问题
What i want to do :
->Show a plain HTML page to a user ->User has the ability to highlight text on that page ->When user logs in next time , i should be able to retrieve and show his previous (multiple) highlight on the page.
What i have done :
I used the Library/API : Rangy.With this iam able to select the text and highlight it with the users preferred color.
The Problem :
I tried the serialize and de-serialize function , but when i try to deserialize (after page has been reloaded) it gives me an error saying
checksums of serialized range root node (ec0c8cf0) and target root node (d4997863) do not match
Everytime i reload the page , there is a new root node , how can i fix the deserialize in this case ?
Created a JS-Fiddle : demo / js-fiddle
What is this - If you check my demo , i select the first word of the description ie "Please " , i get the text highlighted , and i also get the serial as :
0/3/1/3/0/1/1/2:9,0/3/1/3/0/1/1/2:9{b3002d92}
so what i did is , i hard coded this serial and put it into the deserializeSelection funciton in the page onLoad function like this :-
rangy.deserializeSelection('0/3/1/3/0/1/1/2:9,0/3/1/3/0/1/1/2:9{b3002d92}');
so technically , it should highlight the "Please" in the description , whenever the page loads , irrespectively.But it does not , instead give me the above error in block. Can you help me solve this.please.Thank you
Extra:
1.I really do not understand the serialize and de-serialize methods of rangy.
2.My very abstract road map from here is to , do an AJAX call , on page load and fetch all (serialized) selection of the user for this page from my db and iterate over them and do a de-serialize.
Any help , would be really appreciated. Thank you.
回答1:
What I think is you should try this:
var selObj = rangy.getSelection();
var se = rangy.serializeSelection(selObj, true); //true to avoid DOM checksum
来源：https://stackoverflow.com/questions/14416524/restore-multiple-selections-from-db-using-rangy