Develop Reference

How to bind dataset values into text box in asp.net

i have aspx webform that contains search box and button like this
In code behind NT search method called using web method like this
[WebMethod]
public static void GetNT(string NTID)
{
try
{
myService.myServiceClient me = new myService.myServiceClient();
DataSet dsResult = me.InfobyNt(NTID);
ware1 _ware1 = new ware1();
_ware1.AssignValues(dsResult);
}
catch (Exception ex)
{
ex.ToString();
}
}
i had result on dataset and passed to assignvalues method, there i bind values like this
protected void AssignValues(DataSet dsResult1)
{
try
{
if (dsResult1 != null && dsResult1.Tables[0].Columns.Count > 1)
{
Response.Write(dsResult1.Tables[0].Rows[0]["EMPNAME"].ToString());
// foreach(var datas in dsResult.Tables[0].Rows)
//{
string name = dsResult1.Tables[0].Rows[0]["EMPNAME"].ToString();
txtFname.Text = name.ToString();
txtEmilSgs.Text = Convert.ToString(dsResult1.Tables[0].Rows[0]["EMAILID"]);
txtPrgSgs.Text = Convert.ToString(dsResult1.Tables[0].Rows[0]["PROGNAME"]);
txtMname.Text = Convert.ToString(dsResult1.Tables[0].Rows[0]["MANAGERNAME"]);
//}
}
else
{
Response.Write("<script>alert('fail')</script>");
btnSgsLoad.Text = "Can't find NT ID";
}
}
catch (Exception ex)
{
ex.ToString();
}
}
while binding data from dataset an error thrown like this
can somebody help me how to bind dataset values into asp:textbox

dsResult1.Tables[0].Columns.Count > 1 replace this with dsResult1.Tables[0].Rows.Count > 1 because there is no reason to count columns of dataset table, probably your dataset is not null but tables in your dataset is null check if your dataset has tables and rows as per your expectation otherwise you will get the same error. and
string name = dsResult1.Tables[0].Rows[0]["EMPNAME"].ToString();
this line is getting null value to "name" string that's the reason behind this error.
Check you dataset is full fill with all records

Comparing Selected DropDown with condition

i am creating a form which can be accessed based on condition in MVC. I have first view with dropdownlist and submit button, i want when the submit button is clicked, the value in dropdownlist is passed and compared with condition set for that value, and if the condition is not ok, it shows alert rather than processing to the form.
Here is my code:
public ActionResult ChooseType()
{
var x = DataAccess.GetEmployee(#User.Identity.Name);
var lists = new SelectList(RuleAccess.GetAllRule(), "ID", "TypeDetail");
ViewBag.CategoryId = lists;
/*rule*/
ViewBag.comp1 = Logic.AnnualToogle(#User.Identity.Name);
if (x.EmpSex == "F" && x.EmpMaritalSt == "NIKAH")
{ ViewBag.comp2 = 1; }
else ViewBag.comp2 = 0;
return View();
}
[HttpGet]
public ActionResult Create(int lv_type)
{
var type = RuleAccess.GetTypeByID(lv_type);
ViewBag.type = type;
var model = new LeaveApplicationViewModels();
model.X = DataAccess.GetEmployee(#User.Identity.Name);
model.C = DataAccess.GetLeaveApp(#User.Identity.Name);
/*disable*/
ViewBag.dis = DataAccess.GetDisabledDate(#User.Identity.Name);
/*max*/
var max= RuleAccess.GetMaxByID(lv_type);
ViewBag.c = max;
if (lv_type == 1)
{
var used = RuleAccess.CountUsedAnnual(#User.Identity.Name);
var rem = max - used;
ViewBag.a = used;
ViewBag.b = rem;
}
else
{
ViewBag.b = max;
}
return View(model);
}
I used the Viewbag.comp 1 & 2 in my view:
<script type="text/javascript">
var x = #ViewBag.comp1;
var y = #ViewBag.comp2;
function validatecreate()
{
var value= document.getElementById("lv_type").value;
if (value==1)
{
if(x==1)
document.getElementById('validatecreate').submit();
else { alert('Action cant be done. You either have another annual leave application in pending status or you have reach the limit of annual leave'); }
}
else if(value==2)
{
if(y==1)
document.getElementById('validatecreate').submit();
else { alert('Action cant be done. You either are Male or Not Married Yet'); }
}
else if(value==3)
{
document.getElementById('validatecreate').submit();
}
else {
document.getElementById('validatecreate').submit();
//alert('Http Not Found');
}
}
#Html.DropDownList(
"lv_type", (SelectList) ViewBag.CategoryId,
"--Select One--",
new{ //anonymous type
#class = "form-control input-sm"
}
)
I feel like im doing it wrong especially because if someone manually put the url with ?lv_type=2, they not validate and can go to the form directly. But i need the value of lv_type bcs i use that in my view. Please Helpp :(

Validation must always be done on the server, and client side validation should only be considered a nice bonus that minimizes the need for to a call to the server. And presenting options in a dropdownlist to a user and then telling them thay can't select that option is an awful user experience. Instead, you should be presenting only those options which are applicable to the user (and delete all the scripts you have shown).
Create an additional method in your RuleAccess class, say GetEmployeeRules(Employee employee) which returns only the rules that are applicable to that employee, for example
public static List<Rule> GetEmployeeRules(Employee employee)
{
// Get the list of all rules
if (employee.EmpSex == "F" && employee.EmpMaritalSt == "NIKAH")
{
// Remove the appropriate Rule from the list
}
.....
// Return the filtered list
}
In addition, you should be using a view model in the view
public class LeaveTypeVM
{
[Required(ErrorMessage = "Please select a leave type")]
public int SelectedLeaveType { get; set; }
public IEnumerable<SelectListItem> LeaveTypeList { get; set; }
}
Then in the ChooseType() method
public ActionResult ChooseType()
{
var employee = DataAccess.GetEmployee(#User.Identity.Name);
var rules = RuleAccess.GetEmployeeRules(employee);
var model = new LeaveTypeVM()
{
LeaveTypeList = new SelectList(rules, "ID", "TypeDetail")
};
return View(model);
}
and in the view
#model LeaveTypeVM
#using (Html.BeginForm())
{
#Html.DropDownListFor(m => m.SelectedLeaveType, Model.LeaveTypeList, "--Select One--", new { #class = "form-control input-sm" }
#Html.ValidationMessageFor(m => m.SelectedLeaveType)
<input type="submit" value="Submit" />
}
and submit to a POST method which allows you to easily return the view if its invalid, or to redirect to the Create method.
[HttpPost]
public ActionResult ChooseType(LeaveTypeVM model)
{
if (!ModelState.IsValid)
{
model.LeaveTypeList = .... // as per GET method
}
return RedirectToAction("Create", new { leaveType = model.SelectedLeaveType });
and in the Create() method
public ActionResult Create(int leaveType)
{
var employee = DataAccess.GetEmployee(#User.Identity.Name);
var rule = RuleAccess.GetEmployeeRules(employee).Where(x => x.ID == leaveType).FirstOrDefault();
if (rule == null)
{
// Throw exception or redirect to an error page
}
var model = new LeaveApplicationViewModels();
....
return View(model);
}
Note your LeaveApplicationViewModels should contain additional properties so that you can avoid all those ViewBag properties and generate a strongly typed view.

How to create dependant dropndown/selection cell In GWT celltable 2.3?

I am using gwt2.3 celltable.
In my celltable there will be multiple column out of that few columns are dependent.
ex. Name and address columns are dependent
Name and address columns contains my custom selection cells.
In Name column : 1 cell contains jon,tom,steve
when Name cell contains jon then I want to set US & UK in address cell
if user changes Name cell to tom then I want to set india & china in address cell
if user changes Name cell to steve then I want to set japana & bhutan in address cell
I want to change dependent data from address cell when name cells selection changes.
How I can achieve this thing? Any sample code or pointers to do this?

This solution is for GWT 2.5, but it should probably work in 2.3.
I think the best is that you modify your RecordInfo element when you change the selection on the first column. You can do it similar to this in your CustomSelectionCell:
#Override
public void onBrowserEvent(Context context, Element parent, C value, NativeEvent event, ValueUpdater<C> valueUpdater) {
super.onBrowserEvent(context, parent, value, event, valueUpdater);
if (BrowserEvents.CHANGE.equals(event.getType())) {
Xxxxx newValue = getSelectedValueXxxxx();
valueUpdater.update(newValue);
}
}
Then where you use your cell add a fieldUpdater like this, that will update the RecordInfo with the new value and ask to redraw the row:
column.setFieldUpdater(new FieldUpdater<.....>() {
....
recordInfo.setXxxxx(newValue);
cellTable.redrawRow(index);
....
});
This will call the render of the other CustomSelectionCell, in there you will be able to check if the value of the RecordInfo has changed and update the seletion values as needed. Example:
#Override
public void render(Context context, C value, SafeHtmlBuilder sb) {
if (!value.getXxxxx().equals(this.lastValue)) {
this.items = loadItemsForValueXxxx(value.getXxxxx());
}
.... // Your usual render.
}
Be careful when you changed the items to set a default selected item too.

This is my implementation of DynamicSelectionCell.
DynamicSelectionCell allows you to render different options for different rows in the same GWT table.
Use a single DynamicSelectionCell object and use the addOption method to add options for each row. Options are stored in a Map with the Key being the row number.
For each row $i in the table the options stored in the Map for key $i are rendered.
Works on DataGrid, CellTable.
CODE
public class DynamicSelectionCell extends AbstractInputCell<String, String> {
public TreeMap<Integer, List<String>> optionsMap = new TreeMap<Integer, List<String>>();
interface Template extends SafeHtmlTemplates {
#Template("<option value=\"{0}\">{0}</option>")
SafeHtml deselected(String option);
#Template("<option value=\"{0}\" selected=\"selected\">{0}</option>")
SafeHtml selected(String option);
}
private static Template template;
private TreeMap<Integer, HashMap<String, Integer>> indexForOption = new TreeMap<Integer, HashMap<String, Integer>>();
/**
* Construct a new {#link SelectionCell} with the specified options.
*
* #param options the options in the cell
*/
public DynamicSelectionCell() {
super("change");
if (template == null) {
template = GWT.create(Template.class);
}
}
public void addOption(List<String> newOps, int key){
optionsMap.put(key, newOps);
HashMap<String, Integer> localIndexForOption = new HashMap<String, Integer>();
indexForOption.put(ind, localIndexForOption);
refreshIndexes();
}
public void removeOption(int index){
optionsMap.remove(index);
refreshIndexes();
}
private void refreshIndexes(){
int ind=0;
for (List<String> options : optionsMap.values()){
HashMap<String, Integer> localIndexForOption = new HashMap<String, Integer>();
indexForOption.put(ind, localIndexForOption);
int index = 0;
for (String option : options) {
localIndexForOption.put(option, index++);
}
ind++;
}
}
#Override
public void onBrowserEvent(Context context, Element parent, String value,
NativeEvent event, ValueUpdater<String> valueUpdater) {
super.onBrowserEvent(context, parent, value, event, valueUpdater);
String type = event.getType();
if ("change".equals(type)) {
Object key = context.getKey();
SelectElement select = parent.getFirstChild().cast();
String newValue = optionsMap.get(context.getIndex()).get(select.getSelectedIndex());
setViewData(key, newValue);
finishEditing(parent, newValue, key, valueUpdater);
if (valueUpdater != null) {
valueUpdater.update(newValue);
}
}
}
#Override
public void render(Context context, String value, SafeHtmlBuilder sb) {
// Get the view data.
Object key = context.getKey();
String viewData = getViewData(key);
if (viewData != null && viewData.equals(value)) {
clearViewData(key);
viewData = null;
}
int selectedIndex = getSelectedIndex(viewData == null ? value : viewData, context.getIndex());
sb.appendHtmlConstant("<select tabindex=\"-1\">");
int index = 0;
try{
for (String option : optionsMap.get(context.getIndex())) {
if (index++ == selectedIndex) {
sb.append(template.selected(option));
} else {
sb.append(template.deselected(option));
}
}
}catch(Exception e){
System.out.println("error");
}
sb.appendHtmlConstant("</select>");
}
private int getSelectedIndex(String value, int ind) {
Integer index = indexForOption.get(ind).get(value);
if (index == null) {
return -1;
}
return index.intValue();
}
}

Varun Tulsian's answer is very good, but the code is incomplete.
The DynamicSelectionCell stores each rows' options in a map. When the cell updates or renders itself, it matches the row index from your Context to its matching row list in your map.
For posterity, see the simplified and updated version below:
public class DynamicSelectionCell extends AbstractInputCell<String, String> {
interface Template extends SafeHtmlTemplates {
#Template("<option value=\"{0}\">{0}</option>")
SafeHtml deselected(String option);
#Template("<option value=\"{0}\" selected=\"selected\">{0}</option>")
SafeHtml selected(String option);
}
private static Template template;
/**
* key: rowIndex
* value: List of options to show for this row
*/
public TreeMap<Integer, List<String>> optionsMap = new TreeMap<Integer, List<String>>();
/**
* Construct a new {#link SelectionCell} with the specified options.
*
*/
public DynamicSelectionCell() {
super("change");
if (template == null) {
template = GWT.create(Template.class);
}
}
public void addOptions(List<String> newOps, int rowIndex) {
optionsMap.put(rowIndex, newOps);
}
public void removeOptions(int rowIndex) {
optionsMap.remove(rowIndex);
}
#Override
public void onBrowserEvent(Context context, Element parent, String value,
NativeEvent event, ValueUpdater<String> valueUpdater) {
super.onBrowserEvent(context, parent, value, event, valueUpdater);
String type = event.getType();
if ("change".equals(type)) {
Object key = context.getKey();
SelectElement select = parent.getFirstChild().cast();
String newValue = optionsMap.get(context.getIndex()).get(select.getSelectedIndex());
setViewData(key, newValue);
finishEditing(parent, newValue, key, valueUpdater);
if (valueUpdater != null) {
valueUpdater.update(newValue);
}
}
}
#Override
public void render(Context context, String value, SafeHtmlBuilder sb) {
// Get the view data.
Object key = context.getKey();
String viewData = getViewData(key);
if (viewData != null && viewData.equals(value)) {
clearViewData(key);
viewData = null;
}
int selectedIndex = getSelectedIndex(viewData == null ? value : viewData, context.getIndex());
sb.appendHtmlConstant("<select tabindex=\"-1\">");
int index = 0;
try {
for (String option : optionsMap.get(context.getIndex())) {
if (index++ == selectedIndex) {
sb.append(template.selected(option));
} else {
sb.append(template.deselected(option));
}
}
} catch (Exception e) {
System.out.println("error");
}
sb.appendHtmlConstant("</select>");
}
private int getSelectedIndex(String value, int rowIndex) {
if (optionsMap.get(rowIndex) == null) {
return -1;
}
return optionsMap.get(rowIndex).indexOf(value);
}
}

Or you could do something like creating a custom cell, which has methods you can call in the getValue of that particular column
say
final DynamicSelectionCell selection = new DynamicSelectionCell("...");
Column<GraphFilterCondition, String> operandColumn=new Column<GraphFilterCondition, String>(selection) {
#Override
public String getValue(FilterCondition object) {
if(object.getWhereCol()!=null){
((DynamicSelectionCell)this.getCell()).addOptions(new String[]{">","<",">="});
}
if(object.getWhereCondition()!=null){
return object.getWhereCondition().getGuiName();
}
return "";
}
};
This should work I guess.
Also check this other question

ASP.NET + AJAX + WebService: string result + out parameter

In my experience I call simple web methods, like this:
[WebMethod]
public List<string> GetUserListByLetters(string strLetters){ ... }
And here is my OnComplete JS-function:
function OnComplete(args) {
...
if (args != "") {
for (var i = 0; i < args.length; i++) {
// Do what I need with string in args[i]
}
}
...
}
For now I would like to have such method:
[WebMethod]
public string GetUserListByCountry(int countryId, out List<User> users)
{
users=null;
if ( Validate(countryId)==false )
return "wrong country Id";
users = GetUsers(countryId); // returns list of User objects.
return "";
}
Question1: should "out" parameter work in WS? I saw few article (, for example) where said it is impossible.
Question2: if it doesn't work, how should I change method signature to get that workable?
Question3: if it works, how could I access data from 'out' parameter?
Thanks.

I will use this approach:
[WebMethod]
public object GetUserListByCountry(int countryId)
{
users=null;
if ( Validate(countryId)==false )
return "wrong country Id";
users = GetUsers(countryId); // returns list of User objects.
return new {Error="", Users=users};
}
I mean that I will return complex object, its one property will contain usual value for return and another - required data.

Using a custom validator in a variable length list in Microsoft MVC 2 (client-side validation issues)

I have created a variable length list according to the many great posts by Steve Sanderson on how to do this in MVC 2. His blog has a lot of great tutorials.
I then created a custom "requiredif" conditional validator following this overview http://blogs.msdn.com/b/simonince/archive/2010/06/11/adding-client-side-script-to-an-mvc-conditional-validator.aspx
I used the JQuery validation handler from the MSDN blog entry which adds the following to a conditional-validators.js I include on my page's scripts:
(function ($) {
$.validator.addMethod('requiredif', function (value, element, parameters) {
var id = '#' + parameters['dependentProperty'];
// Get the target value (as a string, as that's what actual value will be)
var targetvalue = parameters['targetValue'];
targetvalue = (targetvalue == null ? '' : targetvalue).toString().toLowerCase();
// Get the actual value of the target control
var actualvalue = ($(id).val() == null ? '' : $(id).val()).toLowerCase();
// If the condition is true, reuse the existing required field validator functionality
if (targetvalue === actualvalue)
return $.validator.methods.required.call(this, value, element, parameters);
return true;
});
})(jQuery);
Alas, this does not cause a client-side validation to fire ... only the server-side validation fires. The inherent "required" validators DO fire client-side, meaning I have my script includes set-up correctly for basic validation. Has anyone accomplished custom validators in a variable length list in MVC 2 using JQuery as the client-side validation method?
NOTE that this same custom validator works client-side using the exact same set-up on a non-variable length list.

Turns out that it was a field ID naming issue with the way that collection IDs render in a variable length list. The validator was attempting to name the element ID of the dependent property with the expected statement of:
string depProp = viewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(Attribute.DependentProperty);
I analyzed the HTML viewsource (posted in my comment, above), and actually, [ and ] characters are not output in the HTML of the collection-index elements... they're replaced with _... so, when I changed my CustomValidator.cs to have the dependent property set to:
string depProp = viewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(Attribute.DependentProperty).Replace("[", "_").Replace("]", "_");
... then the client-side validator works since the name matches. I'll have to dig deeper to see WHY the ID is getting renamed in Sanderson's collection index method, below...
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace Sendz.WebUI.Helpers
{
public static class HtmlPrefixScopeExtensions
{
private const string IdsToReuseKey = "__htmlPrefixScopeExtensions_IdsToReuse_";
public static IDisposable BeginCollectionItem(this HtmlHelper html, string collectionName)
{
var idsToReuse = GetIdsToReuse(html.ViewContext.HttpContext, collectionName);
var itemIndex = idsToReuse.Count > 0 ? idsToReuse.Dequeue() : Guid.NewGuid().ToString();
// autocomplete="off" is needed to work around a very annoying Chrome behaviour whereby it reuses old values after the user clicks "Back", which causes the xyz.index and xyz[...] values to get out of sync.
html.ViewContext.Writer.WriteLine(
string.Format("<input type=\"hidden\" name=\"{0}.index\" autocomplete=\"off\" value=\"{1}\" />",
collectionName, html.Encode(itemIndex)));
return BeginHtmlFieldPrefixScope(html, string.Format("{0}[{1}]", collectionName, itemIndex));
}
public static IDisposable BeginHtmlFieldPrefixScope(this HtmlHelper html, string htmlFieldPrefix)
{
return new HtmlFieldPrefixScope(html.ViewData.TemplateInfo, htmlFieldPrefix);
}
private static Queue<string> GetIdsToReuse(HttpContextBase httpContext, string collectionName)
{
// We need to use the same sequence of IDs following a server-side validation failure,
// otherwise the framework won't render the validation error messages next to each item.
var key = IdsToReuseKey + collectionName;
var queue = (Queue<string>)httpContext.Items[key];
if (queue == null)
{
httpContext.Items[key] = queue = new Queue<string>();
var previouslyUsedIds = httpContext.Request[collectionName + ".index"];
if (!string.IsNullOrEmpty(previouslyUsedIds))
foreach (var previouslyUsedId in previouslyUsedIds.Split(','))
queue.Enqueue(previouslyUsedId);
}
return queue;
}
#region Nested type: HtmlFieldPrefixScope
private class HtmlFieldPrefixScope : IDisposable
{
private readonly string _previousHtmlFieldPrefix;
private readonly TemplateInfo _templateInfo;
public HtmlFieldPrefixScope(TemplateInfo templateInfo, string htmlFieldPrefix)
{
_templateInfo = templateInfo;
_previousHtmlFieldPrefix = templateInfo.HtmlFieldPrefix;
templateInfo.HtmlFieldPrefix = htmlFieldPrefix;
}
#region IDisposable Members
public void Dispose()
{
_templateInfo.HtmlFieldPrefix = _previousHtmlFieldPrefix;
}
#endregion
}
#endregion
}
}
A complete validator / attribute reference...
public class RequiredIfAttribute : ValidationAttribute
{
private RequiredAttribute innerAttribute = new RequiredAttribute();
public string DependentProperty { get; set; }
public object TargetValue { get; set; }
public RequiredIfAttribute(string dependentProperty, object targetValue)
{
this.DependentProperty = dependentProperty;
this.TargetValue = targetValue;
}
public override bool IsValid(object value)
{
return innerAttribute.IsValid(value);
}
}
public RequiredIfValidator(ModelMetadata metadata, ControllerContext context, RequiredIfAttribute attribute)
: base(metadata, context, attribute) { }
public override IEnumerable<ModelValidationResult> Validate(object container)
{
// Get a reference to the property this validation depends upon
var field = Metadata.ContainerType.GetProperty(Attribute.DependentProperty);
if (field != null)
{
// Get the value of the dependent property
var value = field.GetValue(container, null);
// Compare the value against the target value
if ((value == null && Attribute.TargetValue == null) ||
(value != null && value.ToString().ToLowerInvariant().Equals(Attribute.TargetValue.ToString().ToLowerInvariant())))
{
// A match => means we should try validating this field
if (!Attribute.IsValid(Metadata.Model))
// Validation failed - return an error
yield return new ModelValidationResult { Message = ErrorMessage };
}
}
}
public override IEnumerable<ModelClientValidationRule> GetClientValidationRules()
{
var rule = new ModelClientValidationRule()
{
ErrorMessage = ErrorMessage,
ValidationType = "requiredif"
};
var viewContext = (ControllerContext as ViewContext);
var depProp = viewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(Attribute.DependentProperty).Replace("[", "_").Replace("]", "_");
rule.ValidationParameters.Add("dependentProperty", depProp);
rule.ValidationParameters.Add("targetValue", Attribute.TargetValue.ToString());
yield return rule;
}