Ext.chart.axis.Category

Hierarchy
Ext.chart.axis.Abstract
Ext.chart.axis.Axis
Ext.chart.axis.Category

A type of axis that displays items in categories. This axis is generally used to display categorical information like names of items, month names, quarters, etc. but no quantitative values. For that other type of information Number axis are more suitable.

As with other axis you can set the position of the axis and its title. For example:

var store = Ext.create('Ext.data.JsonStore', {
    fields: ['name', 'data1', 'data2', 'data3', 'data4', 'data5'],
    data: [
        {'name':'metric one', 'data1':10, 'data2':12, 'data3':14, 'data4':8, 'data5':13},
        {'name':'metric two', 'data1':7, 'data2':8, 'data3':16, 'data4':10, 'data5':3},
        {'name':'metric three', 'data1':5, 'data2':2, 'data3':14, 'data4':12, 'data5':7},
        {'name':'metric four', 'data1':2, 'data2':14, 'data3':6, 'data4':1, 'data5':23},
        {'name':'metric five', 'data1':27, 'data2':38, 'data3':36, 'data4':13, 'data5':33}                                                
    ]
});

Ext.create('Ext.chart.Chart', {
    renderTo: Ext.getBody(),
    width: 500,
    height: 300,
    store: store,
    axes: [{
        type: 'Numeric',
        grid: true,
        position: 'left',
        fields: ['data1', 'data2', 'data3', 'data4', 'data5'],
        title: 'Sample Values',
        grid: {
            odd: {
                opacity: 1,
                fill: '#ddd',
                stroke: '#bbb',
                'stroke-width': 1
            }
        },
        minimum: 0,
        adjustMinimumByMajorUnit: 0
    }, {
        type: 'Category',
        position: 'bottom',
        fields: ['name'],
        title: 'Sample Metrics',
        grid: true,
        label: {
            rotate: {
                degrees: 315
            }
        }
    }],
    series: [{
        type: 'area',
        highlight: false,
        axis: 'left',
        xField: 'name',
        yField: ['data1', 'data2', 'data3', 'data4', 'data5'],
        style: {
            opacity: 0.93
        }
    }]
});

In this example with set the category axis to the bottom of the surface, bound the axis to the name property and set as title Month of the Year.