Question

Am trying to put a search field with respect to a data view. There is a toolbar on top of the data view, which consists of a text field. On entering some text in the field, i want to call a search functionality. As of now, i have got hold of the listener to the text field, but the listener is called immediately after the user starts typing something in the text field.

But, what am trying to do is to start the search functionality only when the user has entered at least 3 characters in the text field.How could i do this?

Code below

View

var DownloadsPanel = {
            xtype : 'panel',
            border : false,
            title : LANG.BTDOWNLOADS,
            items : [{

                xtype : 'toolbar',
                border : true,
                baseCls : 'subMenu',
                cls : 'effect1',
                dock : 'top',
                height : 25,
                items : [{
                    xtype : 'textfield',
                    name : 'SearchDownload',
                    itemId : 'SearchDownload',
                    enableKeyEvents : true,
                    fieldLabel : LANG.DOWNLOADSF3,
                    allowBlank : true,
                    minLength : 3
                }],
{

                xtype : 'dataview',
                border : false,
                cls : 'catalogue',
                autoScroll : true,
                emptyText : 'No links to display',
                selModel : {
                    deselectOnContainerClick : false
                },
                store : DownloadsStore,
                overItemCls : 'courseView-over',
                itemSelector : 'div.x-item',
                tpl : DownloadsTpl,
                id : 'cataloguedownloads'

            }]

Controller:

init : function() {

        this.control({
             // reference to the text field in the view
                 '#SearchDownload' :{
                    change: this.SearchDownloads

            }
});

SearchDownloads : function(){
            console.log('Search functionality')

        }

UPDATE 1: i was able to get hold of the listener after three characters have been entered using the below code:

Controller

    '#SearchDownload' :{
                     keyup : this.handleonChange,       
            },

         handleonChange : function(textfield, e, eOpts){

            if(textfield.getValue().length > 3){

                console.log('Three');
            }
    }

any guidance or examples on how to perform the search in the store of the data view would be appreciated.

Answer 1

A proper way would be to subscribe yourself to the change event of the field and check if the new value has at least 3 chars before proceeding.

'#SearchDownload' :{ change: this.handleonChange }
// othoer code
handleonChange : function(textfield, newValue, oldValue, eOpts ){
      if(newValue.length >= 3){
            console.log('Three');
      }
}

Btw. I recommend you to use lowercase and ‘-‘ separated names for id’s. In your case

itemId : 'search-download'

Edit apply the filter

To apply the filter I would use filter I guess you now the field you want to filter on? Lets pretend store is a variable within your controller than you may replace the console.log() with

this.store.filter('YourFieldName', newValue);

Second param can also be a regex using the value like in the example

this.store.filter('YourFieldName', new RegExp("/\"+newValue+"$/") );

For sure you can also use a Function

this.store.filter({filterFn: function(rec) { return rec.get("YourFieldName") > 10; }});