ASP.NET

Re: How do you create a query string with JavaScript and access the values in Code Behind

15-Mar-10 11:48

Hi
I would like to know how to construct a query string with JavaScript and to then be able to access the passed values in the code behind. Can someone show me how?

Thanks

Abhijit Jana15-Mar-10 12:03

Re: How do you create a query string with JavaScript and access the values in Code Behind

15-Mar-10 12:03

AndyASPVB wrote:
how to construct a query string with JavaScript

What does it mean?

Yes, if are able to create the string, you can save the string in server side hidden field and then can access it from codebehind.

Cheers !
Abhijit
Codeproject MVP

carlecomm15-Mar-10 15:22

carlecomm

15-Mar-10 15:22

Hi,

You can try this:

function QueryString(qs)
{
s = location.href;
s = s.replace("?","?&").split("&");
re = "";
for(i=1;i<s.length;i++)
{
if(s[i].indexOf(qs+"=")==0)
{
re = s[i].replace(qs+"=","");
}
}
return re;
}

then you can do sth to access the pass to anywhere.

modified 27-May-14 4:49am.

Re: How do you create a query string with JavaScript and access the values in Code Behind

Sandeep Mewara15-Mar-10 20:35

Sandeep Mewara

15-Mar-10 20:35

A similar thing is done in XMLHttpRequest...GET method to be more specific!
create a URL with query stings and call it. Access the querystrings using Request.QueryString["QSName"]

Re: How do you create a query string with JavaScript and access the values in Code Behind

AndyASPVB15-Mar-10 23:12

Re: How do you create a query string with JavaScript and access the values in Code Behind

15-Mar-10 23:12

Hi
I am almost there, but I am getting a problem with multiple postbacks. You see, I need to have my javascript function on an asp:panel scrollbar, and in my js, I wrote this:

function scrollPos(position)
{
window.location.href="default.aspx?scrollPos="+position.scrollTop;
}

When I move the scrollbar, the page constantly posts back in an uncontrollable manner, flickering away! How do I stop this, so it is smooth and the page is workable?

Sandeep Mewara16-Mar-10 1:11

Sandeep Mewara

16-Mar-10 1:11

From this reply of yours it looks like you want to maintain scroll position on postbacks. Is that so?
If so, there are other ways simpler ones to do it. Why you thought of querystring?
Have a look at these:
Maintain GridView Scroll Position and Header Inside Update Panel[^]
Maintain Scroll Position in Panel, Div[^]

P.S.: At any time you can update your question or conversation if needed.

Re: How do you create a query string with JavaScript and access the values in Code Behind

AndyASPVB16-Mar-10 2:25

Re: How do you create a query string with JavaScript and access the values in Code Behind

16-Mar-10 2:25

Hi
I have already looked at the maintain scroll bar position and this only works on the browser scroll bar and not on asp:panel. Plus I actually have a number of panels which could all be in different positions, which is why I need to use JS and query strings

AndyASPVB15-Mar-10 23:32

change forecolor of a label in gridview [modified]

15-Mar-10 23:32

Sorry, but just to add, my web page refreshes every few minutes. Therefore, is it possible to have the query string parameters attached to the url then when the page is posted back?

laziale15-Mar-10 9:27

Re: change forecolor of a label in gridview [modified]

15-Mar-10 9:27

Hello -
I want to change the forecolor of a label in a gridview I have, depending on the text in that label.
I can't access the label by the ID in the code-behind to get the properties.
The label is part of templatefield:

<div>
<asp:Label ID="lblFirstName" runat="server" Text='<%#Server.HtmlEncode(Eval("FirstName").ToString())%>'></asp:Label>
</div>

Thx, Laziale

modified on Monday, March 15, 2010 3:54 PM

Brij15-Mar-10 9:35

Brij

15-Mar-10 9:35

You wont get the label just by ID.To change the color, Just find the label in RowDataBound event of gridview and change the style there.
Find the label as

Label lblFirstName= (Label)e.Item.FindControl("lblFirstName");

put this RowDataBound event and modify the style as per your requirement.

Cheers!!
Brij

modified on Tuesday, March 16, 2010 12:54 AM

laziale15-Mar-10 9:47

15-Mar-10 9:47

can you give me some example how I can do ItemDataBound event?

Thanks for your help

Abhijit Jana15-Mar-10 10:02

15-Mar-10 10:02

laziale wrote:
can you give me some example how I can do ItemDataBound event?

I guess this should be RowDataBound. Not ItemDataBound !

Please check the answer that I have posted.

Thanks !

Cheers !
Abhijit
Codeproject MVP

Sandeep Mewara15-Mar-10 10:11

Sandeep Mewara

15-Mar-10 10:11

lets compromise on:
For Gridview its RowDataBound and for DataGrid its ItemDataBound! Smile | :)

Abhijit Jana15-Mar-10 10:14

15-Mar-10 10:14

I don't know if he has made some changes in his original post or not. It may be because Brij asked him to use ItemDataBound
Laugh | :laugh:

Cheers !
Abhijit
Codeproject MVP

laziale15-Mar-10 11:00

15-Mar-10 11:00

I just removed the
<templatefield> and <itemtemplate> tags because of some formatting issue of the site Smile | :)

Brij15-Mar-10 18:21

Brij

15-Mar-10 18:21

There are many data controls in asp.net and and have the different event names .for the same cause Was just a typo Smile | :)

Cheers!!
Brij

Abhijit Jana15-Mar-10 9:51

15-Mar-10 9:51

Please Correct the formatting of your post. Its breaking the page !

Cheers !
Abhijit
Codeproject MVP

Abhijit Jana15-Mar-10 10:01

15-Mar-10 10:01

Try with this :

You need to do this in RowDataBound Event of GridView.

void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
     
      Label lblFirstName= (Label)e.Item.FindControl("lblFirstName");
       if(lblFirstName.Text == "MyText")
             lblFirstName.ForColor=mycolor;
  
    }
}

Cheers !
Abhijit
Codeproject MVP

laziale15-Mar-10 11:06

15-Mar-10 11:06

Thanks for all your help.
I have one question, since I am trying to figure out the color of the label in the page_load event, is there anyway how I can assign the color depending from the text in that label?

Thx, Laziale

Abhijit Jana15-Mar-10 11:17

15-Mar-10 11:17

laziale wrote:
since I am trying to figure out the color of the label in the page_load event, is there anyway how I can assign the color depending from the text in that label?

Why you are trying out in Page_Laod. If you want to check for each and every row of gridview, you need to check it in RowDataBound Event only.

Cheers !
Abhijit
Codeproject MVP

laziale15-Mar-10 11:35

15-Mar-10 11:35

cause I want to display the proper color before the site is rendered on the screen. Is there a way how I can trigger that event in the Page_Load?

Thanks, Laziale

FyreWyrm15-Mar-10 15:39

FyreWyrm

15-Mar-10 15:39

Do you understand the page life cycle? Read about it here[^].

In your page load event you want to set the DataSource property of your grid and call DataBind. Hopefully in your init method you setup an item data bound event handler. When DataBind is called, for each row being added to the gridview your data bound event handler will be called. There you set your colors. After all of that is done, Render gets called for the page which generates all the HTML from your page and code which gets sent to your user's browser.

Don't blame me. I voted for Chuck Norris.

Brij15-Mar-10 18:27

Brij

15-Mar-10 18:27

For changing the color,just change the color in rowdatabound only.It'll suffice your purpose.
After pageload,you must have assigning some datasource.then, your rowdatabound event will be called for each row.In this event,you can modify the color based on the text. After it page will render and your changes will refelct on the screen.

So you dont need to do this at pageload.

Cheers!!
Brij

laziale16-Mar-10 3:14