code-boxx/0-JS-GET-SET-HTML-DATA.MD

## 0-JS-GET-SET-HTML-DATA.MD

      
    Raw
  

              0-JS-GET-SET-HTML-DATA.MD
            
          
    JAVASCRIPT GET & SET HTML DATA

https://code-boxx.com/set-get-html-data-attributes/
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.

  
## 1-set.html
<!DOCTYPE html>
<html>
  <head>
    <title>Set Data Attribute</title>
  </head>
  <body>
    <!-- (A) SET DATA ATTRIBUTE IN HTML START TAG -->
    <div id="demoA" data-color="red">
      This element has custom data attributes.
    </div>

    <!-- (B) SET DATA ATTRIBUTE IN JAVASCRIPT -->
    <script>
    document.getElementById("demoA").dataset.priority = "high";
    // <div id="demoA" data-color="red" data-priority="high">
    </script>
  </body>
</html>

## 2-get.html
<!DOCTYPE html>
<html>
  <head>
    <title>Get Data Attribute</title>
  </head>
  <body>
    <!-- (A) ELEMENT WITH DATA ATTRIBUTES -->
    <div id="demoB" data-color="red" data-priority="high">
      This element has custom data attributes.
    </div>

    <!-- (B) GET DATA ATTRIBUTE IN JAVASCRIPT -->
    <script>
    var el = document.getElementById("demoB");
    console.log(el.dataset.color); // red
    console.log(el.dataset.priority); // high
    </script>
  </body>
</html>

## 3-array.html
<!DOCTYPE html>
<html>
  <head>
    <title>Set Array Into Data Attribute</title>
  </head>
  <body>
    <!-- (A) DUMMY ELEMENT -->
    <div id="demoC">Dummy</div>

    <!-- (B) JAVASCRIPT -->
    <script>
    // (B1) GET HTML ELEMENT
    var el = document.getElementById("demoC");

    // (B2) SET ARRAY TO DATA ATTRIBUTE
    // dataset can only be string - json.stringify() to turn array to string
    el.dataset.array = JSON.stringify(["Red", "Green", "Blue"]);

    // (B3) GET ARRAY BACK FROM STRING
    // use json.parse() to turn encoded string back to array
    console.log(JSON.parse(el.dataset.array));
    </script>
  </body>
</html>

## 4-html-snippet.html
<!DOCTYPE html>
<html>
  <head>
    <title>Set HTML Snippet In Data Attribute</title>
  </head>
  <body>
    <!-- (A) DUMMY ELEMENTS -->
    <div id="demoD" data-snippet="<strong>Foo</strong>">Demo D</div>
    <div id="demoE">Demo E</div>

    <!-- (B) JAVASCRIPT -->
    <script>
    // (B1) GET HTML SNIPPET
    var snippet = document.getElementById("demoD").dataset.snippet;

    // (B2) SET HTML SNIPPET
    document.getElementById("demoE").innerHTML = snippet;
    </script>
  </body>
</html>

## 5-style.html
<!DOCTYPE html>
<html>
  <head>
    <title>Set CSS Style Based On Data Attribute</title>

    <!-- (A) CSS STYLES -->
    <style>
    div[data-color="red"] { background: red; }
    div[data-color="green"] { background: green; }
    div[data-color="blue"] { background: blue; }
    </style>
  </head>
  <body>
    <!-- (B) DUMMY ELEMENT -->
    <div id="demoF">Dummy</div>

    <!-- (C) JAVASCRIPT SET COLOR -->
    <script>
    function setColor (col) {
      document.getElementById("demoF").dataset.color = col;
    }
    </script>
    <input type="button" value="Red" onclick="setColor('red')">
    <input type="button" value="Green" onclick="setColor('green')">
    <input type="button" value="Blue" onclick="setColor('blue')">
  </body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Set Data Attribute</title>
	</head>
	<body>
	<!-- (A) SET DATA ATTRIBUTE IN HTML START TAG -->
	<div id="demoA" data-color="red">
	This element has custom data attributes.
	</div>

	<!-- (B) SET DATA ATTRIBUTE IN JAVASCRIPT -->
	<script>
	document.getElementById("demoA").dataset.priority = "high";
	// <div id="demoA" data-color="red" data-priority="high">
	</script>
	</body>
	</html>