I am not so familiar with c# or asp.net. If you have a solution, please keep this in mind when explaining.
I am using DNN and Evoq. I have created a new module using Module Creator. I need to access my table (Test_Table). This table is internal it's part of DNN/Evoq database.
I can access it when i go to Evoq (CMS), settings, SQL Console. (Example: Select * from Test_Table) The table is set up correctly.
These are the starter files I got when i created the module:
View.ascx, View.ascx.cs and In App_LocalResources View.ascx
My Question.
How do i get the table values for Test_Table, a table that is not external but part of DNN/Evoq database. There is also no security / login requirements for this table.
Code on: View.ascx.cs
#region Using Statements
using System;
using DotNetNuke.Entities.Modules;
#endregion
namespace TestFormSupport1.MyTestFormSupport1
{
public partial class View : PortalModuleBase
{
#region Event Handlers
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
cmdSave.Click += cmdSave_Click;
cmdCancel.Click += cmdCancel_Click;
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
if (!Page.IsPostBack)
{
txtField.Text = (string)Settings["field"];
}
}
protected void cmdSave_Click(object sender, EventArgs e)
{
ModuleController.Instance.UpdateModuleSetting(ModuleId, "field", txtField.Text);
DotNetNuke.UI.Skins.Skin.AddModuleMessage(this, "Update Successful 3", DotNetNuke.UI.Skins.Controls.ModuleMessage.ModuleMessageType.GreenSuccess);
}
protected void cmdCancel_Click(object sender, EventArgs e)
{
}
#endregion
}
}
Code on View.ascx
<%# Control Language="C#" AutoEventWireup="false" Inherits="TestFormSupport1.MyTestFormSupport1.View" CodeFile="View.ascx.cs" %>
<%# Register TagPrefix="dnn" TagName="Label" Src="~/controls/LabelControl.ascx" %>
<div class="dnnForm dnnEdit dnnClear" id="dnnEdit">
<fieldset>
<div class="dnnFormItem">
<dnn:label id="plField" runat="server" text="Field" helptext="Enter a value" controlname="txtField" />
<asp:textbox id="txtField" runat="server" maxlength="255" />
</div>
</fieldset>
<ul class="dnnActions dnnClear">
<li><asp:linkbutton id="cmdSave" text="Save" runat="server" cssclass="dnnPrimaryAction" /></li>
<li><asp:linkbutton id="cmdCancel" text="Cancel" runat="server" cssclass="dnnSecondaryAction" /></li>
</ul>
</div>
Thanks in advance
DNN has different possibilities to access data - DAL, DAL+ and DAL2 (which is the "newest" one). To find an example read Using DAL 2 in a real world module.
Related
I'm using two kinds of validation: Client Side and Server Side on a Blazor Project.
Client side is using DataAnnotations, as usual and DataAnnotationsValidator and is working just fine.
Server Side is using this custom server side validation component:
public sealed class ServerSideValidator : ComponentBase
{
private ValidationMessageStore _messageStore;
[CascadingParameter]
private EditContext CurrentEditContext { get; set; }
protected override void OnInitialized()
{
if (CurrentEditContext == null)
{
throw new InvalidOperationException($"{nameof(ServerSideValidator)} requires a cascading " +
$"parameter of type {nameof(EditContext)}. For example, you can use {nameof(ServerSideValidator)} " +
$"inside an {nameof(EditForm)}.");
}
_messageStore = new ValidationMessageStore(CurrentEditContext);
CurrentEditContext.OnValidationRequested += (s, e) => _messageStore.Clear();
CurrentEditContext.OnFieldChanged += (s, e) => _messageStore.Clear(e.FieldIdentifier);
}
public void DisplayErrors(Dictionary<string, List<string>> errors)
{
foreach (var (elementId, errorsForElement) in errors)
{
_messageStore.Add(CurrentEditContext.Field(elementId), errorsForElement);
}
CurrentEditContext.NotifyValidationStateChanged();
}
}
And it's also working fine for "direct" properties of the model.
<ValidationMessage For="#(() => model.Property)"/>
Works great. Textbox is red rounded if it's invalid, after the server validation.
Problem is that properties of child model object are being validated (model is set as invalid) and are displayed on ValidationSummary, but the invalid field is not being marked as that.
<ValidationMessage For="#(() => model.Child.Property )"/>
So this is partially working.
When I'm server side validating the attribute, I'm populating the expected list:
IDictionary<string, List<string>> validationErrors
For direct childs (which works) I'm doing:
validationErrors.Add("fieldName", new List {"Is invalid...."});
For childs of model (which doesn't work) I'm doing:
validationErrors.Add("childName.fieldName", new List {"Is invalid...."});
As you can see, although child property is invalid, and form is invalid, jquery shows it as valid.
How do I need to name that property in order for the validator to display the errors?
You need to use the ObjectGraphDataAnnotationsValidator (if you want to use a custom implementation you can find the sources online).
It's in preview but it works fine.
Add this reference to your project:
<PackageReference Include="Microsoft.AspNetCore.Components.DataAnnotations.Validation" Version="3.2.0-rc1.20223.4" />
and use it instead of DataAnnotationsValidator:
<EditForm EditContext="#editContext" OnSubmit="#OnSubmit">
#* replace this => <DataAnnotationsValidator /> *#
<ObjectGraphDataAnnotationsValidator />
<ValidationSummary />
...
I'm implementing MVC using JSP and JDBC. I have imported a database class file to my JSP file and I would like to show the data of a DB table. I don't know how I should return the ResultSet from the Java class to the JSP page and embed it in HTML.
How can I achieve this?
In a well designed MVC approach, the JSP file should not contain any line of Java code and the servlet class should not contain any line of JDBC code.
Assuming that you want to show a list of products in a webshop, the following code needs to be created.
A Product class representing a real world entity of a product, it should be just a Javabean.
public class Product {
private Long id;
private String name;
private String description;
private BigDecimal price;
// Add/generate getters/setters/c'tors/equals/hashcode boilerplate.
}
A DAO class which does all the nasty JDBC work and returns a nice List<Product>.
public class ProductDAO {
private DataSource dataSource;
public ProductDAO(DataSource dataSource) {
this.dataSource = dataSource;
}
public List<Product> list() throws SQLException {
List<Product> products = new ArrayList<Product>();
try (
Connection connection = dataSource.getConnection();
PreparedStatement statement = connection.prepareStatement("SELECT id, name, description, price FROM product");
ResultSet resultSet = statement.executeQuery();
) {
while (resultSet.next()) {
Product product = new Product();
product.setId(resultSet.getLong("id"));
product.setName(resultSet.getString("name"));
product.setDescription(resultSet.getString("description"));
product.setPrice(resultSet.getBigDecimal("price"));
products.add(product);
}
}
return products;
}
}
A servlet class which obtains the list and puts it in the request scope.
#WebServlet("/products")
public class ProductsServlet extends HttpServlet {
#Resource(name="jdbc/YourDB") // For Tomcat, define as <Resource> in context.xml and declare as <resource-ref> in web.xml.
private DataSource dataSource;
private ProductDAO productDAO;
#Override
public void init() {
productDAO = new ProductDAO(dataSource);
}
#Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
List<Product> products = productDAO.list();
request.setAttribute("products", products); // Will be available as ${products} in JSP
request.getRequestDispatcher("/WEB-INF/products.jsp").forward(request, response);
} catch (SQLException e) {
throw new ServletException("Cannot obtain products from DB", e);
}
}
}
Finally a JSP file in /WEB-INF/products.jsp which uses JSTL <c:forEach> to iterate over List<Product> which is made available in EL by ${products}, and uses JSTL <c:out> to escape string properties in order to avoid XSS holes when it concerns user-controlled input.
<%# taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%# taglib uri="http://java.sun.com/jsp/jstl/format" prefix="fmt" %>
...
<table>
<c:forEach items="${products}" var="product">
<tr>
<td>${product.id}</td>
<td><c:out value="${product.name}" /></td>
<td><c:out value="${product.description}" /></td>
<td><fmt:formatNumber value="${product.price}" type="currency" currencyCode="USD" /></td>
</tr>
</c:forEach>
</table>
To get it to work, just call the servlet by its URL. Provided that the servlet is annotated #WebServlet("/products") or mapped in web.xml with <url-pattern>/products</url-pattern>, then you can call it by http://example.com/contextname/products
See also:
How to avoid Java code in JSP files?
doGet and doPost in Servlets
How should I connect to JDBC database / datasource in a servlet based application?
Design Patterns web based applications
RequestDispatcher.forward() vs HttpServletResponse.sendRedirect()
How to map a ResultSet with unknown amount of columns to a List and display it in a HTML table?
How do I pass current item to Java method by clicking a hyperlink or button in JSP page?
MVC, in a web application context, doesn't consist in using a class from a JSP. It consists in using the following model :
browser sends a request to a web server
the web server is configured so that the request is handled by a servlet or a filter (the controller : Java code, not JSP code)
The servlet/filter usually dispatches the request to a specific class (called an Action, the specific part of the controller), based on configuration/annotations
The action executes the business logic (i.e. fetch the data from the database in your example : the model)
The action forwards the request to a JSP. The role of the JSP is only to generate HTML code (i.e. display your data : the view)
Since the JSP usually uses JSP tags (the JSTL, for example) and the JSP expression language, and since JSP tags and the EL are designed to get information from JavaBeans, you'd better have your data available in the form of JavaBeans or collections of JavaBeans.
The role of the controller (the action class) is thus to fetch the data, to create JavaBean instances containing the data, in a suitable format for the JSP, to put them in request attributes, and then to dispatch to the JSP. The JSP will then iterate through the JavaBean instances and display what they contain.
You should not implement the MVC framework yourself. Use existing ones (Stripes, Struts, etc.)
I don't know how should I return the ResultSet from the class file to the JSP page
Well, you don't.
The point of MVC is to separate your model ( the M DB info in this case ) from your view ( V a jsp, in this case ) in such a way you can change the view without braking to application.
To do this you might use an intermediate object to represent your data ( usually called DTO - after Data Transfer Object -, don't know how they call it these days ), and other object to fetch it ( usually a DAO ).
So basically you have your JSP file, get the request parameters, and then invoke a method from the DAO. The dao, internally has the means to connect to the db and fetch the data and builds a collections of DTO's which are returned to the JSP for rendering.
Something like this extremely simplified ( and insecure ) code:
Employee.java
class Employee {
String name;
int emplid;
}
EmployeeDAO.java
class EmployeeDAO {
... method to connect
etc.
List<Employee> getAllNamed( String name ) {
String query = "SELECT name, emplid FROM employee where name like ?";
ResultSet rs = preparedStatement.executeQuery etc etc.
List<Employee> results = ....
while( rs.hasNext() ) {
results.add( new Employee( rs.getString("name"), rs.getInt("emplid")));
}
// close resources etc
return results;
}
}
employee.jsp
<%
request.setAttribute("employees", dao.getAllNamed( request.getParameter("name") );
%>
<table>
<c:forEach items="${employees}" var="employee">
<tr><td>${employee.emplid}</td><td>${employee.name}</td></tr>
</c:forEach>
</table>
I hope this give you a better idea.
I have a problem. I don't understand clearly the code. I have a similar problem with my code.
I have created database SQL and filled up. Then I want to implement a MainServlet (code below) that richieve data from database and in a different jsp page, I want to insert that data in section like h1, h2 ecc... I must use the ${} sintax but I don't know how do that.
Briefly, In jsp file (code below, I MUST USE ${} SINTAX) I want to "call" MainServlet and there I want to richieve data from database and view in jsp file.
I hope I have explained correctly, thank you very much!
MainServlet.java
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class MainServlet
*/
#WebServlet({ "/MainServlet" })
public class MainServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final String PATH_JSP = "/WEB-INF/";
/**
* #see HttpServlet#HttpServlet()
*/
public MainServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
// TODO Auto-generated method stub
}
/**
* #see Servlet#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String doveAndare = request.getParameter("azione");
if(doveAndare==null)
doveAndare = "index";
try {
String driverString = "com.mysql.cj.jdbc.Driver";
Class.forName(driverString);
String connString = "jdbc:mysql://localhost:3306/ldd_jewels?user=root&password=";
Connection conn = DriverManager.getConnection(connString);
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM JEWEL");
while (rs.next() == true) {
System.out.println(rs.getString("Category") + "\t" + rs.getString("Name"));
/* I try that but does not work
request.setAttribute("name", rs.getString("Name"));
javax.servlet.RequestDispatcher dispatcher = request.getRequestDispatcher("/WEB-INF/widering_male.jsp");
dispatcher.forward(request, response); */
}
stmt.close();
conn.close();
} catch(Exception e) {
e.printStackTrace();
}
request.getRequestDispatcher(PATH_JSP+doveAndare+".jsp").forward(request, response);
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
doublerow.jsp
<section id="portfolio-details" class="portfolio-details">
<div class="container">
<div class="row gy-4">
<div class="col-lg-8">
<div class="portfolio-details-slider swiper">
<div class="swiper-wrapper align-items-center">
<div class="swiper-slide">
<img src="assets/img/jewels/doublerow_1.jpg" alt="" />
</div>
<div class="swiper-slide">
<img src="assets/img/jewels/doublerow_2.jpg" alt="" />
</div>
<div class="swiper-slide">
<img src="assets/img/jewels/doublerow_3.jpg" alt="" />
</div>
</div>
<div class="swiper-pagination"></div>
</div>
</div>
<div class="col-lg-4">
<div class="portfolio-info">
<h3>Product details</h3>
<ul>
<li><strong>Code</strong>: 1S3D5</li>
<li><strong>Category</strong>: Bracelets</li>
<li><strong>Name</strong>: Double Row Hinged Bangle</li>
<li><strong>Gender</strong>: Female</li>
<li><strong>Material</strong>: Yellow gold</li>
<li><strong>Size</strong>: 121mm</li>
<li><strong>Price</strong>: €5500</li>
</ul>
</div>
<div class="portfolio-description">
<h2>Description of product</h2>
<p>
The entwined ends of Tiffany Knot’s signature motif symbolize
the power of connections between people. Balancing strength
and elegance, each Tiffany Knot design is a complex feat of
craftsmanship. This bangle is crafted with yellow gold and
polished by hand for high shine. Wear on its own or partnered
with classic silhouettes for an unexpected pairing.
</p>
</div>
</div>
</div>
</div>
</section>
This is my database:
I want to insert each jewel in different pages (each jewel have a jsp file)
You can use the <c:forEach > tag
you can find a detailed example in the following link example use
I think it will be better for you to contain the data of the table into a collection such as list and return the list from the Java class and reuse this collection in the JSP.
I have a simple form like this which makes use of the #Html.EditorFor extension:
<form method="post">
#Html.EditorFor(x => x.SystemSettings.EmailFromAddress)
<submit-button title="Save"></submit-button>
</form>
I want to take advantage of .NET Core's tag helpers so that my form looks like this instead:
<form method="post">
<editor asp-for="SystemSettings.EmailFromAddress"/>
<submit-button title="Save"></submit-button>
</form>
I also eventually would like to have my own custom tag helpers so I can do something like this instead:
<text-box asp-for="SystemSettings.EmailFromAddress"></text-box>
I have a string template which gets rendered by the #Html.EditorFor extension:
#model string
<div class="form-group">
<label asp-for="#Model" class="m-b-none"></label>
<span asp-description-for="#Model" class="help-block m-b-none small m-t-none"></span>
<div class="input-group">
<input asp-for="#Model" class="form-control" />
<partial name="_ValidationIcon" />
</div>
<span asp-validation-for="#Model" class="validation-message"></span>
</div>
To do that, I saw someone implemented an EditorTagHelper, which looks like this:
[HtmlTargetElement("editor", TagStructure = TagStructure.WithoutEndTag,
Attributes = ForAttributeName)]
public class EditorTagHelper : TagHelper
{
private readonly IHtmlHelper _htmlHelper;
private const string ForAttributeName = "asp-for";
private const string TemplateAttributeName = "asp-template";
[HtmlAttributeName(ForAttributeName)]
public ModelExpression For { get; set; }
[HtmlAttributeName(TemplateAttributeName)]
public string Template { get; set; }
[ViewContext]
[HtmlAttributeNotBound]
public ViewContext ViewContext { get; set; }
public EditorTagHelper(IHtmlHelper htmlHelper)
{
_htmlHelper = htmlHelper;
}
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
if (context == null)
throw new ArgumentNullException(nameof(context));
if (output == null)
throw new ArgumentNullException(nameof(output));
if (!output.Attributes.ContainsName(nameof(Template)))
{
output.Attributes.Add(nameof(Template), Template);
}
output.SuppressOutput();
(_htmlHelper as IViewContextAware).Contextualize(ViewContext);
output.Content.SetHtmlContent(_htmlHelper.Editor(For.Name, Template));
await Task.CompletedTask;
}
}
When I use the EditorTagHelper though, it seems to be missing the unobtrusive Javascript validation attributes:
Using #Html.EditorFor, this gets rendered:
<input class="form-control valid" type="text" data-val="true" data-val-required="Email From Address cannot be empty" id="SystemSettings_EmailFromAddress" name="SystemSettings.EmailFromAddress" value="whatever#test.com" aria-required="true" aria-invalid="false" aria-describedby="SystemSettings_EmailFromAddress-error">
It's got the data-val attributes so client-side validation gets applied.
When I use the EditorTagHelper instead, this gets rendered:
<input class="form-control valid" type="text" id="SystemSettings_EmailFromAddress" name="SystemSettings.EmailFromAddress" value="whatever#test.com" aria-invalid="false">
The unobtrusive validation attributes are not being applied. I am using FluentValidation and I have specified an AbstractValidator like this:
public class SystemSettingsValidator : AbstractValidator<SystemSettings>
{
public SystemSettingsValidator()
{
RuleFor(x => x.EmailFromAddress).NotEmpty()
.WithMessage("Email From Address cannot be empty");
}
}
I found that if I removed the AbstractorValidator and simply added a [Required] attribute to my model property the validation then works properly. This suggests that there is something wrong with FluentValidation. Perhaps there is a configuration issue.
I am using Autofac dependency injection to scan my assemblies and register validator types:
builder.RegisterAssemblyTypes(Assembly.Load(assembly))
.Where(t => t.IsClosedTypeOf(typeof(IValidator<>)))
.AsImplementedInterfaces()
.PropertiesAutowired()
.InstancePerLifetimeScope();
This seems to work fine. In case it wasn't fine, I also tried registering the validators from the fluent validation options like this:
.AddFluentValidation(fv =>
{
fv.RegisterValidatorsFromAssemblies(new List<Assembly>
{Assembly.GetExecutingAssembly(), Assembly.Load(nameof(Entities))});
})
This also seemed to be fine.
One thing to note is that an earlier problem I had was that using Autofac assembly scanning was breaking the application when tag helpers were included. I added a filter to ensure that tag helpers are not included when registering these dependencies, e.g.
builder.RegisterAutowiredAssemblyInterfaces(Assembly.Load(Web))
.Where(x => !x.Name.EndsWith("TagHelper"));
I have uploaded a working sample of the code here: https://github.com/ciaran036/coresample2
Navigate to the Settings Page to see the field I am trying to validate.
This issue also appears to affect view components.
Thanks.
I believe the issue is in the tag helper, in that it uses IHtmlHelper.Editor rather than IHtmlHelper<TModel>.EditorFor to generate the HTML content. They are not quite the same.
As you point out FluentValidation injects the validation attributes as you'd expect for #Html.EditorFor(x => x.SystemSettings.EmailFromAddress). However for #Html.Editor("SystemSettings.EmailFromAddress"), which is what your custom tag helper is doing, FluentValidation doesn't inject the validation attributes. So that rules out the tag helper itself and moves the problem to the Editor invocation.
I also noticed that Editor doesn't resolve <label asp-for (or the other <span asp-description-for tag helper you're using) so that suggests it's not a FluentValidation specific issue.
I wasn't able to replicate your success with the Required attribute for the custom tag helper/Editor - the Required attribute only injected the validation attributes when using EditorFor.
The internals for Editor and EditorFor are similar but with a key difference, the way they resolve the ModelExplorer instance used to generate the HTML content differs and I suspect this is the problem. See below for these differences.
Things like PropertyName set to null and Metadata.Property not being set for Editor, but set to EmailFromAddress and SystemSettings.EmailFromAddress for EditorFor are standing out as potential causes for the behaviour we're seeing.
The painful part is the tag helper has a valid ModelExplorer instance via the For property. But there is no built in provision to provide it to the html helper.
As to the resolution, the obvious one seems to be to use EditorFor rather than Editor however it doesn't look easy. It'd likely involve reflection and building an expression.
Another option is, considering the tag helper resolves the ModelExplorer correctly, is to extend HtmlHelper and override the GenerateEditor method - what both Editor and EditorFor end up invoking - so you can pass in the ModelExplorer and work around the problem.
public class CustomHtmlHelper : HtmlHelper, IHtmlHelper
{
public CustomHtmlHelper(IHtmlGenerator htmlGenerator, ICompositeViewEngine viewEngine, IModelMetadataProvider metadataProvider, IViewBufferScope bufferScope, HtmlEncoder htmlEncoder, UrlEncoder urlEncoder) : base(htmlGenerator, viewEngine, metadataProvider, bufferScope, htmlEncoder, urlEncoder) { }
public IHtmlContent CustomGenerateEditor(ModelExplorer modelExplorer, string htmlFieldName, string templateName, object additionalViewData)
{
return GenerateEditor(modelExplorer, htmlFieldName, templateName, additionalViewData);
}
protected override IHtmlContent GenerateEditor(ModelExplorer modelExplorer, string htmlFieldName, string templateName, object additionalViewData)
{
return base.GenerateEditor(modelExplorer, htmlFieldName, templateName, additionalViewData);
}
}
Update your tag helper to use it:
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
if (context == null)
throw new ArgumentNullException(nameof(context));
if (output == null)
throw new ArgumentNullException(nameof(output));
if (!output.Attributes.ContainsName(nameof(Template)))
{
output.Attributes.Add(nameof(Template), Template);
}
output.SuppressOutput();
(_htmlHelper as IViewContextAware).Contextualize(ViewContext);
var customHtmlHelper = _htmlHelper as CustomHtmlHelper;
var content = customHtmlHelper.CustomGenerateEditor(For.ModelExplorer, For.Metadata.DisplayName ?? For.Metadata.PropertyName, Template, null);
output.Content.SetHtmlContent(content);
await Task.CompletedTask;
}
Finally register the new helper, the earlier the better I'd say
services.AddScoped<IHtmlHelper, CustomHtmlHelper>();
Working solution
I just upgraded from 5.1 to 7.0 and now I am getting this error on one of the pages that have a PdfDocumentLink control (in Edit Mode):
A required control was not found in the template for "~/Sitefinity/Extensions/WidgetTemplates/Libraries/Documents/PdfDocumentLink.ascx". The control must be assignable from type "System.Web.UI.HtmlControls.HtmlGenericControl" and must have ID "itemsContainer".
I get a 500 in Preview mode.
This is the code for the ascx, in \Sitefinity\Extensions\WidgetTemplates\Libraries\Documents
<%# Control Language="C#" %>
<%# Register TagPrefix="sitefinity" Assembly="Telerik.Sitefinity" Namespace="Telerik.Sitefinity.Web.UI" %>
<%# Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Web.UI.PublicControls.BrowseAndEdit" Assembly="Telerik.Sitefinity" %>
<sitefinity:ResourceLinks id="resourcesLinks2" runat="server" UseEmbeddedThemes="false" Theme="Default">
<sitefinity:ResourceFile Name="~/Sitefinity/Extensions/WidgetTemplates/Libraries/Documents/PdfDocumentLink.css" Static="true" />
</sitefinity:ResourceLinks>
<sitefinity:SitefinityHyperLink ID="documentLink" runat="server" target="_blank" CssClass="PdfDocumentLink" />
<sf:BrowseAndEditToolbar ID="browseAndEditToolbar" runat="server" Mode="Edit"></sf:BrowseAndEditToolbar>
Here's the cs file ... under C:\inetpub\xxx\App_Code\Widgets
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace xxx.Sitefinity.Widgets.Libraries.Documents {
/// <summary>
/// Summary description for PdfDocumentLink
/// </summary>
public class PdfDocumentLink : Telerik.Sitefinity.Modules.Libraries.Web.UI.Documents.DocumentLink {
public PdfDocumentLink() : base () {
//
// TODO: Add constructor logic here
//
}
public override string LayoutTemplatePath {
get {
return "~/Sitefinity/Extensions/WidgetTemplates/Libraries/Documents/PdfDocumentLink.ascx";
}
set {
base.LayoutTemplatePath = value;
}
}
public string LinkTitle {
get;
set;
}
protected override void OnPreRender(EventArgs e) {
base.OnPreRender(e);
if (this.LinkTitle != null)
this.DocumentLinkControl.Text = this.LinkTitle;
}
}
}
And ToolboxesConfig.config file:
...
<toolboxesConfig xmlns:config="urn:telerik:sitefinity:configuration" xmlns:type="urn:telerik:sitefinity:configuration:type" config:version="7.0.5100.0">
<toolboxes>
<toolbox name="PageControls">
<sections>
<add name="ContentToolboxSection">
<tools>...
<add enabled="True" type="OneCommand.Sitefinity.Widgets.Libraries.Documents.PdfDocumentLink" title="PDF Document Link" description="Link to a PDF Document" cssClass="sfDownloadLinkIcn" moduleName="Libraries" Name="PDFDocumentLink" visibilityMode="None" name="PDFDocumentLink" />
If I delete the widget, and add it back in, and select a pdf document, I get the same error.
The Document Link widget appears to work ok, but that one doesn't have the left side PDF icon that we want to display.
Any ideas?
Try adding this to your .ascx file:
<div runat="server" id="itemsContainer"></div>
If dt_grid.Rows.Count > 0 Then
dt_grid.DataSource = dt_grid
Else
MessageBox.Show("Not Found Data")
End If
I know that if get datatable in gridview.datasource,ever write gridview.Databind.But I found coding of my friend. He write only get datatable in gridview.datasource but no write gridview.dataBind. Therefore, his coding is not error. Why? Don't need to dataBind?
Are you sure your friend is not using the DataSourceID property?
Here is the difference from MSDN:
When the DataSourceID property is set (instead of the DataSource property), the data-bound control automatically binds to the data source control at run time.
Please take a look at this article and this one.
Hope it helped.
I took the time to do a small example to demonstrate that you need to call DataBind() on a normal asp.net gridview in order to render its data.
If your friend is not calling this, I am guessing that he is binding the grid to a data source in the .aspx code (to a SQLDatasource, on even an ObjectDataSource) and he is modifying that datasource in the code.
Please take a look at the following example:
The default.aspx page:
<%# Page Title="Home Page" Language="C#" AutoEventWireup="true"
CodeBehind="Default.aspx.cs" Inherits="GridViewDemo._Default" %>
<form id="form1" runat="server">
<asp:gridview id="GridView1" runat="server">
<Columns>
<asp:BoundField DataField="ID" />
<asp:BoundField DataField="Name" />
</Columns>
</asp:gridview>
</form>
The codebehind for the page: (it is in C# but I think it is relevant to VB as well)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace GridViewDemo
{
public partial class _Default : System.Web.UI.Page
{
public class Entity
{
public int ID { get; set; }
public string Name { get; set; }
}
protected void Page_Load(object sender, EventArgs e)
{
List<Entity> source = new List<Entity>() { new Entity() { ID = 1, Name = "First" }, new Entity() { ID = 2, Name = "Second" } };
GridView1.DataSource = source;
GridView1.DataBind();
// if you comment this line and run, the gridview is not rendered
}
}
}
Let me know if this answered your question.