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Dynamic form fields on combobox change in extjs 4

I have a combobox and now I want to create dynamic textboxes when this combobox changes in Extjs 4 and I am following the Mvc structure from Extjs. Mycombo below

        {
                                    xtype : 'combo',
                                    store : 'product.CategoryComboBox',
                                    name: 'category',
                                    id:'category',
                                    displayField: 'name',
                                    valueField: 'idProductCategory',
                                    multiSelect : false,
                                    fieldLabel: 'Category',
                                    allowBlank: false,
                                    allowQueryAll : false,
                                    forceSelection : true,
                                    typeAhead: true,
                                    triggerAction: 'all',
                                    delimiter : ',',
                                    width: 300,
                                    queryMode:'local',
                                    listeners:{select:{fn:function(combo, value) {}
}
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3 answers


You can add FieldSet like this to your form

{
    xtype: 'fieldset',
    itemId: 'field_container',
    layout: 'anchor',
    border: 0,
    style: { padding: '0' },
    fieldDefaults: {
        // field defaults
    },
    defaultType: 'textfield'
}

so when the combo box changes its value you simply do the following



var container = this.down('fieldset[itemId="field_container"]');
container.removeAll();
var fieldsToAdd = [
    { name: 'field1', xtype: 'textfield', value: 'xxxxxx' },
    { name: 'field2', xtype: 'textfield', value: 'yyyyyyy' }
];
container.add(fieldsToAdd);

this way you can decide what the ToAdd fields contain based on the combobox value.

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Set the id to the textbox, then set listeners

your combo property like this:



listeners: {
    change: function (combo, value) {
        Ext.get('idOfYourTextfield').setValue(value);
    }
}
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The container field allows you to have multiple form fields on the same line, so you can do this:

{
    xtype: 'fieldcontainer',
    layout: 'hbox',
    items: {
        xtype: 'combo',
        // your config here
        listeners: {
            change: function () {
                this.up('fieldcontainer').add({
                    xtype: 'textfield',
                    value: this.getValue()
                });
            }
        }
    }
}

Edit

I think you will need to check if the textbox exists:

change: function () {
    var ct = this.up('fieldcontainer'),
        textField = ct.down('textfield');
    if (textField) {
        textField.setValue(this.getValue());
    } else {
        ct.add({
            xtype: 'textfield',
            value: this.getValue()
        });
    }
}
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