code-boxx/0-JS-UPLOAD-PROGRESS.MD

## 0-JS-UPLOAD-PROGRESS.MD

      
    Raw
  

              0-JS-UPLOAD-PROGRESS.MD
            
          
    JAVASCRIPT FILE UPLOAD PROGRESS BAR

https://code-boxx.com/ajax-upload-progress-bar/
NOTES


Accessing upload.html use http://. NOT file://.
The server-side upload handler is in PHP, you need to create your own upload handler if using other languages.

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.

  
## upload.css
/* (A) WRAPPER */
#up-wrap, #up-wrap * {
  font-family: Arial, Helvetica, sans-serif;
  box-sizing: border-box;
}
#up-wrap {
  max-width: 400px;
  padding: 20px;
  margin: 20px;
  background: #f1f1f1;
}
#up-wrap h2 { margin: 0 0 15px 0; }

/* (B) PROGRESS BAR */
#up-progress, #up-bar, #up-percent { height: 30px; }
#up-progress {
  position: relative;
  background: #fff;
}
#up-bar {
  background: #d3e3ff;
  width: 0;
  transition: width 0.5s;
}
#up-percent {
  position: absolute; top: 0; left: 0;
  width: 100%; display: flex;
  align-items: center; justify-content: center;
}

/* (C) FILE PICKER */
#up-file { display: none; }
#up-label {
  display: inline-block;
  margin-top: 20px;
  padding: 10px 20px;
  color: #fff;
  border: 1px solid #dfdfdf;
  background: #296cd0;
  cursor: pointer;
}
#up-file:disabled ~ #up-label { background: #b1b1b1; }

/* (X) DOES NOT MATTER */
body { padding: 0; margin: 0; }

## upload.html
<!DOCTYPE html>
<html>
  <head>
    <title>AJAX Upload</title>
    <link rel="stylesheet" href="upload.css">
    <script src="upload.js"></script>
  </head>
  <body>
    <div id="up-wrap">
      <h2>UPLOAD FILE</h2>

      <!-- (A) PROGRESS BAR -->
      <div id="up-progress">
        <div id="up-bar"></div>
        <div id="up-percent">0%</div>
      </div>

      <!-- (B) FILE PICKER -->
      <input type="file" id="up-file" disabled>
      <label for="up-file" id="up-label">
        Select File
      </label>
    </div>
  </body>
</html>

## upload.js
var uprog = {
  // (A) INIT
  hBar : null,     // html progress bar
  hPercent : null, // html upload percentage
  hFile : null,    // html file picker
  init : () => {
    // (A1) GET HTML ELEMENTS
    uprog.hBar = document.getElementById("up-bar");
    uprog.hPercent = document.getElementById("up-percent");
    uprog.hFile = document.getElementById("up-file");

    // (A2) ATTACH AJAX UPLOAD + ENABLE UPLOAD
    uprog.hFile.onchange = uprog.upload;
    uprog.hFile.disabled = false;
  },

  // (B) HELPER - UPDATE PROGRESS BAR
  update : percent => {
    percent = percent + "%";
    uprog.hBar.style.width = percent;
    uprog.hPercent.innerHTML = percent;
    if (percent == "100%") { uprog.hFile.disabled = false; }
  },

  // (C) PROCESS UPLOAD
  upload : () => {
    // (C1) GET FILE + UPDATE HTML INTERFACE
    let file = uprog.hFile.files[0];
    uprog.hFile.disabled = true; // disable upload button
    uprog.hFile.value = ""; // reset file picker

    // (C2) AJAX UPLOAD
    let xhr = new XMLHttpRequest(),
        data = new FormData();
    data.append("upfile", file);
    xhr.open("POST", "upload.php");

    // (C3) UPLOAD PROGRESS
    let percent = 0, width = 0;
    xhr.upload.onloadstart = evt => uprog.update(0);
    xhr.upload.onloadend = evt => uprog.update(100);
    xhr.upload.onprogress = evt => {
      percent = Math.ceil((evt.loaded / evt.total) * 100);
      uprog.update(percent);
    };

    // (C4) ON LOAD & ERRORS
    xhr.onload = function () {
      if (this.response!= "OK" || this.status!=200) {
        // @TODO - DO SOMETHING ON ERROR
        // alert("ERROR!");
        // reset form?
        console.log(this);
        console.log(this.response);
        console.log(this.status);
      } else {
        uprog.update(100);
        // @TODO - DO SOMETHING ON COMPLETE
      }
    };
    xhr.onerror = err => console.error(err);

    // (C5) GO!
    xhr.send(data);
  }
};
window.addEventListener("load", uprog.init);

## upload.php
<?php
// (A) MOVE UPLOADED FILE
$source = $_FILES["upfile"]["tmp_name"];
$destination = $_FILES["upfile"]["name"];
move_uploaded_file($source, $destination);

// (B) RESPONSE
echo "OK";
	/* (A) WRAPPER */
	#up-wrap, #up-wrap * {
	font-family: Arial, Helvetica, sans-serif;
	box-sizing: border-box;
	}
	#up-wrap {
	max-width: 400px;
	padding: 20px;
	margin: 20px;
	background: #f1f1f1;
	}
	#up-wrap h2 { margin: 0 0 15px 0; }

	/* (B) PROGRESS BAR */
	#up-progress, #up-bar, #up-percent { height: 30px; }
	#up-progress {
	position: relative;
	background: #fff;
	}
	#up-bar {
	background: #d3e3ff;
	width: 0;
	transition: width 0.5s;
	}
	#up-percent {
	position: absolute; top: 0; left: 0;
	width: 100%; display: flex;
	align-items: center; justify-content: center;
	}

	/* (C) FILE PICKER */
	#up-file { display: none; }
	#up-label {
	display: inline-block;
	margin-top: 20px;
	padding: 10px 20px;
	color: #fff;
	border: 1px solid #dfdfdf;
	background: #296cd0;
	cursor: pointer;
	}
	#up-file:disabled ~ #up-label { background: #b1b1b1; }

	/* (X) DOES NOT MATTER */
	body { padding: 0; margin: 0; }
	<!DOCTYPE html>
	<html>
	<head>
	<title>AJAX Upload</title>
	<link rel="stylesheet" href="upload.css">
	<script src="upload.js"></script>
	</head>
	<body>
	<div id="up-wrap">
	<h2>UPLOAD FILE</h2>

	<!-- (A) PROGRESS BAR -->
	<div id="up-progress">
	<div id="up-bar"></div>
	<div id="up-percent">0%</div>
	</div>

	<!-- (B) FILE PICKER -->
	<input type="file" id="up-file" disabled>
	<label for="up-file" id="up-label">
	Select File
	</label>
	</div>
	</body>
	</html>
	var uprog = {
	// (A) INIT
	hBar : null, // html progress bar
	hPercent : null, // html upload percentage
	hFile : null, // html file picker
	init : () => {
	// (A1) GET HTML ELEMENTS
	uprog.hBar = document.getElementById("up-bar");
	uprog.hPercent = document.getElementById("up-percent");
	uprog.hFile = document.getElementById("up-file");

	// (A2) ATTACH AJAX UPLOAD + ENABLE UPLOAD
	uprog.hFile.onchange = uprog.upload;
	uprog.hFile.disabled = false;
	},

	// (B) HELPER - UPDATE PROGRESS BAR
	update : percent => {
	percent = percent + "%";
	uprog.hBar.style.width = percent;
	uprog.hPercent.innerHTML = percent;
	if (percent == "100%") { uprog.hFile.disabled = false; }
	},

	// (C) PROCESS UPLOAD
	upload : () => {
	// (C1) GET FILE + UPDATE HTML INTERFACE
	let file = uprog.hFile.files[0];
	uprog.hFile.disabled = true; // disable upload button
	uprog.hFile.value = ""; // reset file picker

	// (C2) AJAX UPLOAD
	let xhr = new XMLHttpRequest(),
	data = new FormData();
	data.append("upfile", file);
	xhr.open("POST", "upload.php");

	// (C3) UPLOAD PROGRESS
	let percent = 0, width = 0;
	xhr.upload.onloadstart = evt => uprog.update(0);
	xhr.upload.onloadend = evt => uprog.update(100);
	xhr.upload.onprogress = evt => {
	percent = Math.ceil((evt.loaded / evt.total) * 100);
	uprog.update(percent);
	};

	// (C4) ON LOAD & ERRORS
	xhr.onload = function () {
	if (this.response!= "OK" \|\| this.status!=200) {
	// @TODO - DO SOMETHING ON ERROR
	// alert("ERROR!");
	// reset form?
	console.log(this);
	console.log(this.response);
	console.log(this.status);
	} else {
	uprog.update(100);
	// @TODO - DO SOMETHING ON COMPLETE
	}
	};
	xhr.onerror = err => console.error(err);

	// (C5) GO!
	xhr.send(data);
	}
	};
	window.addEventListener("load", uprog.init);
	<?php
	// (A) MOVE UPLOADED FILE
	$source = $_FILES["upfile"]["tmp_name"];
	$destination = $_FILES["upfile"]["name"];
	move_uploaded_file($source, $destination);

	// (B) RESPONSE
	echo "OK";