C# - JavaScript: How To Surround An Auto Generated JavaScript Block With Try/catch Statement
Jan 17, 2011
In the Script documents that asp.net automatically generates how can I surround the whole generated scripts with try/catch statement to avoid 'Microsoft JScript Compilation error'
My issue is: i got a DevExpress control (ASPxGridView) that added and set-up in run time, since i activated the grouping functionality in the grid I still get JS error says ';' expected whenever i use (click) on one of grouping/sorting abilities, I activated script Debugging for IE, in the JS code turns out that there is no missing ';' and once i click ignore for the error msg that VS generates every thing works fine, and surly end-user can't see this msg so i figured out if i try/catch the script that may help avoid this error.
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Jun 10, 2010
Since everyone yells at me that MessageBox doesn't work when the project is uploaded to the server, I need to migrate to javascript alert box. As I was changing my MessageBoxes, I tested and found that they weren't being produced. I'm not sure if it matters, but they are in a try/catch block, which is shown here:[Code]....
This all worked before when I had MessageBox - it showed, then the page redirected when I clicked Ok.
I either don't understand how try/catch works, the javascript isn't adding, or Response.Redirect is executed before I can see the alert box and click Ok on it.
(just as a note, everything works fine, but the alert box doesn't show)........if I add the (javascript) code before the try block, the alert box comes up, so it's not something wrong with the writing of the javascript or executing it at least (I think).
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Oct 22, 2010
I am trying to call a JavaScript function from my ascx control code behind in the catch blockI have tried the below two ways but they don't seem to work.
Page.ClientScript.RegisterClientScriptBlock(typeof(string), "script", "test();", true);
ScriptManager.RegisterStartupScript(Page, GetType(), "err_msg", "alert('error');", true);
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Jun 6, 2010
I'm new to ASP.net 3.5 and creating a test web site. I have created a master page for my web site with page content blocks. Now I want to use some javascript on the client side to provide for more interaction. I would normally create page specific Javascript functions and insert them in a <script block on the page. Howevere the Javascript script block must be placed before the <HTLM block. If I'm using Master Pages, it doesn't seem that I can use page specific Javascript functions. How can I resolve this problem? I think my options are
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Dec 9, 2010
If I have an array variable singletext with javascript code like below
[code]...
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Nov 20, 2010
This is a problem I'm facing in a webapp I'm currently working on. So instead of cluttering the question with unrelated code, I recreated the problem in an isolated, simplified webapp that only demonstrates this issue.
I have a web user control with just this as its content:
<% if (ShowAlertScript)
{ %>
<script type="text/javascript">
function AlertMe()
{
alert('Hello World!');
}
</script>
<% } %>
<input type="button" onclick="AlertMe()" value="Say Hello" />
And its codebehind has nothing more than the boolean definition of ShowAlertScript. This represents a control I have in the big webapp that has two modes: input mode, and display mode. When in input mode, it has a large javascript block that is only useful then; it does some cool stuff to help the user input the info.The way this control is laid out in the big picture is as follows:
<asp:ScriptManager runat="server" />
<asp:UpdatePanel runat="server">
<ContentTemplate>
<asp:MultiView ActiveViewIndex="0" runat="server" ID="mvw">
<asp:View runat="server">
<asp:Button runat="server" ID="btnSwitch"
OnClick="btnSwitch_Click" Text="Switch" />
</asp:View>
<asp:View runat="server">
<uc:MyInputControl runat="server" ID="micInput" ShowAlertScript="true" />
</asp:View>
</asp:MultiView>
</ContentTemplate>
</asp:UpdatePanel>
When you click btnSwitch, it simply switches to the second view with the user control. Notice how I have the ShowAlertScript already initialized to true. The potential output is that since I'm "showing the alert script" within the user control, the AlertMe() function will execute when you click the input-button element, because it's written out according to the inline if statement.
If you run this code I gave you so far as is, it will not work. The browser will say it can't see the AlertMe() function; it's undefined as far as it knows. But if you take out the UpdatePanel (or disable the ScriptManager's partial rendering), it will work just fine on a full postback when you click btnSwitch.
I want it to work on a partial postback, because this whole thing is a small piece compared to the rest of the page, and I don't want to do a full postback every time they switch views. Apparently, the ScriptManager doesn't even bother re-rendering the ascx file for possible changes. Either the ScriptManager is not smart enough, or there is an option I'm missing to let it render the <script> so I can invoke its methods on the client side. A potential answer someone might suggest is "why don't you take out the javascript, put it in its own .js file, and have the page reference it so it's available to the control?"
That won't really work with me, because the script block does some initialization and modification that pertain to that single control instance, not to all others on the page.
In turn, you might also be concerned that if I have more than one instance of the control, I end up with copies of the same script. Not really; there will only be ONE input mode of this control in a page at any given time, it's just that I have those two modes in two separate views and I let the user switch between them.
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Dec 18, 2010
What is the trick to doing error trapping with javascript and Ajax controls in a VB.net page?
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Nov 4, 2010
I have an asp.net control that contains a grid view sitting on top of an Ajax update panel. The control has been added to a sharepoint page. When a button is clicked, some server code is called to store the contents of the grid. If the server code throws an error, I want to spit out a javascript alert displaying the error message, but for some reason the error that bubbles up from the server is the generic 500 server error, which doesn't contain any details of the original error.
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Aug 13, 2010
I have js script block (very long one that does editing capabilities to an invoice page).
I want to enable/disable this functionality on the server-side. First thing popped up on my mind was to say runat="server" to the tag, and set visible=true/false to asp.net, thinking asp.net does not render the HTML for non-visible items, so the block wouldn't load at all, which was what I wanted. But I quickly realized that saying runat="server" to client-side code was a real bad idea :)
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Mar 9, 2010
I have a "database explorer" page that is desgined to be pointed to an unknown database and allow users to browse the data, so it basically uses the SQL system tables to develop its queries and pull in data to tables using auto-generate columns.The problem that I have is that I would like certain types of columns to have certain formats and I'm wondering the best way to go about it. I could format the column in code in the RowDataBound event I assume, but I'm wondering if there some better standard way to do this? Is there a setting of any kind that I can use? For example I want all of the datetime fields to be formated for short date, like {0:d}, I want decimal fields to have 4 decimal places, etc.
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Jan 21, 2010
I have tried this on two different controller methods now, and both times, even if the linq2sql doesn't allow the data to be saved, the code never jumps into the catch block.
I've watched the noun object in the middle of the trace, and the isvalid property is false, but the modelstate isvalid is true. Either way, the code never jumps into the catch block.I'm pulling my hair out about this. I feel like it will be something really silly.
The code all works similar to nerd dinner.
NounRepository nounRepository = new NounRepository();
Noun noun = new Noun();
try[code]...
I'd rather not have to add code in this manner though, as it seems like an unnecessary duplication.
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Aug 31, 2010
I have to call the function, when exception occured. Is it possible to call the function in Catch block (Try-Catch)? I have tried it but the function did not get invoked. What i have to do for it? Shall we unable to call the functions in Catch block? I have shown my code below.
Try
Catch ex As Exception
ErrorHandlers.LogErrorDetails(ex, Session("UserId").ToString, "")
Throw ex
End Try.
I knew, We can invoke this function in Finally block but i do not need as per my requirements.
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Mar 31, 2010
When to write try catch block?
Should I write it for each method or only in event handlers or ????
What happens when an exception occurrs? What is the stack for exception?
If I use it at entry point (event handlers) then how do I get actually at which line error occurred?
Suppose an exception was thrown from Data Access Layer How do I get it in presentation layer that exactly in which class method at which line why that error occurred?
Is it true that excessive use of try catch makes application slow?
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Jul 22, 2010
i have the following code which show error from a string when there is a error
is there any way that i can make this in catch block?
main()
{
try
{
if (a==1)[code].....
Like below:i have the following code which show error from a string when there is a error
is there any way that i can make this in catch block?
main()
{
try[code]....
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Aug 13, 2010
Possible Duplicate:
Performance Cost Of ‘try’
I am being told that adding a try catch block adds major performance cost in the order of 1000 times slower than without, in the example of a for loop of a million. Is this true?
Isn't it best to use try catch block as much as possible?
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Apr 29, 2010
Can somebody show me a better approach of looping through a Try -Catch statement. I have something like this:
Try
dbConn.Open()
Catch ex As Exception
errmsg = ex.Message
End Try
I need to try to connect 5 times before logging an error. My first thought was to nest Try - Catch 5 levels but I didn't like that idea. I'm sure there is better solution to it.
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Feb 9, 2010
is final run if htere is a return in catch blobk ?
example
try{
}catch(){[code]....
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Mar 14, 2010
In ASP.NET, when you give a tag an ID it generates a unique HTML id for the element based on the control hierachy, ie.
<asp:Panel ID="test" runat="server">
...
</asp:Panel>
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<div id="plc_lt_zoneContent_PagePlaceholder_PagePlaceholder_lt_test_test">
...
</div>
Is there some way of determining the generated id in the codebehind file? I need to generate some Javascript that uses the id.
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Apr 2, 2010
I wrote a stored procedure call with the format:
bool isValid=true;
using (OracleConnection myConn = new OracleConnection(connectionString))
{
OracleCommand myCmd = new OracleCommand("sproc", myConn);
myCmd.CommandType = CommandType.StoredProcedure;
myCmd.Parameters.AddWithValue("p1", a1);[code].....
Second format just doesn't feel right but I am not that experienced. I am curious if there is any downfall to that other than exception not being type specific.
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May 23, 2010
How/Can I Set the try, catch statment to catch a specific Error. For example i am getting the following error:
Exception Details: System.Data.SqlClient.SqlException: Incorrect syntax near '='., [SqlException (0x80131904): Incorrect syntax near '='.]
Basicly The = is part of my SQL string which points to a table that currently doesent exist. I want something like catch ex as SqlException (0x80131904) or catch ex as SqlException = "0x80131904" or even catch ex as System.Data.SqlClient.SqlException = "Incorrect syntax near '='." I just want something so i can put "table doesnt exist" in the error message without having to use:
catch ex as System.Data.SqlClient.SqlException
As i have other code on my page that could result in a different type of sqlExeption.
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Oct 7, 2010
while doing debugging i found a blue dotted corner around catch block, while hovering it is showing system.exception...what does it mean and what to do
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Apr 8, 2010
For example, if you use this attribute in a view model object:
[Required(ErrorMessage = "MyErrorMessage")]
public virtual string Subject { get; set; }
Then the following javascript will become generated (but below I have only copied the relevant part below) into the generated "mvcClientValidationMetadata": "Subject_validationMessage","ValidationRules":[{"ErrorMessage":"MyErrorMessage"
I know how it is possible to localize the messages in server validation, by adding your own localized message value to the ModelState, i.e. with the method 'ModelStateDictionary.AddModelError(key, "MyLocalizedMessage");' where the key can be retrieved as illustrated in the "GetErrors" method in the blog tutorial abot xVal [URL]
However, I have not figured out how to be able to customize the generated javascript, which I want to provide with the same localized validation messages as those that will become displayed when the server validation is executing (e.g. for clients that have disabled javascript).
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Jan 4, 2011
I am simply trying to store a label in a variable in javascript but for some reason this isn't working with document.getElementById('control');. I know my javascript is linking to my html file fine because everything else works.
Here is my javascript code:
function performEvapCooledCircuit(txt)
{
var error = document.getElementById('lblError');
if (txt.value == null || isNaN(txt.value))
{.....
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Sep 9, 2010
I have four text boxes and am looking to auto tab when they reach their max length. I don't want to autopost back so I'm looking to write a javascript function like this but just can't get it working
Code:
txtYr.Attributes.Add("onkeypress", "return Tab(currentField,nextField)")
Code:
function Tab(currentField, nextField)
{
// Determine if the current field's max length has been reached.
[code]....
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Dec 2, 2010
I have a project that just happens to be MVC and in Visual Studio 2010. (I don't know if that has anything to do with it, but I'm just trying to be specific in the problem) The issue is that when I build it it is auto minimizing the javascript and as such makes it really hard to debug.
I have looked at the build events and there are none.
I have looked for any vs extensions that could do this and I don't see any out of the ordinary.
I have edited the project file just to make sure nothing was hidden in it.
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