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Building Web Applications with LabVIEW Alexey Podolskiy
Technical Marketing Engineer
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High Level Web Connectivity Options in LabVIEW
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The way
1. Context
3. HTTP4. HTML/JS
7. Next Steps
2. Web Services
6. The Cloud5. JavaScript Libraries
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www.tinyurl.com/lvweb
https://decibel.ni.com/content/groups/web-services
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Remote Connectivity Options in LabVIEW
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LabVIEW Web Client Technologies
Native Technologies• HTTP Palette• TCP/UDP/FTP/SMTP/WebDav• LabVIEW Web Server
External Tools• LabSocket• WebPager• Cloud Dashboard
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2. Web Services
1. Context
3. HTTP4. HTML/JS
7. Next Steps
2. Web Services
6. The Cloud5. JavaScript Libraries
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What is a Web Server?
Software that accepts and responds to HTTP requests, usually from a browser.
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LabVIEW Web Services
Web Service
LabVIEW Web Services host web content and respond to HTTP requests.
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LabVIEW Web Services
Web Browser
Web Service
LabVIEW Web Services host web content and respond to HTTP requests.
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LabVIEW Web Services
Web Browser
Web Service
LabVIEWWeb Method
LabVIEW Web Services host web content and respond to HTTP requests.
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Web Service in a Project
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Web Service in a Project
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Static Content and Web Methods
Web Browser
Web Service
LabVIEWWeb Method
HTML
JS
CSS
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3. HTTP
1. Context
3. HTTP4. HTML/JS
7. Next Steps
2. Web Services
6. The Cloud5. JavaScript Libraries
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Uniform Resource Locator OR “Web Address”
scheme://domain:port/path?query_string
URL
HTTP – Hyper Text Transfer Protocol
ProtocolLocation Resource path
Query String
http://www.ni.com/exampleURL?value=“true”
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HTTP Demo –Add two numbers
http://127.0.0.1:8001/WebService1/add?b=4.5&a=3.5
Ex.
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HTTP Demo –Add two numbers
Protocol Target Web Service Name
VI Name
http://127.0.0.1:8080/WebService1/add?b=2&a=4
Query
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URL Mapping
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Browser to LabVIEW Communication
Web Browser
Web Service
LabVIEWWeb Method
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Static Content and Web Methods
Web Browser
Web Service
LabVIEWWeb Method
HTML
JS
CSS
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4. HTML/JS
1. Context
3. HTTP4. HTML/JS
7. Next Steps
2. Web Services
6. The Cloud5. JavaScript Libraries
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What is HTML?
HTML is a markup language for describing web documents (web pages). It is the Front Panel of your web application.
Ex.
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What is JavaScript?
JavaScript can change HTML content. It is the Block Diagram of your web application.
Ex.
Turn on a lightbulbJavaScript Introduction
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HTML and JavaScript Run in the Browser
Web Browser
Web Service
LabVIEWWeb Method
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AJAX
Web Browser
Web Service
LabVIEWWeb Method
Asynchronous JavaScript and XML – web applications with behind the scenes updates
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AJAX Demo –Add on Value Change
Ex.http://127.0.0.1:8001/WebClient/home.html
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Add Two Numbers on Value Change - AJAX
• LabVIEW Web Method
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AJAX
Web Browser
Web Service
LabVIEWWeb Method
Asynchronous JavaScript and XML – web applications with behind the scenes updates
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5. JavaScript Libraries
1. Context
3. HTTP4. HTML/JS
7. Next Steps
2. Web Services
6. The Cloud5. JavaScript Libraries
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JavaScript Libraries
Web Browser
Web Service
LabVIEWWeb Method
Libraries
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Graph Example
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4. The Cloud
1. Context
3. HTTP4. HTML/JS
7. Next Steps
2. Web Services
6. The Cloud5. JavaScript Libraries
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Cloud Data
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Cloud Demo
• Load Data from Cloud source
• Pass data to Google Chart
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7. Next Steps
1. Context
3. HTTP4. HTML/JS
7. Next Steps
2. Web Services
6. The Cloud5. JavaScript Libraries
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Next Steps: www.tinyurl.com/lvweb• Getting Started Series
• Context• Web Services• HTTP• HTML and JavaScript• AJAX• JavaScript Libraries
• Publishing Data Series• Text Stream• Table Display• Chart• Historian
• Misc Examples• Google Maps• Screenscrape• Your Example Here!
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7. Next Steps
1. Context
3. HTTP4. HTML/JS
7. Next Steps
2. Web Services
6. The Cloud5. JavaScript Libraries
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