java - Is there a way to set a validation and edit a long value in an editable Vaadin 8 Grid -


i have vaadin 8 grid set 1 column editable. have food.calories long (yes in case int keep in mind example , specific use case requires long):

binder<food> binder = foodgrid.geteditor().getbinder(); textfield caloriestextfield = new textfield(); binder.forfield(caloriestextfield)         .withvalidator(customcaloryvalidator::isvalidvalue, "must valid positive amount")         .withconverter(new stringtocaloriesconverter("must integer"))         .bind(food::getcalories, food::setcalories);  // line fails error because types not match. foodgrid.addcolumn(food::getcalories, new numberrenderer(mynumberformat))         .seteditorcomponent(new textfield(), food::setcalories);

unfortunately doesn't work , has following error:

inferred type 'c' type parameter 'c' not within bound; should implement 'com.vaadin.data.hasvalue'

i looked everywhere , couldn't find example of beyond simple edits. demo sampler did have more complex example using slider couldn't figure out how extrapolate example...

i understand error, it's trying map long string. can't find way add converter addcolumn make work...

firstly main issue binder did not specify generic type, needed be: 

binder<food> binder = foodgrid.geteditor().getbinder();

and not:

binder binder = foodgrid.geteditor().getbinder();

that being said there several other gotchas. first when forfield() need keep track of binding able set later column. wasn't clear @ me. need to:

binder.binding<food, long> caloriesbinder = binder.forfield(caloriestextfield)         .withvalidator(customcaloryvalidator::isvalidvalue, "must valid positive amount")         .withconverter(new stringtocaloriesconverter("must integer"))         .bind(food::getcalories, food::setcalories);

i'm not 100% sure on caloriesbinder because code different , example, need binding. take binding , do:

foodgrid.getcolumn("calories").seteditorbinding(caloriesbinding);

this allows correct editor work. in documentation example simple missed that.

the next step extremely important depending on you're displaying, add renderer otherwise can run weird issues. example if you're using long store currency need convert display currency amount. if you're using date want format it. need add renderer. way find how without compilation errors (mismatched types) was:

((grid.column<food, long>)foodgrid.getcolumn("calories")).setrenderer(new caloriesrenderer());

just completeness need enable editor with:

foodgrid.geteditor().setenabled(true);

lastly, if table part of bigger bean need call foodgrid.setitems(), cannot rely on binder.readbean() because cannot accept list. example if instead of food bean meal consisted of number of ingredients, not binder.readbean(meal) nor binder.readbean(meal.getingredients) though can binder.readbean(meal) rest of form. way make work do:

binder.readbean(meal); foodgrid.setitems(meal.getingredients);

Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more