如何使用QWebElement设置input(type ="file")的值？

Question

我正在尝试使用QtWebKit模块将照片上传到vk.com.我面临的问题是无法正确填补价值.这是我使用的一些相关代码:input(type="file")

def upload():
    print 'uploading...'
    photoInput = web.page().mainFrame().documentElement().findFirst('input[id="photos_upload_input"]')
    assert photoInput, 'No input found'
    photoInput.setAttribute('value', '/Users/elmigranto/Downloads/stuff.png')

    print photoInput.evaluateJavaScript('return this.value;').toString()

值得注意的是,由于浏览器安全策略,Javascript无法填写文件输入值.但是,应该可以使用Qt API,更具体地说,使用方法.这就是我所做的......没有效果(好吧,返回预期结果,但返回空字符串,输入的处理程序也不会被触发).QWebElement::setAttribute()photoInput.attribute('value')photoInput.evaluateJavaScript('return this.value;').toString()onchange

设置其他属性没有问题,例如,像魅力一样工作.QWebElement::addClass()

任何帮助都会非常棒.
谢谢.

Answer 1

setAttribute出于安全原因,该方法可能仍然不起作用.

但您可以重新定义QWebPage::chooseFile通常应打开上载对话框并返回文件名的函数,以便在不打开对话框的情况下返回静态文件名,并通过模拟输入元素上的"返回"键来激活该上载.

这似乎有效:

from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtWebKit import *
import sys

class WebPage(QWebPage):
    def __init__(self, parent = None):
        super(WebPage, self).__init__(parent)
        self.overrideUpload = None

    def chooseFile(self, originatingFrame, oldFile):
        if self.overrideUpload is None:
            return super(WebPage, self).chooseFile(originatingFrame, oldFile)
        result = self.overrideUpload
        self.overrideUpload = None
        return result

    def setUploadFile(self, selector, filename):
        button = self.mainFrame().documentElement().findFirst(selector)
        self.overrideUpload = filename
        # set the focus on the input element
        button.setFocus();
        # and simulate a keypress event to make it call our chooseFile method 
        webview.event(QKeyEvent(QEvent.KeyPress, Qt.Key_Enter, Qt.NoModifier))

def upload():
    print 'uploading...'    
    page.setUploadFile('input[id="photos_upload_input"]',
        '/Users/elmigranto/Downloads/stuff.png') 
    # The change seems to be asynchronous, at it isn't visible 
    # just after the previous call

app = QApplication(sys.argv)
webview = QWebView()
page = WebPage(webview)
webview.setPage(page)
source = '''
<form action="#">
  Select a file: <input type="file" id="photos_upload_input">
  <input type="submit">
</form>
'''
webview.loadFinished.connect(upload)
webview.show()
webview.setHtml(source)
sys.exit(app.exec_())