I need to generate a composite page made up of other pages in our system.
Is it possible for me to dynamically add iFrames to a page, each with its own src pointing to different URLs which are determined on the fly? If so, is there a preferred method to this?
Otherwise I need to refactor the other pages into user controls so I can add them as needed.
Although I'd seriously consider revising your pages to usercontrols if you'd like the "pages" to interact with each other. But for the question itself: you could add LiteralControls to your page (containing the iFrames) or to a placeholder.
PlaceHolder1.Controls.Add(new LiteralControl("<iframe src='mypage.aspx'></iframe>"));
You can do this the same way you dynamically add any .net control to a page, but you need to add an HtmlGenericControl
You could use the Document Object Model (DOM) / Javascript [1,2] to add iframes to your page. If you'd better like c# you'll have to postback before modifying the document I think (I'm not an expert in c# / asp).
[1] http://www.howtocreate.co.uk/tutorials/javascript/dombasics
[2] http://www.w3schools.com/jsref/default.asp
Related
What I have is few dropDownLists in few different templates of FormView.
And of course I can't get access to any of those.
What I want to do is get the same behavior for every DropdownList.
Is there any way to declare that DropDownList globally and reuse it or it should be done somehow with FindControl?
User control declarative syntax is very similar to syntax used to create an ASP.NET Web page.
The primary differences are that the user controls use an # Control directive in place of an # Page directive, and that the user controls do not include the html, body, and form elements around the content.
MSDN/creating usercontrol
I have an requirement where i have to display some content on iframe dynamically. Let me explain my scenario. I have a form where i have to display some html text. Earlier what i did is , i placed a literal on the form and fill it with HTML text. All worked fine but , the text alignments of the displayed html gets overriden by the page css.
So what i want now is that, instead of literal, i place an iframe. Now at page load event , i will generate a aspx dynamically and place a literal control and fill that literal control with the html text. And then will display that aspx page in the iframe.
So i would like to know the following things:
Is this a good idea to hold heavy
text , more than 20K of chars in
memory, dynamically generate aspx
page at runtime.
If any workaround to not to inherit
the page css inside the literal
displayed.
Any other approach better than my approach.
Way to implement my approach(iframe and dynamic aspx).
--- I am using ASP.NET / C# 4.0
Loads of questions...
Thanks in advance
AmRan, if this actually is a css problem, I would first try to create separate css styles for that content and use with the first solution you did. For example, wrap your dynamic content widh
<div id="dynamicContent">
tag and place
#dynamic {}
style settings inside your css file.
I don't think the Literal control has a CssClass property so you would have to use Label instead, or some other technique.
I would try to stay away from IFrame solutions if possible.
Hope this helps.
What would be the best approach to set dynamic content from the database to controls in an aspx page?
My database consists of pages (index.aspx, home.aspx and so on) which consists of controls (DivStart, LabelDescription, and so forth).
The first technique that came to my mind was looping through all the controls in the page, looking for controls that have a certain class, e.g. "Cms_DivStart", and would then set the inner html for that control from the database control called "DivStart". The problem is only runat server controls shows up, and I don't want to make all controls server side.
I could store all the dynamic texts for a page in hidden variables and set it with jQuery when the page has loaded, but that would make the text not show up directly..
Any other ideas would be greatly appreciated.
Thanks
/Andreas
You could use asp:PlaceHolder tags, these don't add any html unless they are utilised.
You can write a custom class, I'll call it "CustomPage", that inherits the System.Web.UI.Page class. Then your pages can inherit "CustomPage". In this class, add methods to retrieve data, set custom properties and display your content in the available controls.
I'll explain what I'm trying to achieve:
I want to have a situation where I can create as many controls as I want by creating them in a loop in the code behind. I can do this while using PHP, by mixing the PHP code and the HTML code. This allows me to generate actual HTML tags dynamically.
In ASP.NET, I haven't found a way to replicate this functionality.
I've thought about using a loop in the code behind on something like the Init() function to create an array of new() objects, setting their attributes and hoping it is passed into the aspx file, but it didn't work.
How do I do this?
If you want to creat Dynamically ASP.Net Hyperlink control
You can simply do this:
HyperLink hyp = new HyperLink();
hyp.ID = "hypABD";
hyp.NavigateUrl = "";
Page.Controls.Add(hyp);
Well, keep in mind there's a difference between Hyperlinks and LinkButtons in ASP.Net
If you just want Hyperlinks, you can create as many as you want by creating a HyperLink object, creating new objects and then adding them to some control's Controls collection like panel or span or something.
LinkButtons are a little different. You have to use a Repeater control if you want to create a link that posts back to the server. (Well, you don't have to but the alternative is a hack job.)
Hyperlinks can be created by using a Repeater control as well and, if possible is the method I would recommend.
There are lots of ways to do this in asp.net:
If you really wanted to, you could put a loop using <% %> tags directly into the aspx markup, just like with php or classic asp. This is not recommended.
You can put a placeholder or panel control on your form, create as many hyperlink controls or anchor tags as you want in your code behind and add them to the placeholder's controls collection. This is a little better, but still not optimal.
You can put a reasonable number of hyperlink controls on the page, set their visible property to false by default, and "enable" the ones you need. This is preferred to #2 because of some oddities with asp.net page lifecycle.
These links come from somewhere, and that somewhere is usually a database or other reasonable datasource. So make it data driven — bind that datasource to a control like a repeater, gridview, details view, or similar. This is probably your best option.
If you want to generate controls dynamically & don't need to have those PostBack to the server (i.e. when a control is clicked/changed, it will come back to the same page) - you could use controls in System.Web.UI.HtmlControls namespace.
e.g.HtmlAnchor link = new HtmlAnchor();
link.href = "www.stackoverflow.com";
Page.Controls.Add(link);
Hope this gives you enough background.
EDIT: You can use the above code in a loop & replace the fixed value with what comes from a database/object.
I would like to move items from one list to another on a page, and I'm pretty flexible about what type of a list it is. What's the best way to do that? ASP.NET Ajax? jQuery? Anything else?
There's a nice tutorial on CodeProject that covers dragging with ASP.NET and jQuery:
http://www.codeproject.com/KB/webforms/JQueryPersistantDragDrop.aspx
if you want to do this and PostBack instead of using AJAX to update your data based on from fields you'll need to get creative about what types of controls you use. Page validation will complain about ASP controls like dropdownlists, listboxes, etc. if they contain selected items that weren't in the list when it was rendered.
Better to use AJAX to send back your updates or use HTML controls like unordered lists or select added via javascript and stuff the selected data in another control that doesn't complain (hiddenfield) on PostBack. The alternative is turning off page validation and I don't think that's a good idea.
You can also might look at YUI Library, I'd say it implements Drag & Drop in a very simple and flexible way:
http://yuilibrary.com/yui/docs/dd/
There are a lot of examples etc...