AJAX :: Pass Some More Parameters In WebMethod While Using Cascading DropDown Extender?
Jul 28, 2010
I am using AJAX Cascading dropdown extender,and i have made a running dummy example.Using web service second dropdown is filled based on the selection of first drop down. But actual query that should fill second drop down have some more constraints in 'where' clause of the sql query, and that's value is too dynamic that (i cannot assume its value to be static). So i need that that variable's value in my web method too.
Using cascading dropdown extender we have to define web method. In that web method does the parameters that we declare should match names like "knownCategoryValues","category" etc ? Suppose if we write "knownCategoryValues1" insteed of "knownCategoryValues" then why my webmethod is not called ?
And if i give "knownCategoryValues" then it is called ?For the First time i have seen parameters name matters in Method parameters list. But why in this case different naming causes problem ?
I am using the newest AJAX control toolkit. What I want to accomplish is I have a modal popup panel with cascading dropdown list and radio button inside. The issue is the postback. RadioButton and Cascading dropdown have postback so that will cause the modal panel disappear after the postback. I just want the panel disappear after I click the ok button on the panel and send the data into a field in a page. What I did was I placed the update panel inside the popup panel. If I did that, I would see the dropdown lists automatically refresh every time by accessing the webservice. If I placed the update panel outside, the dropdown would not be triggered. Even I set the trigger for the Update Panel, it will not see that way.
district region city Id can 1 Canada 1 Lon 1 London 2 Ita 2 Canada 3
Now when I select city from DDlcity after that select region from DDlregion according to my selected item from DDlcity and DDlregion it bind DDlDistrict... before I used OnselectedIndexChange below is SP...
ALTER procedure [dbo].[SelectِDistrict] @Region NVARCHAR(30), @city NVARCHAR(40)
[Code] ....
It worked correctly but now I use cascadingdropdown list
[WebMethod] public CascadingDropDownNameValue[] GetDistrict(string knownCategoryValues) { string region = CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues)["Region"]; string query = string.Format("SELECT District FROM District WHERE Region = N'{0}'", region);
[Code] ....
problem is that when I select city=canada then region=1 I want it bind in DDldistrict =can but here it show in DDLdistrict can and Lon
here it just select district that region=1 it doesn't attention to city selected Item I want it do like SP that I used...
I'm trying to pass a static value (from a list box) into an Autocomplete Extender. I've had Autocomplete working with just the prefixText but can not get it to work when passing an extra parameter through the contextKey.Please see below:On Page Load:
Basically, my question is: how do I specify optional parameters to a WebMethod when providing JSON data?
I know I can reduce the parameters down to just the required values, and then use HttpContext.Request.Params to read the values of optional paramaters, but I would have thought the way I have tried here should have worked.
EDIT
The XMLHttpRequest.responseText value for the error is:
Invalid JSON primitive: staffcode.
This is throwing me even more off the scent of the problem :(
I'm doing an jQuery AJAX POST call to a webmethod, which is working fine. If I'm passing data from the AJAX call, I normally get the data in the webmethod via webmethod parameters.
JavaScript Code: $.ajax({"dataType": "json","contentType": "application/json","type": "POST","url": "Default.aspx/GetStuff","data": JSON.stringify({"a":"data1","b":2}),"success": function (msg) { console.log(msg.d);}}); C# Code: [WebMethod]public static object GetStuff(string a, int b){ }
Is there any way I can get the data as a Dictionary or some other object, instead of having to put in individual parameters to the GetStuff() web method for each data param? It's a POST request so nothing is in Request.QueryString, and Request.Params/Request.Form doesn't contain it either.
I tried cascading dropdown in asp.net using ajax. I have tried with 3 dropdown control. The scenario is First dropdown is loaded when page gets loaded and the second dropdown is loaded based on first is selected and thrid dropdown is loaded based on second one selected, now I want to know how do I load third dropdown based on first and second selected value...
I am developing a user control. This user control is having 2 Dropdown controls and one textbox('txtCustomer'). I am using autocompleteextender for the text box. This 'txtCustomer' control populates the data based on the value selected in 2 dropdowns.
I need to pass the selected value of this 2 dropdown to my meb method. I am not using web service(.asmx page) for this application instead i am using page level web method. I tried to access the controls from the web method inside the Page. but all the identifiers and controls of the page returning null in the web mothod. I have analysed it is because the events "page_Load and page_Init" are not getting fired.
and this aspx page [Code].... perhaps i followed this example here http://programming.top54u.com/post/AJAX-Cascading-Dropdown-Example-using-SQL-Database.aspx
it return an error that System.InvalidCastException: unable to cast di object of 'AjaxControlToolkit.CascadingDropDown' on tye 'System.Web.UI.WebControls.DropDownList'.
Suppose parent dropdown is car (Values are car1, car2, car3)and its child is color(for car1 R Y G B, For car2 R Yand for car3 G B).Now on selection of car2 R and Y will appear and select R, then again made the change on car and select car3 then again select is comiing with G and B and select B.
Now if I select again in car, car1 then the child is populating with the values of car1 but it takes the B as a default value as it was previously selected and also present for car1 too.This case is only happen. on select of child value which is availble for both parent selection.
I have a cascading dropdown which is dynamically created and does a postback based on a certain condition. How do i set the selected value after the postback
I am using Cascading Dropdown nad would be populating the values of the second dropdown from the session thats created when the page load.With the initial page load, the cascading dropdown works fine. But when I change the selection for the first one, the session values are not retained.
I have been trying to make a cascading drpdown using ajax using this link [URL] But m nt getting a clear picture abt it.. I have a table 'car' with fields of 'id','make','model','color'. I have 2 dropdowns on my form for make & model.I want to populate the model dropdown using the make dropdown but without postback.Till nw I have tried this :-
using System; using System.Web; using System.Collections; using System.Collections.Generic; using System.Collections.Specialized; using System.Web.Services; using System.Web.Services.Protocols; using AjaxControlToolkit; using System.Data; using System.Data.SqlClient; using System.Configuration; //using System.Web.Script.Services.ScriptService;.............................
I have a user control in which i have implemented Cascading dropdown. It works perfectly fine in IE but doesnt in Firefox. I am using webservice to get my data for the dropdowns.
I am binding the dropdownlist by using ajax cascading drop down now i need to preselect the dropdown value in code behind page in page load (for update operation) is it possible
I wan to do a required field validation for the cascading dropdownlist . When my page first load out the validator is fired first in the google chrome, the callout extender message is prompt out first in the Google Chrome. I have tested the code in IE and safari, this two browsers never prompt out the validator callout first when the page is loaded.
i wonder why the google chrome will prompt out the validator when i validate the cascading dropdownlist. I have did some research on it, but failed to get any solution.
I am new to Ajax Control Toolkit, with the help of online tutorials I had created a cascading dropdown list in asp.net and tested it on my local machine. For this dropdown list data source would be an xml file (which is saved on my local machine c drive). I haven't encountered any issues until I deploy the precompiled web site on to IIS 7. When I open the web site from IIS I would see the two dropdown boxes on the web page with an error "Method error 500". I believe this error occured due to incorrect xml file path provided on IIS. I had copied xml and xsd files into IIS server C drive but it did not help out and then I created a network map and placed the xml and xsd files in that shared folder tried to access that path from web service, it's working on local machine but not on IIS. It would be great, if any one could explain me the solution.
I have 3 dropdown lists. All 3 are using the same generic list for there items. I am using C# as the code behind. The code below shows the DTO list i am using and how I'm adding them to the drop downs...
