How can I get the parameters from url

Question

I'm writing an aspx to let users check the filename and create a file with that name

the url is

/sites/usitp/_layouts/CreateWebPage.aspx?List=%7b74AB081E-59FB-45A5-876D-
                             284607DA03C6%7d&RootFolder=%3bText=%27SD_RMDS%27

how can I parse the parameter 'Text' and show in the textbox?

<div>
    <asp:TextBox id="Name" runat="server" />
</div>

the aspx text box is this, I tried

<asp:TextBox id="Name" runat="server" text=<%$Request.QueryString['Text']%>></asp:TextBox>>

but it didn't work

anyone can help me out?

Solution 1

To get the value for the http get Parameter:

string testParameter = Request.QueryString["Text"];

then set the Textbox Text

Name.Text = testParameter

Also its strongly suggested to not take Content directly from the url as malicious content could be injected that way into your page. ASP offers some protection from this, still its considered a good practice.

Solution 2

If you want get text value from Querystring you need to use:

var text = (string)Request.QueryString["Text"];

Then you can bind it to Text property of TextBox Name:

 Name.Text = text;

Update: You can initialize you server controls values only on PageLoad event.

Comments

[bowang]

but I wanna write one single line inside the aspx <textbox> tag, any good idea?

[bowang]

thank you! but it didn't work, where can I call the function DataBind()? where can I put this code?

[bowang]

the Name.Text is in the <TextBox> ?

[Kevin Main]

Your TextBox is in your filename.aspx page right? So you should have a code behind file called filename.aspx.cs - in there you by default get a Page_Load function (if not you will have to add this) - add the DataBind() call inside the PageLoad.

[bowang]

how about the Name.Text = Request.QueryString["Text"];? how can I use this?

[Kevin Main]

To do it that way (the recommended way) - ignore everything else above and simply add that one line into the Page_Load method - build it and should now work.

[bowang]

this sharepoint file .aspx is in the Layout folder, how can I find the cs file that controls this? can you help me'

[Th 00 mÄ s]

Could your clarify on "You can initialize you server controls values only on PageLoad event.". I guess i know what you mean but its properly not clear to the OP.

[bowang]

so I just put Name.Text = Request.QueryString["Text"]; in the function Page_Load(), that will work right?

[Kevin Main]

Yes, it is that simple - it is pretty much ASP.NET 101 really. I would suggest you read a few tutorials, watch some videos and maybe get yourself a good book before going much further.

[Kirill Bestemyanov]

Page lifecycle contains next events: PreInit, Init, PreLoad, Load, Control (postback) events, LoadComplete, PreRender, SaveStateComplete, Render, Unload. All events are being catched for specific operations. PageLoad Event is a time when page is stable, it has been initialized and its state has been reconstructed. So it is time to setup values of controls from sources other than control postback events. msdn.microsoft.com/en-us/library/…

[bowang]

that's coooooool! so what should I write in the <TextBox>?

[Th 00 mÄ s]

Thanks for adding that information. Ofcourse methods started from the event "PageLoad" can change controls themself.

[Shadow The Kid Wizard]

@bowang nothing - that's the beauty in this.

[bowang]

oops, I just add the script under the buttom and a run time error happened, something wrong with the js file?(I just added them at the end and did nothing more, even not editing the tag)

[bowang]

sharepoint doesn't allow me to see the .cs code behind it, is there any other way I can do?