I'm looking to incorporate a random number into the window name in this code snippet:
var rand = 185656;
setTimeout("win+rand+2 = window.open('url'+secid , '_blank')",2000);
The +rand+ part is not functioning as expected.
I'm looking to incorporate a random number into the window name in this code snippet:
var rand = 185656;
setTimeout("win+rand+2 = window.open('url'+secid , '_blank')",2000);
The +rand+ part is not functioning as expected.
Instead of passing a string to the setTimeout function, it's recommended to pass a function and explicitly set your global property on the window object. This way, you can use square bracket notation:
setTimeout(function () {
window["win" + rand + "2"] = window.open("url" + secid, "_blank");
}, 2000);
The main reason for avoiding passing a string to setTimeout (or setInterval) is that it essentially uses eval, which can pose security risks.
If you pass a string like in your current setup, it will result in a reference error. It's akin to attempting something like this, which clearly won't work:
"a" + "b" = "c"; // ReferenceError: Invalid left-hand side in assignment
The content should always be outside of the quotation marks.
setTimeout("win"+rand+"2 = window.open('url'+secid , '_blank')",2000);
To start, it's crucial to avoid passing strings to setTimeout and instead opt for using the callback function. Additionally, ensure that the variable is placed outside of the string (quotes) when concatenating:
let num = 587332;
setTimeout(function() {
window["popup" + num + "3"] = window.open('newurl'+uniqueid , '_blank');
}, 3000);
You must ensure to "open" and "close" the String properly:
setTimeout("win" + rand + "2 = window.open('url'" + secid + " , '_blank')",2000);
Refer to this helpful article for more details.
Avoid passing executable code to setTimeout (since it will be eval'd), rather use a function reference or an anonymous function.
Furthermore, creating variable names in this manner is not recommended. Consider utilizing objects and keys instead.
You might want to consider the following approach:
setTimeout(function(){
var rand = 185656;
window['win' + rand + '2'] = window.open('url'+secid , '_blank'); //adds a property to the global object
}, 2000);
Perhaps the issue lies with the quotation marks
setTimeout("win"+parseInt(rand)+"2 = window.open('url'+secid , '_blank')",2000);
After a brief delay of 2 seconds, a new window will open with a dynamically generated URL.
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