How to get query string parameters from a url [duplicate] - javascript

This question already has answers here:
How can I get query string values in JavaScript?
(73 answers)
Closed 8 years ago.
How to to get query string parameters from a url
Sample Input -
www.boom.com/?frontend=true&challenge=false
Sample Output -
frontend = true
challenge = false


You could use
String frontEnd=request.getParameter("frontend");
String challenge=request.getParameter("challenge");
to get the values and then use/show them

Related

Javascript converting string to number and formatting [duplicate]

This question already has answers here:
How to convert string into float in JavaScript?
(9 answers)
Closed 1 year ago.
So I'm getting this string '41803.96000000'
what i want to do is convert this to a number and it should be in the
right format such as this example '41.96000000'
for anyone wondering this is the current bitcoin price which I'm getting from a binance WebSocket

You can use parseFloat('41803.96000000')

Does PHP have equivalent string length function than JavaScript's string length function? ("🤦🏼‍♂️".length === 7, int(5), int(17)) [duplicate]

This question already has answers here:
Why PHP strlen() and Javascript xxx.length is not equal?
(6 answers)
How to count the correct length of a string with emojis in javascript?
(9 answers)
Closed 2 years ago.
Please see this example:
In JavaScript
console.log('🤦🏼‍♂️'.length) // 7
In PHP
<?php
var_dump(strlen("🤦🏼‍♂️")); // int(17)
var_dump(mb_strlen("🤦🏼‍♂️")); // int(5)
How can I make sure my backend count my string length exactly as my frontend?

Regular expression, get data from base64 [duplicate]

This question already has answers here:
How to strip type from Javascript FileReader base64 string?
(5 answers)
What do 'lazy' and 'greedy' mean in the context of regular expressions?
(13 answers)
Closed 3 years ago.
I have a base64 data
data:application/pdf;base64,JVBERi0xLj........
I want to get the rest of the data like
JVBERi0xLj........
Following not working, wonder what is the correct approach?
const express = /data:(.*?);base64,(.*?)/g;
const arr = express.exec(base64);

You can simplify and match all the data uri standard :
:([^;]*)[^,]+,(.*)
Your Regex will not match other data urls that are also standard like :
data:text/vnd-example+xyz;foo=bar;base64,R0lGODdh.
data:text/plain;charset=UTF-8;page=21,the%20data:1234,5678

string escaping in json object [duplicate]

This question already has answers here:
How should I escape strings in JSON?
(18 answers)
Closed 3 years ago.
I have this object that I send in response as json.
{"__type":"http:\\/\\/example.com\\/contracts\\/documents\\/rendering\\/instructions\\/1\\/0"}
I want response to be:
{"__type":"http:\/\/example.com\/contracts\/documents\/rendering\/instructions\/1\/0"}
but I get this:
{"__type":"http:\\/\\/example.com\\/contracts\\/documents\\/rendering\\/instructions\\/1\\/0"}
How do I escape string correctly, so I can get response string with only one backslash?

Do this:
let str='{"__type":"http:\\/\\/example.com\\/contracts\\/documents\\/rendering\\/instructions\\/1\\/0"}'
let result = str.replace(/\\/g,'\\');

Get parameters from URL after # tag [duplicate]

This question already has answers here:
How can I get query string values in JavaScript?
(73 answers)
Closed 7 years ago.
How can I get Parameter values from url after # tag? for example, I have the url like this
1) index.html#page=home
2) index.html#page=topic?secid=1&catid=1
from above urls, i have to get parameter values of page, secid and catid.

To get all of the text, you can use window.location.hash, including the hash symbol. Here's some information about parsing query string parameters.

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