Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
A utility function, for Greasemonkey scripts, that detects and handles AJAXed content.
/*--- waitForKeyElements(): A utility function, for Greasemonkey scripts,
that detects and handles AJAXed content. Forked for use without JQuery.
Usage example:
waitForKeyElements (
"div.comments"
, commentCallbackFunction
);
//--- Page-specific function to do what we want when the node is found.
function commentCallbackFunction (element) {
element.text ("This comment changed by waitForKeyElements().");
}
IMPORTANT: Without JQuery, this fork does not look into the content of
iframes.
*/
function waitForKeyElements (
selectorTxt, /* Required: The selector string that
specifies the desired element(s).
*/
actionFunction, /* Required: The code to run when elements are
found. It is passed a jNode to the matched
element.
*/
bWaitOnce /* Optional: If false, will continue to scan for
new elements even after the first match is
found.
*/
) {
var targetNodes, btargetsFound;
targetNodes = document.querySelectorAll(selectorTxt);
if (targetNodes && targetNodes.length > 0) {
btargetsFound = true;
/*--- Found target node(s). Go through each and act if they
are new.
*/
targetNodes.forEach(function(element) {
var alreadyFound = element.dataset.found == 'alreadyFound' ? 'alreadyFound' : false;
if (!alreadyFound) {
//--- Call the payload function.
var cancelFound = actionFunction (element);
if (cancelFound)
btargetsFound = false;
else
element.dataset.found = 'alreadyFound';
}
} );
}
else {
btargetsFound = false;
}
//--- Get the timer-control variable for this selector.
var controlObj = waitForKeyElements.controlObj || {};
var controlKey = selectorTxt.replace (/[^\w]/g, "_");
var timeControl = controlObj [controlKey];
//--- Now set or clear the timer as appropriate.
if (btargetsFound && bWaitOnce && timeControl) {
//--- The only condition where we need to clear the timer.
clearInterval (timeControl);
delete controlObj [controlKey];
}
else {
//--- Set a timer, if needed.
if ( ! timeControl) {
timeControl = setInterval ( function () {
waitForKeyElements ( selectorTxt,
actionFunction,
bWaitOnce
);
},
300
);
controlObj [controlKey] = timeControl;
}
}
waitForKeyElements.controlObj = controlObj;
}
@DinoChiesa

This comment has been minimized.

Copy link

DinoChiesa commented Jul 26, 2019

Thank you! Helpful.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.