Trying to create DOM element "gota" from template. First I create template:
function htmlToElement(html) {
var template = document.createElement('template');
template.innerHTML = html;
return template.content.firstChild;
}
let gota = htmlToElement('<div class="gota"><div class="gota-rastro"><div class="rastro"></div></div><div class="gota-cabeza"></div></div>');
Second, I create collection from CSS class "gotea" and iterate for each element to append template:
function gotear() {
let gotas = document.getElementsByClassName('gotea');
for (let i = 0; i < gotas.length; i++) {
gotas[i].appendChild(gota);
}
}
gotear();
This just add "gota" element to a only one random element of the collection:
How can I add this template to ALL elements in a collection?
You're only creating one element. Then you're using that same element with appendChild multiple times, so you move it from one parent to the next.
You can clone the element with cloneNode(true) and append the clone:
gotas[i].appendChild(gota.cloneNode(true));
Side note: You can use insertAdjacentHTML rather than htmlToElement to insert elements based on that HTML directly:
function gotear() {
let gotas = document.getElementsByClassName('gotea');
for (let i = 0; i < gotas.length; i++) {
gotas[i].insertAdjacentHTML(
"beforeend",
'<div class="gota"><div class="gota-rastro"><div class="rastro"></div></div><div class="gota-cabeza"></div></div>'
);
}
}
gotear();
Granted, that means parsing the HTML repeatedly. But if not useful here, it might be useful elsewhere. (There's also insertAdjacentText.)
I'm trying to get the inner text of a header, then I would like to split the characters, then wrap each character in a span. I tried previously using insertBefore but I couldn't get it to work.
Here is my current code, which so far just logs each character.
// Title Split
const titleSplit = document.querySelectorAll('.title-split');
// Each El
Array.prototype.forEach.call(titleSplit, function(el, i) {
let innerText = el.innerText;
el.setAttribute('data-word', innerText);
const chars = innerText.split('');
Array.prototype.forEach.call(chars, function(el, i) {
console.log(el);
});
});
I specifically don't want any jQuery solutions. I'm trying to reverse learn Javascript to become more efficient. Any advise would be great. I tried putting in an insertBefore in the chars forEach but it just kept saying undefined.
document.querySelectorAll(...) return a NodeList which contains a method named .forEach(). So Instead of
Array.prototype.forEach.call(titleSplit, function(el, i) {
...
}
You can just do
titleSplit.forEach(...);
Similarly, you can just do
chars.forEach(...);
because chars is an array and you can call .forEach() method on an array.
Now coming to your question, once you have the chars array, you can use .map() method instead of .forEach(), to get a new array that contains strings where each character is wrapped by span tags.
const result = chars.map(c => `<span>${c}</span>`);
Finally, you need to iterate over the result array and insert its elements in the DOM.
result.forEach(el => document.body.append(el));
I have used document.body as the parent element of all the span elements. You can use any element that needs to be the parent element of all the span elements.
You can use map() inside the forEach() loop to construct the result with span. Also I will recommend you not to use innerText as a variable name as it is property name which can lead to some confusion:
// Title Split
const titleSplit = document.querySelectorAll('.title-split');
// Each El
Array.prototype.forEach.call(titleSplit, function(el, i) {
let ElText = el.innerText;
el.setAttribute('data-word', ElText);
const chars = ElText.split('');
var res = chars.map(function(el, i) {
return `<span>${el}</span>`;
}).join('');
el.innerHTML = res;
});
span{
border: 1px solid red;
padding: 2px;
}
<div class="title-split">Hello there</div>
const myHeader = querySelector('query my header please');
const spans = myHeader.innerText
.split('')
.map((char) => `<span>${char}</span>`)
.join('');
document.querySelector('query element to put them').innerHTML = spans;
// OR
document.querySelector('query element to put them').insertAdjacentHTML('beforeend', spans);
// etc.
I have this code that's to parse a string into html and display the text of each element.
That's working good except when I have nested tags for example <div><p>Element 1</p><p>Element 2</p></div>. In this case, the code displays <p>Element 1</p><p>Element 2</p>.
How can I do to get each tags one after the other ? (Here I want Element 1 and then Element 2)
Here's the code :
let text = new DOMParser().parseFromString(stringHtml, 'text/html');
let textBody = text.body.firstChild;
while (textBody) {
alert(textBody.innerHTML);
// other actions on the textBody element
textBody = textBody.nextSibling;
}
Thanks for helping me out
It sounds like you want a recursive function that prints the textContent of itself, or of its children, if it has children:
const stringHtml = '<div><p>Element 1</p><p>Element 2</p></div><div><p>Element 3</p><p>Element 4</p></div>';
const doc = new DOMParser().parseFromString(stringHtml, 'text/html');
const showElms = parent => {
const { children } = parent;
if (children.length) Array.prototype.forEach.call(children, showElms);
else console.log(parent.textContent);
}
showElms(doc.body);
That's assuming you want to iterate over the actual elements. If you want all text nodes instead, then recursively iterate over the childNodes instead.
I'm parsing content generated by a wysiwyg into a table of contents widget in React.
So far I'm looping through the headers and adding them into an array.
How can I get them all into one multi-dimensional array or object (what's the best way) so that it looks more like:
h1-1
h2-1
h3-1
h1-2
h2-2
h3-2
h1-3
h2-3
h3-3
and then I can render it with an ordered list in the UI.
const str = "<h1>h1-1</h1><h2>h2-1</h2><h3>h3-1</h3><p>something</p><h1>h1-2</h1><h2>h2-2</h2><h3>h3-2</h3>";
const patternh1 = /<h1>(.*?)<\/h1>/g;
const patternh2 = /<h2>(.*?)<\/h2>/g;
const patternh3 = /<h3>(.*?)<\/h3>/g;
let h1s = [];
let h2s = [];
let h3s = [];
let matchh1, matchh2, matchh3;
while (matchh1 = patternh1.exec(str))
h1s.push(matchh1[1])
while (matchh2 = patternh2.exec(str))
h2s.push(matchh2[1])
while (matchh3 = patternh3.exec(str))
h3s.push(matchh3[1])
console.log(h1s)
console.log(h2s)
console.log(h3s)
I don't know about you, but I hate parsing HTML using regexes. Instead, I think it's a better idea to let the DOM handle this:
const str = `<h1>h1-1</h1>
<h3>h3-1</h3>
<h3>h3-2</h3>
<p>something</p>
<h1>h1-2</h1>
<h2>h2-2</h2>
<h3>h3-2</h3>`;
const wrapper = document.createElement('div');
wrapper.innerHTML = str.trim();
let tree = [];
let leaf = null;
for (const node of wrapper.querySelectorAll("h1, h2, h3, h4, h5, h6")) {
const nodeLevel = parseInt(node.tagName[1]);
const newLeaf = {
level: nodeLevel,
text: node.textContent,
children: [],
parent: leaf
};
while (leaf && newLeaf.level <= leaf.level)
leaf = leaf.parent;
if (!leaf)
tree.push(newLeaf);
else
leaf.children.push(newLeaf);
leaf = newLeaf;
}
console.log(tree);
This answer does not require h3 to follow h2; h3 can follow h1 if you so please. If you want to turn this into an ordered list, that can also be done:
const str = `<h1>h1-1</h1>
<h3>h3-1</h3>
<h3>h3-2</h3>
<p>something</p>
<h1>h1-2</h1>
<h2>h2-2</h2>
<h3>h3-2</h3>`;
const wrapper = document.createElement('div');
wrapper.innerHTML = str.trim();
let tree = [];
let leaf = null;
for (const node of wrapper.querySelectorAll("h1, h2, h3, h4, h5, h6")) {
const nodeLevel = parseInt(node.tagName[1]);
const newLeaf = {
level: nodeLevel,
text: node.textContent,
children: [],
parent: leaf
};
while (leaf && newLeaf.level <= leaf.level)
leaf = leaf.parent;
if (!leaf)
tree.push(newLeaf);
else
leaf.children.push(newLeaf);
leaf = newLeaf;
}
const ol = document.createElement("ol");
(function makeOl(ol, leaves) {
for (const leaf of leaves) {
const li = document.createElement("li");
li.appendChild(new Text(leaf.text));
if (leaf.children.length > 0) {
const subOl = document.createElement("ol");
makeOl(subOl, leaf.children);
li.appendChild(subOl);
}
ol.appendChild(li);
}
})(ol, tree);
// add it to the DOM
document.body.appendChild(ol);
// or get it as text
const result = ol.outerHTML;
Since the HTML is parsed by the DOM and not by a regex, this solution will not encounter any errors if the h1 tags have attributes, for example.
You can simply gather all h* and then iterate over them to construct a tree as such:
Using ES6 (I inferred this is ok from your usage of const and let)
const str = `
<h1>h1-1</h1>
<h2>h2-1</h2>
<h3>h3-1</h3>
<p>something</p>
<h1>h1-2</h1>
<h2>h2-2</h2>
<h3>h3-2</h3>
`
const patternh = /<h(\d)>(.*?)<\/h(\d)>/g;
let hs = [];
let matchh;
while (matchh = patternh.exec(str))
hs.push({ lev: matchh[1], text: matchh[2] })
console.log(hs)
// constructs a tree with the format [{ value: ..., children: [{ value: ..., children: [...] }, ...] }, ...]
const add = (res, lev, what) => {
if (lev === 0) {
res.push({ value: what, children: [] });
} else {
add(res[res.length - 1].children, lev - 1, what);
}
}
// reduces all hs found into a tree using above method starting with an empty list
const tree = hs.reduce((res, { lev, text }) => {
add(res, lev-1, text);
return res;
}, []);
console.log(tree);
But because your html headers are not in a tree structure themselves (which I guess is your use case) this only works under certain assumptions, e.g. you cannot have a <h3> unless there's a <h2> above it and a <h1> above that. It will also assume a lower-level header will always belong to the latest header of an immediately higher level.
If you want to further use the tree structure for e.g. rendering a representative ordered-list for a TOC, you can do something like:
// function to render a bunch of <li>s
const renderLIs = children => children.map(child => `<li>${renderOL(child)}</li>`).join('');
// function to render an <ol> from a tree node
const renderOL = tree => tree.children.length > 0 ? `<ol>${tree.value}${renderLIs(tree.children)}</ol>` : tree.value;
// use a root node for the TOC
const toc = renderOL({ value: 'TOC', children: tree });
console.log(toc);
Hope it helps.
What you want to do is known as (a variant of a) document outline, eg. creating a nested list from the headings of a document, honoring their hierarchy.
A simple implementation for the browser using the DOM and DOMParser APIs goes as follows (put into a HTML page and coded in ES5 for easy testing):
<!DOCTYPE html>
<html>
<head>
<title>Document outline</title>
</head>
<body>
<div id="outline"></div>
<script>
// test string wrapped in a document (and body) element
var str = "<html><body><h1>h1-1</h1><h2>h2-1</h2><h3>h3-1</h3><p>something</p><h1>h1-2</h1><h2>h2-2</h2><h3>h3-2</h3></body></html>";
// util for traversing a DOM and emit SAX startElement events
function emitSAXLikeEvents(node, handler) {
handler.startElement(node)
for (var i = 0; i < node.children.length; i++)
emitSAXLikeEvents(node.children.item(i), handler)
handler.endElement(node)
}
var outline = document.getElementById('outline')
var rank = 0
var context = outline
emitSAXLikeEvents(
(new DOMParser()).parseFromString(str, "text/html").body,
{
startElement: function(node) {
if (/h[1-6]/.test(node.localName)) {
var newRank = +node.localName.substr(1, 1)
// set context li node to append
while (newRank <= rank--)
context = context.parentNode.parentNode
rank = newRank
// create (if 1st li) or
// get (if 2nd or subsequent li) ol element
var ol
if (context.children.length > 0)
ol = context.children[0]
else {
ol = document.createElement('ol')
context.appendChild(ol)
}
// create and append li with text from
// heading element
var li = document.createElement('li')
li.appendChild(
document.createTextNode(node.innerText))
ol.appendChild(li)
context = li
}
},
endElement: function(node) {}
})
</script>
</body>
</html>
I'm first parsing your fragment into a Document, then traverse it to create SAX-like startElement() calls. In the startElement() function, the rank of a heading element is checked against the rank of the most recently created list item (if any). Then a new list item is appended at the correct hierarchy level, and possibly an ol element is created as container for it. Note the algorithm as it is won't work with "jumping" from h1 to h3 in the hierarchy, but can be easily adapted.
If you want to create an outline/table of content on node.js, the code could be made to run server-side, but requires a decent HTML parsing lib (a DOMParser polyfill for node.js, so to speak). There are also the https://github.com/h5o/h5o-js and the https://github.com/hoyois/html5outliner packages for creating outlines, though I haven't tested those. These packages supposedly can also deal with corner cases such as heading elements in iframe and quote elements which you generally don't want in the the outline of your document.
The topic of creating an HTML5 outline has a long history; see eg. http://html5doctor.com/computer-says-no-to-html5-document-outline/. HTML4's practice of using no sectioning roots (in HTML5 parlance) wrapper elements for sectioning and placing headings and content at the same hierarchy level is known as "flat-earth markup". SGML has the RANK feature for dealing with H1, H2, etc. ranked elements, and can be made to infer omitted section elements, thus automatically create an outline, from HTML4-like "flat earth markup" in simple cases (eg. where only section or another single element is allowed as sectioning root).
I'll use a single regex to get the <hx></hx> contents and then sort them by x using methods Array.reduce.
Here is the base but it's not over yet :
// The string you need to parse
const str = "\
<h1>h1-1</h1>\
<h2>h2-1</h2>\
<h3>h3-1</h3>\
<p>something</p>\
<h1>h1-2</h1>\
<h2>h2-2</h2>\
<h3>h3-2</h3>";
// The regex that will cut down the <hx>something</hx>
const regex = /<h[0-9]{1}>(.*?)<\/h[0-9]{1}>/g;
// We get the matches now
const matches = str.match(regex);
// We match the hx togethers as requested
const matchesSorted = Object.values(matches.reduce((tmp, x) => {
// We get the number behind hx ---> the x
const hNumber = x[2];
// If the container do not exist, create it
if (!tmp[hNumber]) {
tmp[hNumber] = [];
}
// Push the new parsed content into the array
// 4 is to start after <hx>
// length - 9 is to get all except <hx></hx>
tmp[hNumber].push(x.substr(4, x.length - 9));
return tmp;
}, {}));
console.log(matchesSorted);
As you are parsing html content I want to aware you about special cases like presency of \n or space. For example look at the following non-working snippet :
// The string you need to parse
const str = "\
<h1>h1-1\n\
</h1>\
<h2> h2-1</h2>\
<h3>h3-1</h3>\
<p>something</p>\
<h1>h1-2 </h1>\
<h2>h2-2 \n\
</h2>\
<h3>h3-2</h3>";
// The regex that will cut down the <hx>something</hx>
const regex = /<h[0-9]{1}>(.*?)<\/h[0-9]{1}>/g;
// We get the matches now
const matches = str.match(regex);
// We match the hx togethers as requested
const matchesSorted = Object.values(matches.reduce((tmp, x) => {
// We get the number behind hx ---> the x
const hNumber = x[2];
// If the container do not exist, create it
if (!tmp[hNumber]) {
tmp[hNumber] = [];
}
// Push the new parsed content into the array
// 4 is to start after <hx>
// length - 9 is to get all except <hx></hx>
tmp[hNumber].push(x.substr(4, x.length - 9));
return tmp;
}, {}));
console.log(matchesSorted);
We gotta add .replace() and .trim() in order to remove unwanted \n and spaces.
Use this snippet
// The string you need to parse
const str = "\
<h1>h1-1\n\
</h1>\
<h2> h2-1</h2>\
<h3>h3-1</h3>\
<p>something</p>\
<h1>h1-2 </h1>\
<h2>h2-2 \n\
</h2>\
<h3>h3-2</h3>";
// Remove all unwanted \n
const preparedStr = str.replace(/(\r\n\t|\n|\r\t)/gm, "");
// The regex that will cut down the <hx>something</hx>
const regex = /<h[0-9]{1}>(.*?)<\/h[0-9]{1}>/g;
// We get the matches now
const matches = preparedStr.match(regex);
// We match the hx togethers as requested
const matchesSorted = Object.values(matches.reduce((tmp, x) => {
// We get the number behind hx ---> the x
const hNumber = x[2];
// If the container do not exist, create it
if (!tmp[hNumber]) {
tmp[hNumber] = [];
}
// Push the new parsed content into the array
// 4 is to start after <hx>
// length - 9 is to get all except <hx></hx>
// call trim() to remove unwanted spaces
tmp[hNumber].push(x.substr(4, x.length - 9).trim());
return tmp;
}, {}));
console.log(matchesSorted);
I write this code works with JQuery. (Please don't DV. Maybe someone needs a jquery answer later)
This recursive function creates lis of string and if one item has some childern, it will convert them to an ol.
const str =
"<div><h1>h1-1</h1><h2>h2-1</h2><h3>h3-1</h3></div><p>something</p><h1>h1-2</h1><h2>h2-2</h2><h3>h3-2</h3>";
function strToList(stri) {
const tags = $(stri);
function partToList(el) {
let output = "<li>";
if ($(el).children().length) {
output += "<ol>";
$(el)
.children()
.each(function() {
output += partToList($(this));
});
output += "</ol>";
} else {
output += $(el).text();
}
return output + "</li>";
}
let output = "<ol>";
tags.each(function(itm) {
output += partToList($(this));
});
return output + "</ol>";
}
$("#output").append(strToList(str));
li {
padding: 10px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="output"></div>
(This code can be converted to pure JS easily)
I would like to make a function which takes a string as input, creates several elements, then appends each element to the element previously created, so that the text is displayed as a list item, within a div, within a span. The intent is to eventually make a basic to do list, but for now I'm stuck on the basic steps
I thought that a for loop could be useful for the creation of elements, though I can't figure out how to append what I have previously appended. Here's how I started:
const elementsArray = [
'ol',
'li',
'div',
'span',
];
const makeToDoItem = (toDoItem) => {
for (i = 0; i < elementsArray.length; i++) {
const createElement =
document.createElement(elementsArray[i]);
document.body.appendChild(createElement);
};
};
makeToDoItem("post on stackoverflow");
I understand that
document.body.appendChild(createElement);
is doing what I am telling it to do: create four elements in the body. How can I append them the way I would like to?
Is the .map function better for this? I am having trouble grasping how to apply .map here.
Thanks for your help!
const elementsArray = [
'ol',
'li'
];
const makeToDoItem = (toDoItem) => {
for (i = 0; i < elementsArray.length; i++) {
const createElement =
document.createElement(elementsArray[i]);
if (elementsArray[i] === 'li') {
createElement.textContent = toDoItem;
}
document.body.appendChild(createElement);
};
};
makeToDoItem("post on stackoverflow");
makeToDoItem("another post");
You can do the above but instead you probably want to create the <ol> in HMTL and then append <li> elements inside it.