82 lines
2.8 KiB
JavaScript
82 lines
2.8 KiB
JavaScript
/*--- waitForKeyElements(): A utility function, for Greasemonkey scripts,
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that detects and handles AJAXed content.
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Usage example:
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waitForKeyElements (
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"div.comments"
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, commentCallbackFunction
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);
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//--- Page-specific function to do what we want when the node is found.
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function commentCallbackFunction (jNode) {
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jNode.text ("This comment changed by waitForKeyElements().");
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}
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IMPORTANT: This function requires your script to have loaded jQuery.
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*/
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function waitForKeyElements(
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selectorTxt /* Required: The jQuery selector string that
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specifies the desired element(s).
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*/,
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actionFunction /* Required: The code to run when elements are
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found. It is passed a jNode to the matched
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element.
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*/,
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bWaitOnce /* Optional: If false, will continue to scan for
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new elements even after the first match is
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found.
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*/,
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iframeSelector /* Optional: If set, identifies the iframe to
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search.
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*/
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) {
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let targetNodes, btargetsFound;
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if (typeof iframeSelector == "undefined") targetNodes = selectorTxt;
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else targetNodes = iframeSelector.contents().find(selectorTxt);
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if (targetNodes && targetNodes.length > 0) {
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btargetsFound = true;
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/*--- Found target node(s). Go through each and act if they
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are new.
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*/
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targetNodes.each(function () {
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let jThis = this;
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let alreadyFound = jThis.data("alreadyFound") || false;
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if (!alreadyFound) {
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//--- Call the payload function.
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let cancelFound = actionFunction(jThis);
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if (cancelFound) btargetsFound = false;
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else jThis.data("alreadyFound", true);
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}
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});
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} else {
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btargetsFound = false;
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}
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//--- Get the timer-control variable for this selector.
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let controlObj = waitForKeyElements.controlObj || {};
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let controlKey = selectorTxt.replace(/[^\w]/g, "_");
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let timeControl = controlObj[controlKey];
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//--- Now set or clear the timer as appropriate.
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if (btargetsFound && bWaitOnce && timeControl) {
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clearInterval(timeControl);
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delete controlObj[controlKey];
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} else {
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//--- Set a timer, if needed.
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if (!timeControl) {
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timeControl = setInterval(function () {
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waitForKeyElements(
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selectorTxt,
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actionFunction,
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bWaitOnce,
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iframeSelector
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);
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}, 300);
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controlObj[controlKey] = timeControl;
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}
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}
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waitForKeyElements.controlObj = controlObj;
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}
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