Json, Jquery, $. ajax(), asp. Json, Jquery, $. ajax(), asp. I got a request from my client that before creating user they want to see the list of existing users with the like first name and last name. I didn’t want to use asp. I used Jquery $ajax which is excellent. Since my last AJAX project I've increasingly been wondering about the 'ideal' output format for the AJAX response. Once you've succesfully fired an AJAX request, what. Load a JSON string into a data structure. Also create a new data structure and serialize it into JSON. Use objects and arrays (as appropriate for your language) and. Simple example of using JavaScript Serializer in webmethod and consuming in client side using jquery; Author: Nandakishore G N; Updated. Convert DataTable to JSON using StringBuilder. Convert DataTable to JSON using JavaScriptSerializer. Convert DataTable to JSON using JSON.Net DLL. This may look sensible enough on the surface. After all, the json variable does end up containing a nicely serialized JSON string, which seems to be what we want. As the context above shows, the value of a term definition can either be a simple string, mapping the term to an IRI, or a JSON object. # Method 1: Convert DataTable to JSON using StringBuilder. Look: This is how JSON sample data looks {“firstName”: “Satinder”, “lastName”: “Singh”}. So I've got this html form: <html> <head><title>test</title></head> <body> <form action='myurl' method='POST' name='myForm'>. I planned to use Jquery ajax, as we know to use Jquery we need to get our results in Json format. Then we need to format json result using javascript to show the user friendly data to users. I started working through my solution. First shock I got. Java. Script. Serializer js = new Java. Script. Serializer(); js. Serialize(rows, sb); above method serializes the object passed to it to Json , you know what I passed as my object to this method, I passed my data table rows in it and it failed then I passed table in it and it failed so I started looking for the solution over the internet found quite few solutions but them were not fitting to my need one found in asp. I managed to resolve those erros . String. Builder] used in my method]. Div to show the result. Following is the result div in which I’ll be showing my final resutl on asp. Ajax"> < /div>. ID="btn. Add" runat="server" Text="Create new user" On. Click="btn. Add_Click" On. Client. Click="find. User. Before. Create()"> < /asp: button> This is the page method which takes first name an last name as input parameters passed and returns json result as string.[Web. Method]. publicstaticstring Find. Users. Ajax(string first. Name, string last. Name). String. Builder sb =new String. I've been thinking about replacing the JSON serializer in my internal codebase for some time and finally put a little effort into allowing JSON.NET from James Newton.Builder(). string str. Find =String. Format("First. Name like '{0}%' AND Last. Name like '{1}%' ", first. Name. Trim(), last. Name. Trim()). Data. Table dt = Get. Data. Set(). Tables[0]. List< dictionary < string, object> > rows =new List< /dictionary> < dictionary < string, object> > (). Select(), delegate(Data. Row row). Dictionary< string , object> Dictionary =new Dictionary< /string> < string , object> (). Data. Column col in dt. Columns). Dictionary. Add(col. Column. Name, row[col]. To. String()). rows. Add(Dictionary). Java. Script. Serializer js =new Java. Script. Serializer(). Serialize(rows, sb). To. String(). }< /string> < /dictionary> Following Java Script function which, I am calling on the click event of the button calls the c# method it first name and last name as input parameters which then are passed to c# method. User. Before. Create(){. Name = $("#< %=txt. Last. Name. Client. ID%> "). val(). Name = $("#< %=txt. First. Name. Client. ID%> "). val(). Name. length< =0 first. Name. length< =0){. Ajax"). html("Please enter names"). Ajax"). show('fast'). Find. Users. Ajax". Name: '"+ first. Name +"',last. Name: '"+ last. Name +"'}". Type: "application/json; charset=utf- 8". Ajax"). html("Nothing found"). Ajax"). show("fast"). Object = eval(response. Build. Table(my. Object); //$("#div. Ajax"). html(my. Object). Ajax"). show("fast"); }}. Text); }}); }}Following C# code willl generate dummy data for you. Data. Set Get. Data. Set(). Data. Set ds =new Data. Set("my. Data. Set"). Data. Table t =new Data. Table("Table. Name"). Data. Column c =new Data. Column("User. ID"). Data. Column c. 2 =new Data. Column("Password"). Data. Column c. 3 =new Data. Column("First. Name"). Data. Column c. 4 =new Data. Column("Last. Name"). Columns. Add(c); t. Columns. Add(c. 2). Columns. Add(c. 3); t. Columns. Add(c. 4). Tables. Add(t). for(int Index =1; Index < =1. Index++). Data. Row r = t. New. Row(). r[0]= Index. To. String(). r[1]="password"+ r[0]. First. Name"+ r[0]. Last. Name"+ r[0]. Struggle point: I was returning Results in Json but Java. Script eval function was not working for me and it took few hours to resolve the issue thanks to. Object = eval(response. ORvar my. Object= eval("("+ eval( response)+")"); I was using it like var my. Object= eval(“(“+ response + “)”); and struggled as it was treating result as single string not as an array, then using it in this way It worked for me var my. ASP. NET web services mistake: manual JSON serialization. If you’ve spent much time working with the . NET platform, ASP. NET’s simple, convention- based approach to exposing JSON endpoints seems just about too good to be true. After years of fiddling with manual settings in XML configuration files, it’s understandable to assume that working with JSON in ASP. NET would require a similar rigmarole, yet it does not. Unfortunately, this unexpected ease- of- use isn’t obvious if you don’t already know about it, which has led some developers to build needlessly complicated solutions to problems that don’t actually exist. In this post, I want to point out a few ways not to approach JSON in ASP. NET and then show you a couple examples of leveraging the frame work to do it “right”. A couple examples of what NOT to do. To show you exactly what I’m talking about, let’s start by looking at a few concrete examples of ways that you should not handle sending and receiving JSON in your ASP. NET services. For all the examples, we’re going to be trying to send and/or receive instances of this Person class. Person. public string First. Name { get; set; }. Last. Name { get; set; }. Person{ publicstring. First. Name{get; set; } publicstring. Last. Name{get; set; }}Once you progress beyond simple scalar types, sending objects (and collections of them) back and forth is a pretty logical next step, and that’s also the point where this manual serialization trouble seems to begin. So, working with this simple Person class should serve as a realistic example, without being overly complex. Manual serialization, using Java. Script. Serializer. The most common variant of this mistake that I’ve seen is using Java. Script. Serializer to manually build a JSON string and then returning that string as the result of a service method. For example, if you didn’t know better, you might do this to return an instance of the Person class. Script. Service]. Person. Service : Web. Service. public string Get. Dave(). Person dave = new Person(). First. Name = Dave. Last. Name = Ward. Java. Script. Serializer jss = new Java. Script. Serializer(). Results in {"First. Name": "Dave","Last. Name": "Ward"}. string json = jss. Serialize< Person> (dave). Script. Service]publicclass. Person. Service: Web. Service{ [Web. Method] publicstring. Get. Dave() { Person dave=new. Person(); dave. First. Name=Dave; dave. Last. Name=Ward; Java. Script. Serializer jss=new. Java. Script. Serializer(); // Results in {"First. Name": "Dave","Last. Name": "Ward"} stringjson=jss. Serialize< Person> (dave); returnjson; }}This may look sensible enough on the surface. After all, the json variable does end up containing a nicely serialized JSON string, which seems to be what we want. However, you should not do this. What actually happens. Part of the beauty of using ASP. NET’s JSON- enabled services is that you rarely have to think much about the translation between JSON on the client- side and . NET objects on the server- side. When requested with the proper incantations, ASP. NET automatically JSON serializes your service methods’ responses, even if their result is an object or collection of objects. Unfortunately, that automatic translation also makes it easy to end up with doubly- serialized responses if you aren’t aware that ASP. NET is already handling the serialization for you, which is exactly what would happen in the preceding example. The end result is that the Person object is serialized twice before it gets back to the browser – once as part of the method’s imperative code and then a second time by convention. In other words, it’s understandable to expect the previous code example would return this response. First. Name": "Dave","Last. Name": "Ward"}1{"First. Name": "Dave","Last. Name": "Ward"}But, what it actually returns is this. All the quotes in the manually generated JSON must be escaped in. First. Name": "Dave","Last.
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