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var domUtils = {
/**
* Runs :callback if the DOM has loaded, otherwise runs it on load
*/
documentReady: (function() {
var loaded = false;
window.addEventListener("DOMContentLoaded", function() { loaded = true; });
return function(callback) {
if (loaded)
callback();
else
window.addEventListener("DOMContentLoaded", callback);
};
})(),
/*
* Takes an array of XPath selectors, adds the necessary namespaces (currently only XHTML), and applies them
* to the document root. The namespaceResolver in evaluateXPath should be kept in sync with the namespaces
* here.
*/
makeXPath: function(elementArray) {
var xpath = [];
for (var i in elementArray)
xpath.push("//" + elementArray[i], "//xhtml:" + elementArray[i]);
return xpath.join(" | ");
},
evaluateXPath: function(xpath, resultType) {
function namespaceResolver(namespace) {
return namespace == "xhtml" ? "http://www.w3.org/1999/xhtml" : null;
}
return document.evaluate(xpath, document.documentElement, namespaceResolver, resultType, null);
},
/**
* Returns the first visible clientRect of an element if it exists. Otherwise it returns null.
*/
getVisibleClientRect: function(element) {
// Note: this call will be expensive if we modify the DOM in between calls.
var clientRects = element.getClientRects();
var clientRectsLength = clientRects.length;
for (var i = 0; i < clientRectsLength; i++) {
if (clientRects[i].top < -2 || clientRects[i].top >= window.innerHeight - 4 ||
clientRects[i].left < -2 || clientRects[i].left >= window.innerWidth - 4)
continue;
if (clientRects[i].width < 3 || clientRects[i].height < 3)
continue;
// eliminate invisible elements (see test_harnesses/visibility_test.html)
var computedStyle = window.getComputedStyle(element, null);
if (computedStyle.getPropertyValue('visibility') != 'visible' ||
computedStyle.getPropertyValue('display') == 'none')
continue;
return clientRects[i];
}
for (var i = 0; i < clientRectsLength; i++) {
// If the link has zero dimensions, it may be wrapping visible
// but floated elements. Check for this.
if (clientRects[i].width == 0 || clientRects[i].height == 0) {
for (var j = 0, childrenCount = element.children.length; j < childrenCount; j++) {
var computedStyle = window.getComputedStyle(element.children[j], null);
// Ignore child elements which are not floated and not absolutely positioned for parent elements with zero width/height
if (computedStyle.getPropertyValue('float') == 'none' && computedStyle.getPropertyValue('position') != 'absolute')
continue;
var childClientRect = this.getVisibleClientRect(element.children[j]);
if (childClientRect === null)
continue;
return childClientRect;
}
}
};
return null;
},
/*
* Selectable means the element has a text caret; this is not the same as "focusable".
*/
isSelectable: function(element) {
var selectableTypes = ["search", "text", "password"];
return (element.nodeName.toLowerCase() == "input" && selectableTypes.indexOf(element.type) >= 0) ||
element.nodeName.toLowerCase() == "textarea";
},
simulateSelect: function(element) {
element.focus();
// When focusing a textbox, put the selection caret at the end of the textbox's contents.
element.setSelectionRange(element.value.length, element.value.length);
},
simulateClick: function(element, modifiers) {
modifiers = modifiers || {};
var eventSequence = [ "mouseover", "mousedown", "mouseup", "click" ];
for (var i = 0; i < eventSequence.length; i++) {
var event = document.createEvent("MouseEvents");
event.initMouseEvent(eventSequence[i], true, true, window, 1, 0, 0, 0, 0, modifiers.ctrlKey, false, false,
modifiers.metaKey, 0, null);
// Debugging note: Firefox will not execute the element's default action if we dispatch this click event,
// but Webkit will. Dispatching a click on an input box does not seem to focus it; we do that separately
element.dispatchEvent(event);
}
},
// momentarily flash a rectangular border to give user some visual feedback
flashRect: function(rect) {
var flashEl = document.createElement("div");
flashEl.id = "vimiumFlash";
flashEl.className = "vimiumReset";
flashEl.style.left = rect.left + window.scrollX + "px";
flashEl.style.top = rect.top + window.scrollY + "px";
flashEl.style.width = rect.width + "px";
flashEl.style.height = rect.height + "px";
document.body.appendChild(flashEl);
setTimeout(function() { flashEl.parentNode.removeChild(flashEl); }, 400);
},
};
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