public static string GenerateClientPostBackExpression(string propertyName, ICommandBinding expression, DotvvmBindableObject control, PostbackScriptOptions options)
{
var target = (DotvvmControl?)control.GetClosestControlBindingTarget();
var uniqueControlId = target?.GetDotvvmUniqueId();
string getContextPath(DotvvmBindableObject?current)
{
var result = new List <string>();
while (current != null)
{
var pathFragment = current.GetDataContextPathFragment();
if (pathFragment != null)
{
result.Add(JsonConvert.ToString(pathFragment));
}
current = current.Parent;
}
result.Reverse();
return("[" + string.Join(",", result) + "]");
}
string getHandlerScript()
{
if (!options.AllowPostbackHandlers)
{
return("[]");
}
// turn validation off for static commands
var validationPath = expression is StaticCommandBindingExpression ? null : GetValidationTargetExpression(control);
return(GetPostBackHandlersScript(control, propertyName,
// validation handler
validationPath == null ? null :
validationPath == RootValidationTargetExpression ? "\"validate-root\"" :
validationPath == "$data" ? "\"validate-this\"" :
$"[\"validate\", {{path:{JsonConvert.ToString(validationPath)}}}]",
// use window.setTimeout
options.UseWindowSetTimeout ? "\"timeout\"" : null,
options.IsOnChange ? "\"suppressOnUpdating\"" : null,
GenerateConcurrencyModeHandler(propertyName, control)
));
}
string?generatedPostbackHandlers = null;
var adjustedExpression = expression.GetParametrizedCommandJavascript(control);
// when the expression changes the dataContext, we need to override the default knockout context fo the command binding.
var knockoutContext = options.KoContext ?? (
// adjustedExpression != expression.CommandJavascript ?
new CodeParameterAssignment(new ParametrizedCode.Builder {
"ko.contextFor(", options.ElementAccessor.Code !, ")"
}.Build(OperatorPrecedence.Max))
public static string GenerateClientPostBackScript(string propertyName, ICommandBinding expression, DotvvmControl control, PostbackScriptOptions options)
{
object uniqueControlId = null;
if (expression is ControlCommandBindingExpression)
{
var target = (DotvvmControl)control.GetClosestControlBindingTarget();
uniqueControlId = target.GetDotvvmUniqueId();
}
var arguments = new List <string>()
{
"'root'",
options.ElementAccessor,
"[" + String.Join(", ", GetContextPath(control).Reverse().Select(p => '"' + p + '"')) + "]",
(uniqueControlId is IValueBinding ? "{ expr: " + JsonConvert.ToString(((IValueBinding)uniqueControlId).GetKnockoutBindingExpression(), '\'', StringEscapeHandling.Default) + "}" : "'" + (string)uniqueControlId + "'"),
options.UseWindowSetTimeout ? "true" : "false",
JsonConvert.SerializeObject(GetValidationTargetExpression(control)),
"null",
GetPostBackHandlersScript(control, propertyName)
};
// return the script
var condition = options.IsOnChange ? "if (!dotvvm.isViewModelUpdating) " : null;
var returnStatement = options.ReturnValue != null ? $";return {options.ReturnValue.ToString().ToLower()};" : "";
// call the function returned from binding js with runtime arguments
var postBackCall = $"{expression.GetCommandJavascript()}({String.Join(", ", arguments)})";
return(condition + postBackCall + returnStatement);
}
public static string GenerateClientPostBackScript(string propertyName, ICommandBinding expression, DotvvmBindableObject control, PostbackScriptOptions options)
{
var expr = GenerateClientPostBackExpression(propertyName, expression, control, options);
if (options.ReturnValue == false)
{
return(expr + ";event.stopPropagation();return false;");
}
else
{
return(expr);
}
}
public static string GenerateClientPostBackScript(string propertyName, ICommandBinding expression, DotvvmBindableObject control, PostbackScriptOptions options)
{
var target = (DotvvmControl)control.GetClosestControlBindingTarget();
var uniqueControlId = target?.GetDotvvmUniqueId();
// return the script
string returnStatement;
if (options.ReturnValue == false)
{
returnStatement = ";event.stopPropagation();return false;";
}
else
{
returnStatement = "";
}
string generatedPostbackHanlders = null;
var call = expression.GetParametrizedCommandJavascript(control).ToString(p =>
p == CommandBindingExpression.ViewModelNameParameter ? new CodeParameterAssignment("'root'", OperatorPrecedence.Max) :
p == CommandBindingExpression.SenderElementParameter ? options.ElementAccessor :
p == CommandBindingExpression.CurrentPathParameter ? new CodeParameterAssignment(
"[" + String.Join(", ", GetContextPath(control).Reverse().Select(JavascriptCompilationHelper.CompileConstant)) + "]",
OperatorPrecedence.Max) :
p == CommandBindingExpression.ControlUniqueIdParameter ? new CodeParameterAssignment(
(uniqueControlId is IValueBinding ? "{ expr: " + JsonConvert.ToString(((IValueBinding)uniqueControlId).GetKnockoutBindingExpression(control), '\'', StringEscapeHandling.Default) + "}" : "'" + (string)uniqueControlId + "'"), OperatorPrecedence.Max) :
p == CommandBindingExpression.UseObjectSetTimeoutParameter ? new CodeParameterAssignment(options.UseWindowSetTimeout ? "true" : "false", OperatorPrecedence.Max) :
p == CommandBindingExpression.ValidationPathParameter ? CodeParameterAssignment.FromExpression(new JsLiteral(GetValidationTargetExpression(control))) :
p == CommandBindingExpression.OptionalKnockoutContextParameter ? options.KoContext ?? new CodeParameterAssignment("null", OperatorPrecedence.Max) :
p == CommandBindingExpression.CommandArgumentsParameter ? options.CommandArgs ?? new CodeParameterAssignment("undefined", OperatorPrecedence.Max) :
p == CommandBindingExpression.PostbackHandlersParameter ? new CodeParameterAssignment(generatedPostbackHanlders ?? (generatedPostbackHanlders = GetPostBackHandlersScript(control, propertyName)), OperatorPrecedence.Max) :
default(CodeParameterAssignment)
);
if (generatedPostbackHanlders == null)
{
call = $"dotvvm.applyPostbackHandlers(function(){{return {call}}}.bind(this),{options.ElementAccessor.Code.ToString(e => default(CodeParameterAssignment))},{GetPostBackHandlersScript(control, propertyName)})";
}
if (options.IsOnChange)
{
call = "if(!dotvvm.isViewModelUpdating){" + call + "}";
}
return(call + returnStatement);
}
public static string GenerateClientPostBackScript(string propertyName, ICommandBinding expression, DotvvmControl control, PostbackScriptOptions options)
{
object uniqueControlId = null;
if (expression is ControlCommandBindingExpression)
{
var target = (DotvvmControl)control.GetClosestControlBindingTarget();
uniqueControlId = target.GetDotvvmUniqueId() as string;
}
var arguments = new List<string>()
{
"'root'",
options.ElementAccessor,
"[" + String.Join(", ", GetContextPath(control).Reverse().Select(p => '"' + p + '"')) + "]",
(uniqueControlId is IValueBinding ? ((IValueBinding)uniqueControlId).GetKnockoutBindingExpression() : "'" + (string) uniqueControlId + "'"),
options.UseWindowSetTimeout ? "true" : "false",
JsonConvert.SerializeObject(GetValidationTargetExpression(control)),
"null",
GetPostBackHandlersScript(control, propertyName)
};
// return the script
var condition = options.IsOnChange ? "if (!dotvvm.isViewModelUpdating) " : null;
var returnStatement = options.ReturnValue != null ? $";return {options.ReturnValue.ToString().ToLower()};" : "";
// call the function returned from binding js with runtime arguments
var postBackCall = $"{expression.GetCommandJavascript()}({String.Join(", ", arguments)})";
return condition + postBackCall + returnStatement;
}
public static string GenerateClientPostBackExpression(string propertyName, ICommandBinding expression, DotvvmBindableObject control, PostbackScriptOptions options)
{
var target = (DotvvmControl)control.GetClosestControlBindingTarget();
var uniqueControlId = target?.GetDotvvmUniqueId();
string getContextPath(DotvvmBindableObject current)
{
var result = new List <string>();
while (current != null)
{
var pathFragment = current.GetDataContextPathFragment();
if (pathFragment != null)
{
result.Add(JsonConvert.ToString(pathFragment));
}
current = current.Parent;
}
result.Reverse();
return("[" + string.Join(",", result) + "]");
}
string getHandlerScript()
{
if (!options.AllowPostbackHandlers)
{
return("[]");
}
// turn validation off for static commands
var validationPath = expression is StaticCommandBindingExpression ? null : GetValidationTargetExpression(control);
return(GetPostBackHandlersScript(control, propertyName,
// validation handler
validationPath == null ? null :
validationPath == RootValidationTargetExpression ? "\"validate-root\"" :
validationPath == "$data" ? "\"validate-this\"" :
$"[\"validate\", {{path:{JsonConvert.ToString(validationPath)}}}]",
// use window.setTimeout
options.UseWindowSetTimeout ? "\"timeout\"" : null,
options.IsOnChange ? "\"suppressOnUpdating\"" : null,
GenerateConcurrencyModeHandler(control)
));
}
string generatedPostbackHandlers = null;
var adjustedExpression = expression.GetParametrizedCommandJavascript(control);
// when the expression changes the dataContext, we need to override the default knockout context fo the command binding.
var knockoutContext = options.KoContext ?? (
adjustedExpression != expression.CommandJavascript ?
new CodeParameterAssignment(new ParametrizedCode.Builder {
"ko.contextFor(", options.ElementAccessor.Code, ")"
}.Build(OperatorPrecedence.Max)) :
default);
var call = adjustedExpression.ToString(p =>
p == CommandBindingExpression.ViewModelNameParameter ? new CodeParameterAssignment("\"root\"", OperatorPrecedence.Max) :
p == CommandBindingExpression.SenderElementParameter ? options.ElementAccessor :
p == CommandBindingExpression.CurrentPathParameter ? new CodeParameterAssignment(
getContextPath(control),
OperatorPrecedence.Max) :
p == CommandBindingExpression.ControlUniqueIdParameter ? new CodeParameterAssignment(
(uniqueControlId is IValueBinding ? "{ expr: " + JsonConvert.ToString(((IValueBinding)uniqueControlId).GetKnockoutBindingExpression(control)) + "}" : '"' + (string)uniqueControlId + '"'), OperatorPrecedence.Max) :
p == JavascriptTranslator.KnockoutContextParameter ? knockoutContext :
p == CommandBindingExpression.CommandArgumentsParameter ? options.CommandArgs ?? default :
p == CommandBindingExpression.PostbackHandlersParameter ? new CodeParameterAssignment(generatedPostbackHandlers ?? (generatedPostbackHandlers = getHandlerScript()), OperatorPrecedence.Max) :
default(CodeParameterAssignment)
);
if (generatedPostbackHandlers == null && options.AllowPostbackHandlers)
{
return($"dotvvm.applyPostbackHandlers(function(){{return {call}}}.bind(this),{options.ElementAccessor.Code.ToString(e => default(CodeParameterAssignment))},{getHandlerScript()})");
}
else
{
return(call);
}
}
public static string GenerateClientPostBackExpression(string propertyName, ICommandBinding expression, DotvvmBindableObject control, PostbackScriptOptions options)
{
var target = (DotvvmControl)control.GetClosestControlBindingTarget();
var uniqueControlId = target?.GetDotvvmUniqueId();
string getHandlerScript()
{
// turn validation off for static commands
var validationPath = expression is StaticCommandBindingExpression ? null : GetValidationTargetExpression(control);
return(GetPostBackHandlersScript(control, propertyName,
// validation handler
validationPath == null ? null :
validationPath == RootValidationTargetExpression ? "\"validate-root\"" :
validationPath == "$data" ? "\"validate-this\"" :
$"[\"validate\", {{path:{JsonConvert.ToString(validationPath)}}}]",
// use window.setTimeout
options.UseWindowSetTimeout ? "\"timeout\"" : null,
options.IsOnChange ? "\"suppressOnUpdating\"" : null,
GenerateConcurrencyModeHandler(control)
));
}
string generatedPostbackHandlers = null;
var call = expression.GetParametrizedCommandJavascript(control).ToString(p =>
p == CommandBindingExpression.ViewModelNameParameter ? new CodeParameterAssignment("\"root\"", OperatorPrecedence.Max) :
p == CommandBindingExpression.SenderElementParameter ? options.ElementAccessor :
p == CommandBindingExpression.CurrentPathParameter ? new CodeParameterAssignment(
"[" + String.Join(", ", GetContextPath(control).Reverse().Select(JavascriptCompilationHelper.CompileConstant)) + "]",
OperatorPrecedence.Max) :
p == CommandBindingExpression.ControlUniqueIdParameter ? new CodeParameterAssignment(
(uniqueControlId is IValueBinding ? "{ expr: " + JsonConvert.ToString(((IValueBinding)uniqueControlId).GetKnockoutBindingExpression(control)) + "}" : '"' + (string)uniqueControlId + '"'), OperatorPrecedence.Max) :
p == CommandBindingExpression.OptionalKnockoutContextParameter ? options.KoContext ?? new CodeParameterAssignment("null", OperatorPrecedence.Max) :
p == CommandBindingExpression.CommandArgumentsParameter ? options.CommandArgs ?? new CodeParameterAssignment("undefined", OperatorPrecedence.Max) :
p == CommandBindingExpression.PostbackHandlersParameter ? new CodeParameterAssignment(generatedPostbackHandlers ?? (generatedPostbackHandlers = getHandlerScript()), OperatorPrecedence.Max) :
default(CodeParameterAssignment)
);
if (generatedPostbackHandlers == null)
{
return($"dotvvm.applyPostbackHandlers(function(){{return {call}}}.bind(this),{options.ElementAccessor.Code.ToString(e => default(CodeParameterAssignment))},{getHandlerScript()})");
}
else
{
return(call);
}
}
public static string GenerateClientPostBackScript(string propertyName, ICommandBinding expression, DotvvmControl control, PostbackScriptOptions options)
{
object uniqueControlId = null;
var target = (DotvvmControl)control.GetClosestControlBindingTarget();
uniqueControlId = target?.GetDotvvmUniqueId();
var arguments = new List <string>()
{
"'root'",
options.ElementAccessor,
"[" + string.Join(", ", GetContextPath(control).Reverse().Select(p => '"' + p + '"')) + "]",
(uniqueControlId is IValueBinding ? "{ expr: " + JsonConvert.ToString(((IValueBinding)uniqueControlId).GetKnockoutBindingExpression(), '\'', StringEscapeHandling.Default) + "}" : "'" + (string)uniqueControlId + "'"),
options.UseWindowSetTimeout ? "true" : "false",
JsonConvert.SerializeObject(GetValidationTargetExpression(control)),
"null",
GetPostBackHandlersScript(control, propertyName)
};
// return the script
var returnStatement = options.ReturnValue != null ? $";return {options.ReturnValue.ToString().ToLower()};" : "";
if (expression is StaticCommandBindingExpression)
{
if (arguments.Last() != "null" && arguments.Last() != "[]")
{
throw new NotSupportedException($"PostBack.Handlers are not supported for staticCommand binding");
}
// static command only requires the first argument
arguments.RemoveRange(1, arguments.Count - 1);
}
// call the function returned from binding js with runtime arguments
var postBackCall = $"{expression.GetCommandJavascript()}({string.Join(", ", arguments)})";
if (options.UseWindowSetTimeout && expression is StaticCommandBindingExpression)
{
postBackCall = "setTimeout(function(){" + postBackCall + "}.bind(this),0)";
}
if (options.IsOnChange)
{
postBackCall = $"if(!dotvvm.isViewModelUpdating){{{postBackCall}}}";
}
return(postBackCall + returnStatement);
}
