MVC :: Render MSCHart Using RenderControl?
Jan 18, 2011
I want to do a Jquery POST and get a chart using renderControl attribute of CHart which will return HTML attributes back to browser. The CHart is created dynamically based on parameters passed from post and from model. I have successfully done this on WEbforms,
However the same with MVC give a empty image. The handler doesn't perform the same in MVC2 3.5. I went near to 50 sites now.
I can't use other solution like base64encoding as IE6, 7 don't support it.
What I'm trying to do? I have few data parameteres to be sent (POST) to server and in response get the Chart image as tag along with other attributes and data appended in HTML form and sent to browser, all this to be done using JQUERY. No postbacks to be used.
I have badly searched on google, bing nothing turns out to be valuable.
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Similar Messages:
Mar 24, 2011
I have a custom web part that I am trying to call the RenderContents method on, but the results only contains the surrounding div for the web part, and not any child controls.
Take for example this simple web part:
namespace MyWebParts
{
public class MyTestWebPart : WebPart
{
public MyTestWebPart()
{
this.CssClass = "myTestWebPart";
}
protected override void CreateChildControls()
{
base.CreateChildControls();
this.Controls.Add(new LiteralControl("Nothing here yet."));
}
}
}
Then, in an http handler, I'm trying to instantiate this web part and call its RenderControl method. The result is <div class="myTestWebPart"></div>.
Does anyone know why I am not getting my controls from CreateChildControls also added to the output?
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Mar 16, 2011
I have read many posts in the past about TreeView in Custom CompositeControls and using RenderControl but have yet to see a solution. I declare a new Tree in the CreateChildControls method and in the render I try to call the RenderControls method and it gave me an object reference not set to instance of an object error. I have set the SkipLinkText to Nothing, String.Empty and "". Once I do that I get the second stack trace. The control worked when it was a control on the aspx page.
[Code]....
STACK TRACE
[Code]....
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Oct 1, 2010
I am trying to find out what html is generated when a control is rendered. For most controls, the following worked fine: Dim tempbuilder As New System.Text.StringBuilder() Dim tempwriter As New
System.Web.UI.HtmlTextWriter(New System.IO.StringWriter(tempbuilder))
Dim generatedhtml as String Me.imgImage.RenderControl(tempwriter) generatedhtml = tempbuilder.ToString()
However, when I tried doing it with an ImageButton, I recieved the following error: Control 'ctl00_cphExampleContent_imgButton' of type 'ImageButton' must be placed inside a form tag with runat=server. What can I do to avoid this?
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Feb 12, 2011
I've been watching a video on Scott Hanselmnn teaching MVC 2 tricks/tips. He mentions how MVC 2 by default uses ASP.NET Web Forms view engine to render the output of the views; he mentions that the web forms view engine is a little slower than it could be for MVC 2 since it generates a control tree and then outputs the HTML to the page (I hope I said that right).
I was wondering what he meant by web forms generating a code tree before outputting the HTML to the page. Does anyone have insight on the view engine of Web forms and the steps of the rendering process works for ASP.NET and MVC2?
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Jan 6, 2011
If I have an HtmlTextWriter with some content in it, is it possible to append the output of ontrol.RenderControl to the existing content of the HtmlTextWriter directly?
Or do I always have to output to a separate HtmlTextWriter/StringWriter/StringBuilder and then append the StringBuilder?
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Mar 12, 2010
why asp.net does not render a dropdownlist with the autopostback property set to true when using the RenderControl method.
eg
Dim sw As New IO.StringWriter
Dim tw As New HtmlTextWriter(sw)
Dim table As New Table
[Code]...
my output renders the dropdown list without the onchange="javascript:setTimeout('__doPostBack(ddl1','')', 0)" that is generated by asp.net when using the dropdownlist normally.
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Feb 23, 2010
I need to get the html of a chart control built at runtime. When I call .RenderControl, I get System.NullReferenceException. What could the problem be? Is there another way to go about this (saving as image)? Below is my code.
[Code]....
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Feb 5, 2011
I have today developed a page that builds a series of RadioButtonLists, which may or may not be required fields.
As the page varies depending on DB values, I have rendered the controls using .RenderControl().
Unfortunatley I do not have the code to hand right now, but its along the lines of:
RadioButtonList rblQuestion = new RadioButtonList();
rblQuestion.id = question.ID;
// Add ListItems...
RequiredFieldValidator rfvQuestion = new RequiredFieldValidator();
rfvQuestion.ControlToValidate = rblQuestion.ID;
rfvQuestion.ErrorMessage = "*";
I then use .RenderControl on both rblQuestion and rfvQuestion, concatenate into a string then use the HTML String to populate a PlaceHolder.
This seems to work fine, all appears as expected apart from the RequiredFieldValidator - I get a red asterix (My ErrorMessage) next to each RadioButtonList - But this appears as soon as the page loads, not on a post/button click.
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Jan 27, 2011
I am using the following code to export a Gridview to an Excel spreadsheet. It works great until I select more than 10 records. At the 11th record I get an error on the line of code that reads....GridView1.RenderControl(hw)The error reads....RegisterForEventValidation can only be called during Render(); Description:An unhandled exception occurred during the execution of the current web request.Please review the stack trace for more information about the error and where it originated in the code.Exception Details: System.InvalidOperationException: RegisterForEventValidation can only be called during Render();Source Error:
[Code]....
Sub:
[Code]....
[Code]....
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May 27, 2010
I am using TreeView Control in Asp.net. I have placed this control inside a panel. The tree control is completely binded (we don't want populate on demand) with an Xmldatasource during a callback and then I call Panel.renderControl to return the response (HTML) to the client side callback handler. Problem: 1. The tree expand/collapse (on click of plus sign) is causing postback whereas when I normally bind a tree with xml during postback and without using renderControl of container control, the expand/collapse (on click of plus sign) is being handled at client side. I want to stop this postback and allow tree node to call javascript to toggle nodes as it does when tree is binded and renderd in case of normal page life cycle.(when render control function is not used)
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Sep 30, 2010
Is there any working example of asp.net mvc with line chart of mschart?
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Aug 4, 2010
I have a web application with several MSChart and I need print all these chart but I dont know how. In some examples in the internet people using EditCopy() but it dont working for me because I cant found that method.
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Oct 11, 2010
I would like to customize the labels on the datapoints below so they would render as (using first datapoint on the chart as an example) :
4:10 - 4:40
yellow class
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Jan 29, 2010
Got the MSChart working fine in a standard view, but I'm trying to put them on partial views that I'm then loading using jQuery tabs.
Problem is if you try to put the Chart on a partial, it moans about System.Web.UI.DataVisualization, saying it can't find it, no problem on a standard view though.
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Sep 27, 2010
Can you use the new Microsoft Chart Control for .NET Framework inside a usercontrol? Bacause when i take a working chart from my page and then copy it to a usercontrol the picture is blank very weird.
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Mar 29, 2010
I have installed the asp.net MSChart control for VS2008 and set up a chart on my webform. I am using DataBindTable in code to bind data from a LINQ query. The data for the x axis looks something like this:
Date/Time
15/03/2010 08:00:00
15/03/2010 14:00:00
15/03/2010 20:00:00
16/03/2010 08:00:00
16/03/2010 14:00:00
etc
When the chart displays the X axis only displays multiple dates, and not times, no matter what properties I try to change.
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Mar 25, 2010
We are using MSChart on an ASP.net 3.5 web application and noticing significant slowness from enabling tooltips. the performance of drawing a chart is increased by 1,000-2,000ms.The chart output is PNG, and contains in total 108 data points.
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Apr 16, 2010
I need the capability to display a chart, click on a region and display the details in a jqgrid on the same page. I tried using a pie Chart and I can't seem to capture or create a click event for the chart. The data points contain a .url property which I can redirect to a different page but I need to display details on the same page like a master-detail page.
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Dec 23, 2010
How can I display a TimeSeries?Is it possible to use the MSChart Control (Asp.net Charting Control)?
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Oct 18, 2010
I have an mschart control which is databound in code-behind. The Y axis values can vary from vary small to very broad. So the range is set to auto. This works fine except when the values in range of 0 and <1.
In this range the axis only has a zero, it does not have a "1" at top. Is it possible to set to dynamically set the maximum? So if the maximum value is less than one, still show a one.
i.e. get maximum value and set the Y axis maximum = maximum value +1
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Nov 26, 2010
I tried to place 4 mschart controls on the same page but it is giving me major grief. Each chart appears properly when I place one per page, but as soon as I place multiple the first two are displaying incorrect data and the last two do no display anything at all.
I made sure that I am not using the same session variable eventhough that seems to be the most like culprit.
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Feb 26, 2010
using Mschart on my MVC project,when i use the first index page of project to render for the partial view name index2 the code is
<% Html.RenderPartial("Index2"); %>
But when i run it the error is occur which the message is
CS0029: Cannot implicitly convert type 'ASP.views_home_index2_ascx' to 'System.Web.UI.Page'
-it said that the problem line of code is
: // Render chart control
Line 52: Chart2.Page = this;
[code]...
But when i put all of code in Index2.ascx to the index.aspx and not to render the partial view it work fine
Code of Index2.ascx is
<%
System.Web.UI.DataVisualization.Charting.Chart Chart2 = new System.Web.UI.DataVisualization.Charting.Chart();
Chart2.Width = 412;
Chart2.Height = 296;
[code]...
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Mar 8, 2010
I'm using the MSChart Control in a Web Project. I saw that there are 3 different storage mode settings: file/memory/session. I couldn't find any information about the pros/contras or the impact of the settings.
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Aug 10, 2010
I am using the .net 3.5 chart controls and I am binding a chart to a datatable datasource. How do you keep the charts displayed after a postback has ocured. I bind my chart control. The on the page i make a change to a dropdownlist that issues a postback to the server. When the page reloads the charts have no data. How can you make the chart object persist it's data during postback?
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