Need to append a random string or int to the end of file URL being called in JS

user_15796805 0
Viewed 178

I'm working with a set of files that are getting updated automatically multiple times a day and being called by two different scripts with a similar purpose. I need browsers to not cache them as they are always changing.

The current Javascript code looks like this:

profile_filename: window.location.origin + "/pdf/2021GraduateForm-4-29-2021v1.csv",

And the goal is to make the file look more like this but using a random value each time:

profile_filename: window.location.origin + "/pdf/2021GraduateForm-4-29-2021v1.csv?123456789",

Does anyone have any advice for how I can make this change, where '123456789' would be something random. Most of the documentation I've seen is for PHP and doesn't include the 'window.location' that I'm using.

caching javascript
2 Answers

If you serve these files and wand browsers not cache the files, must set extra header like this: responce.setHeader('Cache-Control', 'no-store, max-age=0');

If you want to create a unique query string ?.... i think that can use the time like this: profile_filename: window.location.origin + "/pdf/2021GraduateForm-4-29-2021v1.csv"+"?"+(new Date).toJSON()

If you want a "like random" value in query string, use for example something like this: profile_filename: window.location.origin + "/pdf/2021GraduateForm-4-29-2021v1.csv"+"?"+ crypto.createHash('md5').update((new Date).toJSON(), 'utf8').digest('hex');

user_157948280

if you just need to add unique numbers at the end of the path, and your needs don't require totally random number generating, you can add the timestamp instead.

profile_filename: window.location.origin + `/pdf/2021GraduateForm-4-29-2021v1.csv?${Date.now()}`,

Because timestamp is cumulative, it will be unique number

user_140959960
Related