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Good morning,
I have the following asp Image and would like to add the on mouse over event, as follow:
<asp:Image ID="MapImage" runat="server" Height="601px" Width="469px" OnMouseOver="OnMouseOverMap"/>
I have also added the following method on the C# code:
protected void OnMouseOverMap(object sender, EventArgs e)
{
int i = 9;
}
I also have created the same method without the parameters but I cannot manage to call that C# function.
Can somebody help me with this issue?, How can I do to call the C# function from the ASP code.
Cheers!
There is no OnMouseOver server-side event on asp:Image object.
What you can do you can write js function called on client-side onmouseover event and inside that function trigger click on hidden button or you can change Image to ImageButton and trigger click on that image.
<asp:Image ID="MapImage" runat="server" Height="601px" Width="469px" onmouseover="javascript:foo()"/>
<asp:Button ID="Button1" runat="server" style="display:none" OnClick="OnMouseOverMap" />
And in js function:
function foo()
{
document.getElementById('<%= Button1.ClientID %>').click();
}
I am pretty sure that you are supposed to insert javascript code there and not a "code behind event handler reference". See ASP NET image onmouseover not working for example.
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I have 3 css files (File.css,File2.css,File3.css) with same class name "BkImg" which changes the background image of the page and depending upon some condition in my codebehind page I want to link one of these file.
In my aspx body tag ().
I am using C# as code behind language
Similar to this question.
An adaptation of an answer on that question..
You can use the Page_Init function in your code behind file to dynamically generate the link and add it to your page header (or body, in your case). An example of that function is below in C#. You would, of course, implement your logic to change the Href value.
protected void Page_Init(object sender, EventArgs e)
{
var link = new HtmlLink();
link.Href = "~/styles/main.css";
link.Attributes.Add("rel", "stylesheet");
link.Attributes.Add("type", "text/css");
Page.Body.Controls.Add(link);
}
Make sure that you put a runat="server" in the body tag so that you can reference the body from the code behind file.
<body runat="server">
</body>
First add 'id' and 'runat' property for body tag.
<body id="mybody" runat="server">
then you can add your calss dynamically with page_load event or another event.
protected void Page_Load(object sender, EventArgs e)
{
mybody.Attributes.Add("class", "classname();");
}
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I have created a program that runs through a flow using C#
At the moment it contains a large amount of buttons to make certain panels visible etc.
I was wondering if I could make the page refresh when the user checks a checkbox?
You need to set the CheckBox' AutoPostBack-property to true(default is false).
<asp:CheckBox id="checkbox1" runat="server"
AutoPostBack="True"
Text="Check/uncheck me for a postback"
OnCheckedChanged="Check_Clicked"/>
IF you want to refresh your panel on check of checkbox, you can do something like below:-
<asp:CheckBox id"chkVisible" runat="server" AutoPostBack="true" OnCheckedChanged="chkVisible_OnCheckedChanged" Text="Test for Page referesh" />
You need to set AutoPostBack property to True for refreshing your page.
Try this :
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//do whatever you want to on first time page load
}
}
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I am working on an asp.net application. I need a drop downlist where user can select multiple items from dropdown. Also, the number of selections allowed should be controlled by code.
Please suggest
For that you want you could use a ListBox. You can't use a DropDownList, because a DropDownList is used for the selection of a unique option. In other words, you can't select more than one of the provided options. As it is stated here, DropDownList class
Represents a control that allows the user to select a single item from a drop-down list.
On the other hand for a ListBox class we have that
Represents a list box control that allows single or multiple item selection.
For more information about ListBox, please have a look here.
Here's a solution using jQuery:
jQuery
<script>
$(document).ready(function () {
$('#BeerSelection').change(function () {
var $BeersSelected = $('#BeerSelection').val().length;
if ($BeersSelected > 3) {
alert("Hey Bro, you've selected too many beers");
}
});
});
</script>
aspx code
<asp:ListBox runat="server" ID="BeerSelection" SelectionMode="Multiple">
<asp:ListItem>Yuengling</asp:ListItem>
<asp:ListItem>Budwiser</asp:ListItem>
<asp:ListItem>Blue Moon</asp:ListItem>
<asp:ListItem>Coors Light</asp:ListItem>
<asp:ListItem>Chimay</asp:ListItem>
</asp:ListBox>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit />
I suggest you use this tutorial for dropdownlist: dropdownlist tutorial, it works fine :)
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I have some customers in a gridview. When I click on the customers I can get their names in a textbox. There is also a corresponding pdf document which should also be available if the user desires.
My problem is that I need to know who to open a pdf document using C# and asp.net. I have to use a variable name as the name of pdf document, for example when the click on a button "open variable CustomerName.pdf".
I need to open a pdf file in a new window for viewing
thanks
this works
asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl="~/customerUnit/Customer.pdf" Target="_blank">HyperLink
But I want to pass the pdf file as a variable "Customer.pdf" should be "VaribleCustmer.pdf"
I agree with #Ahmed from the comments, you shouldn't over-think this:
Simply link to the CustomerName.pdf if your using a hyperlink.
Simply redirect to the CustomerName.pdf if your using a button
But I want to pass the pdf file as a variable "Customer.pdf" should be "VaribleCustmer.pdf"
Asp Markup:
<asp:HyperLink ID="HyperLink1"
runat="server" Target="_blank">
Code behind:
var pdfFile = "Customer.pdf"; //or VaribleCustmer.pdf
HyperLink1.NavigateUrl= String.Format("~/customerUnit/{0}", pdfFile);
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I have an image and I want to get image url with method .I found this questions on the web.But answer not quite.
Source as follows:
<img id="largeImage" src='<%#ShowLast() %>' alt="" />
cs file as follows:
public string ShowLast()
{
using (DBMLDataContext dc=new DBMLDataContext())
{
var query = (from d in dc.News
select d).Last();
return query.Photo.ToString();
}
}
Whats happening? If you are using this inside a databound control then <%# is right. If not you will want to use <%= or better yet one of the variations that encode the output.
Based on your comments it sounds like you should just use an <asp:Image> control and then set its ImageUrl property in the codebehind.
Markup:
<asp:Image runat="server" id="largeImage" GenerateEmptyAlternateText="True" />
Code Behind:
// in page load
largeImage.ImageUrl = ShowLast();
The only gotcha I can think of with this approach is if you are using the id "largeImage" in your css or somesuch. Converting it to an asp.net control means it will take control of the ID so you will need to target it through your css with a CssClass property or if you are using a modern version of .net you also have some other options to set the ID to a static id - I'll update again if this is an issue.
You can call the method like this
<img id="largeImage" src='<%= ShowLast() %>' alt="" />
if method is returning URL in string