xxl007

IP camera appliance with Ubuntu on a Raspberry Pi 3

Setup - Raspberry Pi 3 with camera module

Hardware bill of materials and setup instructions

Install Ubuntu 18.04 LTS (32 bit)

Link to the Ubuntu 18.04 image for the Raspberry Pi 3

Install PiCamera (python interface to camera)

xxl007

import os
import imp
import shutil
import pkgutil
import logging

from optparse import make_option

from django.core.management.base import BaseCommand, CommandError

xxl007

// Using the trim method (trimLeft and trimRight methods also exist)

var txtBox = document.getElementById("test");
var line = txtBox.value.split("\n");
var resultString = "";

for (var i=0; i < lines.length; i++) {
  var strng = lines[i].trim();
  resultString += strng + "-";
}

xxl007

// get textarea string and split on new lines
var txtBox = document.getElementById("inputbox");
var lines = txtBox.value.split("\n");

// generate HTML version of text
var resultString = "<p>";
for (var i = 0; i < lines.length ; i++) {
  resultString += lines[i] + "<br />";
}
resultString += "</p>";

xxl007

// embedded into html tags <script type="text/javascript"></script>

window.onload = function() {
  // get keyword list
  var keywordList = prompt("Enter keywords, separated by commas","");
  
  // use split to create array of keywords
  var arrayList = keywordList.split(",");
  
  // build result HTML

xxl007

//Use a combination of the typeof operator, the valueof method (shared by all objects) and the length property of String objects

// true if variable exists, is a string, and has a length greater than zero
if ((
  (typeof unkownVariable != "undefined") 
   && (typeof unknownVariable.valueOf() == "string")
   && (unknownVariable.length > 0)
   )) {
  
}

xxl007

// use the indexOf String method to locate start and end of substring to extract
// then extract the string with the substring String method

var sentence = "This is one sentence. Here comes the bit to copy: start .. end.";
var start = sentence.indexOf(":");
var end = sentence.indexOf(".", start+1); // start searching at position start+1 to avoid first dot

var list = sentence.substring(start+1, end);

xxl007

// Use the String object's built-in indexOf method to find the position of the substring if it exists:

var testValue = "This is Cookbook's test string";
var subsValue = "Cookbook";

var iValue = testValue.indexOf(subsValue, 5); 
// returns index position of first character of substring, (would have returned -1 if not found)
// second parameter indicates index where search is to be started

//alternative

xxl007

// Use the equality operator (==) within a conditional test:

var strName = prompt("What's your name?", "");

if (strName.toUpperCase () == "SHELLEY") {   // case sensitive operator!
  alert("Your name is Shelley! Good for you!");
}else{
  alert("Your name isn't Shelley. Bummer.");
}

xxl007

var numValue = 23.45;
var total "And the total is " + numValue; // string has "And the total is 23.45"

// the javascript engine first converts the other data type's value into a string before concatenating