javascript varying functionality between Chrome and Firefox

My Grease monkey script/Tamper monkey is designed to click on buttons that contain the word 'attach'. Although it works perfectly, I have noticed a difference in behavior between Chrome and Firefox.

In Firefox, the clicks occur in the order of appearance from top to bottom for all 'attach' buttons. However, in Chrome, the clicks happen in reverse order from bottom to top every time the page loads.

  1. What could be causing this variance in behavior?
  2. Would changing '==' to '===' make any difference?

Here is the code for my greasemonkey/tampermonkey script:

var inputs = document.getElementsByTagName('input');
for (x = 0; x < inputs.length; x++) {
myname = inputs[x].getAttribute('name');
if (myname.indexOf('attach') == 0) {
document.getElementsByName(myname) [0].click();
}
}

Answer №1

Make sure to correct any small errors in your code, as different browsers may handle them differently. I have personally experienced cases where one browser would automatically fix a syntax error while others did not.

var inputs = document.getElementsByTagName('input');

// Be sure to declare 'var' to keep scope local in the for loop
for (var x = 0; x < inputs.length; x++) {

    // Declare var here to avoid global scope
    var myname = inputs[x].getAttribute('name');

    if (myname.indexOf('attach') == 0) {

        // Correcting syntax error: remove extra space after (myname)
        document.getElementsByName(myname)[0].click();
    }
}

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