How can I click a item with Greasemonkey?

问题:

<ul class="myList clearfix" id="thismyList">
    <li class="myBullet" id="answer1">blabla1</li>
    <li class="myBullet" id="answer2">blabla2</li>
    <li class="myBullet" id="answer3">blabla3</li>
</ul>

In this page, how can I automatically click item blabla2?

回答1:

The shortest and most powerful is probably the XPath way (btw - it's one of the few w3 specifications that are actually a very good and helpful read). You can have almost any conditions you want to have.

var xresult = document.evaluate("//*[text()='blabla2']", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
xresult.singleNodeValue.click();

evaluate(), click()

See this doc to know more about XPath in JavaScript.

---

The non-XPath way would be to go through all the nodes manually and search for the first one containing the right text:

var findElem = function(elems, text) {
    for (var i = 0; i < elems.length; i++) {
        if (elems[i].textContent == text) {
            return elems[i];
        } else {
            var result = findElem(elems[i].children, text);
            if (result != undefined) {
                return result;
            }
        }
    }
    return;
}

findElem(document.documentElement.children, "blabla2").click();