Develop Reference

Insert HTML at CodeBehind, WebForm C#?

i have a method that generate tools based on the number value inserted, and I have another control called "DateTimePicker" that does the job of providing a textbox and the date+time picker function.
However, now the problem is that when i call dynamic_tools method and inserted the value "4" and "addInfoPanel" to the method.
The html code does not generating anything in the panel.
But, when i tried this html, it works.
lit.Text = #"<div class='errorMessage'>The user ID or password you entered does not match our records. Please try again. <br />
You may also securely recover your <a href='#'>User ID</a> or reset your <a href='#'>Password</a> online.
</div>";
I'm not too sure what is the reason behind this. I'm suspecting whether is it because of the custom control that i have created? any help is much appreciated. Thanks
Here's the code:
DateTimePicker.ascx.cs -> taken from https://github.com/jiestrada/DateTimePicker
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class DateTimePicker : System.Web.UI.UserControl
{
public string DateTime
{
get { return txtDateTime.Text; }
}
protected void Page_Load(object sender, EventArgs e)
{
DateTimePicker picker = this;
ScriptManager.RegisterClientScriptBlock(picker, picker.GetType(), "message", "<script type=\"text/javascript\" language=\"javascript\">getDateTimePicker();</script>", false);
}
}
DateTimePicker.ascx -> taken from https://github.com/jiestrada/DateTimePicker
<%# Control Language="C#" AutoEventWireup="true" CodeFile="DateTimePicker.ascx.cs"
Inherits="DateTimePicker" %>
<style type="text/css">
.textBox
{
width: 150px;
border-radius: 4px 4px 4px 4px;
color: #555555;
display: inline-block;
font-size: 14px;
height: 20px;
line-height: 20px;
margin-bottom: 10px;
padding: 4px 6px;
vertical-align: middle;
background-color: #FFFFFF;
border: 1px solid #CCCCCC;
box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075) inset;
transition: border 0.2s linear 0s, box-shadow 0.2s linear 0s;
font-family: Helvetica Neue,Helvetica,Arial,sans-serif;
}
</style>
<script type="text/javascript" language="javascript">
function getDateTimePicker()
{
$('#datetimepicker').DateTimePickerNew({
format: 'dd/MM/yyyy hh:mm:ss',
language: 'en'
});
}
</script>
<div id="datetimepicker" class="input-append date">
<asp:TextBox ID="txtDateTime" CssClass="textBox" runat="server"></asp:TextBox>
<span class="add-on"><i data-time-icon="icon-time" data-date-icon="icon-calendar"></i>
</span>
</div>
<script type="text/javascript" language="javascript">
$('#datetimepicker').DateTimePickerNew({
format: 'dd/MM/yyyy hh:mm:ss',
language: 'en'
});
</script>
Dynamic Tools Method
protected string dynamic_tools(int key, PlaceHolder panel)
{
if (key == 4)
{
string value = "dtp"+i;
Literal lit = new Literal();
lit.Text = #"<td><DateTime:DateTimePicker ID='DateTimePicker' runat='server' /></td>";
panel.Controls.Add(lit);
}
}
HTML CODE
<%# Register Src="~/Control/DateTimePicker.ascx" TagName="DateTimePicker" TagPrefix="DateTime" %>
<div id="wrapper">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="singtelUpdatePanel" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:PlaceHolder ID="addInfoPanel" runat="server" Visible="false"></asp:PlaceHolder>
</ContentTemplate>
</asp:UpdatePanel>
</div>

DateTimePicker dtp = new DateTimePicker();
dtp.ID = "someID";
//Add some attributes else, if you need. Such as a width, height, so on.
panel.Controls.Add(new LiteralControl("<td>"));
panel.Controls.Add(dtp);
panel.Controls.Add(new LiteralControl("</td>"));

Image is not appearing when Showing a Div with loading image during Postbacks ASP.net

I am intending to show a Div with loading image during page post-backs to inform the user about a runing operation. I am using a simple javascript function that shows the div, when I call this JavaScript from an html input button (without postback), the div is appearing normally. But when I use it with a post-back button, (by setting its OnClientClick property), the div is appearing, but without the image unloaded (showing as a box with unloaded image). I am not able to figure where the problem is, I even tried adding the image as a hidden html control so that it is preloaded before the post-back, but with no prevail. Here is my aspx code:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript" language="javascript">
function PleaseWait(message) {
message = message ? message : PleaseWaitDefaultMessage;
var dsoctop = document.all ? window.document.body.scrollTop : window.pageYOffset;
var el = document.getElementById("PleaseWaitDiv");
el.style.top = (dsoctop + 100) + "px";
el.style.left = "0px";
el.innerHTML = "<div style='background-color:white;border: solid 0px black; width:100%;'><img src='" + WebSiteBaseURL + "Images/bigrotation2.gif' /><h3>" + message + "</h3></div>";
el.style.display = "";
}
</script>
<asp:Literal ID="InitLiteral" runat="server" EnableViewState="false"><script>var PleaseWaitDefaultMessage = "{0}"; var WebSiteBaseURL = "{1}"; </script>
</asp:Literal>
</head>
<body>
<form id="form1" runat="server">
<div>
<div id="PleaseWaitDiv" style="width: 100%; position: absolute; top: 0px; display: none;
text-align: center; z-index: 2; max-width: 1024px; min-width: 600px; height: 260px;
overflow: hidden; background: #fff; margin: 0 auto; left: 0; right: 0;">
</div>
<asp:Button ID="btnTestPleaseWait" runat="server" OnClientClick="PleaseWait();"
Text="Test Please wait with postback" onclick="btnTestPleaseWait_Click"
/>
<input type="button" onclick="PleaseWait();" value="Test Please wait no postback" />
</div>
</form>
</body>
</html>
and here is my code behind:
protected void Page_Load(object sender, EventArgs e)
{
InitLiteral.Text = string.Format(InitLiteral.Text, "Please Wait.....", Page.ResolveClientUrl("~/"));
}
protected void btnTestPleaseWait_Click(object sender, EventArgs e)
{
System.Threading.Thread.Sleep(5000);
}

I had same problem. I solved it by loading same image in another img tag with style="dispaly:none" attribute. (Don't do visible="false")
Img tag with display:none forces browser to load image when page is loaded.
I think the problem occurs because POST request gets sent before loading div comes into existence, therefore the GET request for IMG is sent immediately AFTER POST request is sent, and because server is busy processing POST request it takes time to respond because of which browser fails to display the image.
Hope this helps!

HTML button type and commandname in asp.net

I am trying to assign commandname to HTML button but obviously it doesn't work very well. This is what I am trying to achieve:
<button type="submit" class="btn btn-info right" CommandName="Login" runat="server" id="loginBtn"><span class="icon16 icomoon-icon-enter white"></span> Login</button>
<asp:Button ID="btnLogin" CommandName="Login" runat="server" CssClass="btn btn-info right" Text="Login" />
The styling for some reason doesn't work on the asp button but it does for the HTML button. Now I want to somehow assign the commandname property to the HTML button if its possible. Is that doable?

CommandName is only available for Button Server Control; not in html button.
However, you can use LinkButton and style it the way you want it.
<asp:LinkButton ID="btnLogin" class="button" runat="server"
CommandName="Login"><span>Login</span></asp:LinkButton>
.button
{
background: transparent url('/Images/ButtonLeft.gif') no-repeat top left;
display: block;
float: left;
line-height: 11px; /* 21px (Button Background) = 5px (padding-top) + 11px (font-size) + 5px(padding-bottom) */
height: 21px; /* Button Background Height */
padding-left: 9px;
text-decoration: none;
font-weight: bold;
color: white;
font-size: 11px;
}
a:link.button, a:visited.button, a:active.button
{
color: white;
text-decoration: none;
margin-right: 10px;
}
a.button:hover
{
background-position: bottom left;
}
a.button span, a.button span
{
background: transparent url('/Images/ButtonRight.gif') no-repeat top right;
display: block;
padding: 5px 9px 5px 0; /*Set 9px below to match value of 'padding-left' value above*/
}
a.button:hover span
{
background-position: bottom right;
color: white;
}

I used google to find an answer to this question; however since I've found more complete answers I am also answering this question even though it's older (in case any other googlers find it).
In asp.net you can use the DataControlCommands class to implement the following functionality:
Cancel
Delete
Edit
First
Insert
Last
New
Next
Page
Prev
Select
Sort
Update
Which means :
<asp:LinkButton runat="server" CommandName="Cancel" Text="Cancel" CausesValidation="false" />
among other things.
It's in the library entries for System.Web.UI.WebControls (msdn.microsoft.com)
Yes you could just put in the html and have it work fine- however if you're building something like a dynamic entity site (etc), then it's worth it to take the time to learn how asp.net does it inherently (imo).

Better if you put HiddenField in htmlbutton and then Find child
<button runat="server"
ClientIDMode="Static"
class="btn btn-success"
ID="button_recalculate"
OnServerClick="button_recalculate_OnClick"
>
<asp:HiddenField runat="server" ID="hidden" Value=<%#Eval("ID") %>/>
Voir
</button>
Server
try
{
var type = (HtmlButton) sender;
var child = type.FindControl("hidden");
var id = ((HiddenField) child).Value.TransformToInt();
SendValueToServer(id);
}
catch (Exception)
{
//
}

image in div via codebehind

I'm trying to achieve setting my image inside my div id =test this has became extremely problematic:
cn.Open();
using (OdbcCommand cmd = new OdbcCommand("SELECT Wallpostings FROM WallPosting WHERE UserID=" + userId + " ORDER BY idWallPosting DESC", cn))
{
using (OdbcDataReader reader = cmd.ExecuteReader())
{
var divHtml = new System.Text.StringBuilder();
while (reader.Read())
{
Image img = new Image();
img.ImageUrl = "~/userdata/2/uploadedimage/batman-for-facebook.jpg";
divHtml.Append("<div id=test>");
divHtml.Append(img + String.Format("{0}", reader.GetString(0)));
// how can I append an img inside my div id=test?
// the image must stay at the start of the div id=test + the contents(text) from my database (in that order)
divHtml.Append("</div>");
}
test1.InnerHtml = divHtml.ToString();
}
}
}
}
css:
* { padding: 0; margin: 0; outline: 0; }
body {
font-size: 12px;
line-height: 1.2;
font-family: Arial, "Trebuchet MS", sans-serif;
color: #a0a0a0;
background: url(images/bg.gif) repeat 0 0;
text-align: left;
}
div#test1 {
}
div#test
{
width:90%;
z-index:1;
padding:27.5px;
border-top: thin solid #736F6E;
border-bottom: thin solid #736F6E;
color:#ffffff;
margin:0 auto;
white-space: pre;
white-space: pre-wrap;
white-space: pre-line;
}
Asp html:
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
<link href="css/style.css" rel="stylesheet" type="text/css" />
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder2" Runat="Server">
<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.5.1.min.js" type="text/javascript"></script>
<p>
<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>
<div id="test1" runat="server" />
// contents from my code go inside this div as div id=test
</asp:Content>
Firebug output:
<div id="ctl00_ContentPlaceHolder1_ContentPlaceHolder2_test1"><div id="test">System.Web.UI.WebControls.Imageweeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee</div><div id="test">System.Web.UI.WebControls.Imagehello</div><div id="test">System.Web.UI.WebControls.Imagestill trying</div><div id="test">System.Web.UI.WebControls.Imageback to front on comments</div><div id="test">System.Web.UI.WebControls.Imageback to front on comments</div><div id="test">System.Web.UI.WebControls.Imageback to front on comments</div><div id="test">System.Web.UI.WebControls.Imageback to front on comments</div><div id="test">System.Web.UI.WebControls.Imagelets try this again</div><div id="test">System.Web.UI.WebControls.Imagehair marry went up the hill</div><div id="test">System.Web.UI.WebControls.Imagewedfwedwe</div><div id="test">System.Web.UI.WebControls.Imagewedfwedwe</div><div id="test">System.Web.UI.WebControls.Imagekjgfkjh</div><div id="test">System.Web.UI.WebControls.Imageanother comment</div><div id="test">System.Web.UI.WebControls.Imagebla bla hope this works</div></div>
I know the reason why my code outputs the actual text of the web ui controls, I have had in another post code that actually gets the image up but it adds the image onto the "END" of the test div so rather than it look like this:
<div id="ctl00_ContentPlaceHolder1_ContentPlaceHolder2_test1">
<div id="test"><img src=blabla></img> the text goes after the image </div>
It looks like this:
<div id="ctl00_ContentPlaceHolder1_ContentPlaceHolder2_test1">
<div id="test"> text comes before image </div>
<img src=blabla></img>
<div id="test">hello</div>
<img src=blabla></img>
Which isn't what I want, the code I've added although I know the reasons why it outputs the web controls text is just a demonstration of "how" I'm trying to get it to work.
divTest.Append on img THEN text;
Of course I cant append I would have to use controls.add but I still couldn't get it to work.
Previous post is here so you can see some images and some ideas:
My code below gives me a problem, the image comes after the text

Image is a web control. You can't stick it in a StringBuilder.

'Please wait' screen between pages in C# ASP.NET. Best practice?

I have a gridview with some imagebuttons, each of which kicks off a report page for that item. The report take 10-15 seconds to run, so I'd like a popup 'Generating report, please wait' type thing. I can think of a few ways but would like the opinion of those more experienced than I. The options I was considering:
a) link my imagebutton to an intermediate page that says 'please wait', and then refer it onto the report page from there. Seems a bit clunky
b) Investigate using jquery or similar. I have telerik controls, they have a few things but it isn't clear if any are suitable.
c) Define some kind of CSS layer with a please wait warning on it, and make it visible as part of the button's onclick event
d) Look into jquery or similar
Any thoughts?
Thanks!

I use Div with transparency, and its pretty cool and simple. Give it a try.
<div id="ModalPopup" style="visibility: hidden;">
<div style="position: fixed; width: 100%; height: 100%; z-index: 10002; background-color: Gray;
filter: alpha(opacity=70); opacity: 0.7;">
</div>
<table style="position: fixed; width: 100%; height: 100%; z-index: 10003;">
<tr>
<td align="center" valign="middle">
<div style="color: Black; font-weight: bolder; background-color: White; padding: 15px;
width: 200px;">
<asp:Image ID="Image3" runat="server" ImageUrl="~/Images/progress.gif" />
Procesando....
</div>
</td>
</tr>
</table>
</div>
To display the div, use this JavaScript:
document.getElementById('ModalPopup').style.visibility = 'visible';

I have the exact same problem before but I found the AJAX Server Control UpdateProgress very useful. Here's a link to UpdateProgress Control.

you can have an <iframe> on the page, of which its style is set to display:none. a button (which you will use to execute an action) will perform a javascript function that will set the style of the <iframe> to display:block on click.

please wait on page load in js can be used in any language give a try
in body place this code
<body>
<div id='loadingmsg' style='display: none;'></div>
<div id='loadingover' style='display: none;'></div>
</body>
in css
#loadingmsg {
width:100%;
height:100%;
position:fixed;
z-index:9999;
background:url("assets/img/loaders/load10.gif") no-repeat center center rgba(255,255,255,0);
}
#loadingover {
background: #23351f;
z-index: 99;
width: 100%;
height: 100%;
position: fixed;
top: 0;
left: 0;
-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=80)";
filter: alpha(opacity=80);
-moz-opacity: 0.8;
-khtml-opacity: 0.8;
opacity: 0.8;
}
js
<script>
document.onreadystatechange = function () {
var state = document.readyState
if (state == 'interactive') {
showLoading();
}
else if (state == 'complete') {
hideLoading();
}
}
function showLoading() {
document.getElementById('loadingmsg').style.display = 'block';
document.getElementById('loadingover').style.display = 'block';
}
function hideLoading() {
document.getElementById('loadingmsg').style.display = 'none';
document.getElementById('loadingover').style.display = 'none';
}
</script>