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;
}

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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-64f5-1b336aa-2abd8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b336aa-2abd8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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