a11ytext/a11ytext.html at master · TimAdamson21/a11ytext · GitHub

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<!DOCTYPE html>
<html lang="en-US">
<head>
    <title>A11yText</title>
    <link rel="icon" href="favicon.ico" type="image/x-icon">
    <meta charset="UTF-8">
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/superagent/3.5.2/superagent.min.js"></script>
    <link rel="stylesheet" type="text/css" href="a11ytext.css">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
	<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
	<style>body {font-size:12pt}</style>
</head>
<body>

    <div class="container-fluid text-center">
  <div class="row content">
    <div class="col-sm-2 sidenav">

		Contrast
		<br>
        <label class="switch">
            <input id ="myCheck" type="checkbox" onclick="changeContrast()">
            <span class="slider round"></span>
        </label>
        <br><br>

        <textarea readonly id="conversionStatus" style="width:100%; height:100px;"></textarea>
    </div>

    <div class="col-sm-8 text-left" style="height: 650px">
      <textarea readonly id="displayText" style="width:100%; height:100%;"></textarea>
  </div>
  <div class="col-sm-2 sidenav">

Print
<label class="switch" name="choose handwriting or printed text">

    <input id ="handwritingCheck" type="checkbox">
    <span class="slider round"></span>
</label>
By Hand<br><br>

Accepts PDFs and images (JPG and PNG).
<br><br>
Multi-page PDFs: only converts first page.
<br><br>
<input type="text" name="inputImage" id="inputImage" value="https://upload.wikimedia.org/wikipedia/commons/thumb/a/af/Atomist_quote_from_Democritus.png/338px-Atomist_quote_from_Democritus.png" />
<button onclick="handleUrl()">Read image</button>
<br><br>
<input type="file" id="input" onchange="handleFile(this.files[0])">
<br><br>
<a download="A11yText.txt" id="downloadLink" style="display: none; font-size:18px">Download</a>


<div id="imageDiv" style="width:150%; display:table-cell;">

    <br><br>
    <img id="sourceImage" width="400" />
</div>
  </div>

</div>
</div>
<h2>Convert PDFs and Images to Text</h2>
</body>

<script type="text/javascript">


	//**********************************************
	// *** Update or verify the subscription keys' string values with your valid subscription keys for each service. ***
	// **********************************************
	var subKey = "21d07175a90e4c06aecad901b631ab4d";

    // Replace or verify the region.
    //
    // You must use the same region in your REST API call as you used to obtain your subscription keys.
    // For example, if you obtained your subscription keys from the westus region, replace
    // "westcentralus" in the URI below with "westus".
    //
    // NOTE: Free trial subscription keys are generated in the westcentralus region, so if you are using
    // a free trial subscription key, you should not need to change this region.
    var uriBase = "https://westcentralus.api.cognitive.microsoft.com/vision/v1.0/";

	/*
	 * changes the contrast back and forth between the text/background being
	 * black/white respectively
	 */
    function changeContrast() {
		var checkBox = document.getElementById("myCheck");
        var textArea = document.getElementById("displayText");
        if(checkBox.checked) {
            textArea.style.backgroundColor = "black";
            textArea.style.color = "white";
        } else {
            textArea.style.backgroundColor = "white";
            textArea.style.color = "black";
        }
    }

	/**
	 * takes text (e.g. from within a textbox)
	 * returns a text file
	 */
    var textFile = null,
    makeTextFile = function (text) {
        var data = new Blob([text], {type: 'text/plain'});
	    if (textFile !== null) {
	    	// revoke previous file's object URL to avoid memory leaks
	    	window.URL.revokeObjectURL(textFile);
	    }
        textFile = window.URL.createObjectURL(data);
        return textFile;
    };

    /**
     * prepares download button by creating the file and making the button visible
     */
    function prepareDownload() {
        var textbox = document.getElementById('displayText');
        var link = document.getElementById('downloadLink');
        link.href = makeTextFile(textbox.value);
        link.style.display = 'block';
    }

    /**
     * takes a data url and a file name
     * returns a file with the given file name
     */
    function dataURLtoFile(dataurl, filename) {
        var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
            bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
        while(n--){
            u8arr[n] = bstr.charCodeAt(n);
        }
        return new File([u8arr], filename, {type:mime});
    }

    /*
     * handles a local file
     * If file is pdf, jpg, or png, process it.
     * Otherwise, if there is a file, alert the user of invalid file
     * Otherwise, ignore it. (case when user opens file input and then cancels it,
     *	 						in which the file is undefined)
     */
   	function handleFile(file) {
   		if (file === undefined) {
   			return;
   		}
   		eraseResult();
        if (file.type === "image/jpeg" || file.type === "image/png") {
            // user uploaded an image

            // set the download attribute to be used when "download" is clicked
            document.getElementById("downloadLink").download = fileToDownloadName(file.name);

            imageToText(file);
        } else if (file.type === "application/pdf") {
            // user uploaded a pdf

            // set the download attribute to be used when "download" is clicked
            document.getElementById("downloadLink").download = fileToDownloadName(file.name);

            pdfToText(file);
        } else {
            alert("Illegal file type for local file.");
        }
    }

    /**
     * handles the urls of PDFs or images
     * If url points to a pdf, jpg, or png, process it.
     * Otherwise, alert the user of invalid file
     */
   	function handleUrl() {
    	eraseResult();
   		var url = document.getElementById("inputImage").value;
   		if (!url.startsWith("http")) {
			// add http to the beginning of the url, for the case
			// where the url is valid except the beginning
			document.getElementById("inputImage").value = "http://" + url;
		}
   		document.getElementById("downloadLink").download = urlToDownloadName(document.getElementById("inputImage").value);
   		if (url.endsWith(".jpg") || url.endsWith(".jpeg") || url.endsWith(".png")) {
   			imageToText(null);
   		} else if (url.endsWith(".pdf")) {
   			pdfToText(null);
   		} else {
   			alert("Illegal file type for online file.");
   		}
   	}

    /**
     * converts a URL into a name for the downloaded text file
     * assumes that the url is valid and points to a PDF, JPG, or PNG
     */
   	function urlToDownloadName(url) {
	  	return url.substring(url.lastIndexOf("/") + 1, url.lastIndexOf(".")) + ".txt";
   	}

   	/**
     * converts a file name into a name for the downloaded text file
     * assumes that the file to which the name belongs is a PDF, JPG, or PNG
     */
   	function fileToDownloadName(fileName) {
	  	return fileName.substring(0, fileName.lastIndexOf(".")) + ".txt";
   	}

   	/**
   	 * takes a PDF, converts it to a JPG, and then processes the JPG into text to eventually display.
   	 * If pdfFile is null, then processes the PDF url in the input text box.
   	 */
   	function pdfToText(pdfFile) {
   		$("#conversionStatus").val("PDF being converted. Please wait.");
        var formData = new FormData();
        if (pdfFile === null) {
        	pdfFile = document.getElementById("inputImage").value;
        } else {
        	formData.append('FileName', pdfFile.name);
        }
        formData.append('File', pdfFile);
        formData.append('JpgQuality', '50');
        formData.append('ImageResolutionH', '200');
        formData.append('ImageResolutionV', '200');

        // only convert the first page, since that's all we are using
        formData.append('PageRange', '1');

        // convert PDF to JPG
        $.ajax({
            url: 'https://v2.convertapi.com/pdf/to/jpg?Secret=cNcz3EUfhq9dTdZc',
            data: formData,
            processData: false,
            contentType: false,
            method: 'POST',
            success: function(data) {
            	// pdf conversion successful, so process the JPG of the first page
            	var urlString = "data:text/plain;base64," + data.Files[0].FileData;
                var file = dataURLtoFile(urlString, pdfFile.name);
                imageToText(file);
            }
        })
        .fail(function(err) {
        	// give error alert, since PDF conversion failed
        	console.log(err);
        	document.getElementById('displayText').value = "";
        	alert("Error converting PDF.");
        })
    }

   	/**
   	 * converts a JPG or PNG into text, and writes the text to the "displayText" textbox.
   	 */
    function imageToText(image) {
    	$("#conversionStatus").val("Converting to text. Please wait 10 seconds.");
    	var contentType;
    	if (image == null) {
    		var sourceImageUrl = document.getElementById("inputImage").value;
    		// display image
    		document.querySelector("#sourceImage").src = sourceImageUrl;

    		image = '{"url": "' + sourceImageUrl + '"}';
    		contentType = "application/json";
    	} else {
    		displaySourceImage(image);
        	contentType = "application/octet-stream";
    	}
    	document.getElementById("sourceImage").style.display = 'block';

        // Request parameters.
        var params;
        var uriAdd;
        var processFunc;
        if (document.getElementById("handwritingCheck").checked) {
        	params = {
                "handwriting": "true",
            };
        	uriAdd = "RecognizeText?";
        	processFunc = handToText;
        } else {
        	params = {
                "language": "unk",
                "detectOrientation ": "true",
            };
        	uriAdd = "ocr?";
        	processFunc = printToText;
        }

        // This operation requrires two REST API calls. One to submit the image for processing,
        // the other to retrieve the text found in the image.
        // Perform the first REST API call to submit the image for processing.

        superagent
            .post(uriBase + uriAdd + $.param(params))

            .set("Content-Type", contentType)

            .set("x-ms-version", "2017-04-17")

            .set("x-ms-blob-type", "BlockBlob")

            .set("x-ms-blob-content-type", image.type)

            .set("Ocp-Apim-Subscription-Key", subKey)

            .send(image)

            .end(processFunc);
    }

   	/**
   	 * To convert printed words to text: takes an error and the resulting text
   	 * If there was an error, alert the user.
   	 * Otherwise, display the text on the screen, prepare for the file download,
   	 * and update the conversion status
   	 */
    function printToText(err, res) {
    	if (err) {
    		alert("Conversion failed\n" + err);
    		return;
    	}
    	var obj = JSON.parse(JSON.stringify(res, null, 2));
    	regions = obj.body.regions;
    	var result = '';
    	for (var a = 0; a < regions.length; a++) {
        	lines = regions[a].lines;
        	for (var i = 0; i < lines.length; i++) {
            	sentence ="";
            	words = lines[i].words;
            	for (var j = 0; j < words.length; j++) {
                	result += words[j].text + " ";
            	}
            	result += '\n';
        	}
    	}
    	document.getElementById("displayText").value = result;
    	prepareDownload();
     	$("#conversionStatus").val("Conversion complete.");
	}

   	/**
   	 * To convert handwriting to text: takes an error and result from first API call.
   	 * If there was an error, alert the user.
   	 * Otherwise, retreive text from second API call, display the text on the screen,
   	 * prepare for the file download, and update the conversion status.
   	 */
    function handToText(err, res) {

                if (err) {

                	alert("Conversion failed.")

                    console.log(err);

                } else {
                    // Note: The response may not be immediately available. Handwriting recognition is an
                    // async operation that can take a variable amount of time depending on the length
                    // of the text you want to recognize. You may need to wait or retry this GET operation.
                    //
                    // Wait ten seconds before making the second REST API call.

                    setTimeout(function () {

                        // The "Operation-Location" in the response contains the URI to retrieve the recognized text.
                        var operationLocation = res.xhr.getResponseHeader("Operation-Location");

                        // Perform the second REST API call and get the response.
                        $.ajax({
                            url: operationLocation,

                            // Request headers.
                            beforeSend: function(jqXHR){
                                jqXHR.setRequestHeader("Content-Type","application/json");
                                jqXHR.setRequestHeader("Ocp-Apim-Subscription-Key", subKey);
                            },

                            type: "GET",
                        })

                            .done(function(data) {
                               	var obj = JSON.parse(JSON.stringify(data, null, 2));
                                var lines = obj.recognitionResult.lines;

                                var result = '';

                                for(var i = 0; i < lines.length; i+=1) {
                                    var line = lines[i];
                                    result += line.text + '\n';
                                }
                               	$("#displayText").val(result);
                               	prepareDownload();
                             	$("#conversionStatus").val("Conversion complete.");
                            })

                            .fail(function(jqXHR, textStatus, errorThrown) {
                                // Display error message.
                                var errorString = (errorThrown === "") ? "Error. " : errorThrown + " (" + jqXHR.status + "): ";
                                errorString += (jqXHR.responseText === "") ? "" : (jQuery.parseJSON(jqXHR.responseText).message) ?
                                    jQuery.parseJSON(jqXHR.responseText).message : jQuery.parseJSON(jqXHR.responseText).error.message;
                                alert(errorString);
                            });
                    }, 10000);
                }
            }

	function eraseResult() {
		document.getElementById("downloadLink").style.display = 'none';
		document.getElementById("sourceImage").style.display = 'none';
		document.getElementById("displayText").value = '';
	}

    /**
     * takes a file (binary)
     * reads and displays it on the "sourceImage" element
     */
    function displaySourceImage(file) {
        var reader = new FileReader();
        reader.onload = function (e) {
            $('#sourceImage')
                .attr('src', e.target.result);
        };
        reader.readAsDataURL(file);
    }
</script>
</html>