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How to get the dimensions of Base64-encoded image in JavaScript [closed]

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I have a REST API return a Base64-encoded image:
API response
Is there a way to get dimensions (height, width) of this image?

You can create an Image object with the given src and directly access the width and height properties.
let url = 'data:image/png;base64,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';
// same image as https://via.placeholder.com/50x50
let img = new Image();
img.src = url;
img.onload = function() {
console.log(img.width, img.height);
}
document.body.append(img); // just for demonstration

Converting a javascript string into an existing javascript variable [closed]

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I am stuck with this problem. I have a function to accept the path and also the same time I have a variable that I want to condition with.
Here is my problem: I want to make a string type that will act as an access to my variable.
In my situation, I have a roles.operation variable which I want to access it dynamically.
The roles variable has an array with the values of:
roles.operations = ['document','article','document-type'];
with this variable I want this to be access dynamically.
Here is what I've tried, which in replacePath i have the value of document-type:
export const createVariable = (roles,path) => {
const replacePath = path.replace(/-/g,"_");
const finalPath = window[`roles.operations.${replacePath}`];
console.log(finalPath);
}
this gives me undefined.

Try this way:
const finalPath = window['roles']['operations'][replacePath];
or
const finalPath = window.roles.operations[replacePath];

Why does JSON.parse() add numbers in front of elements? [closed]

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I have a string where I build my build my "json-like" format, like
_toBeFormated =
[
{"foor":"bar","foo":"bar","foo":["bar,bar"]},
{"foor":"bar","foo":"bar","foo":["bar,bar"]},
{"foor":"bar","foo":"bar","foo":["bar,bar"]}
]
But after calling JSON.parse like _afterFormat = JSON.parse(_toBeFormated), my structure looks like the following:
_afterFormat =
0:{"foor":"bar","foo":"bar","foo":["bar,bar"]},
1:{"foor":"bar","foo":"bar","foo":["bar,bar"]},
2:{"foor":"bar","foo":"bar","foo":["bar,bar"]}
If I try to change to JSON Format at the beginning, like leaving out [ ], if failes to parse, also it looks like valid JSON to me. What am I missing, or why does it add the numbers at the beginning?

It doesn't add numbers. The data structure is an array. The tool you are using to look at the array is showing the index of each entry.

How to get hold of a part of dynamically generated URL [closed]

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I'm using filestack, when ever I upload an image it creates an unique url for the uploaded Image. I want to get hold of a specific part of a url to a variable.
https://www.filestackapi.com/api/file/qiXTZ0dQUGPQRG4GH0Cy
https://www.filestackapi.com/api/file/"qiXTZ0dQUGPQRG4GH0Cy"
The above Url belongs to an image, but I want get hold of the quoted part to a variable, how to do that?

You can search for the last index of / in the url then make a substring of the url starting from that point.
var url = 'https://www.filestackapi.com/api/file/qiXTZ0dQUGPQRG4GH0Cy';
var lastIndex = url.lastIndexOf("/");
var searched = url.substring(lastIndex + 1);
// searched = qiXTZ0dQUGPQRG4GH0Cy

How to make the following JavaScript code work and result in a list of names and ages inside the element with ID "myDivId" : [closed]

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How to make the following JavaScript code work and result in a list
of names and ages inside the element with ID "myDivId" :
<div id="myDivId">No results yet</div>
<script>
new PersonPrinter("myDivId",[{"name":"Joe","age":"23"}
{"name":"Sam","age":"31"}]).render();
</script>`

In the PersonPrinter render function you need to update the div
PersonPrinter.prototype.render = function(id,data) {
var elem = document.elementById(id);
for (var i =0;i <data.length;i++) {
var d = dcoument.createElement('div');
d.appendChild(document.createTextNode('Name'+data.name +' Age:'+data.age');
elem.appendChild(d);`enter code here`
}
}

You need to access div id using innerHTML
var a = Document.getElementById('myDinId');
And for changing value use simply = operator
a.innerHTML = 'Something';