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convert canvas to png image

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alexadam 2016-09-09 19:31:37 +03:00
parent c752f7a3b6
commit 586173d87f
2 changed files with 61 additions and 11 deletions
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49
web-extension/utils.js
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@ -175,3 +175,52 @@ function getBase64ImgData(srcTxt) {
return '';
}
}
function getXPath(elm) {
var allNodes = document.getElementsByTagName('*');
for (var segs = []; elm && elm.nodeType === 1; elm = elm.parentNode) {
if (elm.hasAttribute('id')) {
var uniqueIdCount = 0;
for (var n = 0; n < allNodes.length; n++) {
if (allNodes[n].hasAttribute('id') && allNodes[n].id === elm.id) {
uniqueIdCount++;
}
if (uniqueIdCount > 1) {
break;
}
}
if (uniqueIdCount === 1) {
segs.unshift('id("' + elm.getAttribute('id') + '")');
return segs.join('/');
} else {
segs.unshift(elm.localName.toLowerCase() + '[@id="' + elm.getAttribute('id') + '"]');
}
} else if (elm.hasAttribute('class')) {
segs.unshift(elm.localName.toLowerCase() + '[@class="' + elm.getAttribute('class') + '"]');
} else {
for (i = 1, sib = elm.previousSibling; sib; sib = sib.previousSibling) {
if (sib.localName === elm.localName) {
i++;
}
}
segs.unshift(elm.localName.toLowerCase() + '[' + i + ']');
}
}
return segs.length ? '/' + segs.join('/') : null;
}
function lookupElementByXPath(path) {
var evaluator = new XPathEvaluator();
var result = evaluator.evaluate(path, document.documentElement, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
return result.singleNodeValue;
}
function generateRandomTag(tagLen) {
tagLen = tagLen || 5;
var text = '';
var possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
for(var i = 0; i < tagLen; i++) {
text += possible.charAt(Math.floor(Math.random() * possible.length));
}
return text;
}