如何限制 Shiny 应用程序中 textInput 接受的字符数 [英] How to limit the number of characters accepted by textInput in Shiny app

问题描述

我希望我的 Shiny 应用程序(在 R 中)限制用户可以输入的字符数以响应 textInput 命令.

I would like my Shiny app (in R) to limit the number of characters a user can input in response to a textInput command.

我可以要求用户限制为 50 个字符，如果他不这样做，可以让应用向他发送消息，但如果他首先被阻止超过限制会更好.

I can request the user to limit to 50 characters and can have the app send him a message if he does not, but it would be better if he were prevented from overrunning the limit in the first place.

感谢建议.

推荐答案

你不能给 textInput 添加自定义属性，你可能可以编写自定义函数来生成输入，但在 javascript 中这样做会更容易:

You can't add custom attribute to textInput, you could probably be able to write custom function to generate input, but it will be easier to do this in javascript:

shinyjs::runjs("$('#inputName').attr('maxlength', 50)")

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