I need help on freezing gridview column header in asp.net.
I have tried to create a css code on page source code as displayed below:
<style type="text/css">
.Freezing
{
position:relative ;
top:expression(this.offsetParent.scrollTop);
z-index: 10;
}
</style>
And after that i called the css into page load of web form.
GridView1.CssClass = "Freezing"
Nothing happens whenever i debug the web application with above codes.
Thanks in advance.
You may using third party for database. Below are the url
http://datatables.net/
you can use this jquery plugin https://github.com/laertejjunior/freezeheader/
in your asp.net page:
<script language="javascript" type="text/javascript">
$(document).ready(function () {
$("table").freezeHeader();
});
</script>
if your page work with ajax, add this script in the end of page, to the script continue working after postback
<script type="text/javascript" language="javascript">
var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_endRequest(EndRequestHandler);
function EndRequestHandler(sender, args) {
$("table").freezeHeader();
}
</script>
see demo in https://github.com/laertejjunior/freezeheader/
I hope this helps.
I am creating a ASP.net web application where i need to add different text boxes data and save it in another text box .But using java Script and onblur event. How can we do please say in clear and understanding way because am new to It.
Thanks
You could use jQuery's blur event:
$('#TextBox1').blur(function() {
alert('Handler for .blur() called.');
});
To expand on this and do some calculation/set the value of another textbox we could do something like:
<script type="text/javascript">
$(document).ready(function () {
$("input[id$=TextBox1]").blur(function() {
$("input[id$=TextBox2]").val('Some text')
});
});
</script>
i want to have retrieve a "imagetype" from appsettings in my web.config in javascript . how can i do that?
You can use following code in your page markup:
<script language="JavaScript" type="text/javascript">
var type = '<%= ConfigurationManager.AppSettings["imagetype"] %>';
</script>
Use the following:
var value = System.Configuration.ConfigurationManager.AppSettings["imagetype"];
You may find that for it to work you need to add a reference to System.Configuration.dll if you don't already have one.
Create a new page, and in Page_Load put the line so that it all reads:
Response.Clear();
var value = System.Configuration.ConfigurationManager.AppSettings["imagetype"];
Response.Write(value);
Response.End();
You can now make an AJAX call to the page from Javascript, perhaps using ExtJs and the text will be returned to your javascript.
Alternatively, you could put the following into your page:
<script language="javascript" type="text/javascript">
var appSettingValue = '<%=System.Configuration.ConfigurationManager.AppSettings["imagetype"]%>';
// The variable "appSettingValue" will contain the string from your web.config
alert(appSettingValue);
</script>
How can I use server-side script in an external js file to grab a reference to a dom element?
The following works as intended when used as inline-script, but is returning null when I move this to an external js file.
$("#<%= gridResults.ClientID %>");
You'll need to have an inline script block that creates a JavaScript variable. This block should be added before your external JavaScript file. Once you do this, you can reference that variable in your external JavaScript file.
<script type="text/javascript">
var grid = $("#<%= gridResults.ClientID %>");
</script>
<script type="text/javascript" src="path/to/my.js"></script>
If you but a unique class on the grid using the CssClass property, you should be able to access the grid without having to know what it's clientID is.
You can't put #<%= gridResults.ClientID %>, because the gridresults.ClientID is specific to that asp.net page.
You could do:
<stript src="yourfile" type="text/javascript"> <!--link to external js file-->
<script type="text/javascript">
var grid = $("#<%= gridResults.ClientID %>");
yourfunction (grid);
</script>
What you want to happen cannot. The external javascript file is not parsed by the ASP.NET page's code behind, so the functionality of ASP.NET is not available to it.
I can get simple examples to work fine as long as there's no master page involved. All I want to do is click a button and have it say "hello world" with the javascript in a .js file, using a master page. Any help very much appreciated :)
EDIT
As #Adam points out in the comments, there is a native jQuery mechanism that basically does the same thing as the hack in my original answer. Using jQuery you can do
$('[id$=myButton]').click(function(){ alert('button clicked'); });
My hack was originally developed as a Prototype work around for ASP.NET and I adapted it for the original answer. Note that jQuery basically does the same thing under the hood. I recommend using the jQuery way, though, over implementing my hack.
Original answer left for comment context
When you use a master page, ASP.NET mangles the names of the controls on the dependent pages. You'll need to figure out a way to find the right control to add the handler to (assuming you're adding the handler with javascript).
I use this function to do that:
function asp$( id, tagName ) {
var idRegexp = new RegExp( id + '$', 'i' );
var tags = new Array();
if (tagName) {
tags = document.getElementsByTagName( tagName );
}
else {
tags = document.getElementsByName( id );
}
var control = null;
for (var i = 0; i < tags.length; ++i) {
var ctl = tags[i];
if (idRegexp.test(ctl.id)) {
control = ctl;
break;
}
}
if (control) {
return $(control.id);
}
else {
return null;
}
}
Then you can do something like:
jQuery(asp$('myButton','input')).click ( function() { alert('button clicked'); } );
where you have the following on your child page
<asp:Button ID="myButton" runat="server" Text="Click Me" />
If your site has content pages in other folders, using the Page's ResolveUrl method in the src path will ensure that your js file can always be found:
<script type="text/javascript" src='<%= ResolveUrl("~/Scripts/jquery-1.2.6.min.js") %>' ></script>
Make sure that jQuery is being added in the master page. Given that you have this control:
<asp:Button ID="myButton" runat="server" Text="Submit" />
You can wireup the javascript with this:
$(document).ready(function() {
$('[id$=myButton]').click(function() { alert('button clicked'); });
});
$(document).ready() fires when the DOM is fully loaded, and all the elements should be there. You can simplify this further with
$(function() {});
The selector syntax $('[id$=myButton]') searches elements based on their id attribute, but matches only the end of the string. Conversely, '[id^=myButton]' would match the beginning, but for the purposes of filtering out the UniqueID that wouldn't be very useful. There are many many more useful selectors you can use with jQuery. Learn them all, and a lot of your work will be done for you.
The problem is that ASP.Net creates a unique id and name attribute for each element, which makes finding them difficult. It used to be that you'd need to pass the UniqueID property to the javascript from the server, but jQuery makes that unneccessary.
With the power of jQuery's selectors, you can decouple the javascript from the server-side altogether, and wireup events directly in your javascript code. You shouldn't have to add javascript into the markup anymore, which helps readability and makes refactoring much easier.
Just move the <script type="text/javascript" src="jquery.js" /> tag into the head tag in the master page. Then you can use jquery in all content pages.
There is no magic about using master pages with jQuery.
Adam's solution is the best. Simple!
Master page:
<head runat="server">
<title></title>
<link href="~/Styles/Site.css" rel="stylesheet" type="text/css" />
<script src="Scripts/jquery-1.3.2.js" type="text/javascript"></script>
<asp:ContentPlaceHolder ID="HeadContent" runat="server">
</asp:ContentPlaceHolder>
</head>
Content page:
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
<script type="text/javascript">
$(document).ready(function () {
$("[id$=AlertButton]").click(function () {
alert("Welcome jQuery !");
});
});
</script>
</asp:Content>
where the button is
<asp:Button ID="AlertButton" runat="server" Text="Button" />
Reference the the Jquery .js file in the head of the MasterPage as follows:
<script type="text/javascript" src="/Scripts/jquery-1.2.6.min.js"></script>
(some browsers don't like ending it with />)
Then you can write things like
$('#<%= myBtn.ClientID%>').show()
in your javascript making sure to use the ClientId when referencing an ASP.Net control in your client code. That will handle any "mangling" of names and ids of the controls.
Master page:
The jQuery library goes in the master page. See if the path is correctly referenced. You might like to add the extra documentation like this:
<head>
<script type="text/javascript" src="/Scripts/jquery-1.2.6.min.js"></script>
<% if (false) { %>
<script type="text/javascript" src="/Scripts/jquery-1.2.6-vsdoc.js"></script>
<% } %>
</head>
Master page:
<head>
<script type="text/javascript">
$(document).ready(
function()
{
alert('Hello!');
}
);
</script>
</head>
CodeBehind for content pages and user controls:
this.textBox.Attributes.Add("onChange",
String.Format("passElementReferenceToJavascript({0})", this.textBox.ClientID));
Check out this post:
http://blogs.msdn.com/webdevtools/archive/2008/10/28/rich-intellisense-for-jquery.aspx
also explains how to get intellisense for jQuery in Visual studio.
When pages are rendered along with master pages, control id gets changed on page rendering so we can't refer them in jQuery like this #controlid. Instead we should try using input[id$=controlid]. If control is rendered as input control or if as anchor tag use a[id$=controlid] in jQuery.
In case if some one wants to access a label, here is the syntax
$('[id$=lbl]').text('Hello');
where lbl is the label id and the text to display in the label is 'Hello'
I also started with the simplest of examples and had no luck. I finally had to add the jquery .js file outside of the <head> section of the master page. It was the only way I could get anything to work in Firefox (haven't tried other browsers just yet).
I also had to reference the .js file with an absolute address. Not entirely sure what's up with that one.
Adam Lassek linked to using jQuery selectors, though I think its worth explicitly calling out selecting elements by their class, as opposed to their id.
e.g. Instead of $("#myButton").click(function() { alert('button clicked'); });
instead use $(".myButtonCssClass").click(function() { alert('button clicked'); });
and add the class to the button:
<asp:Button ID="myButton" runat="server" Text="Submit" CssClass="myButtonCssClass" />
This has the benefit of not having to worry about whether two control ids 'end' the same way in addition to being able to apply the same jQuery code to multiple controls at a time (with the same css class).
PROBLEM --> when using Site.Master pages the control id names (for ASP controls) get the ContentPlaceHolderID prefixed to them.
(Note this not a problem for non-asp controls as they don't get 'reinterpreted' - i.e. they just appear as written)
SOLUTIONS:
Simplest --> add ClientIDMode="Static" to the asp control definition (or set with properties) in aspx page
Alternatives include:
Hardcoding the ContentPlaceHolderID name in the js code e.g "#ContentPlaceHolder1_controlName" - eek!!!!
using the <%= controlName.ClientID %> in the ASP page - plus, assigning it - there- to a variable (or object of variables). The variable (or object dot notation) can then be used in external js page
(NOTE: Can't use <%= controlName.ClientID %> in external js)
Using CssClass with a unique(same name as ID) in ASP page and refering to the control as ".controlName" instead of "#controlName"
Using the "[id$=_controlName]" instead of "#controlName" - this is involves a small search and is looking for a control that ends with the unique name - that way the start is irrelevant