Question

I am using replace to search my dynamically loaded webpage for this symbol Æ and replace it with ®. I found the code to do so in this question: Find and replace specific text characters across a document with JS

#! /usr/bin/env python3
import csv
import statistics


def main():
    with open('data.csv', newline='') as file:
        reader = csv.DictReader(file)
        column = {key: [] for key in reader.fieldnames}
        for row in reader:
            for key in reader.fieldnames:
                column[key].append(row[key])
    print('Header1 Average =', statistics.mean(map(float, column['Header1'])))
    print('Header2 Average =', statistics.mean(map(float, column['Header2'])))
    print('Header3 Average =', statistics.mean(map(float, column['Header3'])))


if __name__ == '__main__':
    main()

However, after I added this code, this function stopped working.

    $("body").children().each(function () {
            $(this).html( $(this).html().replace(/Æ/g,"&reg;") );
    });

Can anyone tell me why this might happen?

Answer 1

In the second chunk of code (which I assume runs first) you are locating an element in the DOM and assigning a value to a property of it.

The first chunk of code goes over the DOM and converts large chunks of it into HTML source code, it then modifies that source code, then it generates new DOM elements from it and replaces whatever was there before with them.

So the element with the ID sqlite3 *db; char *error; int rc; rc = sqlite3_open("db.sql", &db); if (rc) { cout << "Error Connecting"; sqlite3_close(db); } else { char **results = NULL; int rows, columns; const char *sqlSelect = "SELECT name, surname, dob FROM data"; sqlite3_get_table(db, sqlSelect, &results, &rows, &columns, &error); if (rc) { system("color 0c"); cout << "Error executing query"; } else { // What to put here? } }:

Gets a click handler
Is converted to HTML
Is destroyed
Is replaced by a new version created from its old HTML

The click handler was only ever on the DOM, so the new element doesn't have it.

If you are going to take this approach, then you should look at looping over just the text nodes in the document and dealing in text rather than HTML. To do that you'll need to recursively loop over the DOM and test the node type of each element.

It would be better to fix the underlying problem that you are hacking around though. It is almost certainly down to an incorrectly specified character encoding somewhere.

The W3C has some material on character encodings that might be helpful.

Answer 2

By doing this:

try (BufferedReader br = null){
    System.out.println("Test");
}
catch (IOException e){
    e.printStackTrace();
}

You re-create all the $("body").children().each(function () { $(this).html( $(this).html().replace(/Æ/g,"®") ); }); elements, so any events that you might have bound before are lost. Don't use the HTML function to replace text. And still, I'm not sure that this is the best way to replace a character.

This replace should be done server-side, not client side. By doing it client-side (in JavaScript) you can get into different problems like SEO (Google indexing your site with your badly encoded characters). If the characters are like this inside a file, simply replace them in that file, make sure to save the file with the right encoding.

Why is replace() disrupting onclick()?

2 个答案: