How to point elements childrens with JavaScript - javascript

I have little problem with element childrens.
Heres some code to explain my question:
function check(element){
// I want to get custom attribute from element children.
// Children elements are always radio buttons
var temp = element. ?? .attr('temp');
return temp;
}
// element variable is the whole div here
<div id = "test">
<table>
<tr>
<td> <input type="radio" temp="somethinghere"/></td>
</tr>
</table>
</div>
Hope someone has ideas or even better.. solution.

I think you want something like this:
function check(element) {
var ret = [];
for (var i = 0; i < element.childNodes.length; i++) {
if (element.childNodes[i].type == 'radio') {
ret.push(element.childNodes[i].getAttribute('temp'));
}
}
return ret;
}
This will return an array containing all the temp attributes of the radio children of the element.

var temp = element.getAttribute('temp')
Or
var temp = element.temp = temp;
Or
var temp = element['temp'] = temp;
https://developer.mozilla.org/en/DOM/element.getAttribute
Edit: try:
var temp = '';
for (var i = 0; i < element.childNodes; i++)
temp += element.childNodes[i].getAttribute('temp');
return temp;
Is this what you're looking for?

To get an array of all the children of element :
element.childNodes;
To get an array of all input tags that are descendants of element :
element.getElementsByTagName("input")
Then loop through either of those arrays.

try this for the first child radio button
var temp = element.children(':radio:first').attr('temp');
of if you want all 'temp' attr from all child radio button do following:
var arrTemp = element.children(':radio').map(function(){
return $(this).attr('temp');
// or you can make it more detail like:
// return { ID: $(this).attr('id'), Temp: $(this).attr('temp') };
}).get();
UPDATE for table sample
var arrTemp = element.find(':radio').map(function(){
return $(this).attr('temp');
// or you can make it more detail like:
// return { ID: $(this).attr('id'), Temp: $(this).attr('temp') };
}).get();

Related

javascript dynamically adding and removing classes [duplicate]

This question already has answers here:
How can I change an element's class with JavaScript?
(33 answers)
Closed 5 years ago.
I am working on a simple example, if a user clicks on element then all the elements above it should have a class and all elements below it should not have any class applied to them.
Here is my code:
<script>
function test(object) {
var pid = object.id;
var id = parseInt(pid.split("")[1]);
console.log(id);
for (var i = 1; i <= id; i++) {
var element = document.getElementById("p"+i);
console.log(element);
element.className = "active";
}
console.log(id+1);
for(var i = id+1; i <= 4; i++) {
var element = document.getElementById("p"+i);
element.className.replace(new RegExp('(?:^|\\s)'+ 'active' + '(?:\\s|$)'), ' ');
console.log(element);
}
}
</script>
<div id="divid">
<p id="p1" onclick="test(this)">one</p>
<p id="p2" onclick="test(this)">two</p>
<p id="p3" onclick="test(this)">three</p>
<p id="p4" onclick="test(this)">four</p>
</div>
So here if I click on three then the elements for one, two, three should have the class active and element four should not have any class. This is working fine.
Now if I click on one, I am expecting that two, three, four should have any css class but it is not working like that.
Can you please help me where is the issue. I want to use plain Javascript.
It might be wise to consider an alternative to using the onclick attribute due to separation of concerns. The following allows you to alter the HTML without having to consider JavaScript while you work.
https://jsfiddle.net/gseh0wxc/2/
var getList = (selector) => [].slice.call(document.querySelectorAll(selector));
var paragraphs = getList("#divid p[id ^= 'p']");
paragraphs.forEach((paragraph, index) => {
paragraph.addEventListener('click', (e) => {
for (let i = 0; i < index; i++) {
paragraphs[i].classList.remove('active');
}
for (let i = index; i < paragraphs.length; i++) {
paragraphs[i].classList.add('active');
}
});
})
Please try this code
function test(object) {
var pid = object.id;
var id = parseInt(pid.split("")[1]);
console.log(id);
for (var i = 1; i <= id; i++) {
var element = document.getElementById("p"+i);
element.classList.add("active");
}
console.log(id+1);
for(var i = id+1; i <= 4; i++) {
var element = document.getElementById("p"+i);
element.classList.remove("active");
}
}
Hope this helps.
try this simple approach instead, don't need to extract id number and all, and with a single simple loop.
function test(option) {
//this will select all p tags id starts with "p" inside div having id "divid" and return a array
var targetPTags = document.querySelectorAll("div#divid p[id^=p]")
var idx, flag=false;
//we are iterating over that array and taking each dom element in el
for(idx=0;idx<targetPTags.length;idx++) {
var el = targetPTags[idx];
if(flag) {
//do operation you want for after elements in el
} else if(option===el) {
flag=true; // we are making flag true when its the element that clicked and doing no operation
//do the operation you want for the element, may be the same as below operation in else
} else {
//do operation you want for before element in el
}
}
}
Kind of similar to "Chatterjee"'s solution, but here you go:
function test(object)
{
var parentElem = null;
var childElems = null;
var currElemSet = false;
var i=-1;
try
{
parentElem = object.parentElement;
if(parentElem!=null)
{
childElems=parentElem.getElementsByTagName(object.nodeName); // could refine to accommodate sibling nodes only
if(childElems!=null)
{
for(i=0;i<childElems.length; i++)
{
if(currElemSet) childElems[i].className = "";
else childElems[i].className = "active";
if(childElems[i]==object) currElemSet = true;
}
}
}
}
catch(e)
{
alert("Error: " + e.Message);
}
finally
{
}
}

JS - combining array items together in one item

For example I want to collect some tags (lets say paragraph):
var tagsCollection = document.getElementsByTagName('p');
var tagsCollectionLength = tagsCollection.length
I loop through (iterate):
for (var i = 0; i < tagsCollectionLength; i++)
{
//get an array:
var tagsCollectionArray = tagsCollection[i];
}
Now what to do to get all array items as ONE item:
so it won't looks like:
[paragraph1, paragraph2, paragraph3]
but like:
[paragraph1paragraph2paragraph3]
I did try join. concat. etc. without success probably I'm doing something wrong, any help is appreciated. Thanks.
you can keep a variable outside the for, append the strings inside for and when for finishes, push it inside an array.
Here's how to do that -
var tagsCollection = document.getElementsByTagName('p');
var tagsCollectionLength = tagsCollection.length;
var tags = "", tagsCollectionArray = [];
for (var i = 0; i < tagsCollectionLength; i++)
{
tags = tags + tagsCollection[i];
}
tagsCollectionArray.push(tags);
Suppose you have this html
<div>
<p>a</p>
<p>b</p>
<p>c</p>
<p>d</p>
<p>e</p>
</div>
Assuming the result you want is an Array of all the paragraphs's content ([paragraph1paragraph2paragraph3]), then you could do the following:
tagsCollection = document.getElementsByTagName('p');
var ar = [];
for(var i = 0; i < tagsCollection.length; i++ ) {
ar.push(tagsCollection[i].innerText)
}
console.log([ar.join('')]) // => ["abcde"]
See this fiddle
As I have already commented, you can use Array.join("").
JSFiddle.
(function() {
var data = [];
var str = [].map.call(document.getElementsByTagName('p'), function(item) {
return item.innerHTML;
}).join("");
data.push(str);
document.write("<pre>" + JSON.stringify(data) + "</pre>");
})()
<p>hello</p>
<p>workd</p>
<p>test</p>

mapping Json data and adding data attr

I have a difficulty with mapping my my Json data. I would like to add data attr to each div with .name class. So as the result is like that:
<div class="name" data-key="sth"> sty</div>
Key can be got like that: ['streme'].key
here is my buggy JS:
function getExistingLinks() {
$.post( "http://0.0.0.0:9292/api/links", function( data ) {
var names = data.map(function (i) {
return i['link'].name
});
var keys = data.map(function (i) {
return i['link'].key
});
var container = document.querySelector(".link-names");
names.forEach(function(name) {
var div = document.createElement('div');
div.innerHTML = name;
$('div').addClass("name");
// $('div').each( function(index) {
$('div')[index].data("key") = keys[index];
}
container.appendChild(div);
});
});
return false;
}
names.forEach(function(name,index) {
var div = document.createElement('div');
div.innerHTML = name;
$(div).addClass("name");
$(div).data("key") = keys[index];
});
You need to remove the quotes in the $() selector!
As per your comment, may be try doing like:
var i = 0;
names.forEach(function(name) {
var div = document.createElement('div');
div.innerHTML = name;
$('div').addClass("name");
$('div').data("key", keys[i]);
container.appendChild(div);
i++;
});
the preferred method is to only add to the DOM once, as adding to the DOM will cause a redraw on each.
psuedo code as not sure what name represents in your innerHTML:
var divs = [];
for (var i, len = names.length; i < len; i++) {
divs.push($(''+name+'').data("key", keys[i]));
}
$container.append(divs);
http://codepen.io/jsdev/pen/2866265243563efd79cf05a5b12202b3
try something like this
$('.name').data('key') //will give you sth

Get the list of attributes of a HTML string using Javascript

How can I get the list of attributes of an HTML string using Javascript? Here's my code so far.
function traverse_test(){
var root=document.getElementById('arbre0').childNodes;
for(var i=0;i<root.length;i++){
var lis = root[i];
if (lis =='[object HTMLUListElement]') {
for (var member in lis) {
if (typeof lis[member] == "string") {
var assertion = lis[member];
var resultat = assertion.search(/..Bookmarks/);
if (resultat != -1) {
output.innerHTML+= lis[member];
// Here I'd like to have the list of lis[member] attributes
for(var attr in lis[member].attributes) {
output.innerHTML+=lis[member].attributes[attr].name + "=\""+ lis[member].attributes[attr].value + "\"";
}
break;
}
}
}
}
}
}
Use the Node.attributes property of a DOM element. Example:
var foo = document.getElementById('foo'),
attrs = foo.attributes,
i = attrs.length,
attr;
while (i--)
{
attr = attrs[i];
console.log(attr.name + '="' + attr.value + '"');
}
Demo: http://jsfiddle.net/mattball/j8AVq/
Seems like all these answers point to how to get an attr list from a node but the question asks for attrs from an HTML string. Here is my 2cents.
//turn your string into a node and get your html strings NamedNodeMap
var temp = document.createElement("div");
temp.innerHTML = "<div attr-1 attr-2 attr-3 attr-4></div>";
temp = temp.firstElementChild.attributes;
//put the attributes in a an array
var list = Object.keys(temp).map( function( index ) { return temp[ index ] } );
console.log( list );
If you know the attributes to get the value you can do:
var MyValue = document.getElementById("myimage").getAttribute("src")
In JavaScript to loop all attributes:
var el = document.getElementById("someId");
var arr = [];
for (var i=0, attrs=el.attributes, l=attrs.length; i<l; i++){
arr.push(attrs.item(i).nodeName);
}
The above code was taken from this question
Jquery might be another option:
http://plugins.jquery.com/project/getAttributes
[].slice
.apply(document.querySelector('something').attributes)
.forEach(function(item){
console.log(item, item.name, item.value);
});

Get each Attribute of element in loop function

I have a HTML DIV element:
<div class="obj" height="this is attr 1" rel="this is att2" width="this is att3"></div>
I've a new Variable: attArray:
var attArray = new Array();
I want to get step by step each att in div.obj into attArray. How do I do it?
attArray[0] = "this is attr1"
attArray[1] = "this is attr2"
attArray[2] = "this is attr3"
Each element already has an attributes-collection, you can access it like an array.
Simple:
$('.obj').each(function() {
var attArray = [];
for(var k = 0; k < this.attributes.length; k++) {
var attr = this.attributes[k];
if(attr.name != 'class')
attArray.push(attr.value);
}
//do something with attArray here...
});
Working example

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