How to put the content in INPUT, Synchronize into the textarea editor?

I have a form page that needs to put the value in the title input, Synchronize, into a prefabricated DIV in the textarea editor below. Worked for a long time, found that Synchronize does not go in, but can Synchronize to some element on the page, but can not Synchronize to a prefabricated element in the textarea editor. Ask for help?

ID:c-title
of the title form in the figure prefabricated a DIV of ID:ctitle in the editor

JS:
< script type= "text/javascript" >
var put1=document.getElementById ("c-title");
var div1=document.getElementById ("ctitle");
put1.onkeyup=function () {

div1.innerHTML=put1.value;

}
< / script >

Javascript html
Mar.22,2021

this problem may be that there is no DOM node where id is ctitle on the page. You can add the following code to take a look at the output information of the console 

put1.onkeyup=function(){
   console.log(div1);
   div1.innerHTML=put1.value;
}

Previous: Wechat shares the problem

Next: Nuxt generate packages to generate relative paths

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-42aceda-630a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-42aceda-630a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?