AJAX :: Using XMLHttpRequest To Get Data From Database?
Mar 23, 2010
I want to use Ajax XMLHttpRequest and get data from a database table and show it on the screen. I followed the link "Guide to Using AJAX and XMLHttpRequest from WebPasties" http://www.webpasties.com/xmlHttpRequest/index.html but there the code some part is written in PHP. I want entire steps and code in asp.net etc. Can you please give me a link where exactly I create XMLHttpRequest and get data from database. To achieve the above requirement do I need to AjaxFy my asp.net webapplication by adding configuration in the web.config file.
the idea id I need to send data to the client to the server to inform the server of some events at the client, and i need to send data from server to the client to inform the client of some results on the server. now from client to server is easy I use xhr easy enough. and to send data from server to client I thought of using long polling in xhr so to test I wrote the following code:
I am relatively new with the usage of asp.net and AJAX technologies and i am trying to add some ajax functionality to my web application.So, I was interested in finding out what the advantage is of using asp.net ajax libary and controls over the usage of simple javascript XMLHttpRequest.
i want redirect ALL ajax requests(with X-Requested-With:XMLHttpRequest in header) to action: ajax(string function, string args) . How can i do it?For example: browser send ajax query with paramerts function=getImage&args=4 to url http://localhost/post/123 but we redirect query to http://localhost/ajax.
On "submitForms" click the fucntion "submitTest" is invoked. From jQuery documantation "submitHandler" would be called if form is VALID. So, the validation works and "submitHandler" is NOT invoked if form is INVALID. BUT, the XmlHttpRequest is sent anyway, though "submitHandler" isn't invoked.
I have many AJAX forms on the page and on button click I need to submit them all. Regular **forms.each(function (index, form) { $(form).submit();} won't work for me because in this way ONLY the last form will be submitted eventually. Therefore, I need submit them via $.ajax(...). But I want to enable submit ONLY and ONLY if form is VALID On "submitForms" click the fucntion "submitTest" is invoked. From jQuery documantation "submitHandler" would be called if form is VALID. So, the validation works and "submitHandler" is NOT invoked if form is INVALID. BUT, the XmlHttpRequest is sent anyway, though "submitHandler" isn't invoked.
<% using (Ajax.BeginForm("FormPost", "Customer", null, new AjaxOptions() { HttpMethod = "POST" }, new { @class = "form-container" })) { %> <%: Html.TextAreaFor(m => m.Name, new { width = 440, height = 100 })%> <input type="button" value="submitForms" /> <% }%> <script type="text/javascript"> function submitTest(){ var forms = $(".form-container"); forms.each(function (index, form) { $(form).validate({ submitHandler: function (form) { $.ajax( { .... }); } }); }); forms.each(function (index, form) { $(form).submit(); }); } </script>
$.ajax({ url: "path/to/webservice.asmx" beforeSend: function(xmlHTTPRequest) { //modify headers here //remove cookies } success: function() { //do stuff } }
What I would like to do in the beforeSend function is take the incoming xmlHTTPRequest variable that is set and modify the headers to remove the cookie object that is in there, so in the call to my web service, it does not renew forms authentication in asp.net
I have what should be a relatively simple task that's frankly got me stumped. I've researched it until my brain is fried, and now I'm puntingHere's the scenario:I have an ASPX page (Q2.aspx) that is decorated with the WebService,WebServiceBinding, and ScriptService attributes. That page contains a method, GetAllContacts, that is decorated with the WebMethodattribute and returns a string containing JSON data. (For what it's worth, the pageitself contains no other controls or functionality.)I have an HTML page that contains JavaScript which uses the XmlHttpRequestobject to invoke the GetAllContacts WebMethod on the ASPX page and transformthe JSON data into an HTML table. I have verified that my Web.Config file contains the appropriate protocol handlersfor HttpGet and HttpPut in the WebServices section under System.Web.webServices. I have verified that my Web.Config file contains the ScriptModule entry under theSystem.webServer.modules section, and that it matches the appropriate documentation.
However, when I view the HTML page in a browser, the following occur:The web request goes through, but the results are for the unprocessed HTML from the ASPX page.The GetAllContacts method is never invoked, as evidenced by setting a breakpoint in its code.The code to invoke the Web service, however, is invoked, and the JavaScript callbackfunction that is invoked upon request completion is properly invoked.
It appears that the JavaScript code is largely set up correctly, but for some reason that is completely escaping me at this point, the HTML page will simply not execute the WebMethod on the ASPX page, and simply returns the page as though it were a plain HTML GET request. Clearly, an HTML document can't be evaluated by JavaScript's eval function, which brings me to my problem. (Also note that the JSON data appears nowhere in the HTML that's returned.)I am, frankly, baffled. I've looked at dozens of Microsoft articles, StackOverflow posts, CodeProject articles, and who knows what else. My code looks like it's okay. But I know better. I'm missing something simple, stupid, and obvious. I just need someone to point it out to me.Below you'll find the ASPX page code and the HTML code, in the hope that they'll shed some light.ASPX Code
I'm building a web app for my company that will run a query every few seconds against SQL Server, and the data that it returns is which database is restoring and how much % complete it is. I have the query already set up and it works fine.
What I want to do is on my Web Form, have a "div" element that will contain the % complete of a database restore, and have it update every few seconds using the JavaScript timer object:
setInterval(function, interval)
I figure I would need to use XMLHttpRequest to send the request to the web server which will run the SQL query. Am I on the right track? How would I even start to do this?
My SQL query is below:
Use master Select der.session_id, der.command, der.status, der.percent_complete, * From sys.dm_exec_requests as der Where percent_complete > 0
I am trying to send JSON from my mozilla addon to my asp.net page.
var myJSONObject = {"userName": una,"password": pass}; request = new XMLHttpRequest(); request.open("GET","http://www.google.com?jo=" + myJSONObject,true, null, null);
on my .net page I have tried several ways of doing it but not able to find the best way to serialize and deserialize the code. All I need is to send the json data back n forth and parse it on C# n javascript.
I have tried DataContractJsonSerializer, JavaScriptSerilizer among many other things. But not able to make any of it work. With the JavaScriptSerilizer, It does deserilize it if it takes an argument from the browser for e.g. If I open up the browser and paste something like [URL]} it does deserilize and return me individual values, but it does work when I do an XMLHTTPRequest (as above) from my mozilla addon.
I need to upload and save an image onto the server. I am using an XMLHttpRequest POST to send the image to the server and calling a class named imageSave.aspx.I am finding difficulty in "catching" the image from server side (imageSave.aspx) and saving it onto the server. Does anyone please have some tips as to how this is done or maybe link to a good article or something?
I am new to AJAX. I am designing a feedback form for a video conferencing session in asp.net web application which will be displayed as a modal window. The questions on the modal window will be displayed from a table stored on SQL Server 2008 and the responses of those questions should again be stored back in a different table on SQL Server after user clicks on the SUBMIT button on the modal window (and also, the window should close after the action).
I am not aware of the way to retrieve data from or store data to SQL server from modal window though I know how to retrieve and store data using asp.net and c#...
I have two repeaters where i'am moving rows from one to another by jquery drag and drop.
My question is, I want to achieve the first and second columns (they are the parameters) of each repeater (table) so that could call a webservice to make the update on database. So, how I achieve this and how can i call a webservice passing to the method the parameters for each change on both tables.
I want to add gridview row data into to data base I am doing it perfectly.My problem is that want all gridview row data save and then web method should be called but in my cause one gridview data save in array then call webmethod,then other row data save in array then call webmethod called this process should be so on.But I want it webmethod should be called when all gridview row save in array.
Follwing code
Jquery <script type="text/javascript"> $(function () { $("[id*=btnSubmit]").bind("click", function () { var Customer = {};
I am new to ASP.NET. So now I am working on Adding data into the sqlserver database by using jquery. The form are pop up by click on the button Add of the page. I also use the LIST VIEW to display those data from the database.
