Making a field hidden_Sencha Touch Cookbook-QQ阅读男生科幻网

Getting ready

Make sure that you have set up your development environment by following the recipes outlined in Chapter 1.

Make sure that you have followed the Getting your form ready with FormPanel recipe in this chapter.

How to do it...

Carry out the following steps:

Edit ch02_04.js and modify the code as follows by adding the hidden property:

var formBase = {
  items: [{
    xtype: 'datepickerfield',
    id: 'datefield-id',
    name: 'date',
    hidden: true,
    label: 'Date'}]
};

Deploy and access the application in the browser.

How it works...

When a field is marked as hidden, Sencha Touch uses the DOM's hide method on the element to hide that particular field.

There's more...

Let's see how we can programmatically show/hide a field.

Showing/Hiding a field at runtime

Each component in Sencha Touch supports two methods: show and hide. The show method shows the element and hide hides the element. In order to call these methods, we will have to first find the reference to the component, which can be achieved by either using the object reference or by using the Ext.getCmp() method. Given a component ID, the getCmp method returns us the component. The following code snippet demonstrates how to show an element:

var cmp = Ext.getCmp('datefield-id');
cmp.show();

To hide an element, we will have to call cmp.hide();