code-boxx/0-JS-PASS-VAR.MD

## 0-JS-PASS-VAR.MD

      
    Raw
  

              0-JS-PASS-VAR.MD
            
          
    JAVASCRIPT PASS VARIABLES BETWEEN PAGES

https://code-boxx.com/pass-variables-between-pages-javascript/
LICENSE

Copyright by Code Boxx
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

  
## 1a-query.html
<!DOCTYPE html>
<html>
  <head>
    <title>Query String Part 1</title>
    <script>
    function go () {
      // (A) VARIABLES TO PASS
      var one = "Foo Bar",
          two = ["Hello", "World"];

      // (B) URL PARAMETERS
      var params = new URLSearchParams();
      params.append("one", one);
      params.append("two", JSON.stringify(two));

      // (C) REDIRECT
      var url = "1b-query.html?" + params.toString();
      location.href = url;
    }
    </script>
  </head>
  <body>
    <input type="button" value="GO" onclick="go()">
  </body>
</html>

## 1b-query.html
<!DOCTYPE html>
<html>
  <head>
    <title>Query String Part 2</title>
    <script>
    function get () {
      // (A) GET THE PARAMETERS
      var params = new URLSearchParams(window.location.search),
          one = params.get("one"),
          two = JSON.parse(params.get("two"));

      // (B) IT WORKS!
      console.log(one);
      console.log(two);
    }
    </script>
  </head>
  <body>
    <input type="button" value="GET" onclick="get()">
  </body>
</html>

## 2a-session-storage.html
<!DOCTYPE html>
<html>
  <head>
    <title>Session Storage Part 1</title>
    <script>
    function go () {
      // (A) VARIABLES TO PASS
      var one = "Foo Bar",
          two = ["Hello", "World"];

      // (B) SAVE TO SESSION STORAGE
      sessionStorage.setItem("one", one);
      sessionStorage.setItem("two", JSON.stringify(two));

      // (C) REDIRECT
      location.href = "2b-session-storage.html";
    }
    </script>
  </head>
  <body>
    <input type="button" value="GO" onclick="go()">
  </body>
</html>

## 2b-session-storage.html
<!DOCTYPE html>
<html>
  <head>
    <title>Session Storage Part 2</title>
    <script>
    function get () {
      // (A) GET FROM SESSION STORAGE
      var one = sessionStorage.getItem("one"),
          two = JSON.parse(sessionStorage.getItem("two"));

      // (B) IT WORKS!
      console.log(one);
      console.log(two);

      // (C) CLEAR SESSION STORAGE
      // sessionStorage.removeItem("KEY");
      // sessionStorage.clear();
    }
    </script>
  </head>
  <body>
    <input type="button" value="GET" onclick="get()">
  </body>
</html>

## 3a-local-storage.html
<!DOCTYPE html>
<html>
  <head>
    <title>Local Storage Part 1</title>
    <script>
    function go () {
      // (A) VARIABLES TO PASS
      var one = "Foo Bar",
          two = ["Hello", "World"];

      // (B) SAVE TO LOCAL STORAGE
      localStorage.setItem("one", one);
      localStorage.setItem("two", JSON.stringify(two));

      // (C) REDIRECT
      location.href = "3b-local-storage.html";
    }
    </script>
  </head>
  <body>
    <input type="button" value="GO" onclick="go()">
  </body>
</html>

## 3b-local-storage.html
<!DOCTYPE html>
<html>
  <head>
    <title>Local Storage Part 2</title>
    <script>
    function get () {
      // (A) GET FROM LOCAL STORAGE
      var one = localStorage.getItem("one"),
          two = JSON.parse(localStorage.getItem("two"));

      // (B) IT WORKS!
      console.log(one);
      console.log(two);

      // (C) CLEAR LOCAL STORAGE
      // localStorage.removeItem("KEY");
      // localStorage.clear();
    }
    </script>
  </head>
  <body>
    <input type="button" value="GET" onclick="get()">
  </body>
</html>

## 4a-cookie.html
<!DOCTYPE html>
<html>
  <head>
    <title>Cookie Part 1</title>
    <script>
    function go () {
      // (A) VARIABLES TO PASS
      var one = "Foo Bar",
          two = ["Hello", "World"];

      // (B) URL PARAMETERS + STORE INTO COOKIE
      // * WORKS, BUT NOT RECOMMENDED
      var params = new URLSearchParams();
      params.append("one", one);
      params.append("two", JSON.stringify(two));
      document.cookie = "pass=" + params.toString();

      // (C) REDIRECT
      location.href = "4b-cookie.html";
    }
    </script>
  </head>
  <body>
    <input type="button" value="GO" onclick="go()">
  </body>
</html>

## 4b-cookie.html
<!DOCTYPE html>
<html>
  <head>
    <title>Cookie Part 2</title>
    <script>
    function get () {
      // (A) GET BACK PASS VARS
      var passvars = document.cookie
        .split("; ")
        .find(row => row.startsWith("pass"))
        .substring(5);

      // (B) PARSE BACK
      var params = new URLSearchParams(passvars),
          one = params.get("one"),
          two = JSON.parse(params.get("two"));

      // (C) IT WORKS!
      console.log(one);
      console.log(two);
    }
    </script>
  </head>
  <body>
    <input type="button" value="GET" onclick="get()">
  </body>
</html>

## 5a-window.html
<!DOCTYPE html>
<html>
  <head>
    <title>New Window Part 1</title>
    <script>
    function go () {
      // (A) VARIABLES TO PASS
      var one = "Foo Bar",
          two = ["Hello", "World"];

      // (B) OPEN NEW WINDOW - JUST PASS VARIABLES TO NEW WINDOW
      var newwin = window.open("5b-window.html");
      newwin.onload = () => {
        newwin.one = one;
        newwin.two = two;
      };
    }
    </script>
  </head>
  <body>
    <input type="button" value="GO" onclick="go()">
  </body>
</html>

## 5b-window.html
<!DOCTYPE html>
<html>
  <head>
    <title>New Window Part 2</title>
    <script>
    function get () {
      console.log(one);
      console.log(two);
    }
    </script>
  </head>
  <body>
    <input type="button" value="GET" onclick="get()">
  </body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Query String Part 1</title>
	<script>
	function go () {
	// (A) VARIABLES TO PASS
	var one = "Foo Bar",
	two = ["Hello", "World"];

	// (B) URL PARAMETERS
	var params = new URLSearchParams();
	params.append("one", one);
	params.append("two", JSON.stringify(two));

	// (C) REDIRECT
	var url = "1b-query.html?" + params.toString();
	location.href = url;
	}
	</script>
	</head>
	<body>
	<input type="button" value="GO" onclick="go()">
	</body>
	</html>