Class Ext.Component

Specify the id of the element, a DOM element or an existing Element corresponding to a DIV that is already present in the document that specifies some structural markup for this component.

A tag name or DomHelper spec used to create the Element which will encapsulate this Component.

You do not normally need to specify this. For the base classes Ext.Component, Ext.BoxComponent, and Ext.Container, this defaults to 'div'. The more complex Ext classes use a more complex DOM structure created by their own onRender methods.

This is intended to allow the developer to create application-specific utility Components encapsulated by different DOM elements. Example usage:

{
    xtype: 'box',
    autoEl: {
        tag: 'img',
        src: 'http://www.example.com/example.jpg'
    }
}, {
    xtype: 'box',
    autoEl: {
        tag: 'blockquote',
        html: 'autoEl is cool!'
    }
}, {
    xtype: 'container',
    autoEl: 'ul',
    cls: 'ux-unordered-list',
    items: {
        xtype: 'box',
        autoEl: 'li',
        html: 'First list item'
    }
}

An array of events that, when fired, should be bubbled to any parent container. See Ext.util.Observable.enableBubble. Defaults to [].

The CSS class used to to apply to the special clearing div rendered directly after each form field wrapper to provide field clearing (defaults to 'x-form-clear-left').

Note: this config is only used when this Component is rendered by a Container which has been configured to use the FormLayout layout manager (e.g. Ext.form.FormPanel or specifying layout:'form') and either a fieldLabel is specified or isFormField=true is specified.

See Ext.layout.FormLayout.fieldTpl also.

Optional. Specify an existing HTML element, or the id of an existing HTML element to use as the content for this component.

• Description :
  This config option is used to take an existing HTML element and place it in the layout element of a new component (it simply moves the specified DOM element after the Component is rendered to use as the content.
• Notes :
  The specified HTML element is appended to the layout element of the component after any configured HTML has been inserted, and so the document will not contain this element at the time the render event is fired.
  The specified HTML element used will not participate in any layout scheme that the Component may use. It is just HTML. Layouts operate on child items.
  Add either the x-hidden or the x-hide-display CSS class to prevent a brief flicker of the content before it is rendered to the panel.

An optional extra CSS class that will be added to this component's container. This can be useful for adding customized styles to the container or any of its children using standard CSS rules. See Ext.layout.ContainerLayout.extraCls also.

Note: ctCls defaults to '' except for the following class which assigns a value by default:

ctCls: 'x-box-layout-ct custom-class'

The label text to display next to this Component (defaults to '').

Note: this config is only used when this Component is rendered by a Container which has been configured to use the FormLayout layout manager (e.g. Ext.form.FormPanel or specifying layout:'form').

Also see hideLabel and Ext.layout.FormLayout.fieldTpl.

new Ext.FormPanel({
    height: 100,
    renderTo: Ext.getBody(),
    items: [{
        xtype: 'textfield',
        fieldLabel: 'Name'
    }]
});

true to completely hide the label element (label and separator). Defaults to false. By default, even if you do not specify a fieldLabel the space will still be reserved so that the field will line up with other fields that do have labels. Setting this to true will cause the field to not reserve that space.

Note: see the note for clearCls.

new Ext.FormPanel({
    height: 100,
    renderTo: Ext.getBody(),
    items: [{
        xtype: 'textfield'
        hideLabel: true
    }]
});

How this component should be hidden. Supported values are 'visibility' (css visibility), 'offsets' (negative offset position) and 'display' (css display).

Note: the default of 'display' is generally preferred since items are automatically laid out when they are first shown (no sizing is done while hidden).

The unique id of this component (defaults to an auto-assigned id). You should assign an id if you need to be able to access the component later and you do not have an object reference available (e.g., using Ext.getCmp).

Note that this id will also be used as the element id for the containing HTML element that is rendered to the page for this component. This allows you to write id-based CSS rules to style the specific instance of this component uniquely, and also to select sub-elements using this component's id as the parent.

Note: to avoid complications imposed by a unique id also see itemId and ref.

Note: to access the container of an item see ownerCt.

Note: this config is only used when this Component is rendered by a Container which has been configured to use the FormLayout layout manager (e.g. Ext.form.FormPanel or specifying layout:'form').

An additional CSS class to apply to the div wrapping the form item element of this field. If supplied, itemCls at the field level will override the default itemCls supplied at the container level. The value specified for itemCls will be added to the default class ('x-form-item').

Since it is applied to the item wrapper (see Ext.layout.FormLayout.fieldTpl), it allows you to write standard CSS rules that can apply to the field, the label (if specified), or any other element within the markup for the field.

Note: see the note for fieldLabel.

// Apply a style to the field's label:
<style>
    .required .x-form-item-label {font-weight:bold;color:red;}
</style>

new Ext.FormPanel({
    height: 100,
    renderTo: Ext.getBody(),
    items: [{
        xtype: 'textfield',
        fieldLabel: 'Name',
        itemCls: 'required' //this label will be styled
    },{
        xtype: 'textfield',
        fieldLabel: 'Favorite Color'
    }]
});

An itemId can be used as an alternative way to get a reference to a component when no object reference is available. Instead of using an id with Ext.getCmp, use itemId with Ext.Container.getComponent which will retrieve itemId's or id's. Since itemId's are an index to the container's internal MixedCollection, the itemId is scoped locally to the container -- avoiding potential conflicts with Ext.ComponentMgr which requires a unique id.

var c = new Ext.Panel({ //
    height: 300,
    renderTo: document.body,
    layout: 'auto',
    items: [
        {
            itemId: 'p1',
            title: 'Panel 1',
            height: 150
        },
        {
            itemId: 'p2',
            title: 'Panel 2',
            height: 150
        }
    ]
})
p1 = c.getComponent('p1'); // not the same as Ext.getCmp()
p2 = p1.ownerCt.getComponent('p2'); // reference via a sibling

Also see id and ref.

Note: to access the container of an item see ownerCt.

The separator to display after the text of each fieldLabel. This property may be configured at various levels. The order of precedence is:

Note: see the note for clearCls.

Also see hideLabel and Ext.layout.FormLayout.fieldTpl.

new Ext.FormPanel({
    height: 100,
    renderTo: Ext.getBody(),
    layoutConfig: {
        labelSeparator: '~'   // layout config has lowest priority (defaults to ':')
    },
    labelSeparator: '>>',     // config at container level
    items: [{
        xtype: 'textfield',
        fieldLabel: 'Field 1',
        labelSeparator: '...' // field/component level config supersedes others
    },{
        xtype: 'textfield',
        fieldLabel: 'Field 2' // labelSeparator will be '='
    }]
});

A CSS style specification string to apply directly to this field's label. Defaults to the container's labelStyle value if set (e.g., Ext.layout.FormLayout.labelStyle , or '').

Note: see the note for clearCls.

Also see hideLabel and Ext.layout.FormLayout.fieldTpl.

new Ext.FormPanel({
    height: 100,
    renderTo: Ext.getBody(),
    items: [{
        xtype: 'textfield',
        fieldLabel: 'Name',
        labelStyle: 'font-weight:bold;'
    }]
});

A path specification, relative to the Component's ownerCt specifying into which ancestor Container to place a named reference to this Component.

The ancestor axis can be traversed by using '/' characters in the path. For example, to put a reference to a Toolbar Button into the Panel which owns the Toolbar:

var myGrid = new Ext.grid.EditorGridPanel({
    title: 'My EditorGridPanel',
    store: myStore,
    colModel: myColModel,
    tbar: [{
        text: 'Save',
        handler: saveChanges,
        disabled: true,
        ref: '../saveButton'
    }],
    listeners: {
        afteredit: function() {
//          The button reference is in the GridPanel
            myGrid.saveButton.enable();
        }
    }
});

In the code above, if the ref had been 'saveButton' the reference would have been placed into the Toolbar. Each '/' in the ref moves up one level from the Component's ownerCt.

Also see the added and removed events.

Specify the id of the element, a DOM element or an existing Element that this component will be rendered into.

See render also.

An array of events that, when fired, should trigger this component to save its state (defaults to none). stateEvents may be any type of event supported by this component, including browser or custom events (e.g., ['click', 'customerchange']).

See stateful for an explanation of saving and restoring Component state.

See stateful for an explanation of saving and restoring Component state.

A flag which causes the Component to attempt to restore the state of internal properties from a saved state on startup. The component must have either a stateId or id assigned for state to be managed. Auto-generated ids are not guaranteed to be stable across page loads and cannot be relied upon to save and restore the same state for a component.

For state saving to work, the state manager's provider must have been set to an implementation of Ext.state.Provider which overrides the set and get methods to save and recall name/value pairs. A built-in implementation, Ext.state.CookieProvider is available.

To set the state provider for the current page:

Ext.state.Manager.setProvider(new Ext.state.CookieProvider({
    expires: new Date(new Date().getTime()+(1000*60*60*24*7)), //7 days from now
}));

A stateful Component attempts to save state when one of the events listed in the stateEvents configuration fires.

To save state, a stateful Component first serializes its state by calling getState. By default, this function does nothing. The developer must provide an implementation which returns an object hash which represents the Component's restorable state.

The value yielded by getState is passed to Ext.state.Manager.set which uses the configured Ext.state.Provider to save the object keyed by the Component's stateId, or, if that is not specified, its id.

During construction, a stateful Component attempts to restore its state by calling Ext.state.Manager.get passing the stateId, or, if that is not specified, the id.

The resulting object is passed to applyState. The default implementation of applyState simply copies properties into the object, but a developer may override this to support more behaviour.

You can perform extra processing on state save and restore by attaching handlers to the beforestaterestore, staterestore, beforestatesave and statesave events.

new Ext.Panel({
    title: 'Some Title',
    renderTo: Ext.getBody(),
    width: 400, height: 300,
    layout: 'form',
    items: [{
        xtype: 'textarea',
        style: {
            width: '95%',
            marginBottom: '10px'
        }
    },
        new Ext.Button({
            text: 'Send',
            minWidth: '100',
            style: {
                marginBottom: '10px'
            }
        })
    ]
});