How to change image to next one in hbs handlebars, nodejs with multer - express-handlebars

Question

I am building a classified ads website (like craigslist) with: handlebars (hbs), nodejs and multer for uploading images.
I have already created my own CRUD.
Users could post their ads for free, introducing their info for each ad:
user name
email
ad title
ad description
ad city
ad category
ad images (more than one if user needs)
I have a view, list.hbs, where ads show its information:
When users clicks on ad pictures, it will open like a modal box / pop up:
Everything perfect until here.
I save pictures in my ad.model, through multer like this:
image: {
imgName:{
type:String
},
imgPath:{
type:[String]
}
}
As you can see, I store path's pictures in an array to my mongodb database (managed by mongoose).
I.e:
"image" : {
"imgPath" : [
"uploads/e3c97fb10dd4c602054bedce194464b6",
"uploads/302fe7e147932d2b868a79b1799ba3f9"
]
}
The problem is here. I 've been trying to change image after clicking in each picture and it is impossible to do it.
I have tried via , but it looks like hbs doesn't work properly and don't read variables from handlebars:
I even tried passing through helper via onclick = myfunction({{#imageHelper}}{{/imageHelper}}), but it doesn't work...
Anybody knows how to handle this in handlebars? How to add js code to this view?
Note: my modal box / pop up is made it with pure html / css, no js or jquery in there.

Answer 1

I can't believe my mistake, how I didn't noticed before!
If you reach this question, or any question linked to handlebars - multer - javascript DOM, please, don't forget that template variables inside an onclick element MUST be quoted.
Mistake / Error
I passed through onclick element this:
<img onclick="myFun({{ad.reference}},{{ad.image.imgPath}})" class="imgAd" id="{{ad.reference}}" src="{{ad.image.imgPath.[0]}}"/>
And to manage the src and change images clicking everywhere on the image, I tried to do this:
...
<script>
let i = 0;
//next prev image
function myFun(ref,str){
const arr = str.split(',');
const len = arr.length;
if(i < len - 1){
i = i + 1;
document.getElementById(ref).src = arr[i]
}
else {
i = 0;
document.getElementById(ref).src = arr[i]
}
}
</script>
(This script above, just for change next picture, and so on)
Remember: if you pass variables like that, not quoted, js will throw errors, because it receives a "variable" like parameter, not a string.
In this case onclick received this:
uploads/b5e01da1707382ed915f314c0c77266c //variable, not string
Correct way:
<img onclick="myFun('{{ad.reference}}','{{ad.image.imgPath}}')" class="imgAd" id="{{ad.reference}}" display="block" src="{{ad.image.imgPath.[0]}}"/>
I passed a string, not a variable:
After I quoted each handlebar variable, I passed as string.
"uploads/b5e01da1707382ed915f314c0c77266c"
Now, the script will works. I get a string that I need to transform in an array to handle it:
<script>
let i = 0;
//next prev image
function myFun(ref,str){
const arr = str.split(',');
const len = arr.length;
if(i < len - 1){
i = i + 1;
document.getElementById(ref).src = arr[i]
}
else {
i = 0;
document.getElementById(ref).src = arr[i]
}
}
</script>
With this, I was able to manage DOM in each ad, changing images after clicking with nodejs, hbs and multer.