event.preventDefault不能在所有地方工作吗？

Question

i made a chrome extension to get element from web pages by using click event listener on content page but preventDefault is working for few times only.

for example on this website when i click on the menu bar it redirects to the next page instead of preventing click action to happen. this is my event listener in content.js

document.addEventListener('click', function xyz(e){
e.preventDefault();
//alert(e);
var target = e.target || event.srcElement;
var attributes = Array.prototype.slice.call(target.attributes).map(function(i)    {
    return [String(i.name)+": "+String(i.value)]
})
alert(attributes);
prompt("xpath1 :",getPathTo(target));
chrome.runtime.sendMessage({method:"captureElement",data:attributes});   
},true)

how to stop click event from occuring !

Answer 1

This is because you attach the event handler on the document itself instead of some child. So if you click on a child element the event will be prevented only when it will reach the document through bubbling, but in the mean time it will have been triggered.

Answer 2

You either need to use return false; or use e.preventDefault(); and e.stopPropagation() together. Because this will prevent event from bubbling up to the parent anchor tag.