proxmox-widget-toolkit/src/form/TextField.js

Ext.define('Proxmox.form.field.Textfield', {
    extend: 'Ext.form.field.Text',
    alias: ['widget.proxmoxtextfield'],

    config: {
	skipEmptyText: true,

	deleteEmpty: false,
    },

    getSubmitData: function() {
        let me = this,
            data = null,
            val;
        if (!me.disabled && me.submitValue && !me.isFileUpload()) {
            val = me.getSubmitValue();
            if (val !== null) {
                data = {};
                data[me.getName()] = val;
            } else if (me.getDeleteEmpty()) {
		data = {};
                data.delete = me.getName();
	    }
        }
        return data;
    },

    getSubmitValue: function() {
	let me = this;

        let value = this.processRawValue(this.getRawValue());
	if (value !== '') {
	    return value;
	}

	return me.getSkipEmptyText() ? null: value;
    },

    setAllowBlank: function(allowBlank) {
	this.allowBlank = allowBlank;
	this.validate();
    },
});