Bradley Holt » JavaScript

CouchApps at CouchConf NYC

Bradley Holt — Thu, 27 Oct 2011 20:05:52 +0000

Here are the slides from Monday’s CouchConf NYC session on CouchApps with CouchDB, JavaScript and HTML5:

CouchConf NYC CouchApps

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CouchApps at jQuery Conference Boston 2011

Bradley Holt — Sun, 02 Oct 2011 17:15:51 +0000

Here are the slides from today’s jQuery Conference presentation on CouchApps with CouchDB & jQuery:

jQuery Conference Boston 2011 CouchApps

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Speaking at CouchConf NYC

Bradley Holt — Thu, 29 Sep 2011 16:33:58 +0000

I’m pleased to announce that I’ll be speaking at CouchConf New York City on October 24, 2011. This event is part of the CouchConf World Tour presented by Couchbase. My talk will be on CouchApps with CouchDB, JavaScript and HTML5. From the talk description:

In this talk we’ll see how to build CouchApps using CouchDB, Javascript, and HTML5. We’ll look at related tools such as the couchapp command ine tool, the Evently jQuery plugin, the CouchDB API jQuery plugin, the CouchApp Loader, Pathbinder, and the Mustache templating framework.

CouchApps at OSCON 2011

Bradley Holt — Wed, 27 Jul 2011 23:30:23 +0000

Here are the slides from today’s OSCON presentation on CouchApps with CouchDB, JavaScript & HTML5:

OSCON 2011 CouchApps

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CouchDB jQuery Plugin Reference

Bradley Holt — Thu, 14 Jul 2011 22:18:46 +0000

I’ve had a difficult time finding documentation on the CouchDB jQuery plugin that ships with CouchDB. So, I’ve decided to create my own reference and share it with you. This should cover almost the entire CouchDB API that is available through the version of the plugin that ships with CouchDB 1.1.0.

Setup

The same-origin policy effectively requires that the HTML from which the JavaScript is loaded must be served up from CouchDB (you could instead use a reverse proxy server). This can be done by attaching an HTML document to a CouchDB document. You can do this manually, or through the use of CouchApps.

CouchDB ships with several useful JavaScript libraries, including jQuery. Here is an example of an HTML document that takes advantage of CouchDB’s included JavaScript libraries:



  
    CouchDB jQuery Examples

By default, CouchDB will use an empty string as its URL prefix. However, you can configure this before your first API call. For example:

$.couch.urlPrefix = "http://localhost:5984";

You will typically not want to change this value since the same-origin policy prevents you from accessing CouchDB databases hosted at a different origin.

Server API

Server Information

JavaScript example:

$.couch.info({
    success: function(data) {
        console.log(data);
    }
});

Resulting HTTP request:

GET http://localhost:5984/ 200 OK

Console output:

{
    "couchdb"="Welcome",
    "version"="1.1.0"
}

All DBs

JavaScript example:

$.couch.allDbs({
    success: function(data) {
        console.log(data);
    }
});

Resulting HTTP request:

GET http://localhost:5984/_all_dbs 200 OK

Console output:

[
    "_replicator",
    "_users"
]

User Signup

JavaScript example:

var userDoc = {
    _id: "org.couchdb.user:bob",
    name: "bob"
};
$.couch.signup(userDoc, "supersecurepassword", {
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    }
});

Resulting HTTP request:

PUT http://localhost:5984/_users/org.couchdb.user%3Abob 201 Created

Console output:

{
    "ok"=true,
    "id"="org.couchdb.user:bob",
    "rev"="1-230dc0625bd3c4aac735846cc152c296"
}

Login

JavaScript example:

$.couch.login({
    name: "bob",
    password: "supersecurepassword",
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    }
});

Resulting HTTP request:

POST http://localhost:5984/_session 200 OK

Console output:

{
    "ok":true,
    "name":"bob",
    "roles":[]
}

This will result in an AuthSession cookie being set and then sent back to the server on subsequent requests, authenticating the user on each request. The session length is 10 minutes by default, but can be set in CouchDB’s couch_httpd_auth.timeout configuration option.

Session

JavaScript example:

$.couch.session({
    success: function(data) {
        console.log(data);
    }
});

Resulting HTTP request:

GET http://localhost:5984/_session 200 OK

Console output:

{
    "ok":true,
    "userCtx":{
        "name":"bob",
         "roles":[]
    },
    "info":{
        "authentication_db":"_users",
        "authentication_handlers":[
            "oauth",
            "cookie",
            "default"
        ],
        "authenticated":"cookie"
    }
}

Logout

JavaScript example:

$.couch.logout({
    success: function(data) {
        console.log(data);
    }
});

Resulting HTTP request:

DELETE http://_:_@localhost:5984/_session 200 OK

Console output:

{
    "ok":true
}

This will set the AuthSession cookie to an empty string, effectively logging the client out.

Active Tasks

JavaScript example:

$.couch.activeTasks({
    success: function(data) {
        console.log(data);
    }
});

Resulting HTTP request:

GET http://localhost:5984/_active_tasks 200 OK

Console output:

[]

Server Configuration

JavaScript example:

$.couch.config({
    success: function(data) {
        console.log(data);
    }
}, "uuids", "algorithm");

Resulting HTTP request:

GET http://localhost:5984/_config/uuids/algorithm 200 OK

Console output:

"sequential"

The second and third parameters are the section and option parameters, respectively. Omit the option parameter if you’d like to retrieve the entire section. Omit both the section and option parameters if you’d like to see the entire server configuration. Add an optional fourth parameter to set the configuration option’s value, which will result in a PUT request with the value.

User DB

JavaScript example:

$.couch.userDb(function(data) {
    console.log(data);
});

Resulting HTTP request:

GET http://localhost:5984/_session 200 OK

Console output:

{
    "name"="_users",
    "uri"="../_users/"
}

The URI will be relative to the HTML executing the script.

New UUID

JavaScript example:

var uuid = $.couch.newUUID();
console.log(uuid);

Resulting HTTP request:

GET http://localhost:5984/_uuids?count=1 200 OK

Console output:

d12ee5ea1df6baa2b06451f44a0156fa

This function takes a count parameter as an optional first parameter. If the count parameter is greater than one, then it will keep a cache of UUIDs that will be returned on subsequent calls, rather than making another request to the server.

Replicate

JavaScript example:

$.couch.replicate("mydb", "otherdb", {
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    }
}, {
    create_target: true
});

Resulting HTTP request:

POST http://localhost:5984/_replicate 200 OK

Console output:

{
    "ok":true,
    "session_id":"705797bae87456c52f5b76f44fe5f245",
    "source_last_seq":27,
    "replication_id_version":2,
    "history":[
        {
            "session_id":"705797bae87456c52f5b76f44fe5f245",
            "start_time":"Wed, 13 Jul 2011 22:40:09 GMT",
            "end_time":"Wed, 13 Jul 2011 22:40:09 GMT",
            "start_last_seq":0,
            "end_last_seq":27,
            "recorded_seq":27,
            "missing_checked":0,
            "missing_found":14,
            "docs_read":14,
            "docs_written":14,
            "doc_write_failures":0
        }
    ]
}

Database API

Create Database

JavaScript example:

$.couch.db("mydb").create({
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    }
});

Resulting HTTP request:

PUT http://localhost:5984/mydb/ 201 Created

Console output:

{
    "ok":true
}

Database Info

JavaScript example:

$.couch.db("mydb").info({
    success: function(data) {
        console.log(data);
    }
});

Resulting HTTP request:

GET http://localhost:5984/mydb/ 200 OK

Console output:

{
    "db_name":"mydb",
    "doc_count":0,
    "doc_del_count":0,
    "update_seq":0,
    "purge_seq":0,
    "compact_running":false,
    "disk_size":79,
    "instance_start_time":"1310597000825187",
    "disk_format_version":5,
    "committed_update_seq":0
}

Save New Document

JavaScript example:

var doc = {};
$.couch.db("mydb").saveDoc(doc, {
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    }
});

Resulting HTTP request:

POST http://localhost:5984/mydb/ 201 Created

Console output:

{
    "ok":true,
    "id":"d12ee5ea1df6baa2b06451f44a019ab9",
    "rev":"1-967a00dff5e02add41819138abb3284d"
}

Open Document

JavaScript example:

$.couch.db("mydb").openDoc("d12ee5ea1df6baa2b06451f44a019ab9", {
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    }
});

Resulting HTTP request:

GET http://localhost:5984/mydb/d12ee5ea1df6baa2b06451f44a019ab9 200 OK

Console output:

{
    "_id":"d12ee5ea1df6baa2b06451f44a019ab9",
    "_rev":"1-967a00dff5e02add41819138abb3284d"
}

Note that the HTTP response includes an Etag HTTP header. If you do a subsequent request for the same document, and your client supports caching and conditional HTTP requests, then an If-None-Match header should be sent using the value from the previous response’s Etag header. If the document has not been modified, then CouchDB will send a 304 Not Modified response and no response body, saving bandwidth and speeding up the response.

Save Updated Document

JavaScript example:

var doc = {
    _id: "d12ee5ea1df6baa2b06451f44a019ab9",
    _rev: "1-967a00dff5e02add41819138abb3284d",
    foo: "bar"
};
$.couch.db("mydb").saveDoc(doc, {
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    }
});

Resulting HTTP request:

PUT http://localhost:5984/mydb/d12ee5ea1df6baa2b06451f44a019ab9 201 Created

Console output:

{
    "ok":true,
    "id":"d12ee5ea1df6baa2b06451f44a019ab9",
    "rev":"2-13839535feb250d3d8290998b8af17c3"
}

Remove Document

JavaScript example:

var doc = {
    _id: "d12ee5ea1df6baa2b06451f44a019ab9",
    _rev: "2-13839535feb250d3d8290998b8af17c3"
};
$.couch.db("mydb").removeDoc(doc, {
     success: function(data) {
         console.log(data);
    },
    error: function(status) {
        console.log(status);
    }
});

Resulting HTTP request:

DELETE http://localhost:5984/mydb/d12ee5ea1df6baa2b06451f44a019ab9?rev=2-13839535… 200 OK

Console output:

{
    "id":d12ee5ea1df6baa2b06451f44a019ab9
    "ok":true,
    "rev":"3-1f04f977685e1108b4664f70b09c6f65"
}

Bulk Save

JavaScript example:

$.couch.db("mydb").bulkSave({"docs": [{}, {}]}, {
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    }
});

Resulting HTTP request:

POST http://localhost:5984/mydb/_bulk_docs?successStatus=201 201 Created

Console output:

[
    {
        "id":"d12ee5ea1df6baa2b06451f44a01a0d8",
        "rev":"1-967a00dff5e02add41819138abb3284d"
    },
    {
        "id":"d12ee5ea1df6baa2b06451f44a01a75a",
        "rev":"1-967a00dff5e02add41819138abb3284d"
    }
]

Bulk Remove

JavaScript example:

var docs = [
    {
        _id: "d12ee5ea1df6baa2b06451f44a01a0d8",
        _rev: "1-967a00dff5e02add41819138abb3284d"
    },
    {
        _id: "d12ee5ea1df6baa2b06451f44a01a75a",
        _rev: "1-967a00dff5e02add41819138abb3284d"
    }
];
$.couch.db("mydb").bulkRemove({"docs": docs}, {
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    }
});

Resulting HTTP request:

POST http://localhost:5984/mydb/_bulk_docs?successStatus=201 201 Created

Console output:

[
    {
        "id":"d12ee5ea1df6baa2b06451f44a01a0d8",
        "rev":"2-eec205a9d413992850a6e32678485900"
    },
    {
        "id":"d12ee5ea1df6baa2b06451f44a01a75a",
        "rev":"2-eec205a9d413992850a6e32678485900"
    }
]

This operates almost exactly like the bulk save, but instead sets the deleted flag to true on the documents.

All Documents

JavaScript example:

$.couch.db("mydb").allDocs({
    success: function(data) {
        console.log(data);
    }
});

Resulting HTTP request:

GET http://localhost:5984/mydb/_all_docs 200 OK

Console output:

{
    "total_rows":11,
    "offset":0,
    "rows":[
        {
            "id":"_design/default",
            "key":"_design/default",
            "value":{
                "rev":"9-5212dde9da06f1933dbe29811fc380d4"
            }
        },
        {
            "id":"d12ee5ea1df6baa2b06451f44a002cef",
            "key":"d12ee5ea1df6baa2b06451f44a002cef",
            "value":{
                "rev":"1-967a00dff5e02add41819138abb3284d"
            }
        },
        …
    ]
}

All Design Documents

JavaScript example:

$.couch.db("mydb").allDesignDocs({
    success: function(data) {
        console.log(data);
    }
});

Resulting HTTP request:

GET 
http://localhost:5984/mydb/_all_docs?startkey=%22_design%22&endkey=%22_design0%22 200 OK

Console output:

{
    "total_rows":11,
    "offset":0,
    "rows":[
        {
            "id":"_design/default",
            "key":"_design/default",
            "value":{
                "rev":"9-5212dde9da06f1933dbe29811fc380d4"
            }
        }
    ]
}

All Apps

JavaScript example:

$.couch.db("tutorial").allApps({
    success: function(data) {
        console.log(data);
    },
    eachApp: function(appName, appPath, ddoc) {
        console.log(appName);
        console.log(appPath);
        console.log(ddoc);
    }
});

Resulting HTTP requests:

GET http://localhost:5984/tutorial/_all_docs?startkey=%22_design%22&endkey=%22_design0%22 200 OK

GET http://localhost:5984/tutorial/_design/tutorial 200 OK

Console output:

tutorial

/tutorial/_design/tutorial/index.html

{
    "_id":"_design/tutorial",
    "_rev":"5-276897ecff6dc272c0b9143aa23e8a2e",
    …
}

This is intended as a convenience to find metadata about CouchApps.

Query

JavaScript example:

var mapFunction = function(doc) {
    emit();
};
$.couch.db("mydb").query(mapFunction, "_count", "javascript", {
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    },
    reduce: false
});

Resulting HTTP request:

POST http://localhost:5984/mydb/_temp_view?reduce=false 200 OK

Console output:

{
    "total_rows":10,
    "offset":0,
    "rows":[
        {
            "id":"d12ee5ea1df6baa2b06451f44a002cef",
            "key":null,
            "value":null
        },
        {
            "id":"d12ee5ea1df6baa2b06451f44a0037b5",
            "key":null,
            "value":null
        },
        {
            "id":"d12ee5ea1df6baa2b06451f44a003b06",
            "key":null,
            "value":null
        },
        …
    ]
}

This creates a temporary view as defined by your map and reduce functions. Temporary views are useful in development, but should be replaced with views permanently saved to design documents for production. Temporary views are slow, especially with a large number of documents.

View

JavaScript example:

$.couch.db("mydb").view("default/all", {
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    },
    reduce: false
});

Resulting HTTP request:

GET http://localhost:5984/mydb/_design/default/_view/all?reduce=false 200 OK

Console output:

{
    "total_rows":10,
    "offset":0,
    "rows":[
        {
            "id":"d12ee5ea1df6baa2b06451f44a002cef",
            "key":null,
            "value":null
        },
        {
            "id":"d12ee5ea1df6baa2b06451f44a0037b5",
            "key":null,
            "value":null
        },
        {
            "id":"d12ee5ea1df6baa2b06451f44a003b06",
            "key":null,
            "value":null
        },
        …
    ]
}

List

JavaScript example:

$.couch.db("mydb").list("default/all", "all", {
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    },
    reduce: false
});

Resulting HTTP request:

GET http://localhost:5984/mydb/_design/default/_list/all/all?reduce=false 200 OK

The console output will depend on your list’s behavior.

Compact

JavaScript example:

$.couch.db("mydb").compact({
    success: function(data) {
        console.log(data);
    }
});

Resulting HTTP request:

POST http://localhost:5984/mydb/_compact 202 Accepted

Console output:

{
    "ok":true
}

View Cleanup

JavaScript example:

$.couch.db("mydb").viewCleanup({
    success: function(data) {
        console.log(data);
    }
});

Resulting HTTP request:

POST http://localhost:5984/mydb/_view_cleanup 202 Accepted

Console output:

{
    "ok":true
}

Compact View

JavaScript example:

$.couch.db("mydb").compactView("default", {
    success: function(data) {
        console.log(data);
    }
});

Resulting HTTP request:

POST http://localhost:5984/mydb/_compact/default 202 Accepted

Console output:

{
    "ok":true
}

Changes

JavaScript example:

$.couch.db("mydb").changes().onChange(function(data) {
    console.log(data);
});

Resulting HTTP requests:

GET http://localhost:5984/mydb/ 200 OK

GET http://localhost:5984/mydb/_changes?heartbeat=10000&feed=longpoll&since=34 200 OK

This will keep a connection open until changes are detected, and then open up another connection to listen for subsequent changes starting from the next sequence.

Console output when a new document is created:

{
    "results":[
        {
            "seq":35,
            "id":"d12ee5ea1df6baa2b06451f44a01b7b5",
            "changes":[
                {
                    "rev":"1-967a00dff5e02add41819138abb3284d"
                }
            ]
        }
    ],
    "last_seq":35
}

This is very powerful feature. It allows you to listen for any changes to documents in the database and immediately respond to those changes.

Copy Document

JavaScript example:

$.couch.db("mydb").copyDoc("d12ee5ea1df6baa2b06451f44a01b7b5", {
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    }
}, {
    beforeSend: function(xhr) {
        xhr.setRequestHeader("Destination", "aNewDocId");
    }
});

Resulting HTTP request:

COPY http://localhost:5984/mydb/d12ee5ea1df6baa2b06451f44a01b7b5 201 Created

Console output:

{
    "id":"aNewDocId",
    "rev":"1-967a00dff5e02add41819138abb3284d"
}

Drop Database

JavaScript example:

$.couch.db("mydb").drop({
    success: function(data) {
        console.log(data);
    },
    error: function(status) {
        console.log(status);
    }
});

Resulting HTTP request:

DELETE http://localhost:5984/mydb/ 200 OK

Console output:

{
    "ok":true
}

I’ll be giving a presentation on CouchApps at OSCON if you want to learn more about building CouchApps. This presentation will be a part of the JavaScript and HTML5 track. You can save 20% on registration with the code OS11RAD. I’ll also be presenting a tutorial on Learning CouchDB at OSCON Data.

You can also check out my books Writing and Querying MapReduce Views in CouchDB and Scaling CouchDB if you’re interested in learning more about CouchDB in general.

Update (7/15/2011): Max Ogden has pointed me to Dale Harvey‘s documentation generator for jquery.couch.js and a copy of the generated jQuery CouchDB documentation. Max and Dale are also working on a more flexible jquery.couch2.js.

O’Reilly Radar on CouchDB and HTML5

Bradley Holt — Thu, 30 Jun 2011 15:59:10 +0000

I was recently interviewed by Audrey Watters of O’Reilly Radar on what CouchDB can do for HTML5, web apps and mobile. We discussed CouchDB, CouchApps, JavaScript, HTML5, web applications, mobile application development (Android/iOS), Web Storage, IndexedDB, replication, and “ground computing”. Read the full interview for the details of what we talked about.

I’ll be giving a presentation on CouchApps at OSCON if you want to learn more about CouchApps, JavaScript, and HTML5. This presentation will be a part of the JavaScript and HTML5 track. You can save 20% on registration with the code OS11RAD. I’ll also be presenting a tutorial on Learning CouchDB at OSCON Data.

You can also check out my books Writing and Querying MapReduce Views in CouchDB and Scaling CouchDB if you’re interested in learning more about CouchDB in general.

CouchDB 1.1 Released

Bradley Holt — Tue, 07 Jun 2011 21:40:11 +0000

CouchDB 1.1 was released this past Friday. CouchBase has a CouchDB Release 1.1 Feature Guide that provides details on the new features available in CouchDB 1.1. Some of the key new features include:

A replicator database that stores replications which are automatically restarted when the server restarts
Native SSL support—you can now connect to CouchDB securely without maintaining a separate proxy server that handles SSL
HTTP range requests—this allows for resumable downloads and skippable audio and video streams
HTTP proxying—allows external content to be served from your CouchDB URL
Map functions now support CommonJS—this allows for reuse of JavaScript code
More granular ETags on view responses—this increases the probability of a 304 Not Modified response when doing conditional requests

See the CouchDB Release 1.1 Feature Guide for the complete list and more detail.

CouchDB 1.0 Released

Bradley Holt — Wed, 14 Jul 2010 16:25:59 +0000

Apache CouchDB is a free/open source RESTful JSON document (NoSQL) database with map reduce views and peer-based replication. Version 1.0 was just released today and is 300% faster than the previous version and includes Microsoft Windows support, an authentication system, and flexible replicator options. The New York Times, ReadWriteEnterprise and InfoWorld covered the release. Couchio has a clever release announcement as well. I’ve been reading up on CouchDB since Matthew Weier O’Phinney‘s presentation on Document Databases at the last Burlington, VT PHP Users Group meeting and I may have some projects where CouchDB will be a good fit.

TEK·X Arrival and Day Zero

Bradley Holt — Wed, 19 May 2010 01:20:04 +0000

Yesterday I arrived in Chicago for my first TEK·X PHP conference. After getting in, I had an interesting conversation with Bill Karwin over dinner. Bill is the author of SQL Antipatterns and is presenting on SQL Injection Myths and Fallacies as well as Models for Hierarchical Data with SQL and PHP here at TEK·X. I was able to pick his brain on a wide range of topics including his thoughts on NoSQL and Object-Relational Mappers (ORMs). I tend to be skeptical of both (although there are certainly uses for both) and I got the sense from our conversation that my skepticism is well founded.

Today was tutorial day, or day zero. This morning I attended Arne Blankerts’ Bad Guy For a Day – A Websecurity hands-on tutorial. I liked that he took a step back and looked at the different types of security such as the transport layer, infrastructure layer, data warehouse, user interface design, user level security, and application level security. He talked about the usual suspects such as cross-site scripting (XSS), session fixation, cross-site request forgery (XSRF), and SQL injection. Filtering input and escaping output was also addressed, of course. He demonstrated attacks on several security holes in an (intentionally) badly written application. Take a look at the slides for more details.

This afternoon I attended Ed Finkler’s JavaScript for PHP Developers talk. Like most PHP developers, I find myself often working with other web technologies such as JavaScript. The object model in JavaScript is very different than in PHP and I found Ed’s explanations of these differences very helpful. The JavaScript core language is often confused with the Document Object Model (DOM) API and a clear explanation of the line between the two was also useful. His slides don’t appear to be posted yet, but I’ll link to them once they are.

One last note: if you happen to be here at TEK·X then be sure to rate the sessions on joind.in. The speakers really appreciate the feedback!

Bradley Holt » JavaScript

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2. Exploring RabbitMQ and PHP

1. CouchDB jQuery Plugin Reference

CouchApps at CouchConf NYC

CouchApps at jQuery Conference Boston 2011

Speaking at CouchConf NYC

CouchApps at OSCON 2011

CouchDB jQuery Plugin Reference

Setup

Server API

Server Information

All DBs

User Signup

Login

Session

Logout

Active Tasks

Server Configuration

User DB

New UUID

Replicate

Database API

Create Database

Database Info

Save New Document

Open Document

Save Updated Document

Remove Document

Bulk Save

Bulk Remove

All Documents

All Design Documents

All Apps

Query

View

List

Compact

View Cleanup

Compact View

Changes

Copy Document

Drop Database

O’Reilly Radar on CouchDB and HTML5

CouchDB 1.1 Released

CouchDB 1.0 Released

TEK·X Arrival and Day Zero