Sometimes, you use JQuery within your Asp.Net projects to provide richer and more interactive web experience. The user now can drag and drop, admire your smooth animations, interact in many ways with the page and experience a whole bunch of other funny things. On top of that, you could appreciate how integrating JQuery with ASP.NET projects is pretty straightforward.
>> Could we now save it all to our database thanks to a little Asp.Net method ? which means formatting the data, sending it to the server which will eventually treat it. So how to send back data to the server ?
>>How to call a server method without the postback mechanism but just with pure raw HTML controls never bound to the server ?
Of course, a simple Ajax call will do the trick !
We’ll see how to :
- build this simple Ajax call to the asp.net server
- how to format basic data with JSON
Let’s say you want to enable the user to create his own forms with the fields and the questions of his choice. The user should just choose the fields from a list and those fields should be sortable, draggable, deletable so that he can move them, change their order by simply dragging and dropping objects.
Well, see google documents, add new form, something like this, no ? well I can show you the basics with jquery to build dynamic forms.
To sum up, we want a sortable dynamic list of fields. First of all, you need to inject html in the webpage areas you define. Then we will enable sorting and dropping and throwing away.
First, here’s the list from which the user chooses the fields :
<select id="fieldtoadd" style="float:left">
<option value="">add new field...</option>
<option value="textarea">multiple line text</option>
<option value="radiobutton">multiple choice</option>
<option value="uploadfile">upload a file</option>
here’s the <div> element where to inject the fields :
<div id="fieldslist" style="float:left"></div>
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In this article, we’ll see how to make full page postback controls work in an update panel.
We will then raise the problem of a button field in a gridview cell in an update panel that requires full page postback registration and suggest a workaround.
How basically the update panel works ?
The asp update panel is a native control which performs an asynchronous postback to render selected parts of the webpage. If you already know ajax mechanisms, update panel shouldn’t be mysterious for you. It deals indeed with Ajax and partial-page update to allow richer and more ergonomic web application.
Why my upload or download file function won’t work within an update panel ?
All of the controls placed inside the update panel are converted into partial postback controls. That’s pretty coherent because we want the page to be fast and user-friendly so the nested controls won’t raise a full reload of the page. But those controls will go on working as long as they don’t need full postback.
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