ASP.NET

20-Aug-07 5:00

I have a VB variable in an aspx page and want to pass its value to a javascript function within the same page. Any idea how to do this? The variables are read from a database thus:

Dim Lat As Double = CDbl(r("PlaceLat"))
Dim Lng As Double = CDbl(r("PlaceLng"))

and I would like them to be recognised by a google maps javascript line thus:

.
.
var point = new GLatLng(Lat,Lng);
.
.
<\script>

peacefulmember20-Aug-07 6:06

20-Aug-07 6:06

I did it this way after reading variables from database. Do not know if there is another better way.

Dim jsScript As String
jsScript = "jsVar = '" & VBVar & "';"
Dim cs As ClientScriptManager = Page.ClientScript
If (Not cs.IsStartupScriptRegistered("InitJSVar")) Then
   cs.RegisterStartupScript(Page.GetType(), "InitJSVar", jsScript, True)
End If

beish120-Aug-07 6:44

20-Aug-07 6:44

Thanks for this. By doing this code, am I making jsVar available to any javascript on the page so that I can have:

var point = new GLatLng(jsVar,jsVar2);

or do I need to put all the code in the jsScript :

jsScript="" & vbCrLF
jsScript=jsScript & "jsVar = '" & Lat & "';"
jsScript=jsScript & "jsVar2 = '" & Lng & "';"
jsScript=jsScript & "var point = new GLatLng(jsVar,jsVar2);"
jsScript=jsScript & "<\script>"

Will the javascript then run where this is placed:

Dim cs As ClientScriptManager = Page.ClientScript
If (Not cs.IsStartupScriptRegistered("InitJSVar")) Then cs.RegisterStartupScript(Page.GetType(), "InitJSVar", jsScript, True)
End If

peacefulmember20-Aug-07 6:57

20-Aug-07 6:57

Yes, this way jsVar will be availeble on the page, and can be accessed in javascript. Since, this variable is declared on page so, its scope will be page.

In case you have two javascript variables that you want to initialized based on you database value, you will have to follow second approach.

By doing this you are generating javascript code on the server side that will be available on the page once loaded.

HTH

beish120-Aug-07 12:59

20-Aug-07 12:59

This worked perfectly. As I was writing away a marker for each database record read, I had to make the key (InitJSVar) a string so that I could change the key each time a new record was read ie first record = InitJSVar1, second record= InitJSVar2 ...etc

Many thanks

Will give you 5 rating

Michael Sync20-Aug-07 7:09

Michael Sync

20-Aug-07 7:09

As I said here ~

you can use server-side hidden field to communicate between client-side and server-side.

<input id="Hidden1" type="hidden" runat="server"/>

In Form_load
<br />
protected void Page_Load(object sender, EventArgs e)<br />
    {<br />
        Hidden1.Value = "13";<br />
    }
You can set like that..

In Client-side ~
<script language="javascript" type="text/javascript"><br />
      function getvalue(){<br />
        var var1 = document.getElementById('Hidden1').value;<br />
        //do something.<br />
      }<br />
    </script><br />

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

If you want to thank me for my help, please vote my message by clicking one of numbers beside "Rate this message". Why vote? Plz Read it here. Thank you.

beish120-Aug-07 13:01

20-Aug-07 13:01

Thanks for assisting me - I ened up using peacefulmember's solution

Rama Krishna Vavilala20-Aug-07 7:16

Rama Krishna Vavilala

20-Aug-07 7:16

Another Easy option might be to use inline tags. Some people like it some hate it. If you feel that it is cleaner than the other options you can do something like this.

<script type="text/javascript>
.
.
var point = new GLatLng(<%= Lat%>,<%= Lng%>) ;
.
.
</script>

Co-Author ASP.NET AJAX in Action

beish120-Aug-07 13:02

20-Aug-07 13:02

Thanks for your help - I ended up using peacefulmember's solution

Christian Graus20-Aug-07 10:56

Christian Graus

20-Aug-07 10:56

For what it's worth, I believe there's an article somewhere on CP where someone wrapped all this google maps stuff into a control which would do all of this. I didn't actually use it, so it may relate to an older version of the API, but I am pretty sure it exists, it's worth looking into.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Guffa20-Aug-07 10:58

Guffa

20-Aug-07 10:58

You already have a thread about this[^] that you created only a few hours ago, where I already have shown you how to do this. Please keep it in a single thread.

---
single minded; short sighted; long gone;

beish120-Aug-07 13:00

20-Aug-07 13:00

Thanks for taking the time to assist me. I ended up using peacefulMember's solution

How to call 2 javascript function on Page Laod

Guffa20-Aug-07 22:43

Guffa

20-Aug-07 22:43

You should specify the format when you convert the value to a string. His solution only works for floating point numbers if the current culture happens to use period for decimal separator.

---
single minded; short sighted; long gone;

Sandeep Akhare20-Aug-07 4:39

Sandeep Akhare

20-Aug-07 4:39

Hi
i am trying to call 2 different javascript function using
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "OnLoad", "<script>HidePreviousAddressSection()</script>");
and
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "OnLoad", "<script>HideControl()</script>");
But only one javascript function get registered How can we call 2 function as i have to call 2 function after checking some business logic

Thanks and Regards
Sandeep

If If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

Re: How to call 2 javascript function on Page Laod

Talal Sultan20-Aug-07 5:02

Talal Sultan

20-Aug-07 5:02

Can't you put both functions in the same javascript tag?

this.Page.ClientScript.RegisterStartupScript(this.GetType), "OnLoad", "<script>HidePreviousAddressSection();HideControl();</script>");

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"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."
--Rich Cook

Re: How to call 2 javascript function on Page Laod

Guffa20-Aug-07 11:10

Guffa

20-Aug-07 11:10

You can't register two script blocks with the same name. The type and name is used as an identifier for the script, so that different controls can add the same script block without it being repeated.

Just give the blocks different names:

ClientScript.RegisterStartupScript(this.GetType(), "HideAddress", "<script>HidePreviousAddressSection()</script>");<br />
ClientScript.RegisterStartupScript(this.GetType(), "HideControl", "<script>HideControl()</script>");

---
single minded; short sighted; long gone;

Re: How to call 2 javascript function on Page Laod

Sandeep Akhare20-Aug-07 19:23

Sandeep Akhare

20-Aug-07 19:23

Hi Guffa,
Thats why you are called MVP of CP. i really didn't know that 2 paramter is identifier for the script i thought it is the Event after which the script is going to call Wink | ;)

Thanks and Regards
Sandeep

If If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

Access User Control property from Main page

peacefulmember20-Aug-07 4:12

Re: Access User Control property from Main page

20-Aug-07 4:12

Hi,
Got a user control in my master page. I want to access the prperty of user control from the main page. How can I do that?
Thanks

<!-- Master Page -->
<%@ Register TagPrefix="ucl" TagName="myCntrl" Src="~/UCL.ascx" %>
<ucl:myCntrl runat="server" />

<!-- User Control -->
Partial Class UCL
    Inherits System.Web.UI.UserControl
	Priavte x as String = ""
    Public Property ConCatStr() As String
        Get
            Return x & "Color"
        End Get
        Set(ByVal value As String)
            Dim x As String = value
        End Set
    End Property

End Class

<!-- Main Page -->
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
	' Want to refer controls's ConCatStr property on PostBack
End Sub

Talal Sultan20-Aug-07 4:59

Talal Sultan

20-Aug-07 4:59

Hi,

I'll put that down in C# as I'm not really familiar with VB.NET exact syntax, sorry.

In the main page load method:

UserControl myMasterControl = (UserControl)this.Master.FindControl("myCntrl");

string myProperty = myMasterControl.ConCatStr;

Re: Access User Control property from Main page

peacefulmember20-Aug-07 5:59