Firefox 扩展无法覆盖元素事件

发布于 2024-12-06 18:59:11 字数 497 浏览 4 评论 0原文

我在尝试覆盖表单元素的 onsubmit 事件时遇到问题。我使用 addEventListener 添加监听器没有问题，但对于我的特殊情况，我需要替换 onsubmit，但由于某种原因，当我这样做时，它给了我这个错误：

Error: Component is not available = NS_ERROR_NOT_AVAILABLE

我的代码很简单：

gBrowser.contentDocument.getElementById("theform").onsubmit = function() {
   return false;
};

本质上我想阻止表单提交，但是此代码失败并引发上述错误。使用 addEventListener 返回 false 似乎并没有阻止表单提交。

谢谢。

原文

I'm having trouble trying to override a form element's onsubmit event. I have no problem adding a listener with addEventListener, but for my particular case, I need to replace the onsubmit but for some reason when I do, it gives me this error:

Error: Component is not available = NS_ERROR_NOT_AVAILABLE

My code is simply this:

gBrowser.contentDocument.getElementById("theform").onsubmit = function() {
   return false;
};

Essentially I want to prevent the form from submitting, but this code fails and throws the above error. Using addEventListener to return false doesn't seem to stop the form from submitting.

Thanks.

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