Cart Licenses Contact Support Online Creator Login/Register
Try
Free
v 1.9.37

File question - custom preview


                        
        
            Survey.StylesManager.applyTheme("modern");
        



                
                    var json = {
  "elements": [
    {
      "type": "file",
      "title": "Please upload your files",
      "name": "files",
      "storeDataAsText": false,
      "allowMultiple": true,
      "showPreview": false,
      "maxSize": 102400
    }
  ]
};

                    window.survey = new Survey.Model(json);
                
        
            survey.onComplete.add(function(sender) {
            document.querySelector('#surveyResult').textContent =
            "Result JSON:\n" + JSON.stringify(sender.data, null, 3);
            });
        
function updatePreview(newValue, container) {
    container.innerHTML = "";
    (newValue || []).forEach(function(fileItem) {
        var button = document.createElement("div");
        button.className = "btn sv-btn sv-file__choose-btn sd-btn sd-btn--action";
        button.innerText = "Download " + fileItem.name;
        button.onclick = function() {
            alert(JSON.stringify(fileItem));
        }
        container.appendChild(button);
    });
}

survey
.onAfterRenderQuestion
.add(function (sender, options) {
    if(options.question.getType() === "file") {
        var container = document.createElement("div");
        container.className = "my-preview-container";
        var fileElement = options.htmlElement.getElementsByClassName("sv_q_file")[0];
        if(!fileElement) {
            fileElement = options.htmlElement.getElementsByClassName("sv-file__decorator")[0];
        }
        if (!fileElement) {
            fileElement = options.htmlElement.getElementsByClassName("sd-file__decorator")[0];
        }
        fileElement.appendChild(container);
        options.question.onPropertyChanged.add(function(question, options) {
            if(options.name === "value") {
                updatePreview(options.newValue, container);
            }
        });
        updatePreview(options.question.value, container);
    }
});


survey
.onUploadFiles
.add(function(survey, options) {
    var formData = new FormData();
    options
        .files
        .forEach(function (file) {
            formData.append(file.name, file);
        });
    var xhr = new XMLHttpRequest();
    xhr.open("POST", "https://api.surveyjs.io/private/Surveys/uploadFiles?accessKey=<your_access_key>");
    xhr.onload = function () {
         var data = JSON.parse(xhr.responseText);
         options.callback("success", options.files.map(function(file) {
            return {
                file: file,
                content: data[file.name]
            };
        }));
    };
    xhr.send(formData);
});

function detectIEOrEdge() {
    var ua = window.navigator.userAgent;
    var msie = ua.indexOf("MSIE ");
    var trident = ua.indexOf("Trident/");
    var edge = ua.indexOf("Edge/");
    return edge > 0 || trident > 0 || msie > 0;
}

survey
.onDownloadFile
.add(function(survey, options) {
    alert("Download called");
    var xhr = new XMLHttpRequest();
    xhr.open("GET", "https://api.surveyjs.io/private/Surveys/files?name=" + options.content);
    xhr.onloadstart = function(ev) {
        xhr.responseType = "blob";
    }
    xhr.onload = function () {
        var file;
        if (detectIEOrEdge()){
            file = new Blob([xhr.response], options.fileValue.name, { type: options.fileValue.type });
        }
        else {
            file = new File([xhr.response], options.fileValue.name, { type: options.fileValue.type });
        }
        var reader = new FileReader();
        reader.onload = function(e) {
            options.callback("success", e.target.result);
        };
        reader.readAsDataURL(file);
    };
    xhr.send();
});


survey.data = {"files":[{"name":"TestTemplate.rtf","type":"","content":"00000000-0000-0000-0000-000000000000"},{"name":"pic_e1f5e6f901fe2fb17f78b7cfed600950.jpg","type":"image/jpeg","content":"00000000-0000-0000-0000-000000000000"}]};
            
                survey.render("surveyElement");
            

                    
<!DOCTYPE html>
<html lang="en">
<head>
    <title>File question - custom preview, Knockoutjs Survey Library Example</title>
    
<meta name="viewport" content="width=device-width" />
    <script src="https://unpkg.com/knockout@3.5.1/build/output/knockout-latest.js"></script>
    <script src="/DevBuilds/survey-core/survey.core.min.js"></script>
    <script src="/DevBuilds/survey-core/survey.i18n.min.js"></script>
    <script src="/DevBuilds/survey-knockout-ui/survey-knockout-ui.min.js"></script>
    <link href="/DevBuilds/survey-core/modern.min.css" type="text/css" rel="stylesheet" />
    <link rel="stylesheet" href="./index.css">

</head>
<body style="margin: 0">
    
            <div id="surveyElement" style="display:inline-block;width:100%;">
            </div>
    <div id="surveyResult"></div>

<script type="text/javascript" src="./index.js"></script>

</body>
</html>

.my-preview-container {
    margin-top: 2em;
}

.my-preview-container .sv-file__choose-btn {
    margin: 0 1em;
}

.sd-file__decorator .my-preview-container {
    position: absolute;
    bottom: 0;
}

.sd-file__decorator .sv-file__choose-btn {
    display: flex;
    max-width: 500px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.btn {
    border: 1px solid lightgray;
    cursor: pointer;
    padding: 4px 8px;
    display: inline-block;
}
Dismiss

Tell us what you think

Help us serve you better by taking this brief
survey. We are interested to learn more about
your experience of using our libraries.

We'd really appreciate your feedback.

Approximate time to complete: 2 min.

Start the survey