I have a UIPickerView that loads data to an array - it's working, but
then I have the same UIPickerView on another page that I want to display data that is saved when I select an item. This works, if the data exists in the array. If the data dose not exist an index out of range error occurs, and the app crashes.
if data[indexRow].isEmpty
{
distanceLabel.text = ""//works
}else if (){//need this code
print("data")
}else print("data")//need this code
What I need is, how can I test if the value dose not exists (has not been entered on the previous page) in the array without crashing the app.
You could check if the index is greater than or equal to the number of items in your data array.
if(index < data.count){
// When data exists
} else{
// When data does not exist
}
Related
I have a google spreadsheet that gets data logged to it via a google form.
When the form is logged each time, it triggers a script that gets values from a certain section using:
var tabNumsVal = sheet.getSheetValues(lastRow, tabOneCol.getColumn(), 1, 6)[0];
When I check the array, I can see that the array has the values such as:
0: 12
1: 24
2: 26W
3: 0
4: 0
5: 0
However when I use the following command, it puts the index numbers (0 to 5) into the array instead of the values in the array.
var tabNumsFinal = [];
for (var tabard in tabNumsVal) {
if (tabard !== "") {
tabNumsFinal.push(tabard);
}
}
It used to work but I have had to upgrade my code to Google Script v8 and it seems that this has broken the code.
I had to alter the 'for each' code block to a 'for' code block and it seems this is handling the values differently.
I am quite sure this is simple for many people but I really only touch Google Script 1 time each year. I have tried using Logger.log(tabard) to output the data to the execution log, but it just traverses the code and doesn't output anything. I figured this might be because of the !== "" operator, so I placed it above the if statement but still inside the for statement and it still outputs nothing.
I tried using Logger.log(tabNumsVal) and Logger.log(tabNumsFinal) and again it output nothing.
To recap:
The data from the form is returning correctly into the columns of the spreadsheet, hence it is showing inside the array properly. It's just that the index numbers are being output instead of the values from the array.
Since you're using for in loop, tabard is the index here.
var tabNumsFinal = [];
for (var i in tabNumsVal) {
let val = tabNumsVal[i];
if (val !== "") {
tabNumsFinal.push(val);
}
}
For in loop
I am trying to make a json array after getting each records from a grid in ExtJS 3.4.0. I want to add row number of grid as key of each row in JSON array.
var selected_value = [];
for (var i = 0; i < count; i++)
{
var rec = store.getAt(i);
selected_value[i] = rec.data;
final.push({
"i":selected_value[i],
})
}
What you do there is build an array of objects with each object containing one property called i and that property has the value of the row in it.
I guess you actually just wanted to have an array with the row objects in it, right?
final.push(selected_value[i]);
This will do the job already. No need to specify an object with associative indices.
If you're grabbing all the store's entries already or at least know the range (start and end index) you could just as well skip all the manual item picking and grab a readymade array already:
final = store.getRange();
or
final = store.getRange(from, to);
So my question is: how do I scan the JSON in angular to find the first instance of isPrimary:true and then launch a function with the GUID that is in that item.
I have a webservice whos JSON defines available Accounts with a display name and a GUID this generates a dropdown select list that calls a function with the GUID included to return full data from a web service.
In the scenario where theres only 1 OPTION I dont show the SELECT and simply call the function with the single GUID to return the data from the service. If theres no options I dont show anything other than a message.
Code below shows what I currently have.
The Spec has now changed and the data they are sending me in the first service call which defines that select list is now including a property isPrimary:true on one of the JSON object along with its GUID as per the rest
I now need to change my interface to no longer use the SELECT list and instead fire the function call to the service for the item that contains the isPrimary:true property. However there may be multiple instances where isPrimary:true exists in the returning JSON so I just want to fire the function on the first found instance of isPrimary:true
Equally if that property isnt in any of the JSON items then just fire the function on the first item in the JSON.
My current Code is below - you can see the call to retrieve the full details is from function:
vm.retrieveAccount(GUID);
Where the GUID is supplied with each JSON object
Code is:
if (data.Accounts.length > 1) {
vm.hideAcc = false;
setBusyState(false);
//wait for the user to make a selection
} else if (data.Accounts.length == 1){
vm.hideAcc = true;
// Only 1 acc - no need for drop down get first item
vm.accSelected = data.Accounts[0].UniqueIdentifier;
vm.retrieveAccount(vm.accSelected);
} else {
// Theres no accounts
// Hide Drop down and show message
setBusyState(false);
vm.hideAcc = true;
setMessageState(false, true, "There are no Accounts")
}
Sample of new JSON structure
accName: "My Acc",
isPrimary: true,
GUID: "bg111010101"
Still think that's a weird spec, but simple enough to solve. Just step through the array and return the first isPrimary match. If none are found, return the first element of the array.
var findPrimary = function(data) {
if (!(Array.isArray(data)) || data.length == 0) {
return false; // not an array, or empty array
}
for (var i=0; i<data.length; i++) {
if (data[i].isPrimary) {
return data[i]; // first isPrimary match
}
}
// nothing had isPrimary, so return the first one:
return data[0];
}
I am writing an application that shows the user a number of elements, where he has to select a few of them to process. When he does so, the application queries the DB for the rest of the data on these elements, and stacks them with their full data on the next page.
I made an HTML form loop with a checkbox next to each element, and then in Python I check for this checkbox's value to get the data.
Even when I'm just trying to query the data, ndb doesn't return anything.
pitemkeys are the ids for the elements to be queried. inpochecks is the checkbox variable.
preqitems is the dict to save the items after getting the data.
The next page queries nothing and is blank.
The comments are my original intended code, which produced lots of errors because of not querying anything.
request_code = self.request.get_all('rcode')
pitemkeys = self.request.get_all('pitemkey')
inpochecks = self.request.get_all('inpo')
preqitems = {}
#idx = 0
#for ix, pitemkey in enumerate(pitemkeys):
# if inpochecks[ix] == 'on':
# preqitems[idx] = Preqitems.get_by_id(pitemkey)
# preqitems[idx].rcode = request_code[ix]
# idx += 1
for ix, pitemkey in enumerate(pitemkeys):
preqitems[ix] = Preqitems.get_by_id(pitemkey)
#preqitems[ix].rcode = request_code[ix]
Update: When trying
preqitems = ndb.get_multi([ndb.Key(Preqitems, k) for k in pitemkeys])
preqitems returns a list full of None values, as if the db couldn't find data for these keys.. I checked the keys and for some reason they are in unicode format, could that be the reason? They look like so.
[u'T-SQ-00301-0002-0001', u'U-T-MT-00334-0007-0002', u'U-T-MT-00334-0008-0001']
Probably you need to do: int(pitemkey) or str(pitemkey), depending if you are using integer or string id
I have an array, lets call it _persons.
I am populating this array with Value Objects, lets call this object PersonVO
Each PersonVO has a name and a score property.
What I am trying to do is search the array &
//PSEUDO CODE
1 Find any VO's with same name (there should only be at most 2)
2 Do a comparison of the score propertys
3 Keep ONLY the VO with the higher score, and delete remove the other from the _persons array.
I'm having trouble with the code implementation. Any AS3 wizards able to help?
You'd better use a Dictionary for this task, since you have a designated unique property to query. A dictionary approach is viable in case you only have one key property, in your case name, and you need to have only one object to have this property at any given time. An example:
var highscores:Dictionary;
// load it somehow
function addHighscore(name:String,score:Number):Boolean {
// returns true if this score is bigger than what was stored, aka personal best
var prevScore:Number=highscores[name];
if (isNaN(prevScore) || (prevScore<score)) {
// either no score, or less score - write a new value
highscores[name]=score;
return true;
}
// else don't write, the new score is less than what's stored
return false;
}
The dictionary in this example uses passed strings as name property, that is the "primary key" here, thus all records should have unique name part, passed into the function. The score is the value part of stored record. You can store more than one property in the dictionary as value, you'll need to wrap then into an Object in this case.
you want to loop though the array and check if there are any two people with the same name.
I have another solution that may help, if not please do say.
childrenOnStage = this.numChildren;
var aPerson:array = new array;
for (var c:int = 0; c < childrenOnStage; c++)
{
if (getChildAt(c).name == "person1")
{
aPerson:array =(getChildAt(c);
}
}
Then trace the array,