halpha/viewer.html at main · observethesun/halpha · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>H-alpha viewer</title>

    <style>
        body {
        	font-family: 'Segoe UI', sans-serif;
          margin: 0;
          padding: 20px;
          background: linear-gradient(135deg, #0f0c1f 0%, #202b60 50%, #0f0c1f 100%);
          min-height: 100vh;
          color: #e0e0e0;
        }

        .container {
          margin: 0 auto;
          background: #1a1a2f;
          border-radius: 20px;
          padding: 10px;
          box-shadow: 0 20px 60px rgba(0,0,0,0.5);
          border: 1px solid rgba(255,255,255,0.1);
        }

        h1 {
        	text-align: center;
        }

        .main-content {
          width: 60vw;
          margin: 0 auto;
        }

        .image-container {
        	text-align: center;
        }

        .image {
        	width: 90%;
        	height: 90%;
        	object-fit: contain;
        }

        .center {
        	width: 100%;
        	text-align: center;
        }

        .search {
        	float: left;
        }

        .navigation {
        	float: right;
        }

    </style>
</head>
<body>

    <div class="container">
      <h1>Sacramento Peak H-alpha Dataset Viewer</h1>
      <div class="main-content">

      	<h3>Upload a csv file with metadata</h3>
	      <input type="file" id="file-input" />
	      <div id="file-message"></div>
	      <div style="height: 5px;"></div>

	      <h3>Search image by date and time</h3>
	      <div class='search'>
					<input type="date"
					  id="date-picker"
					  value="1966-03-13"
					  min="1966-01-01"
					  max="2002-12-31" />
					<input type="time"
						id="time-picker"
						value="00:00:00" />
					<button name="submit" onClick="handleSearch()">Search</button>
				</div>

				<div class='navigation'>
					<button name="button-prev" onClick="handlePrev()">Prev</button>
					<button name="button-next" onClick="handleNext()">Next</button>
				</div>

				<div style="height: 5px; clear: both"></div>

				<div class='image-container'>
					<div id="img-message" style="white-space: pre;"></div>
        	<img id='sun-image' class='image'>
        </div>

        <div class='center'>
	        <a href="" id='fits-link' target="_blank" download>
	        	<button type="button">
	        		Get FITS file
	        	</button>
	      	</a>
        </div>

	      <div style="text-align: right;">Authors: E. Illarionov, A. Pevtsov. 2026.</div>

        </div>

    </div>

    <script>
    	const linkTemplate = "https://nispdata.nso.edu/ftp/flare_patrol_h_alpha_sp/jpg/DIR/FILENAME.jpg"

    	const fitsTemplate = "https://nispdata.nso.edu/ftp/flare_patrol_h_alpha_sp/fts/DIR/FILENAME.fts.gz"

    	const fileInput = document.getElementById("file-input");

    	let fileNames = []
    	let fileDates = []

    	var filePos = null

    	function updateImg(filePos) {
    		const fname = fileNames[filePos]
    		const dir = Number(fname.split('_')[1])
    		const linkShow = linkTemplate.replace('FILENAME', fname).replace('DIR', dir)
    		const linkFits = fitsTemplate.replace('FILENAME', fname).replace('DIR', dir)

    		document.getElementById("sun-image").src=linkShow;
    		document.getElementById("fits-link").href=linkFits;

    		const name = fileNames[filePos]
    		const date = fileDates[filePos]

    		var text = ""
    		if (date !== null) {
	    		const year = date.toLocaleString('default', { year: 'numeric' })
	    	  const	month = date.toLocaleString('default', { month: 'short' })
	    		const day = date.toLocaleString('default', { day: 'numeric' })
	    		const time = date.toLocaleTimeString('default', { hour12: false})
	    		text = `File: ${name}    Date: ${day} ${month} ${year}    Time: ${time}`
	    	}
	    	else {
	    		text = `File: ${name} Date: Unknown Time: Unknown`
	    	}

    		showMessage("img-message", text)
    	}

    	function handleNext() {
    		filePos = filePos == fileNames.length-1 ? fileNames.length-1 : filePos+1
    		updateImg(filePos)
    	}

    	function handlePrev() {
    		filePos = filePos == 0 ? 0 : filePos-1
    		updateImg(filePos)
    	}


		function handleSearch() {
			const findDate = new Date(document.querySelector('input[type="date"]').value);
			const time = document.querySelector('input[type="time"]').value.split(":")
			findDate.setHours(time[0])
			findDate.setMinutes(time[1])
			findDate.setSeconds(time[2])

			var currDiff = 0;
			var bestDiff = -(new Date(0,0,0)).valueOf();

			for(i = 0; i < fileDates.length; ++i) {
				if (fileDates[i] === null) { continue }
				currDiff = Math.abs(fileDates[i] - findDate);
			  if (currDiff < bestDiff) {
			    filePos = i;
			    bestDiff = currDiff;
			  }
			}

			updateImg(filePos)
		}

		fileInput.addEventListener("change", handleFileSelection);

		function strParser(row) {
			const items = row.split(',')
			if ( items.length < 2 ) { return }

			const dateStart = 0
			const year = items[1].slice(dateStart, dateStart+4)
			const month = items[1].slice(dateStart+4,dateStart+6)
			const day = items[1].slice(dateStart+6,dateStart+8)
			const hour = items[1].slice(dateStart+9,dateStart+11)
			const minutes = items[1].slice(dateStart+11,dateStart+13)
			const seconds = items[1].slice(dateStart+13,dateStart+15)

			const invalidDate = (year == '9999' || month == '99' || day == '99' ||
				hour == '99' || minutes == '99' || seconds == '99')

			const date = invalidDate ? null : new Date(year,
				Number(month)-1, day, hour, minutes, seconds)

			fileNames.push(items[0].split(".")[0])
			fileDates.push(date)
		}

		function handleFileSelection(event) {
		  const file = event.target.files[0];
		  showMessage("file-message", "")

		  if (!file) {
		    showMessage("file-message", "No file selected. Please choose a file.", "error");
		    return;
		  }

		  if (file.name.split('.').pop().toLowerCase() !== 'csv') {
		    showMessage("file-message", "Unsupported file type. Please select a CSV file.", "error");
		    return;
		  }

		  showMessage("file-message", "Loading file, please wait...");

		  const reader = new FileReader();
		  reader.onload = () => {
		  	const rows = reader.result.split('\n')
		  	rows.shift()

		  	fileNames = []
		  	fileDates = []

		  	rows.map(item => strParser(item))

		  	const text = `File loaded. Total images: ${fileDates.length}. Complete dates: ${fileDates.filter(x => x !== null).length}`

		    showMessage("file-message", text);

		    filePos = fileDates.findIndex(x => x)
		    if (!filePos) { filePos = 0 }

		    updateImg(filePos)
		  };

		  reader.onerror = () => {
		    showMessage("file-message", "Error reading the file. Please try again.", "error");
		  };

		  reader.readAsText(file);
		}

		function showMessage(id, message, type) {
			textField = document.getElementById(id)
		  textField.textContent = message;
		  if (type === "error") { textField.style.color = 'red'}
		  else { textField.style.color = '#e0e0e0'}
		}

    </script>
</body>
</html>