code-boxx/0-JS-GET-FORM-DATA.MD

## 0-JS-GET-FORM-DATA.MD

      
    Raw
  

              0-JS-GET-FORM-DATA.MD
            
          
    JAVASCRIPT GET HTML FORM DATA

https://code-boxx.com/get-html-form-data-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.

  
## 1-basic-post.html
<!DOCTYPE html>
<html>
  <head>
    <title>Form Data POST</title>
    <meta charset="utf-8">
    <link rel="stylesheet" href="x-cosmetics.css">
  </head>
  <body>
    <!-- (A) HTML FORM -->
    <form id="demoA" onsubmit="return doForm()">
      <input type="text" name="name" required value="Jon Doe">
      <input type="email" name="email" required value="jon@doe.com">
      <input type="submit" value="Go!">
    </form>

    <!-- (B) JS PROCESSING -->
    <script>
    function doForm () {
      // (B1) FORM DATA - AUTO GET ALL FIELDS FROM "#DEMOA"
      var data = new FormData(document.getElementById("demoA"));

      // (B2) AJAX FETCH
      fetch("SERVER-SCRIPT", { method:"post", body:data })
      .then(res => res.text())
      .then(txt => console.log(txt))
      .catch(err => console.error(err));

      // (B3) PREVENT DEFAULT FORM SUBMIT
      return false;
    }
    </script>
  </body>
</html>

## 2-basic-params.html
<!DOCTYPE html>
<html>
  <head>
    <title>Form Data URL PARAMS</title>
    <meta charset="utf-8">
    <link rel="stylesheet" href="x-cosmetics.css">
  </head>
  <body>
    <!-- (A) HTML FORM -->
    <form id="demoB" onsubmit="return doForm()">
      <input type="text" name="name" required value="Joe Doe">
      <input type="email" name="email" required value="joe@doe.com">
      <input type="submit" value="Go!">
    </form>

    <!-- (B) JS PROCESSING -->
    <script>
    function doForm () {
      // (B1) FORM DATA - AUTO GET ALL FIELDS FROM "#DEMOB"
      var data = new FormData(document.getElementById("demoB"));

      // (B2) TO URL PARAMS
      var params = new URLSearchParams(data).toString();

      // (B3) AJAX FETCH
      fetch("SERVER-SCRIPT?" + params)
      .then(res => res.text())
      .then(txt => console.log(txt))
      .catch(err => console.error(err));

      // (B4) OR REDIRECT - MIGHT AS WELL JUST SUBMIT THE FORM?
      // location.href = "SERVER-SCRIPT?" + params;

      // (B5) PREVENT DEFAULT FORM SUBMIT
      return false;
    }
    </script>
  </body>
</html>

## 3-append-more.html
<!DOCTYPE html>
<html>
  <head>
    <title>Form Data APPEND</title>
    <meta charset="utf-8">
    <link rel="stylesheet" href="x-cosmetics.css">
  </head>
  <body>
    <!-- (A) HTML FORM -->
    <form id="demoC" onsubmit="return doForm()">
      <input type="text" name="name" required value="Joy Doe">
      <input type="email" name="email" required value="joy@doe.com">
      <div id="birthday">12 Mar 2077</div>
      <input type="submit" value="Go!">
    </form>

    <!-- (B) JS PROCESSING -->
    <script>
    function doForm () {
      // (B1) FORM DATA - AUTO GET ALL FIELDS FROM "#DEMOC"
      var data = new FormData(document.getElementById("demoC"));

      // (B2) MANUALLY APPEND MORE
      data.append("birthday", document.getElementById("birthday").innerText);
      data.append("gender", "female");
      data.append("key", "value");

      // (B3) FORM DATA YOGA
      data.delete("key");
      var name = data.get("name"); // Joy Doe
      var hasEmail = data.has("email"); // true
      for (let k of data.keys()) { console.log(k); }
      for (let v of data.values()) { console.log(v); }
      for (let [k, v] of data.entries()) { console.log(k, v); }

      // (B4) PREVENT DEFAULT FORM SUBMIT
      return false;
    }
    </script>
  </body>
</html>

## x-cosmetics.css
/* (X) NOT IMPORTANT */
* {
  font-family: Arial, Helvetica, sans-serif;
  box-sizing: border-box;
}
form {
  max-width: 600px;
  padding: 20px;
  border: 2px solid #ddd;
  background: #f2f2f2;
}
input {
  display: block;
  width: 100%;
  padding: 10px;
}
input[type=text], input[type=email] { margin-bottom: 10px; }
input[type=submit] { margin-top: 20px; cursor: pointer; }
	<!DOCTYPE html>
	<html>
	<head>
	<title>Form Data POST</title>
	<meta charset="utf-8">
	<link rel="stylesheet" href="x-cosmetics.css">
	</head>
	<body>
	<!-- (A) HTML FORM -->
	<form id="demoA" onsubmit="return doForm()">
	<input type="text" name="name" required value="Jon Doe">
	<input type="email" name="email" required value="jon@doe.com">
	<input type="submit" value="Go!">
	</form>

	<!-- (B) JS PROCESSING -->
	<script>
	function doForm () {
	// (B1) FORM DATA - AUTO GET ALL FIELDS FROM "#DEMOA"
	var data = new FormData(document.getElementById("demoA"));

	// (B2) AJAX FETCH
	fetch("SERVER-SCRIPT", { method:"post", body:data })
	.then(res => res.text())
	.then(txt => console.log(txt))
	.catch(err => console.error(err));

	// (B3) PREVENT DEFAULT FORM SUBMIT
	return false;
	}
	</script>
	</body>
	</html>
	/* (X) NOT IMPORTANT */
	* {
	font-family: Arial, Helvetica, sans-serif;
	box-sizing: border-box;
	}
	form {
	max-width: 600px;
	padding: 20px;
	border: 2px solid #ddd;
	background: #f2f2f2;
	}
	input {
	display: block;
	width: 100%;
	padding: 10px;
	}
	input[type=text], input[type=email] { margin-bottom: 10px; }
	input[type=submit] { margin-top: 20px; cursor: pointer; }