I have hidden value:
<input type="hidden" name="orderRef" value="<%=orderRef%>" />
and I have a asp button, and i want to pass this param to aspx.cs function:
<asp:Button ID="submitForFree" runat="server" OnCommand="btnPromoBtn_Click" CommandArgument="<%=orderRef%>" class="primary-button" Text="PayNow"></asp:Button>
but in the function it show me a string "<%=orderRef%>"
How can i put it in CommandArgument?
You have two options
Set it in the code behind
Instead of trying to set it in the markup, set it in your codebehind, some time after OnInit.
this.submitForFree.CommandArgument = orderRef;
Read it from the request
Instead of passing the value in CommandArgument, just read it from the HttpRequest, where the hidden variable is exposed in Request.Form.
protected void btnPromoBtn_Click(EventArgs e, object sender)
{
//var arg = e.CommandArgument;
var arg = Request.Form["orderRef"];
DoSomethingWithCommandArgument(arg);
}
You can bind the CommandArgument like this:
CommandArgument='<%# orderRef %>'
But if your button is outside a Repeater, GridView, ListView etc you need to call DataBind manually every time the page is loaded.
protected void Page_Load(object sender, EventArgs e)
{
submitForFree.DataBind();
}
Related
i am trying to set the value of a textbox control in my aspx page as the value of a label text. I am using the following code but nothing happens. I have tried from the code behind file using c# and then I want to assign the textbox value to a session variable. If I just assign a string value like "Hello"it works, but otherwise nothing works.
protected void btnBook_Click(object sender, EventArgs e)
{
txtmtcid.Text = blbtest.Text;
Session["mtcid"] = txtmtcid.Text;
//Response.Redirect("booknow.aspx");
}
}
I also tried with Javascript, but no use:
var mtcid = parsedData.employeeCode;
document.getElementById('txtmtcid').value = mtcid;
The above js code works fine if I am assigning the value of mtcid to a label text, but not for the text box. please help.
You don't show things that could be messing this up.
and we can't see your markup used.
What does your page load event look like. Keep in mind that EVERY button click, post-back or ANY control on the page with a event code stub WILL RUN the page load event EVERY time. the page load event runs every time, and BEFORE your button click code runs.
So, if I have this markup:
<asp:Label ID="blbtest" runat="server" Text="zoo"></asp:Label>
<br />
<asp:TextBox ID="txtmtcid" runat="server"></asp:TextBox>
<br />
<br />
<asp:Button ID="Button1" runat="server" Text="Button"
onclick="Button1_Click" />
<br />
And then code behind of this:
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
txtmtcid.Text = blbtest.Text;
}
I then get this when I click on the button
So, we can see how the lable text is now copy to the text box.
You have to post more markup, and give futher detilas (such as some grid view, repeater or any other boatload of features that well explain your issue).
Note that you can double click on the button in the web forms designer to create a event click for the button. Its possible that no event code for the button exists, and your button click code and code behind never runs.
So this is the markup:
<asp:Label ID="blbtest" runat="server" ClientIDMode="Static">
</asp:Label>
<asp:Button ID="btnBook" runat="server" Text="Book Now"
CssClass="spaces-info__button" OnClick="btnBook_Click"/>
<asp:TextBox ID="txtmtcid" runat="server">
</asp:TextBox>
Code behind:
protected void Page_Load(object sender, EventArgs e)
{
if (!(Session["username"] == null))
{
string usn = Session["username"].ToString();
lblusn.Text = usn;
}
}
protected void btnBook_Click(object sender, EventArgs e)
{
txtmtcid.Text = blbtest.Text;
Session["mtcid"] = txtmtcid.Text;
Response.Redirect("booknow.aspx");
}
updated js:
$(function () {
//dom is ready
var request = new XMLHttpRequest;
var usn = document.getElementById('lblusn').innerHTML;
//var usn = "juhaina.ahmed";
console.log(usn);
request.open('GET', "URL" + usn + ""); //of course I have replaced
the URL here
request.onload = function () {
var response = request.response;
var parsedData = JSON.parse(response);
console.log(parsedData);
var nm = parsedData.fullName;
document.getElementById('lblfullnm').innerHTML = nm;
var mtcid = parsedData.employeeCode;
document.getElementById('blbtest').innerHTML = mtcid;
document.getElementById('txtmtcid').value =
document.getElementById('blbtest').innerHTML
};
request.send();
});
I am new to js, and asp.net, so trying to browse whatever possible and work things out here. The session variable value is just not getting passed to next page. Honestly, i dont need the textbox, I dont know if label text can be stored in session variables. If thats possible, then all I want to do is assign the blbtest label text to the session variable, but that also didnt work,but if I am hard coding it like:
Session["mtcid"]="D-11234"
this works and the value of session variable is passed.
hence I am trying now with textbox. Please let me know if theres a better approach to this.
If there is a way to avoid the use of the label and textbox and simply pass the session variable, Session["username"] from the code behind to the javascript, that would be great. how can I do it?
I have a custom control which inherits from TextBox.
This allows me to use the TextBox's AutoPostBack property. This property makes the Page_Load method on the parent page fire when I change the value and click out of the text box.
I am setting the value of the rendered text box in JS as follows
var outputData = document.getElementById("CameraScannerTextbox1");
outputData.value = barcode.Value;
When this code runs I am expecting the Page_Load method to run again.
I have tried things like
outputData.focus();
outputData.value = barcode.Value;
outputData.blur();
The code in the Page_Load is
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
Label1.Text = CameraScannerTextbox1.Text;
}
}
So basically I am hoping to have whatever is in barcode.Value set on Label1.Text on the server.
All you need is to trigger onchange event for input since ASP.NET adds postback code to onchange attribute. The simplest way is calling onchange manually
var outputData = document.getElementById("CameraScannerTextbox1");
outputData.value = barcode.Value;
outputData.onchange();
For more advanced techniques of simulating onchange event see this and this answers.
You can simply trigger the PostBack yourself with __doPostBack.
<asp:TextBox ID="CameraScannerTextbox1" runat="server" ClientIDMode="Static" AutoPostBack="true"></asp:TextBox>
<asp:PlaceHolder ID="PlaceHolder1" runat="server">
<script>
var outputData = document.getElementById("CameraScannerTextbox1");
outputData.value = '123456';
__doPostBack('CameraScannerTextbox1', '');
</script>
</asp:PlaceHolder>
Code behind
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
Label1.Text = CameraScannerTextbox1.Text;
PlaceHolder1.Visible = false;
}
}
Not that I placed the javascript in a PlaceHolder that is hiddedn on PostBack, otherwise it will create a PostBack loop. But there are other ways to prevent that also.
I have created one page.In that page,I wrote one javascript function for displaying character count,when user enter something in textbox.
protected void Page_Load(Object sender, EventArgs e)
{
TextBox1.Attributes.Add("onkeyup", "DisplayCharCount()");
}
First time pageload,textbox is blank. Textbox does not have autopostback== true.After
pageload,user enter text into textbox.This time page is not loaded again.So when this function get called?
Page_Load will call everytime a page reloaded. so onkeyup will bind to the textbox everytime a page reloaded.
When this function get called?
This event is triggered when the user releases a Key while typing on TextBox1.
You can also bind it for the first time only:
protected void Page_Load(Object sender, EventArgs e)
{
if(!IsPostBack)
{
TextBox1.Attributes.Add("onkeyup", "DisplayCharCount()");
}
}
Or you can also bind it directly as:
<asp:TextBox ID="TextBox1" runat="server" TextMode="MultiLine" onkeyup="DisplayCharCount()">
</asp:TextBox>
The Page_Load method is called every time a user requests the page. The DisplayCharCount method is called whenever a user pressed a key (that is, release the key) in the TextBox1 element.
I currently have a listview on an ASP.NET webpage that displays "cottage" records from an Access database. The name of each cottage is displayed as a hyperlink so when clicked brings you to another webpage:
<li style="">Name:
<asp:Hyperlink ID="Cottage_NameLabel" NavigateURL="~/Cottage.aspx"
runat="server" Text='<%# Eval("Cottage_Name") %>' />
<br />
This works perfectly fine when selecting a hyperlink. What I want the system to do is to set the value of a publically declared variable (set in a module) to the Cottage_Name of the selected hyperlink. So say if i clicked on a hyperlink that said "cottage1", the public variable is set to "cottage1" and then the navigate URL opens the next webpage.
Would really appreciate it if anyone could help me do this!
Just use a LinkButton instead of a Hyperlink... Catch the click event and do whatever you want...
For instance:
<asp:LinkButton ID="Cottage_NameLabel" runat="server" Text="whatever" onclick="Cottage_NameLabel_Click" />
Then in CodeBehind:
protected void Cottage_NameLabel_Click(object sender, EventArgs e)
{
LinkButton btn = (LinkButton)sender;
Session["MyCottageName"] = btn.Text;
Response.Redirect("Cottage.aspx");
}
In your Cottage.Aspx page you can check the value of the Session variable like this:
protected void Page_Load(object sender, EventArgs e)
{
if (Session["MyCottageName"] != null)
{
string name = (String)Session["MyCottageName"];
...
}
You can pass the name as a querystring variable to the page. If you go this route, you need to make sure you URL encode the cottage name:
<a href='/Cottage.aspx?name=<%# Server.UrlEncode(DataBinder.Eval(Container.DataItem, "Cottage_Name")) %>'><%# Eval("Cottage_Name") %></a>
And then on cottage.aspx you can get the cottage name:
Dim cottageName As String = Request.QueryString("name")
This would be preferable to a button or other postback solution as it removes the need for a postback and then a redirect.
i have seen some code in which people pass parameter through commandParameter Property of web control.then what is use of eventargs.
This can be useful if you have the same EventHandler method for different buttons. Example, say your markup looks like this:
<asp:Button ID="button1" runat="server" CommandArgument="MyVal1"
CommandName="ThisBtnClick" OnClick="MyBtnHandler" />
<asp:Button ID="button2" runat="server" CommandArgument="MyVal2"
CommandName="ThatBtnClick" OnClick="MyBtnHandler" />
You can have the same event handler for both buttons and differentiate based on the CommandName:
protected void MyBtnHandler(Object sender, EventArgs e)
{
Button btn = (Button)sender;
switch (btn.CommandName)
{
case "ThisBtnClick":
DoWhatever(btn.CommandArgument.ToString());
break;
case "ThatBtnClick":
DoSomethingElse(btn.CommandArgument.ToString());
break;
}
}
Source: aspnet-passing-parameters-in-button-click-handler
Various Button type controls in .NET have an OnCommand event as well as an OnClick event. When using the OnCommand event you have additional parameters you can apply to the Button such as CommandName and CommandArgument. These can then be accessed in the CommandEventArgs.
It is useful in places where you want to assign the same method to multiple buttons and use the CommandName and CommandArgument parameters to indicate what functionality clicking that button will produce.
The EventArgs class is a base class. Other web methods use other Event args.
e.g. a LinkButton has an OnClick event with a default EventArgs parameter, but it also has an OnCommand event that takes a CommandEventArgs : EventArgs parameter which has some extra information (namely CommandName & CommandArgument).
The event args base class is just there as a place holder so that all the EventHandlers conform to a similar signature.