Remove All Nodes with (nodeName = “script”) from a Document Fragment *before placing it in dom*
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01-10-2019 - |
Pergunta
My goal is to remove all <[script]> nodes from a document fragment (leaving the rest of the fragment intact) before inserting the fragment into the dom.
My fragment is created by and looks something like this:
range = document.createRange();
range.selectNode(document.getElementsByTagName("body").item(0));
documentFragment = range.cloneContents();
sasDom.insertBefore(documentFragment, credit);
document.body.appendChild(documentFragment);
I got good range walker suggestions in a separate post, but realized I asked the wrong question. I got an answer about ranges, but what I meant to ask about was a document fragment (or perhaps there's a way to set a range of the fragment? hrmmm). The walker provided was:
function actOnElementsInRange(range, func) {
function isContainedInRange(el, range) {
var elRange = range.cloneRange();
elRange.selectNode(el);
return range.compareBoundaryPoints(Range.START_TO_START, elRange) <= 0
&& range.compareBoundaryPoints(Range.END_TO_END, elRange) >= 0;
}
var rangeStartElement = range.startContainer;
if (rangeStartElement.nodeType == 3) {
rangeStartElement = rangeStartElement.parentNode;
}
var rangeEndElement = range.endContainer;
if (rangeEndElement.nodeType == 3) {
rangeEndElement = rangeEndElement.parentNode;
}
var isInRange = function(el) {
return (el === rangeStartElement || el === rangeEndElement ||
isContainedInRange(el, range))
? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_SKIP;
};
var container = range.commonAncestorContainer;
if (container.nodeType != 1) {
container = container.parentNode;
}
var walker = document.createTreeWalker(document,
NodeFilter.SHOW_ELEMENT, isInRange, false);
while (walker.nextNode()) {
func(walker.currentNode);
}
}
actOnElementsInRange(range, function(el) {
el.removeAttribute("id");
});
That walker code is lifted from: Remove All id Attributes from nodes in a Range of Fragment
PLEASE No libraries (ie jQuery). I want to do this the raw way. Thanks in advance for your help
Solução
The easiest way to gather all <script>
nodes would be to use getElementsByTagName
, but unfortunately that is not implemented on DocumentFragment
.
However, you could create a temporary container and append all elements within the fragment, and then go through and remove all <script>
elements, like so:
var temp = document.createElement('div');
while (documentFragment.firstChild)
temp.appendChild(documentFragment.firstChild);
var scripts = temp.getElementsByTagName('script');
var length = scripts.length;
while (length--)
scripts[length].parentNode.removeChild(scripts[length]);
// Add elements back to fragment:
while (temp.firstChild)
documentFragment.appendChild(temp.firstChild);
Outras dicas
Correct me if I'm wrong, but if the documentFragment is a real DOM Fragment, you should be able to do something like:
var scripts = documentFragment.getElementsByTagName('script');
if (scripts.length){
for (var i=0, l = scripts.length;i<l;i++){
documentFragment.removeChild(scripts[i]);
}
}
right?
Correction: you can't apply getElementsByTagName to a documentFragment, J-P is right. You can however us a child of the fragment if it is a (cloned) node supporting getElementsByTagName. Here's some (working) code I use within a larger script a few days ago:
var fragment = d.createDocumentFragment(), f;
fragment.appendChild(document.createElement('div'));
fragment.firstChild.appendChild(zoeklijst.cloneNode(true));
f = fragment.firstChild;
return f.getElementsByTagName(getList); //<==