Update file javascript

Next, click the Agree and start the free download button. You might see a message like the one below based on your browser. This just means that recent versions of Chrome have dropped support for Java applets and Microsoft Silverlight. When you click the button, a file will start downloading. Analyze which files often get modified and apply a cache busting mechanism only to those files. Because caching is essential for performance point of view. For every refresh of the page, if all of its associated.

Hence, select only a few files which often get modified. View All. Pradeepa Achar Updated date Mar 09, Different types of cache busting Static Cache busting When a file is updated, all references to that file could be manually updated to increment sof version numbers such as 1, 2, 3, etc. Dave Paquette has a good example and explanation of cache busting here bottom of page Cache Busting.

I dynamically call this line of code in order to ensure that javascript has been re-retrieved from the web server instead of from the browser's cache in order to escape this problem. Athough it is framework specific, Django 1. A simple trick that works fine for me to prevent conflicts between older and newer javascript files. That means: If there is a conflict and some error occurs, the user will be prompted to press Ctrl-F5.

In case that no error occurs the welcome greeting above will hardly be visible and almost immediately be replaced by. If you are using PHP and Javascript then the following should work for you especially in the situation where you are doing multiple times changes on the file.

So, every time you cannot change its version. I made this code specifically for those who can't change any settings on the backend. In this case the best way to prevent a very long cache is with:. However, for most programmers the cache can be a few minutes or hours so the simple code above ends up forcing all users to download "the each page browsed". To specify how long this item will remain without reloading I made this code and left several examples below:.

Simplest solution? Don't let the browser cache at all. Append the current time in ms as a query. You are still in beta, so you could make a reasonable case for not optimizing for performance. But YMMV here. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How can I force clients to refresh JavaScript files? Ask Question. Asked 13 years, 4 months ago. Active 2 months ago. Viewed k times. Improve this question. Jason Plank 2, 4 4 gold badges 30 30 silver badges 39 39 bronze badges. AdamB AdamB 8, 4 4 gold badges 20 20 silver badges 14 14 bronze badges. Add a comment. Active Oldest Votes.

Improve this answer. Marco Bonelli Huppie Huppie Does anyone know if IE7 ignores this? It seems to be ignoring the appended data and using the cached file when I test in IE8 comparability view.

I always knew the query strings are key-value pair as in? For awareness: this is considered to be a hack. This method tricks the browser into thinking that a new file is being specified, as it simply looks at the full file name without interpreting it.

One downside is that both files will simultaneously exist in the users' cache, taking up unnecessary space. LeeWhite Both files will be cached in the browser no matter how you approach the problem. Either because they have different request params or different paths. So I don't think that's a disadvantage of the request param approach.

Show 9 more comments. Chase Seibert Chase Seibert He is talking about the headers sent by the web server for each file. Should be configurable in Apache for example.

For a development webapp, it's maybe a good solution. As you can see above, the download attribute is the easiest way to download a file on the browser. However, the download attribute only works in modern browsers. Internet Explorer does not support it. The idea is to programmatically create an anchor link, and then trigger the click event.

This method is especially helpful for dynamically generated file URLs. Sometimes, you may want to save programmatically generated data as a file using JavaScript.