How to create custom ExtJS form field component?

Question

I want to create custom ExtJS form field components using other ExtJS components in it (e.g. TreePanel). How can I do it most easily?

I've read docs of Ext.form.field.Base but I don't want to define field body by fieldSubTpl. I just want to write code which creates ExtJS components and maybe some other code which gets and sets values.

Update: Summarized purposes are the followings:

• This new component should fit in the form GUI as a field. It should have label and the same alignment (label, anchor) of other fields without need of further hacking.

• Possibly, I have to write some getValue, setValue logic. I'd rather embed it into this component than making separated code which copies things into further hidden form fields that I also have to manage.

Answer 1

To extend @RobAgar 's answer, following a really simple Date Time field that I wrote for ExtJS 3 and it's quickport that I made for ExtJS 4. The important thing is the use of the Ext.form.field.Field mixin. This mixin provides a common interface for the logical behavior and state of form fields, including:

Getter and setter methods for field values Events and methods for tracking value and validity changes Methods for triggering validation

This can be used for combining multiple fields and let act them as one. For a total custom fieldtype I recommend to extend Ext.form.field.Base

Here is the example that I mentioned above. It should shoe how easy this can be done even for something like a date object where we need to format the data within the getter and setter.

Ext.define('QWA.form.field.DateTime', {
    extend: 'Ext.form.FieldContainer',
    mixins: {
        field: 'Ext.form.field.Field'
    },
    alias: 'widget.datetimefield',
    layout: 'hbox',
    width: 200,
    height: 22,
    combineErrors: true,
    msgTarget: 'side',
    submitFormat: 'c',

    dateCfg: null,
    timeCfg: null,

    initComponent: function () {
        var me = this;
        if (!me.dateCfg) me.dateCfg = {};
        if (!me.timeCfg) me.timeCfg = {};
        me.buildField();
        me.callParent();
        me.dateField = me.down('datefield')
        me.timeField = me.down('timefield')

        me.initField();
    },

    //@private
    buildField: function () {
        var me = this;
        me.items = [
        Ext.apply({
            xtype: 'datefield',
            submitValue: false,
            format: 'd.m.Y',
            width: 100,
            flex: 2
        }, me.dateCfg),
        Ext.apply({
            xtype: 'timefield',
            submitValue: false,
            format: 'H:i',
            width: 80,
            flex: 1
        }, me.timeCfg)]
    },

    getValue: function () {
        var me = this,
            value,
            date = me.dateField.getSubmitValue(),
            dateFormat = me.dateField.format,
            time = me.timeField.getSubmitValue(),
            timeFormat = me.timeField.format;
        if (date) {
            if (time) {
                value = Ext.Date.parse(date + ' ' + time, me.getFormat());
            } else {
                value = me.dateField.getValue();
            }
        }
        return value;
    },

    setValue: function (value) {
        var me = this;
        me.dateField.setValue(value);
        me.timeField.setValue(value);
    },

    getSubmitData: function () {
        var me = this,
            data = null;
        if (!me.disabled && me.submitValue && !me.isFileUpload()) {
            data = {},
            value = me.getValue(),
            data[me.getName()] = '' + value ? Ext.Date.format(value, me.submitFormat) : null;
        }
        return data;
    },

    getFormat: function () {
        var me = this;
        return (me.dateField.submitFormat || me.dateField.format) + " " + (me.timeField.submitFormat || me.timeField.format)
    }
});