node-red/packages/node_modules/@node-red/nodes/core/function/80-template.html

<script type="text/html" data-template-name="template">
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"></i> <span data-i18n="common.label.name"></span></label>
        <div style="display: inline-block; width: calc(100% - 105px)"><input type="text" id="node-input-name" data-i18n="[placeholder]common.label.name"></div>
    </div>
    <div class="form-row">
        <label for="node-input-field"><i class="fa fa-ellipsis-h"></i> <span data-i18n="template.label.property"></span></label>
        <input type="text" id="node-input-field" placeholder="payload" style="width:250px;">
        <input type="hidden" id="node-input-fieldType">
    </div>
    <div class="form-row" style="position: relative; margin-bottom: 0px;">
        <label for="node-input-template"><i class="fa fa-file-code-o"></i> <span data-i18n="template.label.template"></span></label>
        <input type="hidden" id="node-input-template" autofocus="autofocus">
        <div style="position: absolute; right:0;display:inline-block; text-align: right; font-size: 0.8em;">
            <span data-i18n="template.label.format"></span>:
            <select id="node-input-format" style="width:110px; font-size: 10px !important;  height: 24px; padding:0;">
                <option value="handlebars">mustache</option>
                <option value="html">HTML</option>
                <option value="json">JSON</option>
                <option value="javascript">JavaScript</option>
                <option value="css">CSS</option>
                <option value="markdown">Markdown</option>
                <option value="python">Python</option>
                <option value="sql">SQL</option>
                <option value="yaml">YAML</option>
                <option value="text" data-i18n="template.label.none"></option>
            </select>
            <button id="node-template-expand-editor" class="red-ui-button red-ui-button-small"><i class="fa fa-expand"></i></button>
        </div>
    </div>
    <div class="form-row node-text-editor-row">
        <div style="height: 250px; min-height:150px;" class="node-text-editor" id="node-input-template-editor" ></div>
    </div>
    <div class="form-row">
        <label for="node-input-syntax"><i class="fa fa-code"></i> <span data-i18n="template.label.syntax"></span></label>
        <select id="node-input-syntax" style="width:180px;">
            <option value="mustache" data-i18n="template.label.mustache"></option>
            <option value="plain" data-i18n="template.label.plain"></option>
        </select>
    </div>
    <div class="form-row">
        <label for="node-input-output"><i class="fa fa-long-arrow-right"></i> <span data-i18n="template.label.output"></span></label>
        <select id="node-input-output" style="width:180px;">
            <option value="str" data-i18n="template.label.plain"></option>
            <option value="json" data-i18n="template.label.json"></option>
            <option value="yaml" data-i18n="template.label.yaml"></option>
        </select>
    </div>

</script>

<script type="text/javascript">
    RED.nodes.registerType('template',{
        color:"rgb(243, 181, 103)",
        category: 'function',
        defaults: {
            name: {value:""},
            field: {value:"payload",
                    label:"payload",
                    validate:RED.validators.typedInput("fieldType", false)},
            fieldType: {value:"msg"},
            format: {value:"handlebars"},
            syntax: {value:"mustache"},
            template: {value:"This is the payload: {{payload}} !"},
            output: {value:"str"}
        },
        inputs:1,
        outputs:1,
        icon: "template.svg",
        label: function() {
            return this.name||this._("template.template");;
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        },
        oneditprepare: function() {
            const that = this;
            const stateId = RED.editor.generateViewStateId("node", this, "");
            if (!this.field) {
                this.field = 'payload';
                $("#node-input-field").val("payload");
            }
            if (!this.fieldType) {
                this.fieldType = 'msg';
            }
            if (!this.syntax) {
                this.syntax = 'mustache';
                $("#node-input-syntax").val(this.syntax);
            }
            $("#node-input-field").typedInput({
                default: 'msg',
                types: ['msg','flow','global'],
                typeField: $("#node-input-fieldType")
            });
            this.editor = RED.editor.createEditor({
                id: 'node-input-template-editor',
                mode: 'ace/mode/html',
                stateId: stateId,
                value: $("#node-input-template").val()
            });
            RED.library.create({
                url:"templates", // where to get the data from
                type:"template", // the type of object the library is for
                editor:that.editor, // the field name the main text body goes to
                fields:['name','format','output','syntax'],
                ext: "txt"
            });

            $("#node-input-format").on("change", function() {
                var mod = "ace/mode/"+$("#node-input-format").val();
                that.editor.getSession().setMode({
                    path: mod,
                    v: Date.now()
                });
            });
            RED.popover.tooltip($("#node-template-expand-editor"), RED._("node-red:common.label.expand"));
            $("#node-template-expand-editor").on("click", function (e) {
                e.preventDefault();
                const value = that.editor.getValue();
                that.editor.saveView();
                RED.editor.editText({
                    mode: $("#node-input-format").val(),
                    value: value,
                    stateId: stateId,
                    width: "Infinity",
                    focus: true,
                    complete: function (v, cursor) {
                        that.editor.setValue(v, -1);
                        setTimeout(function () {
                            that.editor.restoreView();
                            that.editor.focus();
                        }, 250);
                    }
                })
            })
        },
        oneditsave: function() {
            $("#node-input-template").val(this.editor.getValue());
            this.editor.destroy();
            delete this.editor;
        },
        oneditcancel: function() {
            this.editor.destroy();
            delete this.editor;
        },
        oneditresize: function(size) {
            var rows = $("#dialog-form>div:not(.node-text-editor-row)");
            var height = $("#dialog-form").height();
            for (var i=0; i<rows.length; i++) {
                height -= $(rows[i]).outerHeight(true);
            }
            var editorRow = $("#dialog-form>div.node-text-editor-row");
            height -= (parseInt(editorRow.css("marginTop"))+parseInt(editorRow.css("marginBottom")));
            $(".node-text-editor").css("height",height+"px");
            this.editor.resize();
        }
    });
</script>