<ul id='parent_of_all'>
<li>
<span class='operator'>&&</span>
<ul>
<li>
<span class='operator'>||</span>
<ul>
<li>
<span class='operator'>&&</span>
<ul>
<li>
<span class='condition'>1 == 1</span>
</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li>
<span class='condition'>1 != 0</span>
</li>
</ul>
</li>
</ul>
to
{"&&":[{'||':[ {'&&':[ {"lhs": "1", "comparator": "==", "rhs":"1"} ]} ] } , {"lhs": "1", "comparator": "!=", "rhs":"0"}]}
As of now, I know the basics of jQuery, JavaScript. I need to know where to start thinking in order to accomplish the above conversion.
And the html tree could be more complex with more children.
You can do this with each and map
var obj = {}
var span = $('li > span').not('ul li span').text();
$('ul li span').each(function() {
var text = $(this).text().split(' ');
obj[span] = (obj[span]||[]).concat({lhs: text[0], comparator: text[1], rhs: text[2]});
});
console.log(obj)
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<li>
<span>&&</span>
<ul>
<li>
<span>1 == 1</span>
</li>
</ul>
<ul>
<li>
<span>1 != 0</span>
</li>
</ul>
</li>
You will need a way to select the first level of li, I assumed you have a parent element with an id such as list. I wrote the following code using basic jquery so you can understand it.
var result = {};
var $all_li = $('#list').children('li'); // selecting the first level of li
for(var i in $all_li){ // iterating all_li using for (you may use forEach )
var $current_li = $( $all_li[i] ); // getting operator from first span
var operator = $current_li.children('span').html(); // the text of the operator
var $inner_spans = $current_li.find('>ul >li >span'); // getting list of children spans (from path $list>li>ul>li>span)
var li_spans = []; // an array where we will put the inner span objects
for(var j in $inner_spans){ // iterating the inner spans
var text = $($inner_spans[j]).html().split(" "); // splitting the html
li_spans.push({
lhs: text[0],
comparator: text[1],
rhs: text[2]
}); // adding the splitted html to an object. Note: error if text didn't have 2 white spaces
}
result[operator] = li_spans; // adding the operator key and li_spans value to the result json
}
This code will parse the html and construct the result json, it should work for the html format you provided. Keep in mind that it does not handle errors (such as bad tree format).
simmiar html formats.
Thanks #Alexandru and #Nenad for giving a start. I have been able to complete this on my own.
Below is the function that generates json.
function prepare_json(current_node){
var object = {}
var span = $(current_node).children('span')
if (span.hasClass('condition')){
var text = span.html().split(" ");
object = {lhs: text[0], comparator: text[1], rhs: text[2]}
}
else if(span.hasClass('operator')){
var operator = span.text()
object[operator] = (object[operator] || [])
var children = $(current_node).children('ul').children('li')
for(var i = 0; i < children.length; i++){
var child_pql = prepare_json([children[i]])
object[operator].push(child_pql)
}
}
return object
}
Below is the code that calls that function:
var parent_node = $('#parent_of_all').children('li')
var json = JSON.stringify(prepare_pql_json(parent_node), null, 2)
Related
I need to concatenate all the title value starting from second li elements with Javascript.
The problem is that I want to use it in different pages, so I can't know the exact number of li elements.
<div id="breadcrumb">
<ul>
<li title="One">One</li>
<li title="Two">Two</li>
<li title="Three">Three</li>
<li title="Four">Four</li>
</ul>
</div>
I use a variable for each element but if one or more element is missing the var is not valid and the concat function doesn't work.
var a = document.querySelector(".breadcrumb li:nth-child(2) > a").getAttribute("title");
var b = document.querySelector(".breadcrumb li:nth-child(3) > a").getAttribute("title");
var c = document.querySelector(".breadcrumb li:nth-child(4) > a").getAttribute("title");
var d = document.querySelector(".breadcrumb li:nth-child(4) > a").getAttribute("title");
var str = a.concat(b,c,d);
console.log(str)
Is there a way to do that?
Use querySelectorAll() and map():
const res = [...document.querySelectorAll("#breadcrumb li:not(:first-of-type)")].map(el => el.getAttribute("title")).join(" ")
console.log(res)
<div id="breadcrumb">
<ul>
<li title="One">One</li>
<li title="Two">Two</li>
<li title="Three">Three</li>
<li title="Four">Four</li>
</ul>
</div>
Using a little jquery i achieved this and it should solve your issues.
let list = [];
$('#breadcrumb li').each(function(i){
if(i !== 0) { list.push($(this).attr('title')); }
});
list.toString() //One,Two,Three,Four
The method you tried to use wont scale on a large list
Two minor remarks:
If you want to access the id=breadcrumb, you have to use #breadcrumb instead of .breadcrumb
There is no a tag in your HTML-code, therefore your querySelector won't give you any result
However, let's discuss a solution:
let listElements = document.querySelectorAll("#breadcrumbs li"); // get all list elements
listElements = Array.from(listElements); // convert the NodeList to an Array
listElements = listElements.filter((value, index) => index >= 1); // remove the first element
let titleAttributes = listElements.map(listElement => listElement.getAttribute("title")); // get the title attributes for every list elements. The result is an array of strings containing the title
console.log(titleAttributes.join(", ")); // concatenate the titles by comma
You can write the above statements in a single line:
Array.from(document.querySelectorAll("#breadcrumbs li"))
.filter((value, index) => index >= 1)
.map(listElement => listElement.getAttribute("title"))
.join(", ");
EDIT: I fix my answer, thanks to Barmar
something like that ?
const All_LI = [...document.querySelectorAll('#breadcrumb li')];
let a = ''
for (let i=1; i<All_LI.length; i++) { a += All_LI[i].title }
console.log('a-> ', a )
// .. or :
const b = All_LI.reduce((a,e,i)=>a+=(i>0)?e.title:'', '' )
console.log('b-> ', b )
<div id="breadcrumb">
<ul>
<li title="One">One</li>
<li title="Two">Two</li>
<li title="Three">Three</li>
<li title="Four">Four</li>
</ul>
</div>
I am trying to gather these HTML objects through getElementsByClassName, and push them into a JavaScript array and then I want to create a JavaScript alert to display these names. I’ve been trying this for hours. Am I doing something wrong?
var names = []
var elm = document.getElementsByClassName('name');
names.push(elm);
var arr = names.join();
alert(arr)
<h2>
List of People:
</h2>
<ul class='people'>
<li class='name'>
Clara
</li>
<li class='name'>
James
</li>
<li class='name'>
Sara
</li>
</ul>
getElementsByClassName does not give you the text inside the elements, but the elements themselves.
Also you won't get them as a proper JavaScript array, but a collection of HTMLElements.
Here's what you can do:
var names = []
var elements = document.getElementsByClassName('name');
for(var i=0; i<elements.length; i++) names.push(elements[i].textContent)
var nameList = names.join()
alert(nameList)
Alternatively you may use Array.from and map:
Array.from(elements).map((elem) => elem.textContent)
Note that I'm using elements[i].textContent to get the text inside each element.
Simply Try with querySelectorAll() .Then apply Nodelist#forEach() to iterate the node list .Finally push into array with element or element attribute which you want
var names = []
var elm = document.querySelectorAll('.name').forEach(function(a){
names.push(a.innerHTML);
});
var arr = names.join();
console.log(arr);
alert(arr)
<h2>
List of People:
</h2>
<ul class='people'>
<li class='name'>
Clara
</li>
<li class='name'>
James
</li>
<li class='name'>
Sara
</li>
</ul>
When we call elements by class name it returns array so you have run loop...
List of People:
<ul class='people'>
<li class='name'>
Clara
</li>
<li class='name'>
James
</li>
<li class='name'>
Sara
</li>
var names = []
var elm = document.getElementsByClassName('name');
for(var i = 0; i < elm.length; i++) {
names.push(elm[i].innerHTML);
}
names.join();
alert(names);
here is jsfiddle running example https://jsfiddle.net/9pt0hf0s/1/
I have to embed some tracking code on my site. So I have a list of LI elements with an ID value that I want to place inside an array of the snippet. They should be numeric like, 123, 456, etc inside an object. I want to do it in pure JavaScript.
This is my code I have tried. My HTML:
<ul id="itemGrid">
<li class="item" id="1080"> product code </li>
<li class="item" id="1487"> product code </li>
<li class="item" id="1488"> product code </li>
...
</ul>
This is the JavaScript code
// Get all LI items and get the ID of them in the object viewList
var catId = document.getElementById('itemGrid').getElementsByTagName('li');
window.criteo_q = window.criteo_q || [];
window.criteo_q.push(
// SHOULD BE LIKE THIS
// { event: "viewList", item: ["First item id", "Second item id", "Third item id"] }
// My actual code
{ event: "viewList", item: [ catId[].id ] }
);
try this
var lis = document.getElementById('itemGrid').getElementsByTagName('li');
var idArray = [];
for ( var counter = 0; counter < lis.length; counter++)
{
idArray.push( lis[ counter ].id );
}
console.log( idArray );
You can use querySelectorAll to select all the matching elements passed as selector.
The selector '#itemGrid li[id]' will select all the <li> elements inside #itemGrid element having id attribute on it.
The querySelectorAll returns a collection of HTML elements. Iterate over this collection to get the individual element id.
var lis = document.querySelectorAll('#itemGrid li[id]');
var arr = [];
for (var i = 0; i < lis.length; i++) {
arr.push(+lis[i].id);
}
console.log(arr);
document.write('<pre>' + JSON.stringify(arr, 0, 4) + '</pre>');
<ul id="itemGrid">
<li class="item" id="1080">1080</li>
<li class="item" id="1487">1487</li>
<li class="item" id="1488">1488</li>
</ul>
<hr />
You can convert your HTMLCollection to an Array by passing it through slice, and you can then map that array:
catId = Array.prototype.slice.call(catId).map(function(li) { return li.id; });
var catId = document.getElementById('itemGrid').getElementsByTagName('li');
catId = Array.prototype.slice.call(catId).map(function(li) { return li.id; });
document.write(catId);
<ul id="itemGrid">
<li class="item" id="1080"> product code </li>
<li class="item" id="1487"> product code </li>
<li class="item" id="1488"> product code </li>
</ul>
var lis = document.getElementById('itemGrid').getElementsByTagName('li');
var arr = [];
// You need to iterate the list lis
[].forEach.call( lis, function(el){
arr.push( el.id );
});
// Making the object you want
var criteo_q = { event: "viewList", item: arr };
console.log(criteo_q);
To iterate the list of DOM elements, you can also use
Inside html dom I have following structure
<div id="myTitles">
<ul>
<li>
Title:<title>A</title><br>
Second title: <secTitle>B</secTitle><br>
Third title: <thirdTitle>3</thirdTitle>
</li>
<hr>
<li>
Title:<title>B</title><br>
Second title: <secTitle>C</secTitle><br>
Third title: <thirdTitle>9</thirdTitle>
</li>
</ul>
</div>
Number of list elements inside ul of myTitles div is unknown on runtime. So I'm taking var nrOfTitles = $('#myTitles ul li').length; to determine how many is there.
Now, I want to create some simple javascript object which will hold those values (stored inside this semantic tags (title, secTitle, thirdTitle)) and store them inside js array.
var items = $("#myTitles > ul > li");
var arr = [];
items.each(function(){
arr.push([$(this).find("title").text(),$(this).find("secTitle").text(),$(this).find("thirdTitle").text()])
})
With your current combination of <li>s it would contain:
[["A","B","3"],["B","C","9"]]
Or you can store the properties as objects:
var items = $("#myTitles > ul > li");
var arr = [];
items.each(function(){
arr.push({title:$(this).find("title").text(),secTitle:$(this).find("secTitle").text(),thirdTitle:$(this).find("thirdTitle").text()})
})
Then you would get
[{title:"A",secTitle:"B",thirdTitle:"3"},{title:"B",secTitle:"C",thirdTitle:"9"}]
You can use $.fn.map method to conveniently create an array of objects:
var obj = $('#myTitles ul li').map(function() {
return {
title: $(this).find('title').text(),
secTitle: $(this).find('secTitle').text(),
thirdTitle: $(this).find('thirdTitle').text()
};
}).get();
alert(JSON.stringify(obj, null, 4));
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="myTitles">
<ul>
<li>
Title:<title>A</title><br>
Second title: <secTitle>B</secTitle><br>
Third title: <thirdTitle>3</thirdTitle>
</li>
<hr>
<li>
Title:<title>B</title><br>
Second title: <secTitle>C</secTitle><br>
Third title: <thirdTitle>9</thirdTitle>
</li>
</ul>
</div>
But since you are using custom tags in HTML, remember to create them for IE8, if you plan so support this browser, like document.createElement('title');.
I want to append the <li> from one <ul> to another <ul> that's created on the fly. I want to group the list-items into new sub-lists based on their data-group attribute.
<ul id="sortable1">
<li data-group="A">test</li>
<li data-group="A">test1</li>
<li data-group="B">test2</li>
<li data-group="B">test3</li>
<li data-group="C">test4</li>
</ul>
Basically I'm trying to loop through this list and grap all <li> from each group, and then move it to another <ul>.
This is what I have so far, but I'm not getting the expected results. I have done this in Excel in the past but can't get it to work with jQuery.
var listItems = $("#sortable1").children("li");
listItems.each(function (idx, li) {
var product = $(li);
//grab current li
var str = $(this).text();
if (idx > 0) {
//append li
str += str;
if ($(this).data("group") != $(this).prev().data("group")) {
//I should be getting test and test1.
//but alert is only giving test1 test1.
alert(str);
//need to break into groups
//do something with groups
}
}
});
How about something like this:
$(function() {
var sortable = $("#sortable1"),
content = $("#content");
var groups = [];
sortable.find("li").each(function() {
var group = $(this).data("group");
if($.inArray(group, groups) === -1) {
groups.push(group);
}
});
groups.forEach(function(group) {
var liElements = sortable.find("li[data-group='" + group + "']"),
groupUl = $("<ul>").append(liElements);
content.append(groupUl);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul id="sortable1">
<li data-group="A">test</li>
<li data-group="A">test1</li>
<li data-group="B">test2</li>
<li data-group="B">test3</li>
<li data-group="C">test4</li>
</ul>
<div id="content">
</div>
I hope I didn't misunderstand you.