Hidden ASP: the makeup for the problem where the Panel cannot find the name

The last time I wrote a short article saying "ASP: Panel" is set to invisible. if Javascript is used for control, it cannot be found because this control is not generated on the page. I guess the reason is: 1. Ms hides the invisible data of the panel; 2. the server does not compile the control. After so many days, no one asked questions. It seems that everyone is only for what reason. In fact, when I wrote the short article and went home, I thought of the reason. It was very simple. asp: the code for generating the client on the panel is not usable for div hiding, plus style = "display: none "is OK.