assignment between jscript variables in a codebehind-created jscri

[RFS666]

Hello,

After I posted yesterday "using C# class in jscript", I have a new problem:
I have a C# class - DBResult - that contains (and other variables) a string
array (and other variables), that contains data from a database query which
is done in C# in codebehind. I create a jscript - script that is injected
into the aspx-page. I need this to fill an activeX-control with data.
I assign the string-array (and - for testing - a single stringArray-Entry)
to variables in jscript. This works. But when I want to reassign these
jscript variables to other jscript variables, these newly assigned variables
only return "undefined" , when I output them via "alert". I have to process
the data in jscript, so I can make it appear in my activeX control (a
2D-graph visualisation)

In Codebehind, I write the following (for testing):

// initialize DBResult for testing:
string[] strings = { "one", "two" };
DBResult res = new DBResult(string s);
// The array is publicly available as a Property named Strings

// create JScript-Code:
string script = "<script language=jscrip t>";
script += "function loadDB() {";
script += "testString s = " + "\"" + res.Strings + "\"" + ";"; // this works!
script += "alert(testStri ngs)"; // returns "System.Str ing[]"
script += "testString = " + "\"" res.Strings[0] + "\"" + ";"; // this works!
script += "alert(testStri ng)"; // returns "one"
script += "s1 = testStrings[0];"; // asignment from jscript variable to
jscript variable
script += "alert(s1)" ; // returns undefined, BUT I DON'T KNOW WHY
script += "return false;"; // verhindert Postback
script += "}";
script += "</script>";

RegisterClientS criptBlock("Blo ck1", script);
this.button1.At tributes.Add("O nClick", "return loadDB();");


I hope I made clear the problem, so I hope somebody can help.

Thanks in advance.

RFS666

[Sreejith Ram]

RE: assignment between jscript variables in a codebehind-created jscri

This is more like a logical issue than asp.net question

The best way to debug would be to do a view source of the page from IE and
see how this line is being rendered

script += "testString = " + "\"" res.Strings[0] + "\"" + ";"; // this works!

looks to me that you are probably assigning a single string to testString ,
not an array ..that could be the reason for following to return 'undefined'..
testStrings[0] doesnt exist, unless testStrings is an array

script += "s1 = testStrings[0];"; // asignment from jscript variable to
script += "alert(s1)" ; // returns undefined, BUT I DON'T KNOW WHY

"RFS666" wrote:
[color=blue]
> Hello,
>
> After I posted yesterday "using C# class in jscript", I have a new problem:
> I have a C# class - DBResult - that contains (and other variables) a string
> array (and other variables), that contains data from a database query which
> is done in C# in codebehind. I create a jscript - script that is injected
> into the aspx-page. I need this to fill an activeX-control with data.
> I assign the string-array (and - for testing - a single stringArray-Entry)
> to variables in jscript. This works. But when I want to reassign these
> jscript variables to other jscript variables, these newly assigned variables
> only return "undefined" , when I output them via "alert". I have to process
> the data in jscript, so I can make it appear in my activeX control (a
> 2D-graph visualisation)
>
> In Codebehind, I write the following (for testing):
>
> // initialize DBResult for testing:
> string[] strings = { "one", "two" };
> DBResult res = new DBResult(string s);
> // The array is publicly available as a Property named Strings
>
> // create JScript-Code:
> string script = "<script language=jscrip t>";
> script += "function loadDB() {";
> script += "testString s = " + "\"" + res.Strings + "\"" + ";"; // this works!
> script += "alert(testStri ngs)"; // returns "System.Str ing[]"
> script += "testString = " + "\"" res.Strings[0] + "\"" + ";"; // this works!
> script += "alert(testStri ng)"; // returns "one"
> script += "s1 = testStrings[0];"; // asignment from jscript variable to
> jscript variable
> script += "alert(s1)" ; // returns undefined, BUT I DON'T KNOW WHY
> script += "return false;"; // verhindert Postback
> script += "}";
> script += "</script>";
>
> RegisterClientS criptBlock("Blo ck1", script);
> this.button1.At tributes.Add("O nClick", "return loadDB();");
>
>
> I hope I made clear the problem, so I hope somebody can help.
>
> Thanks in advance.
>
> RFS666[/color]

[RFS666]

RE: assignment between jscript variables in a codebehind-created jscri

Hello Sreejith,

indeed, I use the page source view for "debugging" :
The line you highlighted really returns a string value, the first string
that is contained in string array of DBResult. This was only for testing. The
code behaves right.
There is a similar line in my example that assigns the complete string-array
of DBResult to a jscript variable:
script += "testString s = " + "\"" + res.Strings + "\"" + ";"; // this works!
In page source view, the variable testStrings contains the following string:
" System.String[]", that means, a string representation of the datatype
(that should be contained in the variable instead!).
But the line
script += "testString = " + "\"" res.Strings[0] + "\"" + ";";
proves that the array can be resolved to its values.
So I don't know why this doesn't work in clean jscript when I write:
script += "s1 = testStrings[0];";

The only thing that could be imaginable (in my opinion) is, that this line
returns the first letter of testStrings, that means the "S" from the string
"System.Obj ect[0]". But this is not
useful. But I don't know why this returns "undefined" .

Hope, somebody can help. Thanks in advance.
Regards

RFS666

The problem lies at an other line:
"Sreejith Ram" wrote:
[color=blue]
> This is more like a logical issue than asp.net question
>
> The best way to debug would be to do a view source of the page from IE and
> see how this line is being rendered
>
> script += "testString = " + "\"" res.Strings[0] + "\"" + ";"; // this works!
>
> looks to me that you are probably assigning a single string to testString ,
> not an array ..that could be the reason for following to return 'undefined'..
> testStrings[0] doesnt exist, unless testStrings is an array
>
> script += "s1 = testStrings[0];"; // asignment from jscript variable to
> script += "alert(s1)" ; // returns undefined, BUT I DON'T KNOW WHY
>
> "RFS666" wrote:
>[color=green]
> > Hello,
> >
> > After I posted yesterday "using C# class in jscript", I have a new problem:
> > I have a C# class - DBResult - that contains (and other variables) a string
> > array (and other variables), that contains data from a database query which
> > is done in C# in codebehind. I create a jscript - script that is injected
> > into the aspx-page. I need this to fill an activeX-control with data.
> > I assign the string-array (and - for testing - a single stringArray-Entry)
> > to variables in jscript. This works. But when I want to reassign these
> > jscript variables to other jscript variables, these newly assigned variables
> > only return "undefined" , when I output them via "alert". I have to process
> > the data in jscript, so I can make it appear in my activeX control (a
> > 2D-graph visualisation)
> >
> > In Codebehind, I write the following (for testing):
> >
> > // initialize DBResult for testing:
> > string[] strings = { "one", "two" };
> > DBResult res = new DBResult(string s);
> > // The array is publicly available as a Property named Strings
> >
> > // create JScript-Code:
> > string script = "<script language=jscrip t>";
> > script += "function loadDB() {";
> > script += "testString s = " + "\"" + res.Strings + "\"" + ";"; // this works!
> > script += "alert(testStri ngs)"; // returns "System.Str ing[]"
> > script += "testString = " + "\"" res.Strings[0] + "\"" + ";"; // this works!
> > script += "alert(testStri ng)"; // returns "one"
> > script += "s1 = testStrings[0];"; // asignment from jscript variable to
> > jscript variable
> > script += "alert(s1)" ; // returns undefined, BUT I DON'T KNOW WHY
> > script += "return false;"; // verhindert Postback
> > script += "}";
> > script += "</script>";
> >
> > RegisterClientS criptBlock("Blo ck1", script);
> > this.button1.At tributes.Add("O nClick", "return loadDB();");
> >
> >
> > I hope I made clear the problem, so I hope somebody can help.
> >
> > Thanks in advance.
> >
> > RFS666[/color][/color]

[Bruce Barker]

Re: assignment between jscript variables in a codebehind-created jscri

lets look at the javascript code generated:

function loadDB()
{
testStrings = "System.Str ing[]";
alert(testStrin gs)";
testString = "one";
alert(testStrin g)";
s1 = testStrings[0];
}

the last line fail because testStrings is not an array, but a simple string
whose value is "System.Str ing[]". thats because the codebehind line

script += "testString s = " + "\"" + res.Strings + "\"" + ";"; // this
works!

called ToString() on res.Strings which returned its type name. you need to
build a javascript array. say:

script += "testString s = {"
string sep = "";
for (int i=0; i < res.String.Leng th; ++i)
{
script += sep + "testString = " + "\"" res.Strings[0] + "\"";
sep = ",";
}
script += "};"

or use the handy builtin feature, RegisterArrayDe claration() to create the
array.

-- bruce (sqlwork.com)


"RFS666" <RFS666@discuss ions.microsoft. com> wrote in message
news:2571C14B-E7CC-4D86-A0CC-41762C7EB10D@mi crosoft.com...[color=blue]
> Hello,
>
> After I posted yesterday "using C# class in jscript", I have a new
> problem:
> I have a C# class - DBResult - that contains (and other variables) a
> string
> array (and other variables), that contains data from a database query
> which
> is done in C# in codebehind. I create a jscript - script that is injected
> into the aspx-page. I need this to fill an activeX-control with data.
> I assign the string-array (and - for testing - a single stringArray-Entry)
> to variables in jscript. This works. But when I want to reassign these
> jscript variables to other jscript variables, these newly assigned
> variables
> only return "undefined" , when I output them via "alert". I have to process
> the data in jscript, so I can make it appear in my activeX control (a
> 2D-graph visualisation)
>
> In Codebehind, I write the following (for testing):
>
> // initialize DBResult for testing:
> string[] strings = { "one", "two" };
> DBResult res = new DBResult(string s);
> // The array is publicly available as a Property named Strings
>
> // create JScript-Code:
> string script = "<script language=jscrip t>";
> script += "function loadDB() {";
> script += "testString s = " + "\"" + res.Strings + "\"" + ";"; // this
> works!
> script += "alert(testStri ngs)"; // returns "System.Str ing[]"
> script += "testString = " + "\"" res.Strings[0] + "\"" + ";"; // this
> works!
> script += "alert(testStri ng)"; // returns "one"
> script += "s1 = testStrings[0];"; // asignment from jscript variable to
> jscript variable
> script += "alert(s1)" ; // returns undefined, BUT I DON'T KNOW WHY
> script += "return false;"; // verhindert Postback
> script += "}";
> script += "</script>";
>
> RegisterClientS criptBlock("Blo ck1", script);
> this.button1.At tributes.Add("O nClick", "return loadDB();");
>
>
> I hope I made clear the problem, so I hope somebody can help.
>
> Thanks in advance.
>
> RFS666[/color]

[Sreejith Ram(MCSD.NET)]

RE: assignment between jscript variables in a codebehind-created j

oh! sorry, i over looked the variable names testStrings & testString

Some thing look at is
When view source, How does the result for this line looks like?

script += "testString s = " + "\"" + res.Strings + "\"" + ";";

When you use res.Strings this way , asp.net renders res.Strings.ToS tring()
which returns the type of it as System.String[] and the HTML output would be
looking like

testStrings = "System.Str ing[]";

Instead, the output should be looking like below for it to be a javascript
array

testStrings = new Array('one', 'two', 'three')

This can be done by building this above string by looping through the
res.Strings array.

script += "var strArray = new Array(")
' add server-side Array Members as to the client-side script
for (intCnt = 0;intCnt < res.Strings.Len gth ;intCnt ++)
{
' If not first element ,put a comma before the next value
if intCnt > 0
script += ","
script += "'" + res.Strings(int Cnt).ToString() + "'"
}
script += ")";

Declaring varaiable script as StrignBuilder would give better performance


"RFS666" wrote:
[color=blue]
> Hello Sreejith,
>
> indeed, I use the page source view for "debugging" :
> The line you highlighted really returns a string value, the first string
> that is contained in string array of DBResult. This was only for testing. The
> code behaves right.
> There is a similar line in my example that assigns the complete string-array
> of DBResult to a jscript variable:
> script += "testString s = " + "\"" + res.Strings + "\"" + ";"; // this works!
> In page source view, the variable testStrings contains the following string:
> " System.String[]", that means, a string representation of the datatype
> (that should be contained in the variable instead!).
> But the line
> script += "testString = " + "\"" res.Strings[0] + "\"" + ";";
> proves that the array can be resolved to its values.
> So I don't know why this doesn't work in clean jscript when I write:
> script += "s1 = testStrings[0];";
>
> The only thing that could be imaginable (in my opinion) is, that this line
> returns the first letter of testStrings, that means the "S" from the string
> "System.Obj ect[0]". But this is not
> useful. But I don't know why this returns "undefined" .
>
> Hope, somebody can help. Thanks in advance.
> Regards
>
> RFS666
>
> The problem lies at an other line:
> "Sreejith Ram" wrote:
>[color=green]
> > This is more like a logical issue than asp.net question
> >
> > The best way to debug would be to do a view source of the page from IE and
> > see how this line is being rendered
> >
> > script += "testString = " + "\"" res.Strings[0] + "\"" + ";"; // this works!
> >
> > looks to me that you are probably assigning a single string to testString ,
> > not an array ..that could be the reason for following to return 'undefined'..
> > testStrings[0] doesnt exist, unless testStrings is an array
> >
> > script += "s1 = testStrings[0];"; // asignment from jscript variable to
> > script += "alert(s1)" ; // returns undefined, BUT I DON'T KNOW WHY
> >
> > "RFS666" wrote:
> >[color=darkred]
> > > Hello,
> > >
> > > After I posted yesterday "using C# class in jscript", I have a new problem:
> > > I have a C# class - DBResult - that contains (and other variables) a string
> > > array (and other variables), that contains data from a database query which
> > > is done in C# in codebehind. I create a jscript - script that is injected
> > > into the aspx-page. I need this to fill an activeX-control with data.
> > > I assign the string-array (and - for testing - a single stringArray-Entry)
> > > to variables in jscript. This works. But when I want to reassign these
> > > jscript variables to other jscript variables, these newly assigned variables
> > > only return "undefined" , when I output them via "alert". I have to process
> > > the data in jscript, so I can make it appear in my activeX control (a
> > > 2D-graph visualisation)
> > >
> > > In Codebehind, I write the following (for testing):
> > >
> > > // initialize DBResult for testing:
> > > string[] strings = { "one", "two" };
> > > DBResult res = new DBResult(string s);
> > > // The array is publicly available as a Property named Strings
> > >
> > > // create JScript-Code:
> > > string script = "<script language=jscrip t>";
> > > script += "function loadDB() {";
> > > script += "testString s = " + "\"" + res.Strings + "\"" + ";"; // this works!
> > > script += "alert(testStri ngs)"; // returns "System.Str ing[]"
> > > script += "testString = " + "\"" res.Strings[0] + "\"" + ";"; // this works!
> > > script += "alert(testStri ng)"; // returns "one"
> > > script += "s1 = testStrings[0];"; // asignment from jscript variable to
> > > jscript variable
> > > script += "alert(s1)" ; // returns undefined, BUT I DON'T KNOW WHY
> > > script += "return false;"; // verhindert Postback
> > > script += "}";
> > > script += "</script>";
> > >
> > > RegisterClientS criptBlock("Blo ck1", script);
> > > this.button1.At tributes.Add("O nClick", "return loadDB();");
> > >
> > >
> > > I hope I made clear the problem, so I hope somebody can help.
> > >
> > > Thanks in advance.
> > >
> > > RFS666[/color][/color][/color]

[intrader]

Re: assignment between jscript variables in a codebehind-created jscri

On Fri, 14 Oct 2005 06:41:04 -0700, RFS666 wrote:
[color=blue]
> Hello,
>
> After I posted yesterday "using C# class in jscript", I have a new problem:
> I have a C# class - DBResult - that contains (and other variables) a string
> array (and other variables), that contains data from a database query which
> is done in C# in codebehind. I create a jscript - script that is injected
> into the aspx-page. I need this to fill an activeX-control with data.
> I assign the string-array (and - for testing - a single stringArray-Entry)
> to variables in jscript. This works. But when I want to reassign these
> jscript variables to other jscript variables, these newly assigned variables
> only return "undefined" , when I output them via "alert". I have to process
> the data in jscript, so I can make it appear in my activeX control (a
> 2D-graph visualisation)
>
> In Codebehind, I write the following (for testing):
>
> // initialize DBResult for testing:
> string[] strings = { "one", "two" };
> DBResult res = new DBResult(string s);
> // The array is publicly available as a Property named Strings
>
> // create JScript-Code:
> string script = "<script language=jscrip t>";
> script += "function loadDB() {";
> script += "testString s = " + "\"" + res.Strings + "\"" + ";"; // this works!
> script += "alert(testStri ngs)"; // returns "System.Str ing[]"
> script += "testString = " + "\"" res.Strings[0] + "\"" + ";"; // this works!
> script += "alert(testStri ng)"; // returns "one"
> script += "s1 = testStrings[0];"; // asignment from jscript variable to
> jscript variable
> script += "alert(s1)" ; // returns undefined, BUT I DON'T KNOW WHY
> script += "return false;"; // verhindert Postback
> script += "}";
> script += "</script>";
>
> RegisterClientS criptBlock("Blo ck1", script);
> this.button1.At tributes.Add("O nClick", "return loadDB();");
>
>
> I hope I made clear the problem, so I hope somebody can help.
>
> Thanks in advance.
>
> RFS666[/color]
I would render script code to initialize a jscript array via an array
literal: var myJscriptArray = ['first','second '...];
You must dynamically build this array.
There is a lot of interesting code that deals with similar issues in
Ajax.net where they support a number of classes downloaded to the client.

[RFS666]

RE: assignment between jscript...

Hello,
now, the code works.
I dynamically created the array in a loop as proposed!

Thanks to all who posted! Please keep up the good work in providing such
helpful
examples!

Regards

RFS666