ExtJS reloading store on button click event with different parameter - servlets

Question

I am new to ExtJs and I am using ExtJs4.
Now As shown in below image, There is one textfield named keywords, What I want to do is When I click on the button it will pass data of textfield to servlet and display resulted record in grid.
Now I have no idea how to do this. I am receiving JSON data response from servlet but don't know how to reload the store and refresh the grid.
Below is code for my store and grid.
Ext.define("Post", {
extend: 'Ext.data.Model',
proxy: {
type: 'ajax',
url: '/ezdi/searchServlet',
method: 'POST',
reader: {
type: 'json',
root: 'rows'
//,totalProperty: 'totalCount'
}
},
fields: [{
name: 'docid',
mapping: 'docid'
}, {
name: 'mrn',
mapping: 'mrn'
}, {
name: 'fname',
mapping: 'fname'
}]
});
var gridDataStore = Ext.create('Ext.data.Store', {
model: 'Post'
});
// Data store for grid end
Ext.define('Ezdi.Grid', {
extend: 'Ext.grid.GridPanel',
alias: 'widget.ezdigrid',
initComponent: function() {
var config = {
store: gridDataStore,
columns: [{
header: "DocID",
width: 100,
sortable: true,
dataIndex: 'docid'
}, {
header: "MRN",
width: 100,
sortable: true,
dataIndex: 'mrn'
}, {
header: "FirstName",
width: 100,
sortable: true,
dataIndex: 'fname'
}],
viewConfig: {
forceFit: false,
autoLoad: false
},
loadMask: true
};
}
});

Answer 1

You could use:
{
xtype: 'button',
text: 'Search',
handler: function() {
store.clearFilter(); //clear previous search value
var searchValue = Ext.getCmp("textFieldId").getValue(); //get new value
store.load().filter('jsonGridFielName', searchValue); //load filtered data
}
}
And for for multiple textfield search:
//FILTERS
var searchValue1 = Ext.getCmp("textFieldId1").getValue(); //value1
var searchValue2 = Ext.getCmp("textFieldId2").getValue(); //value2
var noValue = "0000xxxx"; //no Value, for empty field, use value that you are sure it is not going to be searched!!!
var clear = store.clearFilter(); //shortcut
if (!searchValue1 && !searchValue2) {
clear;
store.load().filter("jsonGridFielName1", noValue);
} else if (searchValue1) {
clear;
store.load().filter('jsonGridFielName1', searchValue1);
//...else if(searchValue n...)...
} else {
clear;
store.load().filter('jsonGridFielName2', searchValue2);
}

Answer 2

ezdigrid.js
// Data store for grid start
Ext.define("Post", {
extend: 'Ext.data.Model',
proxy: {
type: 'ajax',
url: '/ezdi/searchServlet',
method: 'GET',
reader: {
type: 'json',
root: 'rows'
//,totalProperty: 'totalCount'
}
},
fields: [{
name: 'docid',
mapping: 'docid'
}, {
name: 'mrn',
mapping: 'mrn'
}, {
name: 'fname',
mapping: 'fname'
}]
});
var gridDataStore = Ext.create('Ext.data.Store', {
// pageSize: 10,
model: 'Post'
});
// Data store for grid end
Ext.define('Ezdi.Grid', {
extend: 'Ext.grid.GridPanel',
alias: 'widget.ezdigrid',
initComponent: function() {
var config = {
store: gridDataStore,
columns: [{
//id:'ms',
header: "DocID",
width: 100,
sortable: true,
dataIndex: 'docid'
}, {
header: "MRN",
width: 100,
sortable: true,
dataIndex: 'mrn'
}, {
header: "FirstName",
width: 100,
sortable: true,
dataIndex: 'fname'
}],
viewConfig: {
forceFit: false,
autoLoad: false
},
loadMask: true
}; // eo config object
// apply config
Ext.apply(this, Ext.apply(this.initialConfig, config));
// call parent
Ezdi.Grid.superclass.initComponent.apply(this, arguments);
// load the store at the latest possible moment
this.on({
afterlayout: {
scope: this,
single: true,
fn: function() {
this.store.load({
params: {
start: 0,
limit: 30
}
});
}
}
});
} // eo function initComponent
});
demo.html
//handler for button click event
fbar: [{
xtype: 'button',
text: 'Search',
handler: function() {
var value = Ext.getCmp('_keyword').getValue(); //_keyword is textField
gridDataStore.load().filter('keywords', value);
}
}]
MyServlet
keyword = request.getParameter("keywords");
//code for quesry processing

Answer 3

Use extraParams in your model.
extraParams: {
keywords: 'your-value'
}
Put following code in your button click handler.
gridDataStore.proxy.extraParams.keywords = 'new value';
gridDataStore.load();