Assume there is a basic script available
var x = 0;
run();
function run() {
console.log(x++);
setTimeout(run, 1000);
}
If I input it into the Google Chrome console. How can I keep it running even after navigating to another page (continuously displaying numbers while surfing the internet)?
One solution could involve storing the variable 'x' within an onbeforeunload() function, and then executing a new script using that stored variable?
Is there a way for my script to keep running even when the page changes?
Unfortunately, once the page navigates to another one, the browser will stop running the script. The javascript code is tied to the specific page where it is executed.
How can I have my script continue counting numbers while browsing different pages?
You actually suggested a solution yourself. By saving the counter in localStorage, you can resume counting on the next page as long as the script and logic are implemented consistently across pages. Alternatively, consider moving some of the functionality to a server-side script for continuity.
Perhaps this sample script serves as an illustration, and showcasing numbers may not be your intended purpose.
If you are in need of a solution to execute a script even after exiting the browser, I recommend exploring Service workers.
For further information, you can refer to Jake Archibald's blog. Known for his work as a Chrome developer, he frequently delves into discussions about service workers. An introductory article can be found here.
While I didn't find any suitable suggestions for my project, I managed to come up with a solution that worked effectively. My goal was to include a static navigation element on a webpage without it disappearing after navigation. This particular webpage was not under my control. To achieve this, I cleared the innerHtml of the body, inserted an iframe directed at the same page, adjusted its dimensions to fill the entire screen, and removed the border. By doing so, I could navigate within the iframe while ensuring my script executed in a timed interval to reinsert the navigation element post-navigation. Here is what I did:
document.body.innerHTML = '';
iframe = document.createElement('iframe');
iframe.setAttribute('id', 'iframe');
document.body.appendChild(iframe);
iframe.setAttribute('src', window.location.href);
iframe.style.height = "100%";
iframe.style.width = "100%";
iframe.style.border = "0";
function addContent(){
setTimeout(()=>{
elementToAddTo = iframe.contentWindow.document.getElementById('my-element-id')];
contentToAdd = document.createElement('div');
contentToAdd.innerHTML = `<p>My new content</p>`
elementToAddTo.insertBefore(contentToAdd, elementToAddTo.childNodes[0]);
}, 1000);
}
addContent()
In the new content section, I included an onchange event that triggered navigation and called the addContent function using window.top.addContent();
onchange="window.location.href = window.location.href.replace(/(param1=.*)/, 'param1='+myNewParamValue); window.top.addContent();">
I acknowledge that this method assumes specific circumstances and may only be effective for certain scenarios—such as modifying a parameter value. Nonetheless, I'm sharing this in case it proves helpful to someone grappling with a similar challenge.
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