feat: add dropzone support to attachFile

When the target element is not an <input type="file">, attachFile now
falls back to dispatching synthetic drag-and-drop events (dragenter,
dragover, drop) with a DataTransfer containing the file. This enables
file uploads to dropzone libraries (Dropzone.js, react-dropzone, etc.).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: DavertMik

docs/webapi/attachFile.mustache

@@ -7,6 +7,13 @@ I.attachFile('Avatar', 'data/avatar.jpg');
 I.attachFile('form input[name=avatar]', 'data/avatar.jpg');
 ```
 
+If the locator points to a non-file-input element (e.g., a dropzone area),
+the file will be dropped onto that element using drag-and-drop events.
+
+```js
+I.attachFile('#dropzone', 'data/avatar.jpg');
+```
+
 @param {CodeceptJS.LocatorOrString} locator field located by label|name|CSS|XPath|strict locator.
 @param {string} pathToFile local file path relative to codecept.conf.ts or codecept.conf.js config file.
 @returns {void} automatically synchronized promise through #recorder

lib/helper/Playwright.js

@@ -26,6 +26,8 @@ import {
   normalizePath,
   resolveUrl,
   relativeDir,
+  getMimeType,
+  base64EncodeFile,
 } from '../utils.js'
 import { isColorProperty, convertColorToRGBA } from '../colorUtils.js'
 import ElementNotFound from './errors/ElementNotFound.js'
@@ -2348,8 +2350,31 @@ class Playwright extends Helper {
       throw new Error(`File at ${file} can not be found on local system`)
     }
     const els = await findFields.call(this, locator)
-    assertElementExists(els, locator, 'Field')
-    await els[0].setInputFiles(file)
+    if (els.length) {
+      const tag = await els[0].evaluate(el => el.tagName)
+      const type = await els[0].evaluate(el => el.type)
+      if (tag === 'INPUT' && type === 'file') {
+        await els[0].setInputFiles(file)
+        return this._waitForAction()
+      }
+    }
+
+    const targetEls = els.length ? els : await this._locate(locator)
+    assertElementExists(targetEls, locator, 'Element')
+    const base64Content = base64EncodeFile(file)
+    const fileName = path.basename(file)
+    const mimeType = getMimeType(fileName)
+    await targetEls[0].evaluate((el, { base64Content, fileName, mimeType }) => {
+      const binaryStr = atob(base64Content)
+      const bytes = new Uint8Array(binaryStr.length)
+      for (let i = 0; i < binaryStr.length; i++) bytes[i] = binaryStr.charCodeAt(i)
+      const fileObj = new File([bytes], fileName, { type: mimeType })
+      const dataTransfer = new DataTransfer()
+      dataTransfer.items.add(fileObj)
+      el.dispatchEvent(new DragEvent('dragenter', { dataTransfer, bubbles: true }))
+      el.dispatchEvent(new DragEvent('dragover', { dataTransfer, bubbles: true }))
+      el.dispatchEvent(new DragEvent('drop', { dataTransfer, bubbles: true }))
+    }, { base64Content, fileName, mimeType })
     return this._waitForAction()
   }
 

lib/helper/Puppeteer.js

@@ -28,6 +28,8 @@ import {
   normalizeSpacesInString,
   normalizePath,
   resolveUrl,
+  getMimeType,
+  base64EncodeFile,
 } from '../utils.js'
 import { isColorProperty, convertColorToRGBA } from '../colorUtils.js'
 import ElementNotFound from './errors/ElementNotFound.js'
@@ -1626,8 +1628,31 @@ class Puppeteer extends Helper {
       throw new Error(`File at ${file} can not be found on local system`)
     }
     const els = await findFields.call(this, locator)
-    assertElementExists(els, locator, 'Field')
-    await els[0].uploadFile(file)
+    if (els.length) {
+      const tag = await els[0].evaluate(el => el.tagName)
+      const type = await els[0].evaluate(el => el.type)
+      if (tag === 'INPUT' && type === 'file') {
+        await els[0].uploadFile(file)
+        return this._waitForAction()
+      }
+    }
+
+    const targetEls = els.length ? els : await this._locate(locator)
+    assertElementExists(targetEls, locator, 'Element')
+    const base64Content = base64EncodeFile(file)
+    const fileName = path.basename(file)
+    const mimeType = getMimeType(fileName)
+    await targetEls[0].evaluate((el, { base64Content, fileName, mimeType }) => {
+      const binaryStr = atob(base64Content)
+      const bytes = new Uint8Array(binaryStr.length)
+      for (let i = 0; i < binaryStr.length; i++) bytes[i] = binaryStr.charCodeAt(i)
+      const fileObj = new File([bytes], fileName, { type: mimeType })
+      const dataTransfer = new DataTransfer()
+      dataTransfer.items.add(fileObj)
+      el.dispatchEvent(new DragEvent('dragenter', { dataTransfer, bubbles: true }))
+      el.dispatchEvent(new DragEvent('dragover', { dataTransfer, bubbles: true }))
+      el.dispatchEvent(new DragEvent('drop', { dataTransfer, bubbles: true }))
+    }, { base64Content, fileName, mimeType })
     return this._waitForAction()
   }
 

lib/helper/WebDriver.js

@@ -1,5 +1,6 @@
 let webdriverio
 
+import fs from 'fs'
 import assert from 'assert'
 import path from 'path'
 import crypto from 'crypto'
@@ -24,6 +25,8 @@ import {
   modifierKeys,
   normalizePath,
   resolveUrl,
+  getMimeType,
+  base64EncodeFile,
 } from '../utils.js'
 import { isColorProperty, convertColorToRGBA } from '../colorUtils.js'
 import ElementNotFound from './errors/ElementNotFound.js'
@@ -1352,20 +1355,41 @@ class WebDriver extends Helper {
 
     const res = await findFields.call(this, locator)
     this.debug(`Uploading ${file}`)
-    assertElementExists(res, locator, 'File field')
-    const el = usingFirstElement(res)
 
-    // Remote Upload (when running Selenium Server)
-    if (this.options.remoteFileUpload) {
-      try {
-        this.debugSection('File', 'Uploading file to remote server')
-        file = await this.browser.uploadFile(file)
-      } catch (err) {
-        throw new Error(`File can't be transferred to remote server. Set \`remoteFileUpload: false\` in config to upload file locally.\n${err.message}`)
+    if (res.length) {
+      const el = usingFirstElement(res)
+      const tag = await this.browser.execute(function (elem) { return elem.tagName }, el)
+      const type = await this.browser.execute(function (elem) { return elem.type }, el)
+      if (tag === 'INPUT' && type === 'file') {
+        if (this.options.remoteFileUpload) {
+          try {
+            this.debugSection('File', 'Uploading file to remote server')
+            file = await this.browser.uploadFile(file)
+          } catch (err) {
+            throw new Error(`File can't be transferred to remote server. Set \`remoteFileUpload: false\` in config to upload file locally.\n${err.message}`)
+          }
+        }
+        return el.addValue(file)
       }
     }
 
-    return el.addValue(file)
+    const targetRes = res.length ? res : await this._locate(locator)
+    assertElementExists(targetRes, locator, 'Element')
+    const targetEl = usingFirstElement(targetRes)
+    const base64Content = base64EncodeFile(file)
+    const fileName = path.basename(file)
+    const mimeType = getMimeType(fileName)
+    return this.browser.execute(function (el, base64Content, fileName, mimeType) {
+      var binaryStr = atob(base64Content)
+      var bytes = new Uint8Array(binaryStr.length)
+      for (var i = 0; i < binaryStr.length; i++) bytes[i] = binaryStr.charCodeAt(i)
+      var fileObj = new File([bytes], fileName, { type: mimeType })
+      var dataTransfer = new DataTransfer()
+      dataTransfer.items.add(fileObj)
+      el.dispatchEvent(new DragEvent('dragenter', { dataTransfer: dataTransfer, bubbles: true }))
+      el.dispatchEvent(new DragEvent('dragover', { dataTransfer: dataTransfer, bubbles: true }))
+      el.dispatchEvent(new DragEvent('drop', { dataTransfer: dataTransfer, bubbles: true }))
+    }, targetEl, base64Content, fileName, mimeType)
   }
 
   /**

lib/utils.js

@@ -658,6 +658,36 @@ export const base64EncodeFile = function (filePath) {
   return Buffer.from(fs.readFileSync(filePath)).toString('base64')
 }
 
+export const getMimeType = function (fileName) {
+  const ext = path.extname(fileName).toLowerCase()
+  const mimeTypes = {
+    '.jpg': 'image/jpeg',
+    '.jpeg': 'image/jpeg',
+    '.png': 'image/png',
+    '.gif': 'image/gif',
+    '.bmp': 'image/bmp',
+    '.svg': 'image/svg+xml',
+    '.webp': 'image/webp',
+    '.pdf': 'application/pdf',
+    '.txt': 'text/plain',
+    '.html': 'text/html',
+    '.css': 'text/css',
+    '.js': 'application/javascript',
+    '.json': 'application/json',
+    '.xml': 'application/xml',
+    '.zip': 'application/zip',
+    '.csv': 'text/csv',
+    '.doc': 'application/msword',
+    '.docx': 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+    '.xls': 'application/vnd.ms-excel',
+    '.xlsx': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+    '.mp3': 'audio/mpeg',
+    '.mp4': 'video/mp4',
+    '.wav': 'audio/wav',
+  }
+  return mimeTypes[ext] || 'application/octet-stream'
+}
+
 export const markdownToAnsi = function (markdown) {
   return (
     markdown

test/data/app/view/form/dropzone.php

@@ -0,0 +1,24 @@
+<html><body>
+<div id="droparea" style="width:300px;height:200px;border:2px dashed #ccc;padding:20px;">
+  <p id="status">Drop files here</p>
+</div>
+<div id="file-list"></div>
+<script>
+  var droparea = document.getElementById('droparea');
+  droparea.addEventListener('dragenter', function(e) { e.preventDefault(); });
+  droparea.addEventListener('dragover', function(e) { e.preventDefault(); });
+  droparea.addEventListener('drop', function(e) {
+    e.preventDefault();
+    var files = e.dataTransfer.files;
+    document.getElementById('status').textContent = 'Dropped ' + files.length + ' file(s)';
+    var list = document.getElementById('file-list');
+    list.innerHTML = '';
+    for (var i = 0; i < files.length; i++) {
+      var div = document.createElement('div');
+      div.className = 'file-info';
+      div.textContent = files[i].name + ' - ' + files[i].type + ' - ' + files[i].size;
+      list.appendChild(div);
+    }
+  });
+</script>
+</body></html>

test/helper/webapi.js

@@ -1054,6 +1054,19 @@ export function tests() {
       expect(formContents().files.avatar.name).to.eql('avatar.jpg')
       expect(formContents().files.avatar.type).to.eql('image/jpeg')
     })
+
+    it('should drop file to dropzone', async () => {
+      await I.amOnPage('/form/dropzone')
+      await I.attachFile('#droparea', 'app/avatar.jpg')
+      await I.see('Dropped 1 file(s)')
+      await I.see('avatar.jpg')
+    })
+
+    it('should see correct file type after drop', async () => {
+      await I.amOnPage('/form/dropzone')
+      await I.attachFile('#droparea', 'app/avatar.jpg')
+      await I.see('image/jpeg')
+    })
   })
 
   describe('#saveScreenshot', () => {