I have a QAbstractListModel called SerialPortList which represents a list of SerialPorts. Each SerialPort has a QList<int> supportedBaudRates property. The SerialPortList model's display role is simply QVariant::fromValue(mSerialPorts[i]), i.e. a SerialPort instance.
I display my list model in a Repeater like this (highly simplified):
SerialPortList {
id: ports
}
Column {
Repeater {
id: portList
// ...
model: ports
Text { text: model.display.portName }
ComboBox {
model: model.display.supportedBaudRates
// ...
}
}
}
That is, a list of the serial ports name, and then a combo box with its supported baud rates.
The weird thing is, although the text is displayed fine, apparently for the combo box model.display is undefined. If I replace the combo box with this:
Text {
text: model.display.supportedBaudRates.join(" ")
}
then it produces the result you'd expect!
What is going on here? I can only assume that model is redefined inside the ComboBox so it thinks it is referring to itself, but I've tried all kinds of id references like portList.model.display.supportedBaudRates that I can think of and none of them work.
Edit
Kakadu pointed out that you can't use a QList<int> as a model. Kind of annoying, but I've changed it to QStringList which you apparently can use. Sadly the error remains the same.
Edit 2
I changed the model: in the ComboBox to model: { console.log("model: " + model); } and it prints 1, which makes me sure that model refers to itself.
Oh I finally got it to work! It's simply a namespace problem - model is something of a magic variable so you can't use id qualifiers on it.
Fortunately model. is implicitly prepended to any variable accesses in the delegate, so I changed my code to this and it worked:
ComboBox {
model: display.supportedBaudRatesAsStrings
// ...
}
(The ...AsStrings property is a QStringList duplicate of the original QList<int> property.)
Related
Hey guys I have the following function its working ok but I think it could be better.
methods: {
onFileChange(e, filedName) {
console.log(e.target.files);
console.log(filedName);
const file = e.target.files[0];
const fileToCheck=document.getElementById(filedName);
console.log(fileToCheck);
if(filedName=='thumbnail1'){
if(fileToCheck.value!=''){
this.thumbnail1 = fileToCheck;
this.thumbnail1Url= URL.createObjectURL(file);
} else {
this.thumbnail1=null;
this.thumbnail1Url=null;
}
}
if(filedName=='thumbnail2'){
if(fileToCheck.value!=''){
console.log(fileToCheck);
this.thumbnail2=fileToCheck;
this.thumbnail2Url = URL.createObjectURL(file);
} else {this.thumbnail2=fileToCheck; this.thumbnail2Url=null;}
}
},
Instead of checking the value for
if(fieldName == "something"){
this.something = URL.createObjectURL(file)
}
I would simply pass in a string of the fieldName and bind to it dynamically by just typing this.fieldName (filedName could equal thumbnail1 or thumbnail2 or chicken for all I care I just want to be able to pass in the name of the data atrribute and bind to it that way) but when ever I do this it doesn't work. Any help here would be great.
It's not completely clear to me what you want to accomplish, but I think you're asking about creating a dynamic data property for a view component. If that's the case, there are a couple of things to consider.
First, the example you cite, this.fieldName is not correct JavaScript syntax if fieldName is a string that contains a property name. The correct version is this[fieldName].
Note, though, that you can't simply define a new data property for a Vue component by setting it to a value. That's a limitation of JavaScript that's described in the Vue documentation. If data[fieldName] is an existing property that's defined in the component's data object, then you'll be okay. Even if you don't know the value of the property, you can initialize it, for example, with a value of null and then update the value in your method. Otherwise, you'll need to add the property to an existing non-root-level property as the documentation explains.
I have a form for updating document entity.
The document entity consists of list of employees (which is an array of objects) and each employee has a post which is just a string.
I have a dropdown (kind of wrapper for vue-multiselect) which accepts the array of employees and syncs selected employee to a selectedEmployee variable in data().
And also I have a watcher for selectedEmployee which sets the post input automatically when an employee is selected in the dropdown.
So, when creating a document in the form everything's fine, however, when I update the document, then I fetch existing document from server, set selectedEmployee and set employee's post. But, the document also keeps employee's post, so the first time when I open document's form in order to update it, I don't want to automatically update document's post. I want it to be updated only when user actually selects employee himself.
But the watcher gets called the first time too.
So, imagine we have John Doe and his a manager. When I create the document, I change his post to designer. Then, I open up the document form in order to update it, and I should see that for this specific document John Doe's post is "designer", but the watcher gets called and returns the post to manager.
I tried to make a fake variable in data(), like doneFetching, but it works only if I update this var directly in watcher, which looks quite dangerous, plus, in other entities I have many different kinds of selected employees, so making tons of fake flags is not an option.
Here is real code sample (employee = representative in my case):
selectedApproveRepresentative(representative) {
if (!representative) {
this.memoData.approve_representative_id = null
return
}
this.memoData.approve_representative_id = representative.id
// Here is temporary solution, but I have many watchers for many different kinds of employees. If I move the doneFetching flag after I initialized the form, it'll be set to true, and only after that the watcher will be called
if (this.mode === 'update' && !this.doneFetching) {
this.doneFetching = true
return
}
// In normal case a representative might have or have not post, so depending on this case we set it to be empty or filled. But this should not be called the first time I open the form
this.memoData.approve_representative_post_dative_case =
representative.post_dative_case ?
representative.post_dative_case : ''
},
Here is where I initialize data:
created() {
if (this.memo) {
this.memoData = _.cloneDeep(this.memo)
this.selectedApproveRepresentative = _.cloneDeep(this.memo.approve_representative)
}
},
as I understood, your problem is the watcher executed when you init the component. Have you tried setting the immediate property of the watcher to false?
Not everybody knows that the watchers can be defined in different ways.
The simple one that everybody know
watchers: {
propertyToWatch() { //code... }
}
Passing the name of a function as 'string'
watchers: {
propertyToWatch: 'nameOfAfunctionDefinedInMethodsSection'
}
The object declaration
This one is the most descriptive way of declaring a watcher. You write it as an object with a handler property (it can be the name of a function passed as string as above), and other properties like deep to watch nested properties of an object, or in your case immediate which tells to the watcher if the should run immediately when the component is mounted.
watchers: {
propertyToWatch: {
immediate: false,
handler: function() { //code.. }
}
}
This looks to be answered many different times but I can't seem to get it working with my implementation. I am trying to format and limit the data in a sap.m.Input element. I currently have the following:
var ef_Amount = new sap.m.Input({
label: 'Amount',
textAlign: sap.ui.core.TextAlign.Right,
value: {
path: '/amount',
type: 'sap.ui.model.type.Currency'
}
});
The first problem is that it kind of breaks the data binding. When I inspect the raw data (with Fiddler) submitted to the server it is an array like this:
"amount": [1234.25,null]
The server is expecting a single number and as such has issues with the array.
When I use the following, the binding works as desired but no formatting is performed.
var ef_Amount = new sap.m.Input({
label: 'Amount',
textAlign: sap.ui.core.TextAlign.Right,
value: '{/amount}'
});
The second problem is that the data entered is not limited to numbers.
I have tried using sap.m.MaskedInput instead but I don't like the usage of the placeholders because I never know the size of the number to be entered.
And lastly, it would be nice if when focus is placed on the input field, that all formatting is removed and re-formatted again when focus lost.
Should I be looking into doing this with jQuery or even raw Javascript instead?
Thank you for looking.
the array output is a normal one according to documentation. So you need to teach your server to acccept this format or preprocess data before submission;
this type is not intended to limit your data input;
good feature, but ui5 does not support this, because the Type object has no idea about control and it's events like "focus" it only deals with data input-output. So you have to implement this functionality on your own via extending the control or something else.
I would suggest using amount and currency separately. It's likely that user should be allowed to enter only valid currency, so you can use a combobox with the suggestions of the available currencies.
So, after much work and assistance from #Andrii, I managed to get it working. The primary issue was that onfocusout broke the updating of the model and the change event from firing. Simply replacing onfocusout with onsapfocusleave took care of the issues.
The final code in the init method of my custom control:
var me = this;
var numberFormat = sap.ui.core.NumberFormat.getCurrencyInstance({maxFractionDigits: 2});
me.addEventDelegate({
onAfterRendering: function() {
// for formatting the figures initially when loaded from the model
me.bindValue({
path: me.getBindingPath('value'),
formatter: function(value) {
return numberFormat.format(value);
}
});
},
onfocusin: function() {
// to remove formatting when the user sets focus to the input field
me.bindValue(me.getBindingPath('value'));
},
onsapfocusleave: function() {
me.bindValue({
path: me.getBindingPath('value'),
formatter: function(value) {
return numberFormat.format(value);
}
});
}
});
I'm developing an application for SailfishOS using the QML language.
I want to dynamically set the id property of a Label by using an if condition.
This is my code:
Label {
id: {
if(myBool == false) {
thisText()
} else {
notThatText()
}
}
width: parent.width
horizontalAlignment: Text.AlignRight
text: ""
font.pixelSize: Theme.fontSizeLarge
}
This code is placed into my CoverPage.qml file, the one that display things on the application's cover while in background.
By doing this, the cover is simply black, nothing is displayed.
Is it possible in QML to do this?
Thanks in advance!
The Qt doc says this.
While it may look like an ordinary property, the id attribute is not an ordinary property attribute, and special semantics apply to it;
You cannot set the id of a QML component at runtime.(Correct me if I am wrong). You might find objectName property useful. But I don't understand why you are trying to assign dynamic id.
I have a use case where use a dynamic/specific id could be useful. The id could be view with Gammaray, it can help for debugging.
GridLayout {
id: layout
Repeater {
model: foo
Bar {
id: bar_X_Y // bar_{model.row}_{model.column}
}
}
}
But as far as I know, it's not possible.
I am using extjs 4.1.1a for developing some application.
I had a form consisting of two combo-boxes and an item-selector.
Based on the value selected in first combo-box , the itemselector will load its data from database. This is working fine.
My problem is, if i reselect the first combo-box the new data will be displayed in itemselector along with previous data displayed in itemseletor .That is previous data displayed in itemselector will remain there itself.
for example: name "test1" consists of ids 801,2088,5000. on selecting test1 in firstcombobox itemselector must show output as below.
and if "test2" consists of ids 6090,5040. on selecting test2 in firstcombobox itemselector must show output as below.
problem is. for first time if i select "test1" from firstcombobox , output will come as expected. if i reselect "test2" from firstcombobox , output will come as below.
as you can see, previous data displayed (marked in red rectagle) remains there itself with new data displayed (marked with green rectangle).
I want for every reselection of first combobox, previously displayed data in itemselector to be erased before printing new data on itemselector.
How can I reset the itemselector for every reselection of first combobox?
You should remove all items from the store of the itemselector by the removeAll command. After that you should load the store of the itemselector.
itemselector.store.removeAll();
itemselector.store.load();
Any solutions above solve my problem.
i found solution from Sencha Forum.
https://www.sencha.com/forum/showthread.php?142276-closed-Ext-JS-4.0.2a-itemselector-not-reloading-the-store
in the itemselector.js file, change the line marked below.
populateFromStore: function(store) {
var fromStore = this.fromField.store;
// Flag set when the fromStore has been loaded
this.fromStorePopulated = true;
// THIS LINE BELOW MUST BE CHANGED!!!!!!!!!!!!
fromStore.loadData(store.getRange()); //fromStore.add(store.getRange());
// setValue waits for the from Store to be loaded
fromStore.fireEvent('load', fromStore);
},
You need to insert...
this.reset();
at the head of the function that is inserting the data.
As an example...
Ext.override( Ext.ux.ItemSelector, {
setValue: function(val) {
this.reset();
if (!val) return;
val = val instanceof Array ? val : val.split(this.delimiter);
var rec, i, id;
for (i = 0; i < val.length; i++) {
var vf = this.fromMultiselect.valueField;
id = val[i];
idx = this.toMultiselect.view.store.findBy(function(record){
return record.data[vf] == id;
});
if (idx != -1) continue;
idx = this.fromMultiselect.view.store.findBy(function(record){
return record.data[vf] == id;
});
rec = this.fromMultiselect.view.store.getAt(idx);
if (rec) {
this.toMultiselect.view.store.add(rec);
this.fromMultiselect.view.store.remove(rec);
}
}
}
});
are u got it?
when u select that combobox frist stoe of item selector is null after store load with ur pass the para meters
for example
store.load(null),
store.proxey.url='jso.php?id='+combobox.getrawvalue(),
store.load();
like that so when ur select a value in ur combobox that time ur used a listeners to ur combobox in that listners ur used above code , select ur some value in combobox that time frist store is get null after ur pass some values to json.php then store load with responce so that time old data is remove and new data load in that store
if u post ur code i will give correct code
I ran into the same issue with ExtJS 4.2.1. I got it to work by calling reload() on the data store and then setValue() with an empty string on the item selector in the data store's reload() callback.
Ext.create("Ext.form.field.ComboBox", {
// Other properties removed for brevity
listeners: {
change: function(field, newValue, oldValue, eOpts) {
Ext.getStore("ExampleStore").reload({
callback: function() {
Ext.getCmp("ExampleItemSelector").setValue("");
}
});
}
}
});
Ext.create("Ext.data.Store", {
storeId: "ExampleStore",
// Other properties removed for brevity
});
Ext.create("Ext.form.FormPanel", {
// Other properties removed for brevity
items:[{
xtype: "itemselector",
id: "ExampleItemSelector",
// Other properties removed for brevity
}]
});
For any folks that are curious, I'm fairly convinced there's a bug in the item selector's populateFromStore() function. When the function is called, it blindly adds all of the values from the bound store (store) to the internal store (fromStore). I suspect there should be a call to fromStore.removeAll() prior to the call to fromStore.add(). Here's the relevant code from ItemSelector.js.
populateFromStore: function(store) {
var fromStore = this.fromField.store;
// Flag set when the fromStore has been loaded
this.fromStorePopulated = true;
fromStore.add(store.getRange());
// setValue waits for the from Store to be loaded
fromStore.fireEvent('load', fromStore);
},
EDIT 12/18/2013
If you've configured any callback events on the item selector (e.g. change), you may want to disable the events temporarily when you call setValue(""). For example:
var selector = Ext.getCmp("ExampleItemSelector");
selector.suspendEvents();
selector.setValue("");
selector.resumeEvents();
I had the same problem and finally I decided to modify the extjs source code, not considering it a big issue as extjs itself its saying in the start of the file
Note that this control will most likely remain as an example, and not as a core Ext form
control. However, the API will be changing in a future release and so should not yet be
treated as a final, stable API at this time.
Based on that, as jstricker guessed (and sadly I didn't read and took me a while to arrive to the same conclusion), adding fromStore.removeAll() before fromStore.add() solves the problem.
Outside of the problem (but I think it can be interesting as well), additionally, I also added listConfig: me.listConfig in the MultiSelect configuration (inside createList), that way it's possible to format each item additional options (such as images, etc.) setting in the 'itemselector' the option listConfig as it's explained in the (irrealistic) documentation.
Need to reset the store used in ItemSelector that can be done by setting Empty object like below. Also need to call clearValue() method of ItemSelector component.
store.setData({});
ItemSelectorComponent.clearValue();