IN my Flutter app I have an input form that uses a Flutter autocomplete_textfield for one field. When creating new entries the form works fine. However, I need to also be able to use the form to edit records. Loading all other fields on the form from the record to be edited is working, I cannot find how to set the initial value of the autocomplete_textfield.
Sid
You can create controller to you Search Field and use it as:
TextEditingController _controller = TextEditingController();
and in init method add:
_controller.text = 'YOUR_TEXT_HERE';
also dont forget to add a controller to AutoCompleteTextField:
AutoCompleteTextField<String>(
controller: _controller,
)
That's right. It works.
Add clearOnSubmit: false, so the value in _controller.text is not cleared when submitted if you want to keep it alive, otherwise set it to true to clear the value for a new search.
Related
I'm in serious need of passing url params with View class. Here's code:
if (!ModelState.IsValid)
{
return View(model);
}
This should not only return model based view, but also add specific param to URL (param won't change view details, but is needed as it's one of few automatically generated SessionKeys (one for each tab/window used to view app) and I know no other way to get to it, different than passing as param (it can't be generated everytime, 'cos params will change; it can't be global variable because it'll reset its value each refresh; it can't be static, because static is evul).
Oh this action is called with use of form and submit button, not actionLink or something like this.
EDIT1: I need params to stay in URL after refresh, or I need some other form of keeping data that persists through refresh/validation fail.
If I understand you correctly you have data that you need to use in generating Urls on your page? This just forms part of your ViewModel - or at least it should, since it's data that the View needs in order to render.
You can use ViewData to add any extra data that isn't part of your view model. Or, better still, add the data as members to it. Equally, if different views with different View Models require this data, add a ViewModel base class and derive from that so you can share that data.
use
RedirectToAction("actionName","controller",
new RouteValueDictionary(new {param1="value",param2="value2"});
or you can use hidden field to store the values in your page and then pass this down as and when you need them..
This handler only exist for a ListGrid.
But if you look at the docs for DynamicForm.setValidateOnExit(), it says:
If true, form items will be validated when each item's "editorExit"
handler is fired as well as when the entire form is submitted or
validated. Note that this property can also be set at the item
level to enable finer granularity validation in response to user
interaction - if true at either level, validation will occur on
editorExit.
So how can we add a EditorExitHandler to a DynamicForm or a FormItem?
EDIT :
I want to create an error panel below the form to show all errors dynamically. Each FormITem has the possibility to validate on Exit but I do not know how to capture this validation event to check if the error panel should be updated or not.
There is one method form.getErrors() and form.showError(true). By this you can acheive that. But for that also you need to setValidator for each field.
TextItem name = new TextItem("name", "Name");
name.setRequired(true);
name.setRequiredMessage("Please specify name of the Table");
NTRegExpValidator nameValidator = new NTRegExpValidator("(^[a-zA-Z0-9][\\w\\s.()_-]+)$","It should start with alphabets and can have alphanumeric values ( )_-. and space.");
name.setValidators(nameValidator);
name.addKeyUpFieldHandler(new KeyUpHandler){
form.getErrors();
form.showErrror(true);
});
DynamicForm form = new DynamicForm();
form.setField(name);
After some research, I still don't find a convincing answer. I guess it must a dev requirement
Lets say we have a class with a property called PetsName. If it is left blank on the screen I want to update the value provider so if the user doesn't enter a pet name, we force 'unnamed'. This isn't the actual scenario.. this is of course a sample, so answers like 'just set default values on a webpage, etc' won't fit this scenario : )
The main issue is we want to update the values so when you update the model it will use whatever you have overridden. I guess one idea is to remove the value and add it. When I check ModelState, it does have the updated value, however when I call TryUpdateModel, the value is not updated. Its possible what Im doing below is indeed correct and there is another issue here but I figured I'd try this first. Thanks!
//Sample case:
[HttpPost]
public ActionResult Edit(PetOwner petOwner)
{
//If pets name is not set, force to "Unknown"
if(petOwner.PetsName=="")
{
//Tried this too ModelState.Remove("PetsName");
//ModelState.Add("PetsName", new ModelState());
ModelState["PetsName"].Value = new ValueProviderResult("Unnamed", "Unnamed", CultureInfo.CurrentCulture);
}
//Get the record/relationships from DB to merge with ModelState
PetOwner petOwnerToSave = from o in ctx.PetOwners where o.PetOwnerId == petOwner.PetOwnerId select o;
TryUpdateModel(petOwnerToSave);
//Save petOwnerToSave
}
The real issue behind the scenes here is that Html.HiddenFor wasn't displaying the correct value even though TryUpdateModel was updating a value in the model to give to the view.
The issue here is that the Html helpers assume if you are rendering a view after a post, there mustve been an error (otherwise you wouldve redirected back to the view with a GET method - hence the Post Redirect Get issue)
This is described in detail at:
http://blogs.msdn.com/b/simonince/archive/2010/05/05/asp-net-mvc-s-html-helpers-render-the-wrong-value.aspx
I'm attempting to create a hierarchal menu system in rails.
My menu model is in a tree data structure, and I need to pass the parent information to the new action. The best way i found to do this was to pass the parent's id as a querystring. This works, unless validation blocks creation. The problem is that after the new view is rendered, the parameter is no longer present in the url.
Am i going the wrong way with this? Should I just be persisting the value in the session? Should i create a dropdown to pick the parent item (I'd prefer to just let the user click "Add new item here"). This must be a common issue, but I havent been able to find antything relevant.
Update: To clarify a question, I tried doing the following to pass the parameter when the view is rendered in the failure case, but the url has already been set at that point (we've already posted to the controller's base url).
format.html { render :action => "new", :parent_id=> params[:parent_id] }
I need another way to pass the parameter.
I figured it out. I just added a hidden field to hold the parent_id. When the browser requests the new form, i put the parent_id into the model object, and it's persisted on psotback.
Not 100% clear on what you are trying to achieve.
After the operation fails validation, you render the view again?
Can you not just pass the parent_id to this view as a parameter?
After a user clicks the submit button of my page, there is a textbox that is validated, and if it's invalid, I show an error message using the ModelState.AddModelError method. And I need to replace the value of this textbox and show the page with the error messages back to the user.
The problem is that I can't change the value of the textbox, I'm trying to do ViewData["textbox"] = "new value"; but it is ignored...
How can I do this?
thanks
You can use ModelState.Remove(nameOfProperty) like:
ModelState.Remove("CustomerId");
model.CustomerId = 123;
return View(model);
This will work.
I didn't know the answer as well, checked around the ModelState object and found:
ModelState.SetModelValue()
My model has a Name property which I check, if it is invalid this happens:
ModelState.AddModelError("Name", "Name is required.");
ModelState.SetModelValue("Name", new ValueProviderResult("Some string",string.Empty,new CultureInfo("en-US")));
This worked for me.
I have a situation where I want to persist a hidden value between POST's to the controller. The hidden value is modified as other values are changed. I couldn't get the hidden element to update without updating the value manually in ModelState.
I didn't like this approach as it felt odd to not be using a strongly typed reference to Model value.
I found that calling ModelState.Clear directly before returning the View result worked for me. It seemed to then pick the value up from the Model rather than the values that were submitted in the previous POST.
I think there will likely be a problem with this approach for situations when using Errors within the ModelState, but my scenario does not use Model Errors.