Python 鳗鱼 - Javascript 过早运行

Question

I am trying to learn to use the Python eel library.我正在尝试学习使用 Python 鳗鱼库。 Specifically, I am attempting to call a Python function by clicking a button (that runs a JavaScript function).具体来说，我试图通过单击一个按钮（运行 JavaScript 函数）来调用 Python function。

In my folder I have four files, arranged like this:在我的文件夹中有四个文件，排列如下：

|
+--- main.py
|
+--- web-gui
     |
     +--- index.html
     |
     +--- main.js
     |
     +--- style.css

Here is my main.py :这是我的main.py ：

# Start GUI using eel

import eel

eel.init('web-gui')
eel.start('index.html', size=(1440, 900), block=False)

# Boolean data from javascript (true or false) is given to python

result = eel.js_startPython()()

print('Javascript says hello! Your result is', bool(result))

Here is my main.js :这是我的main.js ：

// Javascript passes data to Python when button is pushed

document.getElementById("data").addEventListener("click", js_startPython);

eel.expose(js_startPython); // Expose this function to Python
function js_startPython() {
    console.log('successful button click')
    return result = true;    
}

And here is my index.html :这是我的index.html ：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Python Decider</title>
    <link rel="stylesheet" href="style.css">
    
</head>
<body>

    <div class="container">
        <div class="text">
            <h1>
                The Python Decider
            </h1>
            <p>
                Have a yes/no question? Click on the button to find out your answer.
            </p>
        </div>
        <div class="button">
            <div class="flex align-midde align-center">
                <a class="button glow-button" href="#" id="data">Click me!</a>
            </div>
        </div>
    </div>
    
    <script type="text/javascript" src="/eel.js"></script>
    <script type="text/javascript" src="main.js"></script>
    
</body>
</html>

I expect that, when I press the button, python console will return this:我希望，当我按下按钮时，python 控制台将返回：

>>> Javascript says hello! Your result is True

My current issue is that the JavaScript code is running without being called.我当前的问题是 JavaScript 代码在未被调用的情况下运行。 Without pressing anything, it displays不按任何东西，它显示

>>> Javascript says hello! Your result is True # before button is even pressed

Sorry about the really long post.很抱歉这篇文章很长。 I appreciate any answers.我感谢任何答案。 I also apologize if this question has already been asked on SO, but I'm pretty sure it hasn't been.如果这个问题已经在 SO 上被问到，我也很抱歉，但我很确定它还没有被问到。

Answer 1

Your understanding of how Eel interacts with JS is wrong.你对 Eel 如何与 JS 交互的理解是错误的。 Currently, your Python code is calling js_startPython() after eel.start() .目前，您的 Python 代码在js_startPython() eel.start() 。 The eel.expose(js_startPython) function exposes the JS function to Python, what you want to do is expose a Python function to your JS, using the decorator functions @eel.expose : eel.expose(js_startPython) function 将 JS function 公开到 Python，您要做的是使用装饰器函数@eel.expose将 Python function 公开到您的 JS：

Python Python

@eel.expose
def py_startJavaScript(result):
    print('Javascript says hello! Your result is', bool(result))

JavaScript JavaScript

document.getElementById("data").addEventListener("click", eel.js_startPython(true));

I also noticed that you have block=False on your eel.start() , which means that eel will stop after that line.我还注意到您的eel.start()上有block=False ，这意味着 eel 将在该行之后停止。 You can avoid that by adding the following underneath:您可以通过在下面添加以下内容来避免这种情况：

while True:
    eel.sleep(10)

Python 鳗鱼 - Javascript 过早运行

问题描述

1 个解决方案

解决方案1
0 已采纳 2020-11-02 10:39:33

Python 鳗鱼 - Javascript 过早运行

问题描述

1 个解决方案

解决方案1 0 已采纳 2020-11-02 10:39:33

解决方案1
0 已采纳 2020-11-02 10:39:33