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Setting a Default Value to a ComboBox using Json in ExtJS 3.4

I am trying to set a default value in a ComboBox in ExtJS 3.4 I have tried to set value: 'Standard' in the ComboBox config, but that only places a string in the box. I did some digging around and tried to setup the afterrender function, but still haven't gotten it to populate. The goal is to get the box to actually select the value and populate the box with the Json data, so that the user is able to select from subsequent ComboBoxes.
var hatComboStore = new Ext.data.JsonStore({
autoLoad: true,
fields: [
'BIN_ID',
'BIN_DESC'
],
baseParams: {
method: 'post'
},
url: 'json_bin_hat.php'
});
var hatCombo = new Ext.form.ComboBox({
allowBlank: false,
autoSelect: true,
displayField: 'BIN_DESC',
emptyText: 'Select a hat...',
fieldLabel: 'Hat',
forceSelection: false,
hiddenName: 'hatId',
itemId: 'hatId',
listEmptyText: 'No records found',
listeners: {
afterrender: function(combo, record, index) {
var hat = combo.getValue();
binCombo.store.baseParams.hat = hat;
},
select: function(combo, record, index) {
var hat = combo.getValue();
binCombo.store.baseParams.hat = hat;
},
focus: function(combo) {
binCombo.clearValue();
}
},
mode: 'remote',
msgTarget: 'side',
name: 'hatDesc',
store: hatComboStore,
submitValue: true,
triggerAction: 'all',
valueField: 'BIN_ID'
});
Anyone have any ideas? Thanks for your help!

I've got it to work using an override method.
Basically, the displayValue is what I wanted to display ('Standard') and the value is what I wanted to execute (value: 1). Apparently, the remote store is a little tricky to work with, so that's why the override was necessary.
var hatComboStore = new Ext.data.JsonStore({
autoLoad: true,
fields: [
'BIN_ID',
'BIN_DESC'
],
baseParams: {
method: 'post'
},
url: 'json_bin_hat.php'
});
var hatCombo = new Ext.form.ComboBox({
allowBlank: false,
autoSelect: true,
displayField: 'BIN_DESC',
displayValue: 'Standard',
emptyText: 'Select a hat...',
fieldLabel: 'Hat',
forceSelection: false,
hiddenName: 'hatId',
itemId: 'hatId',
listEmptyText: 'No records found',
listeners: {
afterrender: function(combo, record, index) {
var hat = combo.getValue();
binCombo.store.baseParams.hat = hat;
},
select: function(combo, record, index) {
var hat = combo.getValue();
binCombo.store.baseParams.hat = hat;
},
focus: function(combo) {
binCombo.clearValue();
}
},
mode: 'remote',
msgTarget: 'side',
name: 'hatDesc',
store: hatComboStore,
submitValue: true,
triggerAction: 'all',
valueField: 'BIN_ID'
value: 1
});
//Override method to default hatCombo value to 'Standard' while underlying value = 1
Ext.override(Ext.form.ComboBox, {
initValue: Ext.form.ComboBox.prototype.initValue.createSequence(function() {
if (this.mode == 'remote' && !!this.valueField && this.valueField != this.displayField && this.displayValue) {
if (this.forceSelection) {
this.lastSelectionText = this.displayValue;
}
this.setRawValue(this.displayValue);
}
})
});

Looks like the value prop is not working for remote stores. Probably the combo is rendered before the store has loaded. You can set the value after the store has loaded.
This works for me (tested as an ExtJS 3.4 fiddle).
var hatComboStore = new Ext.data.JsonStore({
autoLoad: true,
fields: [
'id',
'title'
],
url: 'https://jsonplaceholder.typicode.com/todos'
});
var hatCombo = new Ext.form.ComboBox({
fieldLabel: 'Hat',
store: hatComboStore,
displayField: 'title',
valueField: 'id',
mode: 'local',
submitValue: true,
triggerAction: 'all',
// Apparently does not work with remote store.
// value: '1'
});
hatComboStore.on('load', () => hatCombo.setValue('1'));
new Ext.form.FormPanel({
items: hatCombo,
renderTo: Ext.getBody()
});

see example of setting default value:
Combo config:
{
triggerAction: 'all',
id: 'dir_id',
fieldLabel: 'Direction',
queryMode: 'local',
editable: false,
xtype: 'combo',
store : dirValuesStore,
displayField:'name',
valueField:'id',
value: 'all',
width: 250,
forceSelection:true
}
source: Extjs 4 combobox default value

ExtJS 4 remove item from store

I want to delete the first item of the store:
My store code:
Ext.define('Test.store.filtros.strEstadosMtoOrganismos', {
extend: 'Ext.data.Store',
model: 'Test.model.filtros.mdlEstadosMtoOrganismos',
autoLoad: false,
proxy: {
type: 'ajax',
api: {read: 'some url'},
reader: {
type: 'json',
root: 'data',
totalProperty: 'total',
successProperty: 'success'
}
}
});
My combo code:
xtype: 'combo',
id: 'tfecomboEstados',
fieldLabel :'Estado',
queryMode: 'local',
editable: false,
displayField: 'label',
valueField: 'value',
store: 'filtros.strEstadosMtoOrganismos',
anchor: '95%'
Code of my controller:
init:function(){
this.control({
'viewFichaMtoOrganismos #tfecomboEstados':{
beforerender:this.onCargarEstadoFicha
});
},
onCargarEstadoFicha:function(){
Ext.getCmp('tfecomboEstados').getStore().removeAt(0);
}
I want to delete the first item of the store.I use the store for two combos,in one I want all the records,but in the second one I want all but the first.
And removeAt(0) is not working.

You cannot just remove record from store to affect one combo and do not another. you need different stores for your combos.
also use parameter in your listener function instead of getting it by getCmp function
onCargarEstadoFicha:function(combo){
combo.getStore().removeAt(0);
}

Ext 4 RowEditor editing cancels when first time click on ComboBox in currently edited row

I have an Ext.grid.Panel with RowEditor plugin, and it contains a column with a combobox editor:
{
dataIndex: 'parentId',
text: 'Parent category',
editor: {
store: store,
valueField: 'categoryId',
displayField: 'name',
xtype: 'combobox',
allowBlank: true
}
The store looks like this:
var store = Ext.create('Ext.data.Store', {
model: 'Category',
autoLoad: true,
proxy: {
type: 'rest',
url: 'api/categories',
reader: {
type: 'json',
root: 'categories'
}
}
});
And model:
Ext.define('Neopod.model.Category', {
extend: 'Ext.data.Model',
fields: ['categoryId', 'name', 'parentId'],
})
When editing a grid row and clicking on combobox for the first time, then ExtJS triggers data load from the server and the roweditor cancels automatically. So user expected to see combo dropdown, but combo not opened and instead the edit mode cancels.
So why does ExtJS behave this way ?

A simple handling is to configure your combobox with: queryMode: 'local' so that it doesn't try to reload whenever it is expanded.
Using your example:
{
dataIndex: 'parentId',
text: 'Parent category',
editor: {
store: store,
valueField: 'categoryId',
displayField: 'name',
xtype: 'combobox',
allowBlank: true,
queryMode: 'local'
}
}
You can also try configuring your RowEditing plugin with autoCancel: false e.g.:
Ext.create('Ext.grid.plugin.RowEditing', {
pluginId: 'rowediting',
clicksToEdit: 2,
autoCancel: false
});

ExtJs Combobox problem

Hi i have a formpanel with remote combobox, the store is jsonstore and is get from webservices with paging results, everything is well, but when you pick an option form the combo always pick the first one, you can pick the third but the combo choose the first option i don't know the reason for this the configuration for the combo is this:
{
xtype: 'combo',
fieldLabel: 'Sitio Interés',
anchor: '100%',
triggerAction: 'all',
store: dsPuntos,
mode: 'remote',
displayField: "Nombre",
valueField: "Id",
typeAhead: false,
width: 222,
hideLabel: true,
allowBlank: false,
id: 'cboDato',
editable: true,
pageSize: 20,
minChars: 0,
hideTrigger: true,
//enableKeyEvents: true,
emptyText: 'Escriba un sitio de interés',
tpl: '<tpl for="."><div class="x-combo-list-item">{Nombre} - {Municipio}</div></tpl>',
listeners: {
scope: this,
specialkey: function (f, e) {
if (e.getKey() == e.ENTER) {
Ext.getCmp('btnConsultar').handler.call(Ext.getCmp('btnConsultar').scope);
}
}
}
},
and the store is here:
var dsPuntos = new Ext.data.JsonStore({
proxy: new Ext.data.HttpProxy({
url: 'Services/MapService.svc/GetSitiosInteres',
method: 'GET'
}),
root: 'd.rows',
totalProperty: 'd.total',
id: 'Id',
fields: ['Nombre', 'Municipio', 'Id']
});
Thanks

Your store config is a little off. It should be idProperty instead of id. Also check the json coming from the server. Make sure that the id are unique.

ExtJs combo forced to select the first item (with example code)

I have a combo B that gets loaded by other combo A (triggered by 'select' listener)
once B is populated, I see all items but now from drop-down in Combo B,
I'm force to select the first item with mouse
I can select other item only by typing
Please help!!!!
code for Combo A
{
xtype: 'combo',
displayField: 'value',
emptyText: 'Please select A first',
fieldLabel: 'Combo A',
id: 'comboA',
maxHeight: 240,
mode: 'local',
triggerAction: 'all',
typeAhead: true,
typeAheadDelay: 100,
valueField: 'id',
store: new Ext.data.JsonStore({
url: '/cgi-bin/server.cgi',
fields: ['id', 'name'],
baseParams: {
action: 'getAList'
},
autoLoad: true,
root: 'aList'
}),
listeners: {
'select': {
fn: function(){
var comboB = Ext.getCmp('comboB');
comboB.clearValue();
comboB.store.removeAll();
comboB.store.reload({
params: {
id: this.getValue()
}
})
}
}
}
}
Code for combo B:
{
xtype: 'combo',
displayField: 'item',
editable: true,
emptyText: 'Select a Combo A first',
fieldLabel: 'Combo B',
id: 'comboB',
lazyInit: true,
maxHeight: 240,
mode: 'local',
triggerAction: 'all',
typeAhead: true,
valueField: 'id',
width: 220,
store: new Ext.data.JsonStore({
url: '/cgi-bin/server.cgi',
root: 'bList',
autoLoad: false,
fields: ['id,', 'item'],
baseParams: {
action: 'getBList'
},
listeners: {
'beforeload': function(){
Ext.getCmp('comboB').disable();
},
'load': function(){
Ext.getCmp('comboB').enable();
}
}
})
}

Not sure what exactly is wrong here but I suspect this piece in your comboA is not getting fired as expected -
comboB.store.reload({
params: {
id: this.getValue()
}
})
So comboB is still disabled. when you click on the comboB trigger, it loads the store and the comboB's store's load listener is kicking in as expected to enable the combo.
Try putting some debug statements or stepping through the piece of code above.