config.jelly

<!--
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<?jelly escape-by-default='true'?>
<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:f="/lib/form">
    <f:entry title="${%IconPreview}" help="${descriptor.getHelpFile('upload')}">
        <link rel="stylesheet" href="${rootURL}/plugin/custom-folder-icon/croppie/croppie.css" type="text/css" />
        <script src="${rootURL}/plugin/custom-folder-icon/croppie/croppie.js" type="text/javascript"></script>
        <div id="icon-preview">
            <div id="file-cropper"></div>
            <!-- @size is for other browsers, @style is for IE -->
            <!-- TODO switch to f:file after baseline includes https://github.com/jenkinsci/jenkins/pull/7452 -->
            <input type="file" class="jenkins-file-upload" style="width:80%" size="40" accept="image/*" id="file-input" />
            <st:nbsp />
            <input type="button" value="${%Apply}" id="apply-button" />
        </div>
    </f:entry>
    <f:entry field="foldericon">
        <f:textbox id="file-name" value="${instance.foldericon}" style="display: none" />
    </f:entry>
    <script>
        // init preview url
        var preview = document.getElementById("file-name").getAttribute("value");
        var url;
        if (preview != null &amp;&amp; preview != '') {
            url = "${rootURL}/userContent/customFolderIcons/" + preview;
        } else {
            url = "${rootURL}/plugin/custom-folder-icon/icons/default.png";
        }

        // init croppie
        var croppie = new Croppie(document.getElementById("file-cropper"), {
            viewport: { width: 128, height: 128 },
            boundary: { width: 200, height: 200 },
            enforceBoundary: false,
            url: url
        });

        // read file input
        document.getElementById("file-input").addEventListener("change", function(e) {
            var reader = new FileReader();
            reader.onload = function (ev) {
                croppie.bind({
                    url: ev.target.result
                });
            }
            reader.readAsDataURL(this.files[0]);
        });

        // handle apply
        document.getElementById("apply-button").addEventListener("click", function(e) {
            var request = new XMLHttpRequest();
            request.onreadystatechange = function() {
                if (this.readyState == 4) {
                    if (this.status == 200) {
                        document.getElementById("file-name").setAttribute("value", this.responseText);
                        alert("${%UploadSuccess} " + this.responseText);
                    } else {
                        var error = this.responseText.substring(this.responseText.lastIndexOf("<title>")+7, this.responseText.lastIndexOf("</title>"));
                        alert("${%UploadFailed} " + error);
                    }
                }
            };

            request.open("POST", "${rootURL}/descriptor/jenkins.plugins.foldericon.CustomFolderIcon/uploadIcon");

            // get a crumb
            new Ajax.Request("${rootURL}/crumbIssuer/api/json", {
                method: "GET",
                onSuccess: function(req) {
                    var jsonResponse = JSON.parse(req.transport.response);
                    var header = jsonResponse.crumbRequestField;
                    var value = jsonResponse.crumb;
                    request.setRequestHeader(header, value);
                },
                onComplete: function() {
                    // upload the file
                    var formData = new FormData();
                    croppie.result("blob").then(function(blob) {
                        formData.append("file", blob);
                        request.send(formData);
                    });
                }
            });
        });
    </script>
</j:jelly>