Develop Reference

Edit->Find for WebView2 UI Component (WPF/C#/javascript)

I need to implement "Edit->Find" function for a WebView2 UI Component using WPF/C#/javascript... Below you will find two examples: One that is made for a TextBox UI Control called MainWindow1, and the other that is implemented for a WebView2 UI Control that is called MainWindows2. I'm giving both examples because I need to work the same way for each one. The TextBox example is working, but the WebView2 example is missing some javascript code to finish it and maybe requires some tweeting of the C# calls to WebView2.
First, I implemented a "Find Forward" button for a TextBox that I can click multiple times to find the next string matching the search pattern in the textbox. And Here's my XML and C# for it:
MainWindow1 GUI:
MainWindow1 XML:
<Window x:Class="WpfApp1.MainWindow1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp1"
mc:Ignorable="d"
Loaded="Window_Loaded"
Title="MainWindow1" Height="450" Width="800">
<DockPanel LastChildFill="True">
<StackPanel Orientation="Horizontal"
DockPanel.Dock="Top" Background="Aqua">
<TextBox Name="TboxFind" Width="80" Text="id"/>
<Button Name="FindForward" Content="FindForward"
Click="FindForward_Click"/>
</StackPanel>
<TextBox Name="textbox1" VerticalScrollBarVisibility="Auto"/>
</DockPanel>
</Window>
MainWindow1 C#:
using System.Text.RegularExpressions;
using System.Windows; using System.Windows.Controls;
namespace WpfApp1 {
public partial class MainWindow1 : Window {
public MainWindow1() {InitializeComponent();}
private void Window_Loaded(object sender, RoutedEventArgs e) {
string text1 = "";
for (int i = 0; i < 10000; i++) {
text1 = text1 + "id" + i.ToString() + "\n";}
textbox1.Text = text1;textbox1.Focus();textbox1.CaretIndex = 0;
}
private void TextBoxGotoLine(TextBox textbox1, int linenum) {
var target_cpos
= textbox1.GetCharacterIndexFromLineIndex(linenum);
var target_char_rect
= textbox1.GetRectFromCharacterIndex(target_cpos);
var first_char_rect = textbox1.GetRectFromCharacterIndex(0);
textbox1.ScrollToVerticalOffset(target_char_rect.Top
- first_char_rect.Top);
}
private void FindForward_Click(object sender, RoutedEventArgs e) {
string pattern = #"(?i)(" + Regex.Escape(TboxFind.Text) + #")";
string text1 = textbox1.Text.Substring(
textbox1.CaretIndex + textbox1.SelectionLength);
var match1 = Regex.Match(text1, pattern);
if (match1.Success) {
textbox1.Focus();
textbox1.Select(textbox1.CaretIndex
+ textbox1.SelectionLength
+ match1.Index, match1.Groups[0].Length);
} //if
} //function
}/*class*/ }/*namespace*/
The problem I'm having is that I also need this same feature for a WebView2 UI Control.
So I install the WebView2 UI Control:
WebView2 Install:
PM > Install-Package Microsoft.Web.WebView2
Add to XML: xmlns:wv2="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf"
using Microsoft.Web.WebView2.Core;
And here's my corresponding XML and C# demo code that should work the same as the first example I have given:
MainWindow2 GUI:
MainWindows2 XML:
<Window x:Class="WpfApp1.MainWindow2"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:wv2
="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf"
xmlns:local="clr-namespace:WpfApp1"
mc:Ignorable="d"
Loaded="Window_Loaded"
Title="MainWindow2" Height="450" Width="800" >
<DockPanel LastChildFill="True">
<StackPanel Orientation="Horizontal"
DockPanel.Dock="Top" Background="Aqua">
<TextBox Name="SearchStr" Width="80" Text="id"/>
<Button Name="FindForward"
Content="FindForward" Click="FindForward_Click"/>
</StackPanel>
<wv2:WebView2 Name="webview2" CoreWebView2InitializationCompleted
="webview2_CoreWebView2InitializationCompleted" />
</DockPanel>
</Window>
MainWindow2 C#:
using System.Windows; using System.Threading;
using Microsoft.Web.WebView2.Core;
namespace WpfApp1 {
public partial class MainWindow2 : Window {
public MainWindow2() {InitializeComponent(); SearchStr.Focus(); }
private async void Window_Loaded(object sender, RoutedEventArgs e) {
await webview2.EnsureCoreWebView2Async();
}
private void webview2_CoreWebView2InitializationCompleted(
object sender, CoreWebView2InitializationCompletedEventArgs e)
{
string html = "";
for (int i = 0; i < 100; i++) {
string id = "id" + i.ToString();
html = html + "<b>" + id + "</b><br/>";
}
webview2.CoreWebView2.NavigateToString(html);
}
private async Tasks.Task<string> Find(string pattern) {
string js = "";
js = js + "var m1 = document.getElementById(""body"")";
js = js + "/*... ??? what goes here ??? */";
// Find and highlight one at a time, and scroll into view ...
// repeat find from beginning of html body when done ...
// See MainWindow1 example with TextBox for desired behavior here.
return await webview2.ExecuteScriptAsync(js);
}
private void async FindForward_Click(object s, RoutedEventArgs e) {
await Find(SearchStr.Text);
}
}/*class*/ }/*namespace*/
How to use WebBrowser UI Control to do a:
Menu->Edit->Find "SearchStr1"
When I click FindForward Button? I'm thinking it has something to do with executing Javascript on the DOM? each time the button is pressed?

Updating certain Primefaces Diagram Element

I am trying since 2 days to solve a issue I got with my primefaces diagram implementation.
I want on "mouseover" the diagram elements, highlight other elements that are connected with that element.
I have it working, but ONLY if I update the whole diagram/form when I update the elements.
I have two problems with that approach.
First with the constant updates on mouseover all the binding on mouseenter and other stuff, gets reset so I have the event fire all the time although I just entered. Also 80% of the time I dont catch the mouseleave / hover leave event because of the constant calls.
Also I cant scroll the diagram anymore as the constant updates on mouseover would reset the scroll. ;-)
So I tried to only update the diagram elements I actually changed on mouseover, but I could not find a way that worked for me...
I tried just updateing the element via primefaces RequestContect.update
I used all variations on the Id like:
1-0201
diagram-1-0201
diagram:diagram-1-0201
I tried a javascript query from primefaces execute. I got a ui cant be resolved error on that one. Although the same query works on the xhtml. I also couldnt figure out that error. Although I dont think it would help, as the same code doesnt work when executed in the html file aswell.
I tried just saving the connections in a diagram element value and then accessing this value via hidden input on the elements. I got the ids for the connected elements in my javascript but I could not update the elements via javascript aswell. "inside" (leftover commented code) was the variable I had for the hidden inputs that were referenced on the Element variable that stored the connections)
I got both the list and the single connected ids in javascript but couldnt manage to update the elements.
I am not that experienced in javascript. I used it for the first time a few days ago.
So how do I update the style of certain elements in the primefaces diagram without reloading the hole diagram?
There must be a very easy way to do it or an easy way to fix my approaches I just cant see.
It is working if I update the whole diagram as I said, but I cant do that on mouseover for obvious reasons.
I am using primefaces 6.0 with a apache tomcat 8.5
Picture of the setup with ids: http://i.imgur.com/9yTEabE.png
Picture of the javascript log for the events: http://imgur.com/mCgf0BU
my xhtml file:
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml"
xmlns:p="http://primefaces.org/ui"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<h:head>
<p:panelGrid columns="2" styleClass="borderless">
<h:graphicImage name="images/logo.gif" />
<h:outputLabel styleClass="h1" value="Diagram Viewer" />
</p:panelGrid>
<f:metadata>
<f:viewAction action="#{dataManager.onLoad}" />
</f:metadata>
</h:head>
<h:body>
<h:form id="tabMenuForm">
<p:menubar styleClass=".ui-menu .ui-menuitem-link"
model="#{dataManager.menuModel}" />
</h:form>
<h:form id="diagramForm">
<p:dialog widgetVar="statusDialog" modal="true" draggable="false"
closable="false" resizable="false" showHeader="false">
<p:graphicImage value="#{resource['images/defaultLoader.gif']}" />
</p:dialog>
<p:tooltip />
<p:diagram id="diagram" value="#{dataManager.model}"
styleClass="borderless" style="#{dataManager.diagramStyle}" var="el">
<f:facet name="element" id="diagramElement" widgetVar="element">
<h:outputLabel>
<p:commandLink
actionListener="#{tooltipManager.onElementClickedTwo()}"
styleClass="commandRemover">
<f:param name="selected" value="#{el.id}" />
<div class="elID">
<h:outputText value="#{el.id}" />
</div>
<div class="elName">
<h:outputText value="#{el.name}" sytleCLass="elName" />
</div>
</p:commandLink>
</h:outputLabel>
<!-- <h:outputText value="#{el.role}" style="display: inline; align-items: right; margin-top:0em;"/> -->
</f:facet>
</p:diagram>
<p:remoteCommand name="elementMouseOver"
actionListener="#{dataManager.onElementMouseOver}" />
<p:remoteCommand name="elementMouseOut"
actionListener="#{dataManager.onElementMouseOut}" />
<h:inputHidden id="someId" value="#{dataManager.selectedId}" />
<script type='text/javascript'>
$('.ui-diagram-element').hover(function(ev) {
var id = $(this).attr('id');
console.log(ev);
var id = $(this).attr('id');
//var inputs = $(this).find('input');
//console.log('INSIDE!' + inputs);
//var input = inputs[0].val();
//var val = $(input).val();
//console.log('VAL: ' + val);
//console.log('INSIDE!' + input);
//var string = '#diagramForm\\:diagram-' + input;
//$(string).addClass('ui-diagram-element-predecessor');
//+ val[i]));
elementMouseOver([ {
name : 'elementId',
value : id
} ]);
//console.log(val);
}, function(ev) {
//***leave***//
var id = $(this).attr('id');
});
</script>
Important part of the Bean:
private DiagramNode selected;
private String selectedId = "x";
private List<String> selectedList = new ArrayList<String>();
public String getSelectedId() {
return selectedId;
}
public void setSelectedId(String selectedId) {
this.selectedId = selectedId;
}
public List<String> getSelectedList() {
return selectedList;
}
public void setSelectedList(ArrayList<String> selectedList) {
this.selectedList = selectedList;
}
public void onElementMouseOver() {
String input = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("elementId");
System.out.println("DataManager: Input: " + input);
String[] mouseoverIdSplit = input.split("-", 2);
if (mouseoverIdSplit.length < 2)
return;
System.out.println("DataManager: Mouseover:" + mouseoverIdSplit[1]);
selected = DataLoader.WPCPTaskRows.get(mouseoverIdSplit[1]);
selectedId = mouseoverIdSplit[1];
selectedList = selected.connections;
for (String id : selected.connections) {
System.out.println("Setting StyleClass for " + id);
String elementToUpdate = "diagramForm:diagram-" + id;
System.out.println(elementToUpdate);
RequestContext.getCurrentInstance().update(elementToUpdate);
RequestContext.getCurrentInstance()
.execute("$('#" + elementToUpdate + "').addClass(ui-diagram-element-predecessor);");
}
// RequestContext.getCurrentInstance().update("scriptBean");
// RequestContext.getCurrentInstance().update("someId");
RequestContext.getCurrentInstance().update("diagramForm");
RequestContext.getCurrentInstance().update("diagram");
}
public class DiagramElement implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private String name;
private String id;
private String role;
private String predecessor;
private List<String> predecessorList;
public DiagramElement() {
}
public DiagramElement(String name, String id, String role, String predecessor, List<String> predecessorList) {
this.name = name;
this.id = id;
this.role = role;
this.predecessor = predecessor;
this.predecessorList = predecessorList;
}
+getter and setter

After more then 10 hours of insanity I FINALLY got it working.
I connected the strings for the ID in javascript not correctly.
Also I had to add 3 \\ to the string, because 1 was swallowed as a escape and I needed 2 for a javascript function to find the element with a ":" inside it.
Here is how I did it in the end:
<h:inputHidden value="#{el.predecessorList}" />
$('.ui-diagram-element').hover(
function(ev) {
var id = $(this).attr('id');
console.log(ev);
var id = $(this).attr('id');
var inputs = $(this).find('input');
console.log(inputs);
var input = inputs[1];
//var val = $(input).val();
//console.log('VAL: ' + val);
var array = input.value;
console.log(array);
var parsedArray = array.replace("[", "").replace("]",
"").replace(/\s/g, "").split(',');
for ( var pos in parsedArray) {
var str1 = '#diagramForm\\\:diagram-';
var str2 = parsedArray[pos];
console.log(str2);
var con = str1.concat(str2);
console.log(con);
$(con).addClass('ui-diagram-element-predecessor');
}
},
function(ev) {
//***leave***//
var id = $(this).attr('id');
console.log(ev);
var id = $(this).attr('id');
var inputs = $(this).find('input');
console.log(inputs);
var input = inputs[1];
//var val = $(input).val();
//console.log('VAL: ' + val);
var array = input.value;
console.log(array);
var parsedArray = array.replace("[", "").replace("]",
"").replace(/\s/g, "").split(',');
for ( var pos in parsedArray) {
var str1 = '#diagramForm\\\:diagram-';
var str2 = parsedArray[pos];
console.log(str2);
var con = str1.concat(str2);
console.log(con);
$(con).removeClass('ui-diagram-element-predecessor');
}
});

ASP.NET MVC -Refresh CodeMirror editor onclick

I have a codemirror editor in a partial view and a list of files in the main view. I want to refresh the editor once a file name is clicked. I tried many solutions provided on StackOverflow and other websites but nothing worked , and This is my first time using Javascript so I can't figure out What am I doing wrong.
This is my code:
Controller:
public ActionResult Index()
{
StudentsCodes model = new StudentsCodes();
model.Student = (Student)CurrentUser;
var user = UserManager.FindById(((Student)CurrentUser).InstructorID);
model.Instructor =(Instructor) user;
return View(model);
}
public PartialViewResult DevelopmentPartial (StudentsCodes path )
{
return PartialView(path);
}
Main view:
<script type="text/javascript" src="~/Scripts/jquery.unobtrusive-ajax.js"></script>
<script type="text/javascript" src="~/Scripts/jquery-3.1.1.js"></script>
<ul id="tree">
#foreach (var file in Directory.GetFiles(Server.MapPath("~/Content/" + Model.Student.UserName + "/CompilerProject/" + name)))
{
var filename = Path.GetFileName(file);
<li id="filelist" onclick="#(Model.path = "~/Content/" + Model.Student.UserName + "/CompilerProject/src/" + #filename)">
<span class="glyphicon glyphicon-file"></span>
#filename
/li>
}
<div id="partial">
#{
Html.RenderPartial("DevelopmentPartial",null);
}
</div>
<script>
$(document).ready(function () {
$("#filelist").click(function (e) {
#{Html.RenderAction("DevelopmentPartial", Model);
}
});
});
</script>
partial view:
#using (Html.BeginForm())
{
var fileContents= "";
if (Model==null)
{
fileContents = "";
}
else
{
fileContents = System.IO.File.ReadAllText(Server.MapPath(Model.path));
}
#Html.TextArea("code", fileContents, new { id = "code" })
}
I can't assign ids for list elements since their number is unknown at compile time and it changes when the user adds or deletes a file, that's why most of the solutions provided didn't work . The result here was 3 editors overlapping and display the contents of the last file. And <li> items are non-clickable. What am I doing wrong in my code ?
Edit:
After updating the script as the following:
<script>
$(document).ready(function() {
$(".filelist").on("click",function (e) {
$("#partial").load('DevelopmentPartial');
});
});
</script>
It refreshes the partial view but the editor is always empty, and the Model is always null. Is it wrong to update the Model using "onclick"?

In case someone faced the same problem, I solved it by changing id to class at the list, then by using this script:
<div id="partial">
#{
Html.RenderAction("DevelopmentPartial", new { path1 = Model.path});
}
</div>
<script>
$(document).ready(function () {
$('.filelist').on('click', function (e) {
alert('Im clicked on filePath = ' + $(this).attr('value'));
var filePath = $(this).attr('value'); //value is attribute set in Html
$('#partial').load('DevelopmentPartial', { path1: filePath });
});
});
</script>
And the controller:
public PartialViewResult DevelopmentPartial(string path1)
{
modelSC.path = path1;
return PartialView(modelSC);
}
where modelSC is a global variable in the controller.

How to add new row to repeater without losing information in checkboxes

I have a simple Repeater that contains a checkbox and a Full name per each row.
In addition, I have an "Add Name" button that adds a new full name to the database.
Supposingly user checks a few checkboxes and decides to add another name, I would like to be able to add a new name to the repeater without losing the information in the checkboxes that have been already checked.
I understand some javascript code might do the trick the question is how to approach it?
What do I do?
thanks in advance
p.s.
I'll be glad to hear any advice, not olny regarding js.

Here is quick solution, not very pretty but get the job done. Hope it will give you some new ideas
Default.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace RepeaterCheckbox
{
public partial class _Default : System.Web.UI.Page
{
[Serializable]
public class Person
{
public int Id { get; set; }
public string Name { get; set; }
}
List<Person> personsFromDatabase
{
get { return (List<Person>)ViewState["persons"]; }
set { ViewState["persons"] = value; }
}
//here we will store our person selection state
Dictionary<int,bool> personSelectionState
{
get { return (Dictionary<int, bool>)ViewState["data"]; }
set { ViewState["data"] = value; }
}
protected override void OnLoad(EventArgs e)
{
if (!IsPostBack)
{
#region Test data
personsFromDatabase = new List<Person>{
new Person { Id = 1, Name = "Paul", },
new Person { Id = 2, Name = "Tom", },
};
#endregion
Bind(false);
}
base.OnLoad(e);
}
void Bind(bool isPostback)
{
if (!isPostback)
{
//initialize person selection mapping
personSelectionState = new Dictionary<int, bool>();
foreach (Person person in personsFromDatabase)
personSelectionState.Add(person.Id, false);
}
//map persons to anonymous type that will help us define necessary values
rpPersons.DataSource = personsFromDatabase.Select(x => new
{
Id = x.Id,
Name = x.Name,
//get stored selection state for person
Selected = personSelectionState[x.Id],
});
rpPersons.DataBind();
}
protected void btnAddPerson_Click(object sender, EventArgs e)
{
//update selection states
UpdateSelectionStatuses();
if (!String.IsNullOrEmpty(txbName.Text))
{
//add new person
personsFromDatabase.Add(new Person
{
Id = personsFromDatabase.Count +1,
Name = txbName.Text,
});
//add status mapping for new person so there is no error on postback binding
personSelectionState.Add(personsFromDatabase.Count, false);
//Refresh data on page, to see new person
Bind(true);
}
}
void UpdateSelectionStatuses()
{
//loop through all items
for (int i = 0; i < rpPersons.Items.Count; ++i)
{
RepeaterItem repeaterItem = rpPersons.Items[i];
//find checkbox for item
var checkbox = (CheckBox)repeaterItem.FindControl("chbSelected");
if (checkbox != null)
{
//get our custom attribute
int id = int.Parse(checkbox.Attributes["personId"]);
//update stored checkbox status
personSelectionState[id] = checkbox.Checked;
}
}
}
protected void rpPersons_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
var item = e.Item.DataItem;
var checkbox = (CheckBox)e.Item.FindControl("chbSelected");
if (item != null && checkbox != null)
{
//get person id from our helper anonymous type
System.Reflection.PropertyInfo[] anonymousTypeProperties = item.GetType().GetProperties();
int id = (int)anonymousTypeProperties.Where(x => x.Name == "Id").FirstOrDefault().GetValue(item, null);
//set custom attribute on checkbox to map checkbox with person
checkbox.Attributes["personId"] = id.ToString();
}
}
}
}
}
Default.aspx
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="RepeaterCheckbox._Default" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Repeater runat="server" ID="rpPersons" OnItemDataBound="rpPersons_ItemDataBound" >
<ItemTemplate>
<p>
<asp:CheckBox ID="chbSelected" runat="server" AutoPostBack="false" Checked='<%# DataBinder.Eval(Container.DataItem, "Selected") %>' />
<asp:Label ID="lblName" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Name") %>' />
</p>
</ItemTemplate>
</asp:Repeater>
<div>
<asp:TextBox ID="txbName" runat="server" />
<asp:Button ID="btnAddPerson" runat="server" Text="Add person" OnClick="btnAddPerson_Click" />
</div>
</div>
</form>
</body>
</html>

It depends how do you approach it. Are you using the asp.net repeater in an Ajax update panel?
If is the case you can save check box value at each click event this way when you add a new item the control will be rebinded with the updated values.
If you like to use client side javascript thie post could help you:
How to add rows to a repeater in client side

how to do postback Javascript, jquery

<asp:Button ID="btn" OnClientClick="if(confirm_delete()){
/* post back*/
}else{
return false;
};" OnClick="btnDelete_Click" runat="server" Text="delete"/>
Hi I have this code but I cant do postback for it, im not sure how to?
is it:
<script type="text/javascript">
function CallServer() {
__doPostBack('not sure what goes here','or here');
}
</script>
Then:
<asp:Button ID="btn" OnClientClick="if(confirm_delete()){
/CallServer()/
}else{
return false;
};" OnClick="btnDelete_Click" runat="server" Text="delete"/>
My other script:
<script type="text/javascript">
function confirm_delete()
{
if (confirm("Are you sure you want to delete this comment?")==true)
return true;
else
return false;
}
</script>
EDIT:
On the server side i dynamically add a div to my page with content from my database for each content there is a new div will be added, each div is then refrenced with idWallPosting (so i can call my delete function)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.Odbc;
using System.IO;
public partial class UserProfileWall : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//btn.Visible = false;
string theUserId = Session["UserID"].ToString();
PopulateWallPosts(theUserId);
}
private void PopulateWallPosts(string userId)
{
using (OdbcConnection cn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver}; Server=localhost; Database=gymwebsite2; User=root; Password=commando;"))
{
cn.Open();
using (OdbcCommand cmd = new OdbcCommand("SELECT idWallPosting, wp.WallPostings, p.PicturePath FROM WallPosting wp LEFT JOIN User u ON u.UserID = wp.UserID LEFT JOIN Pictures p ON p.UserID = u.UserID WHERE wp.UserID=" + userId + " ORDER BY idWallPosting DESC", cn))
{
//("SELECT wp.WallPostings, p.PicturePath FROM WallPosting wp LEFT JOIN [User] u ON u.UserID = wp.UserID LEFT JOIN Pictures p ON p.UserID = u.UserID WHERE UserID=" + userId + " ORDER BY idWallPosting DESC", cn))
using (OdbcDataReader reader = cmd.ExecuteReader())
{
test1.Controls.Clear();
while (reader.Read())
{
System.Web.UI.HtmlControls.HtmlGenericControl div = new System.Web.UI.HtmlControls.HtmlGenericControl("div");
div.Attributes["class"] = "test";
div.ID = String.Format("{0}", reader.GetString(0));
// this line is responsible, problem here and my sqlsntax, im trying to set the SELECT idWallPosting for the div ID
Image img = new Image();
img.ImageUrl = String.Format("{0}", reader.GetString(2));
img.AlternateText = "Test image";
div.Controls.Add(img);
div.Controls.Add(ParseControl(String.Format("&nbsp&nbsp " + "{0}", reader.GetString(1))));
div.Attributes.Add("onclick", "return confirm_delete();");
div.Style["clear"] = "both";
test1.Controls.Add(div);
}
}
}
}
}
//protected void btnDelete_Click(object sender, EventArgs e)
//{
// string id = "ctl00_ContentPlaceHolder1_ContentPlaceHolder2_26";
// string[] idFragments = id.Split('_');
// id = idFragments[idFragments.Length - 1];
// //serverside code if confirm was pressed.
// using (OdbcConnection cn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver}; Server=localhost; Database=gymwebsite2; User=root; Password=commando;"))
// {
// cn.Open();
// using (OdbcCommand cmd = new OdbcCommand("DELETE FROM WallPosting WHERE idWallPosting = " + id + ")", cn))
// {
// cmd.ExecuteNonQuery();
// }
// }
// //PopulateWallPosts();
//}
protected void Button1_Click(object sender, EventArgs e)
{
string theUserId = Session["UserID"].ToString();
using (OdbcConnection cn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver}; Server=localhost; Database=gymwebsite2; User=root; Password=commando;"))
{
cn.Open();
using (OdbcCommand cmd = new OdbcCommand("INSERT INTO WallPosting (UserID, Wallpostings) VALUES (" + theUserId + ", '" + TextBox1.Text + "')", cn))
{
cmd.ExecuteNonQuery();
}
}
PopulateWallPosts(theUserId);
}
protected void btn_Click(object sender, EventArgs e)
{
string id = "ctl00_ContentPlaceHolder1_ContentPlaceHolder2_26";
string[] idFragments = id.Split('_');
id = idFragments[idFragments.Length - 1];
//serverside code if confirm was pressed.
using (OdbcConnection cn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver}; Server=localhost; Database=gymwebsite2; User=root; Password=commando;"))
{
cn.Open();
using (OdbcCommand cmd = new OdbcCommand("DELETE FROM WallPosting WHERE idWallPosting = " + id + ")", cn))
{
cmd.ExecuteNonQuery();
}
}
//PopulateWallPosts();
}
}
On my asp.net html side i have:
<script type="text/javascript">
function confirm_delete()
{
if (confirm("Are you sure you want to delete this comment?")==true)
return true;
else
return false;
}
</script>
<p>
<asp:Button ID="btn" OnClientClick="return confirm_delete();" runat="server"
CssClass="Btn" Text="delete" onclick="btn_Click"/>
<asp:TextBox ID="TextBox1" name="TextBox1" runat="server" Rows="3"
Height="47px" Width="638px"></asp:TextBox>
</p>
<p>
<asp:Button ID="Button1" runat="server" Text="Post Message" Width="98px"
onclick="Button1_Click" />
</p>
<p>
</p>
<style type="text/css">
img {border-width:0px; width:100px; height:100px;}
</style>
<div id="test1" runat="server" />
</div>
</asp:Content>
If you notice in my server side code I added this line:
div.Attributes.Add("onclick", "return confirm_delete();")
This works any time I click on my div the confirm_delete is called.
What I was trying to do with my asp.net button was when the div was clicked I could then call the onclick btnDelete_click.

OnClientClick="return confirm_delete();"
That's it...
Edit: __doPostBack works also...
OnClientClick="if(confirm('delete?'))__doPostBack('btn',''); else return false;"

If you really are wanting to manually call __doPostBack(), the first parameter is the .NET generated name for the control. This can be gotten on the server side using Control.ClientID. The second parameter is any extra data that should be passed along in the request. Most of the time I see this field is an empty string.
__doPostBack('ctl100$controlName$id','');
The controlName is the .NET class name of the control I believe, id is the ID you gave the control. To be sure, view the source of the page after it has been rendered in the browser and search for calls to __doPostBack and see how they are formatted.

By a postback in this case do you want to just refresh the page? If so then it would just be:
location.reload();
in your case:
<script type="text/javascript">
function CallServer()
{
location.reload();
}
</script>
Demo (A button click prompts the user to confirm - if they choose Yes, a post back occurs)
See demo here!

One method, not the best for sure:
Add a button into an update panel and set it invisble.
Then call click() method of the button.
Somthing like this:
document.getElementById('button').click();