Trying to pass following JSON from View to Controller
{
"allselected": false,
"selectedIds": ["", "all"],
"targetControl": "Studieniva",
"targetSource": "studienivalist",
"dependency": [{
"name": "ShopNo",
"selectedvalues": "311"
}, {
"name": "Institution",
"selectedvalues": ["all", "UIO"] // THIS IS COMING AS NULL AT CONTROLLER . OCCURS ONLY WHEN MULTIPLE ITEMS UNDER dependency
}]
}
Javascript code for sending request is like below (trying to make multiple requests at the same time and based on the response of each request loading some dropdowns )
var targetcontrols_array = targetControl.split(',');
var targetsource_array = targetSource.split(',');
const arrOfPromises = targetcontrols_array.map(function(item, index) {
var control_name = item;
var source = targetsource_array[index];
var request_data = JSON.stringify({ allselected: allselected_flag, selectedIds: selectedvalues, targetControl: control_name, targetSource: source, dependency: dependencyOptions });
console.log("req:"+request_data); //SAMPLE JSON ADDED On TOP
return new Promise((resolve) => {
$.ajax({
url: action_url,
type: 'POST',
traditional: true,
async: false,
data: request_data,
contentType: "application/json; charset=utf-8",
dataType: 'json',
success: function (response) {
//process response
}
})
});
});
Promise.all(arrOfPromises);
MVC controller action is like below
[HttpPost]
public JsonResult CascadingDropDown(DynamicFormSelectModel model)
{
model.dependency values are not coming correctly . Observing that the value of SelectedValues is NULL in some cases
( OCCURS ONLY WHEN MULTIPLE ITEMS UNDER dependency )
}
public class DynamicFormSelectModel
{
public bool allselected { get; set; }
public string[] selectedIds { set; get; }
public string targetSource { set; get; }
public string targetControl { set; get; }
public List dependency { set; get; }
}
public class DynamicFormDependencyOptions
{
public string Name { get; set; }
public string SelectedValues { get; set; }
}
While trying to read the request model.dependency values , sometimes getting NULL , even if values are passed from View (Example attached JSON passing 2 values "name": "Institution",
"selectedvalues": ["all", "UIO"] , but in controller i am getting NULL
. OCCURS mostly WHEN MULTIPLE ITEMS are present under dependency property and no idea why its coming as NULL
回复1public class DynamicFormDependencyOptions
{
public string Name { get; set; }
public string SelectedValues { get; set; }
}
change it to
public class DynamicFormDependencyOptions
{
public string Name { get; set; }
public string[] SelectedValues { get; set; }
}
this code has the SelectedValues as string object but the data is in string Array form
make SelectedValues a string Array and You'll get it ....
and change your following code accordingly to parse the string array like you are doing for selectedIds.