passing parameter to server in ExtJs - servlets

Question

I am new in ExtJs.
I want to pass the value in my textbox to the server(Servlet) when I click on to the button. But as I am new to it I don't kn how to do it.
Please someone help me into this or suggest me some tutorial or example for this

Answer 1

Ext.Ajax.request can help you.
Code will be look like this:
new Ext.Button({
text: "Send to server",
handler: function () {
Ext.Ajax.request({
url: 'myPage.php',
success: function (){alert('Value has been sent!');},
failure: function (){alert('Failure of sending...');},
headers: {
'my-header': 'foo'
},
params: { foo: myTextField.getValue() }
});
}
})

Answer 2

in the url put your Servlet class name.
If you have a form with multiple buttons, for example Save, Update, Delete, you can to this :
// Your form fields ...
var buttonAdd = new Ext.Button({text:'Add', handler:addFunction});
var deleteAdd = new Ext.Button({text:'Delete', handler:deleteFunction});
function addFunction(){
Ext.Ajax.Request({
url: 'MyServlet', // you can fix a parameter like this : MyServlet?action=add
method: 'POST',
params: {
myField1: myField1.getValue()
// all your params....
}
success: function (result, request){
alert('Succesfully added ' + result.responseText);
},
failure: function (result, request){
alert('Error in server' + result.responseText);
}
});
function deleteFunction(){
Ext.Ajax.Request({
url: 'MyServlet', // you can fix a parameter like this : MyServlet?action=delete
method: 'POST',
params: {
myField1: myField1.getValue()
// all your params....
}
success: function (result, request){
alert('Succesfully added ' + result.responseText);
},
failure: function (result, request){
alert('Error in server' + result.responseText);
}
});
}
And in your Servlet, you can do this :
public void doPost(HttpServletRequest request, HttpServletResponse response){
String action = request.getParameter("action");
if(action.equals("add")){
// Your code for add method goes here
} else if(action.equals("delete")){
// Your code for delete method goes here
}
}