Trying to create greasemonkey to check a box on a page

Question

New greasemonkey user, I have put together this code to check a box name isRegex... but the check box code is skipped

console.log("Monkey script");
var chkBox,regBox;
var sQuery = "//input[@type='checkbox']"
chkBox = document.evaluate(sQuery, document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
for ( var i = 0; i < chkBox.snapshotLength; i++){
    regBox = chkBox.snapshotItem(i);
    if (regBox.name == "isRegex" && regBox.checked == false){
        regBox.checked = true;
    }
}
console.log("Done");

chkBox.snapshotLength looks like a method, but all documentation I have seen uses it this way. I have tried, chkBox.snapshotLength() but nothing. Pointer please?

tried to add a wait till the page loads?

window.addEventListener('load', function() {
    var chkBox = document.getElementsByName('isRegex');
    const clickEvent = document.createEvent('MouseEvents');
    clickEvent.initEvent('click', false, true);
    chkBox.dispatchEvent(clickEvent);
    console.log(chkBox);
}, false);
console.log("Done");

Error:

Paused on exception
TypeError: chkBox.dispatchEvent is not a function

Do you have a reason to not use document.querySelectorAll? I'd advise trying that. You might also need to use MutationObserver to watch for new checkboxes being added in case the form you're trying to affect is loaded after the page load. Or - a lazy solution - setInterval with 800ms interval and keep trying until you find the checkbox. — Tomáš Zato
– Tomáš Zato, Commented Feb 20, 2024 at 11:34

Lankhaar · Accepted Answer · 2024-09-10 19:59:13Z

0

Could you please specify what it is exactly you're trying to accomplish? You try to toggle that checkbox on/off?

If so then try the following:

window.addEventListener('load', () => {
    var checkbox = document.querySelector('input[name="isRegex"]');
    checkbox.click()
});

answered Sep 10, 2024 at 19:59

Lankhaar

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