使用许多相同形式的提交按钮 [英] use many submit buttons in the same form

问题描述

我无法访问框架中的所有按钮.它仅适用于直方图"按钮.这是我要在Post方法中访问它的表单.

I cannot access all the buttons from the frame. It is works only with the Histogram button.Here is my form which I want to access it in the Post method.

 <form id="package_form" action="" method="post">
      <div class="panel-body">
          <input type ="submit" name="Download" value="Download">
      </div>
      <div class="panel-body">
          <input type ="submit" name="Histogram" value="Histogram">
      </div>
      <div class="panel-body">
           <input type ="submit" name="Search" value="Search">
      </div>

 </form>

这是我的python代码.

Here is my python code.

 if request.method == 'GET':
        return render_template("preview.html", link=link1)
    elif request.method == 'POST':
        if request.form['Histogram'] == 'Histogram':
            gray_img = cv2.imread(link2,cv2.IMREAD_GRAYSCALE)
            cv2.imshow('GoldenGate', gray_img)
            hist = cv2.calcHist([gray_img], [0], None, [256], [0, 256])
            plt.hist(gray_img.ravel(), 256, [0, 256])
            plt.xlabel('Pixel Intensity Values')
            plt.ylabel('Frequency')
            plt.title('Histogram for gray scale picture')
            plt.show()
            return render_template("preview.html", link=link1)

        elif request.form.get['Download'] == 'Download':
            response = make_response(link2)
            response.headers["Content-Disposition"] = "attachment; filename=link.txt"
            return response
        elif request.form.get['Search'] == 'Search':
            return link1

我做错了什么?

推荐答案

它无法按您编写的方式工作.只有您发送的提交按钮才会包含在 request.form 中，如果您尝试使用其他按钮之一的名称，则会收到错误消息.

It won't work the way you've written it. Only the submit button you send will be included in request.form, you'll get an error if you try to use the name of one of the other buttons.

此外， request.form.get 是一个函数，而不是字典.您可以使用 request.form.get("Histogram")-如果使用了 Histogram 按钮，它将返回 Histogram 按钮的值，否则将返回无.

Also, request.form.get is a function, not a dictionary. You can use request.form.get("Histogram") -- this will return the value of the Histogram button if it was used, otherwise it will return None.

不要使用不同的名称来命名按钮，而应使用相同的名称但使用不同的值.

Instead of giving the buttons different names, use the same name but different values.

<form id="package_form" action="" method="post">
      <div class="panel-body">
          <input type ="submit" name="action" value="Download">
      </div>
      <div class="panel-body">
          <input type ="submit" name="action" value="Histogram">
      </div>
      <div class="panel-body">
          <input type ="submit" name="action" value="Search">
      </div>

 </form>

然后您的Python代码可以是:

Then your Python code can be:

if request.form.action == 'Download':
    ...
elif request.form.action == 'Histogram':
    ...
elif request.form.action == 'Search':
    ...
else:
    ... // Report bad parameter

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