don't want to postback a page just to clear the form elements
note: i reset the form elements with the following code:

1
2 function ResetForm()
3 {
4 var formId = <%= "'" + Form.ClientID + "'" %>;
5 document.forms[formId].reset();
6 }
7

someone may say to use a javascript code to look for the form elements i want to reset and set its values to empty, but again why? since i have a built-in reset method

so, as far as my understanding goes, form.reset, reset form fields to its original values, not necessarily empty values ... after the postback, the original form values will be the ones i had filled in, like in the second scenario example.

any tips on how to properly reset this form?

»»» KenA

badgrs25-Jun-07 9:57

badgrs

25-Jun-07 9:57

It resets your values after the postback since the html returned has value="your value" for each field, so the reset uses these values (which are empty on the first request)...but anyway you already got that far.

Why are you using javascript for the reset in the first place? Why not use ?

Since the values are 'hard-coded' (in the html) upon a postback, javascript is your only option. Heres a simple function that should work:

<br />
function ResetForm()<br />
{<br />
var inputs = document.getElementsByTagName("input");<br />
for(var i = 0; i < inputs.length; i++)<br />
{<br />
inputs[i].value = "";<br />
}<br />
}<br />

I haven't tested the function and it will only reset input elements (ie not select).

Re: javascript form.reset() issue after the postback of an asp.net page

Ken.A25-Jun-07 10:24

Re: javascript form.reset() issue after the postback of an asp.net page

25-Jun-07 10:24

badgrs wrote:
Why are you using javascript for the reset in the first place? Why not use ?

hi ... the reason i'm not using the type="reset" is because i also call another js Page_ClientValidate(); in order to clear any eventual error msg previously displayed in case the user has done some bad format input, other than this i would use your idea.

badgrs wrote:
Since the values are 'hard-coded' (in the html) upon a postback, javascript is your only option.

ow, that's what i was afraid of ... but if js is my only option, this leads to the following conclusion: for asp.net pages it's useless to call form.reset or the input type="reset" tag since it will only work before postbacks, plus i will also have to manually track all forms elements i'm eventually using in the webpage, not just input fields, but select fields, option, etc as well

what is important to notice is that the built-in form[].reset() goal is really to 'reset' form values to its original values and NOT to clear all form fields, unless the initial values are empty ones!!!

but then a doubt raises: isn't asp.net breaking the rules by maintaining form field values after a postback? one of the great things when asp.net brought was keeping form values after a postback, but now i can't use one of the most basic things in html???

»»» KenA

Vasudevan Deepak Kumar25-Jun-07 22:06

Re: javascript form.reset() issue after the postback of an asp.net page

25-Jun-07 22:06

Ken.A wrote:
pages it's useless to call form.reset or the input type="reset" tag since it will only work before postbacks, plus i will also have to manually track all forms elements i'm eventually using in the webpage, not just input fields, but select fields, option, etc as well

Check out the related thread in the message whose permalink is here: http://www.codeproject.com/script/comments/forums.asp?msg=2099807&forumid=1640#xx2099807xx[^]

Ken.A wrote:
isn't asp.net breaking the rules by maintaining form field values after a postback?

ViewState has the advantage of resurrecting the form values after the roundtrip. Perhaps in your perspective, it is a double-edged sword. Smile | :)

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

Vasudevan Deepak Kumar25-Jun-07 22:04

Re: javascript form.reset() issue after the postback of an asp.net page

25-Jun-07 22:04

badgrs wrote:
Since the values are 'hard-coded' (in the html) upon a postback, javascript is your only option.

True.

badgrs wrote:
function ResetForm()
{
var inputs = document.getElementsByTagName("input");
for(var i = 0; i < inputs.length; i++)
{
inputs[i].value = "";
}
}

Additionally, you may need to accomodate TEXTAREA tags. For Select tags, you can set selectedIndex to -1.

Vasudevan Deepak Kumar
Personal Homepage
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Ken.A26-Jun-07 5:54

Re: javascript form.reset() issue after the postback of an asp.net page

26-Jun-07 5:54

ok ... but your ResetForm() method is too generic ... it will reset all inputs in my webform, eg: type="submit", type"option", etc ... i just want to reset type="text" ... looping through all the input attributes until i find one with type="text" to clear its value ... hum, is there a better way?

»»» KenA

Ken.A26-Jun-07 9:56

26-Jun-07 9:56

a better ResetForm method could be something like:

<br />
function ResetFormByTagName( tagName, hasValidators )<br />
{<br />
  var arrTags = document.getElementsByTagName( tagName );<br />
  for( var i=0; i<arrTags.length; i++ )<br />
  {<br />
    if( arrTags[i].type=="text" || arrTags[i].type=="password" )<br />
      arrTags[i].value = "";<br />
<br />
    //continue here for other input types: checkboxes, selects, etc<br />
  }<br />
  <br />
  //after your clear form values then page_clientvalidate will clear any existing error msgs<br />
  //but just use it in case you have validators in your page<br />
  if( hasValidators==true )<br />
    Page_ClientValidate();<br />
}<br />

»»» KenA

transparency on IE

xxrono25-Jun-07 3:54

xxrono

25-Jun-07 3:54

hey there

i use transparent canvas on my pics ,in order to use a fine background template i made

in mozilla everything is great (again) but in IE(6) i get a gray img bgrnd ,that covers up the page backround

i use fireworks 8 for image editing

Is there a body{} or html{} css rule that will solve this problem

thanks
(i hope i'm in the right message board for this)

P.

ninja coding

Re: transparency on IE

Vasudevan Deepak Kumar25-Jun-07 5:28

Stylesheet Problem in IE 7

25-Jun-07 5:28

Check out this IEBlog Post:

http://blogs.msdn.com/ie/archive/2005/04/26/412263.aspx[^]

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

Re: transparency on IE

Shog⁹25-Jun-07 6:58

Shog⁹

25-Jun-07 6:58

If you need something that will work on IE6 and IE7, check out the progid:DXImageTransform.Microsoft.gradient() filter. You can set both starting and ending colors to whatever you want the background to be, and use the alpha component of the color values to achieve transparency.

And yeah, there's an actual opacity() filter as well... but the results look awful.

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Sachin Pimpale25-Jun-07 3:35

Sachin Pimpale

25-Jun-07 3:35

Hello all
i am working with web site its style sheet does not give proper reuult in IE7 , Previously i was working with IE6 in which it works Properly.
(it works Proper in Opera, Netscap, Mozila PROBLEM is Only when i run that in IE7)

SP
--
Bugs can neither be created nor be removed from software by a developer. They can only be converted from one form to another. The total number of bugs in the software always remain constant.

Re: Stylesheet Problem in IE 7

Vasudevan Deepak Kumar25-Jun-07 5:27

Image caching, IE7 problem!

25-Jun-07 5:27

Any particular style definition you would like to quote that is breaking in IE 7?

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

ErikZ25-Jun-07 3:05

ErikZ

25-Jun-07 3:05

Hi,

I have a page that reads an image from another aspx-file. The image is generated on the fly using GDI+.
A javascript in the main page refreshes the image at a regular interval.

This works great in IE6, but in IE7 the image is only loaded the first time. If I refresh the page the image is loaded again, but only once.
To me, this is a cachingproblem in IE7...but I have no idea how to fix it.

Does anybody know how to fix this?

Re: Image caching, IE7 problem!

Vasudevan Deepak Kumar25-Jun-07 5:26