Yahoo! Developer Network Home - Help

YDN Site Search

# YUI Library Examples: Connection Manager: Connection Manager GET Transaction

# Connection Manager: Connection Manager GET Transaction

To create a GET transaction using Connection Manager, you will need to construct a querystring of key-value pairs and append it to the URL. The following code example provides a step-by-step approach to creating a simple GET transaction.

Click "Send a GET Request" below to try it out, then read the description below to learn how to create a simple transaction using Connection Manager.

View example in new window.

## Using Connection Manager to Retrieve a File via HTTP GET

### Source file and dependencies

Load the Yahoo Global Object and Connection Manager source files:

<script src="yahoo.js"></script> <script src="event.js"></script> <script src="connection.js"></script>

### Assemble the Querystring

Construct a querystring with two key-value pairs of `username = anonymous` and `userid = 0`:

/* * * Create a querystring with example key-value pairs of * username and userid. Remember to encode the querystring * if and when the string contains special characters. * */ var sUrl = "php/get.php?username=anonymous&userid=0";

### The Callback Object

Create a callback object to handle the response, and pass an object literal to both `success` and `failure` handlers as the argument.

var div = document.getElementById('container'); var handleSuccess = function(o){ if(o.responseText !== undefined){ div.innerHTML = "<li>Transaction id: " + o.tId + "</li>"; div.innerHTML += "<li>HTTP status: " + o.status + "</li>"; div.innerHTML += "<li>Status code message: " + o.statusText + "</li>"; div.innerHTML += "<li>HTTP headers: <ul>" + o.getAllResponseHeaders + "</ul></li>"; div.innerHTML += "<li>Server response: " + o.responseText + "</li>"; div.innerHTML += "<li>Argument object: Object ( [foo] => " + o.argument.foo + " [bar] => " + o.argument.bar +" )</li>"; } } var handleFailure = function(o){ if(o.responseText !== undefined){ div.innerHTML = "<li>Transaction id: " + o.tId + "</li>"; div.innerHTML += "<li>HTTP status: " + o.status + "</li>"; div.innerHTML += "<li>Status code message: " + o.statusText + "</li>"; } } var callback = { success:handleSuccess, failure: handleFailure argument: { foo:"foo", bar:"bar" } };

### Initiate the GET Transaction

Call `YAHOO.util.Connect.asyncRequest` to send the request to `get.php`, and the PHP file will return the output of `$_POST` via `print_r()`. The `handleSuccess` callback will print the response object's properties, including the server response data.

var request = YAHOO.util.Connect.asyncRequest('GET', sUrl, callback);

### YUI Logger Output:

Note: You are viewing this example in debug mode with logging enabled. This can significantly slow performance.

Reload with logging
and debugging disabled.

### Connection Manager Examples:

- Connection Manager GET Transaction
- Connection Manager POST Transaction
- Connection Manager Transaction Timeout
- Retrieving a Yahoo! Weather RSS Feed
- Subscribing to Connection Manager Global Events
- Subscribing to Connection Manager's Custom Events via the Callback Object
- Dynamically Loading Node Data (included with examples for TreeView Control)
- Editor Data Post with Connection Manager (included with examples for Rich Text Editor (beta))

### More Connection Manager Resources:

- User's Guide (external)
- API Documentation
- Cheat Sheet PDF (external)

Copyright © 2007 Yahoo! Inc. All rights reserved.

Privacy Policy - Terms of Service - Copyright Policy - Job Openings