You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: elements.go
    path of file: ./repos/ponzu/management/editor
    
    the code of the file until where you have to start completion: package editor

import (
	"bytes"
	"html"
	"strings"
)

// Input returns the []byte of an <input> HTML element with a label.
// IMPORTANT:
// The `fieldName` argument will cause a panic if it is not exactly the string
// form of the struct field that this editor input is representing
// 	type Person struct {
//		item.Item
// 		editor editor.Editor
//
// 		Name string `json:"name"`
//		//...
// 	}
//
// 	func (p *Person) MarshalEditor() ([]byte, error) {
// 		view, err := editor.Form(p,
// 			editor.Field{
// 				View: editor.Input("Name", p, map[string]string{
// 					"label":       "Name",
// 					"type":        "text",
// 					"placeholder": "Enter the Name here",
// 				}),
// 			}
// 		)
// 	}
func Input(fieldName string, p interface{}, attrs map[string]string) []byte {
	e := NewElement("input", attrs["label"], fieldName, p, attrs)

	return DOMElementSelfClose(e)
}

// Textarea returns the []byte of a <textarea> HTML element with a label.
// IMPORTANT:
// The `fieldName` argument will cause a panic if it is not exactly the string
// form of the struct field that this editor input is representing
func Textarea(fieldName string, p interface{}, attrs map[string]string) []byte {
	// add materialize css class to make UI correct
	className := "materialize-textarea"
	if _, ok := attrs["class"]; ok {
		class := attrs["class"]
		attrs["class"] = class + " " + className
	} else {
		attrs["class"] = className
	}

	e := NewElement("textarea", attrs["label"], fieldName, p, attrs)

	return DOMElement(e)
}

// Timestamp returns the []byte of an <input> HTML element with a label.
// IMPORTANT:
// The `fieldName` argument will cause a panic if it is not exactly the string
// form of the struct field that this editor input is representing
func Timestamp(fieldName string, p interface{}, attrs map[string]string) []byte {
	var data string
	val := ValueFromStructField(fieldName, p)
	if val == "0" {
		data = ""
	} else {
		data = val
	}

	e := &Element{
		TagName: "input",
		Attrs:   attrs,
		Name:    TagNameFromStructField(fieldName, p),
		Label:   attrs["label"],
		Data:    data,
		ViewBuf: &bytes.Buffer{},
	}

	return DOMElementSelfClose(e)
}

// File returns the []byte of a <input type="file"> HTML element with a label.
// IMPORTANT:
// The `fieldName` argument will cause a panic if it is not exactly the string
// form of the struct field that this editor input is representing
func File(fieldName string, p interface{}, attrs map[string]string) []byte {
	name := TagNameFromStructField(fieldName, p)
	value := ValueFromStructField(fieldName, p)
	tmpl :=
		`<div class="file-input ` + name + ` input-field col s12">
			<label class="active">` + attrs["label"] + `</label>
			<div class="file-field input-field">
				
    
func Richtext(fieldName string, p interface{}, attrs map[string]string) []byte {
	// create wrapper for richtext editor, which isolates the editor's css
	iso := []byte(`<div class="iso-texteditor input-field col s12"><label>` + attrs["label"] + `</label>`)
	isoClose := []byte(`</div>`)

	if _, ok := attrs["class"]; ok {
		attrs["class"] += "richtext " + fieldName
	} else {
		attrs["class"] = "richtext " + fieldName
	}

	if _, ok := attrs["id"]; ok {
		attrs["id"] += "richtext-" + fieldName
	} else {
		attrs["id"] = "richtext-" + fieldName
	}

	// create the target element for the editor to attach itself
	div := &Element{
		TagName: "div",
		Attrs:   attrs,
		Name:    "",
		Label:   "",
		Data:    "",
		ViewBuf: &bytes.Buffer{},
	}

	// create a hidden input to store the value from the struct
	val := ValueFromStructField(fieldName, p)
	name := TagNameFromStructField(fieldName, p)
	input := `<input type="hidden" name="` + name + `" class="richtext-value ` + fieldName + `" value="` + html.EscapeString(val) + `"/>`

	// build the dom tree for the entire richtext component
	iso = append(iso, DOMElement(div)...)
	iso = append(iso, []byte(input)...)
	iso = append(iso, isoClose...)

	script := `
	<script>
		$(function() { 
			var _editor = $('.richtext.` + fieldName + `');
			var hidden = $('.richtext-value.` + fieldName + `');

			_editor.materialnote({
				height: 250,
				placeholder: '` + attrs["placeholder"] + `',
				toolbar: [
					['style', ['style']],
					['font', ['bold', 'italic', 'underline', 'clear', 'strikethrough', 'superscript', 'subscript']],
					['fontsize', ['fontsize']],
					['color', ['color']],
					['insert', ['link', 'picture', 'video', 'hr']],					
					['para', ['ul', 'ol', 'paragraph']],
					['table', ['table']],
					['height', ['height']],
					['misc', ['codeview']]
				],
				// intercept file insertion, upload and insert img with new src
				onImageUpload: function(files) {
					var data = new FormData();
					data.append("file", files[0]);
					$.ajax({
						data: data,
						type: 'PUT',	
						url: '/admin/edit/upload',
						cache: false,
						contentType: false,
						processData: false,
						success: function(resp) {
							var img = document.createElement('img');
							img.setAttribute('src', resp.data[0].url);
							_editor.materialnote('insertNode', img);
						},
						error: function(xhr, status, err) {
							console.log(status, err);
						}
					})

				}
			});

			// inject content into editor
			if (hidden.val() !== "") {
				_editor.code(hidden.val());
			}

			// update hidden input with encoded value on different events
			_editor.on('materialnote.change', function(e, content, $editable) {
				hidden.val(replaceBadChars(content));			
			});

			_editor.on('materialnote.paste', function(e) {
				hidden.val(replaceBadChars(_editor.code()));			
			});

			// bit of a hack to stop the editor buttons from causing a refresh when clicked 
			$('.note-toolbar').find('button, i, a').on('click', function(e) { e.preventDefault(); });
		});
	</script>`

	return append(iso, []byte(script)...)
}