Hacktoberfest 2026：维护者为十月标记出来的 issue，仍然开放、适合新手。 浏览 Hacktoberfest issue

[BUG] Clientside callbacks with the same input and no outputs override each other

未关闭
#3,596 0 条评论 0 个 reaction 已指派 1 人 在 GitHub 查看

@T4rk1n 已经在做这个了。

开始于 2026年2月4日。

评估

这个 Issue 还没有评估数据。

描述

Environment

pip list | grep dash output:

dash                      3.3.0
dash_ag_grid              33.3.3
dash-bootstrap-components 2.0.4
dash_cytoscape            1.0.2
  • OS: Ubuntu 22.04.5
  • Browser: Firefox 147.0.2

Bug description

See example code below. Clicking the button should show "one" and "two" in the developer console (I am not sure if there is a specified order in which they are expected to show up; however, I don't really mind as long as both callbacks get triggered).

However, instead only "two" is shown. It looks like the first clientside callback gets "overriden" somehow. This is not a problem when the callbacks have defined outputs.

There are some applications I have where it is useful for one component to trigger multiple clientside callbacks, so this bug does impact me (although it seems pretty straightforward to work around it).

Minimal example

#! /usr/bin/env python3
from dash import Dash, html, clientside_callback, Input

app = Dash()
app.layout = [
    html.Button("click me", id="testBtn"),
]

clientside_callback(
    """
    function(n_clicks) {
        console.log("one");
    }
    """,
    Input("testBtn", "n_clicks"),
    prevent_initial_call=True,
)

clientside_callback(
    """
    function(n_clicks) {
        console.log("two");
    }
    """,
    Input("testBtn", "n_clicks"),
    prevent_initial_call=True,
)

app.run(debug=True, port=8055)

Screen capture of the bug

Image

主要语言
Python
星标
24.4k
派生
2.3k
平均合并
1 天 21 小时
30 天内合并 PR
19

贡献指南

打开贡献指南

从这里开始

  1. 先读完整个 Issue，再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

plotly/dash 的其他 Issue

查看 plotly/dash 的全部 Issue

相似的 Issue

更多 Python Issue

把新 issue 发到你的邮箱

精选适合新手参与的 GitHub issue 摘要。