Get DOM element that has been created within a foreach loop - javascript

I have a node application and I have a pug template that are coded up, the pug template represents one project, and within that are shown related targets (so a one to many relationship - one project can have many targets).
What I want to do, is have a user be able to click on the DOM element representing a target, and it open up a modal form or something similar, and allow it to be edited. I'm not sure of the best way to do this. So this is my pug template element for each:
each target in project.targets
.target__card
.target__avatar
h6.target__title= target.title
input#targetId(type='hidden' value=`${target._id}`)
So I've got my hidden id in there and it's all peachy. I want to be able to click on it and it open a form that can edit it and then submit to my endpoint. But if I have a javascript function like this:
const targetCard = document.querySelector('.target__card')
if (targetCard) {
targetCard.addEventListener('click', async (e) => {
const target = document.getElementById('targetId').value
console.log('target is ', target)
})
}
then this is only going to work for the first DOM element. But do I really need to loop through again, in my javascript, or something like that? I'm already looping in the template, and the information is ' just sitting there' already, I can see it. It seems wasteful to loop through it again in a js function, even if I did know the best way to do that (which I'm not sure I do). Is there something obvious that I'm missing? Can I embed a form in each element that can simply be hidden and unhidden? That seems a bit wasteful too.

Related

Can this popup feature be applied for many users?

I made a popup feature, which shows the phone number of a user. I was able to apply this feature to one instance. A single user.
Normally, each user has a unique phone number. Each user's number's already embedded, it's just to reveal the numbers, for multiple users.
But then, I thought, what if I have lots of users as they come, to the site? How do I dynamically apply the same popup feature without writing the same lines of code I wrote for the single user, over and over again?
Please, help me out.
This is the JavaScript I wrote...
let tansform_scale_0 = document.querySelector('.transform_scale_0');
let num_btn = document.querySelector('.num_btn');
num_btn.addEventListener('click', ()=>{
if (!tansform_scale_0.classList.contains('scale_to_1')) {
tansform_scale_0.classList.add('scale_to_1');
} else {
tansform_scale_0.classList.remove('scale_to_1');
}
})
Please view the code here: https://codepen.io/matthewdon/pen/MWQEvJM
You need to extend the logic you've applied to each of your cards. For example, the simplest way is to use querySelectorAll rather than the querySelector you currently have.
This is very similar in that it will return you a list of matching elements which you can then loop over and add your event listeners to in much the same way you are doing now.
However to make things a bit easier, you will be better off looping over each of the containing .card elements first. That way you can scope a second querySelector to the containing element and leave the rest of your logic largely intact.
You can shortcut the click handler itself though, by using classList.toggle rather than manually checking the class and then adding/removing it as required.
const cards = document.querySelectorAll('.card');
cards.forEach((card) => {
// rest of your click handler logic
})
Here's a snippet that brings all that together. I've put it on codepen as the editor on here isn't really suited to such a large amount of html: https://codepen.io/29b6/pen/VwQQqrw?editors=1111

Materialize css initializing tabs for each result

I am doing a school project that is a Movie lookup app connected to guidebox API. I am using Materialize CSS and trying to organize the information into their tabs system. They are added dynamically so the documentation says to initialize in javascript. It says to use:
$(document).ready(function(){
$('ul.tabs').tabs();
});
However that doesn't work for me I guess since the tabs are not present at Doc Ready thaey are not pushed into the DOM until a submit request. I put just the
$('ul.tabs').tabs();
into a few places in my code and the best result was it working on the first movie returned on each search but for each subsequent return item the tabs break.
I could use some guidance on whether I can plug that in somewhere to make my existing code work.
https://github.com/jasonboru/group_project1_guidebox.git
There are some missing ending tags in your dynamically created dom elements.
Apart this, in this file assets/js/logic.js the following there are the following two lines:
$('.guidebox-search-results').append(movieResult);
$('ul.tabs').tabs();
That menas, whenever you add new tabs element you initialize them.
The mistake I see is: in this way you initialize every tabs not only the new one. And, because you have already initilized the old one I can suggest you to rewrite the previous two lines in this format:
$('.guidebox-search-results').append(movieResult);
$('.guidebox-search-results').find('ul.tabs').tabs();
You can bind on every event, when node inserted in dom and after that, do with it what you want.
$(document).bind('DOMNodeInserted', function(e) {
var element = e.target;
});

lightbox not working on new content

Hy, I'm having some problems making lightbox (in my case slimbox 2) work
after new content is loaded. I understand that slimbox needs to be called again, but I tried almost everything.
Here is the code how new content is been loaded:
...var link = $('<a class="loadpost" href="javascript:">Load more</a>');
link.click(loadMore);...
loadMore is the function that loads new content. this is just a piece of code. if you need the whole code let me know.
Here is the slimbox code.
jQuery(function($) {
$("a[rel^='lightbox']").slimbox({/* Put custom options here */}, null, function(el) {
return (this == el) || ((this.rel.length > 8) && (this.rel == el.rel));
});
the new content has the rel attributes but it wont work. can i combine the click function from above to call slimbox code again.
Long version:
Without more of the code (if you can, make a jsfiddle or something similar) it's hard to know if this is the only issue, but one immediate issue I'm seeing is that you're using jQuery's $(" ") wrong. You're supposed to put a selector in there, so that jQuery can find whatever it is you want it to find in the DOM; what you're feeding it is a string of HTML.
Browsers use HTML to make the DOM (Document Object Model) tree, which you can think of as an abstracted logic tree of your HTML; the DOM sees 'a.loadpost' as a parent of the text node inside of it (in this case, 'Load more'). CSS and Javascript/jQuery both find information from that abstracted logic tree in pretty similar ways. With a few exceptions, if you know how to target something with CSS, you know how to target it with jQuery -- just select whatever HTML you need to select the same way you would with CSS.
So, to tell jQuery to do something to a link with a class of 'loadpost', you simply write $('a.loadpost'). $("a.loadpost") works as well.
Short version:
var link = $('a.loadmore');

Prototype not defined when accessing children on creation of custom-tag

__What I am trying todo____
Right now I am working with custom HTML5 tags. I am trying to create a tab-control element that is easy to set up. Todo this I create a parent element called 'tab-set' which works much like the 'ul' tag.
To insert tabs, you simply insert 'tab-element' tags (like 'li' tags). The tags can implement own behavior through custom prototypes which extend standardized element-prototypes such as the basic HTMLElement and are then registered with 'document.registerElement()'. At that point there are also opportunities to set callbacks that let you know whenever your element has been created or attached to something, which is what I use to do the necessary calculations on the placement of the individual tabs on the tab-control.
Let me say up-front that I've had trouble with this at first, then got it working, but upon rewriting the whole thing had troubles again for who knows why.
So, in the creation routine of the tab-set I iterate through all the child-tab-elements, calling their custom function 'setDimension', or atleast I am trying to. For some reason Chrome won't initialize the tab-element prototype (setDimension etc) before it has called both 'createdCallback' and 'attachedCallback' on my tab-set. This means that I can't call the child elements custom functions to set it's placement on creation of the tab-set.
Here you have some code samples of what I just described.
simple.html
...
<tab-set>
<tab-element>
<img>guybrush</img>
</tab-element>
<tab-element>
<img>le chuck</img>
</tab-element>
</tab-set>
...
tabs.js
...
tabSet = Object.create(HTMLDivElement.prototype);
tabSet.attachedCallback = function(){
for(/** calculations here **/)
listOfChildren[index].setDimensions(/** placement info **/);
//
// Chrome console: 'setDimensions' is not a function!
//
}
tabElement = Object.create(HTMLDivElement.prototype);
tabElement.setDimensions = function(/** placement info **/){
$(this).css(...);
}
document.registerElement('tab-set',tabSet);
document.registerElement('tab-element',tabElement);
...
The weird thing is that I have a working version of this, and yes, I have tried to emulate it's particular conditions such as for example loading the html-portion through jquery's .load() routine. But no matter what I do, I can not get this to work in my current script. What knowledge am I missing?
Thanks in advance for any help.
__ Solved __
All I had todo was add a link-tag inside the tab-set and have the tab-elements load it's containing style-class. I guess making the tab-elements have a css-class is somehow provoking Chrome to load their prototypes 'prematurely'.

Listen to specific changes on contenteditable?

Warning: not duplicate with existing questions, read through
I know I can have an event listen on changes on an contenteditable element.
What I would like is to be able to know what the changes are.
For example:
inserted "This is a sentence." at position X.
deleted from position X to Y.
formatted from X to Y with <strong>
Is that possible? (other than by doing a diff I mean)
The reason for this is to make a WYSIWYG editor of other languages than HTML, for example Markdown.
So I'd like to apply the changes to the Markdown source (instead of having to go from HTML to Markdown).
You may be able to do something with MutationObservers (falling back to DOM Mutation events in older browsers, although IE <= 8 supports neither) but I suspect it will still be hard work to achieve what you want.
Here's a simple example using MutationObservers:
http://jsfiddle.net/timdown/4n2Gz/
Sorry, but there is no way to find out what the changes are without doing a diff between the original content and the modified one when changes occur.
Are you looking for this
var strong=document.createElement("strong");
var range=window.getSelection().toString().getRangeAt(0);
range.surroundContents(strong);
this was for third part
You just need to select what you want to surround using real User interaction.
If you wanna do it dynamically
var range=document.createRange();
range.setStart(parentNode[textNode],index to start[X])
range.setEnd(parentNode[textNode],index to end[Y])
range.surroundContents(strong);
For 2nd Part
range.deleteContents()
1st part can be done by using simple iteration
var textnode=// node of the Element you are working with
textnode.splitText(offset)
offset- position about which text node splitting takes place[here==X]
Two child Nodes have been created of the parent editable Element
Now use simple insertBefore() on parent editable Element Node.
hope you will find it useful
The API you're looking for does not exist, as DOM nodes do not store their previous states.
The data / events you're wishing to get back are not native implementations in any browser Ive come across, and I struggle to think of a datatype that would be able to generically handle all those cases. perhaps something like this:
function getChanges() {
/* do stuff here to analyse changes */
var change = {
changeType : 'contentAdded',
changeStart : 50, /* beginning character */
changeContent : 'This is a sentence'
}
return change;
}
Since you're trying to get custom events / data, you're probably going to need a custom module or micro-library. Either way, to look at the changes of something, you need somehow be aware of what has changed, which can only be done by comparing what it was to what it is now.

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