HTML + Alternative of Javascript Switch-Case for simple string & Constant [closed] - javascript

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In my Js script, I am using switch case but I dnt want to use it but I am not getting better alternative of this.
Here I am using Js CONSTANT as well for defining First URL & Second URL
var FIRST_URL = "/first_url.html"
var SECOND_URL = "/second_url.html"
& also passing FIRST_URL and SECOND_URL as parameter from function. That's why I used FIRST_URL with double quotes and without quotes.
Snippet :-
if(url == "DIV_ID"){
switch (url_type) {
case FIRST_URL:
case "FIRST_URL":
result = "/first_url.html";
break;
case SECOND_URL:
case "SECOND_URL":
result = "/second_url.html";
break;
default:
result = "other_url.html";
break;
}
}
Suggest something to resolve this.


You can use something like this, but add proper error checking.
Roughtly:
var arr = {};
arr['FIRST'] = 'your first url';
arr['SECOND'] = 'your second url';
result = arr[urlType];


here's an example using object literal:
var arr = {
FIRST : 'your first url',
SECOND: 'your second url'
};
console.log(arr.FIRST)
console.log(arr['SECOND'])
//for adding properties
arr.thr='third prop';
basically the resulting obj is the same to bigmike's answer, but it maybe easier to understand .
This is what is called a key-value pair and the structure is an object (JS definitions).
BTW there is nothing wrong with switch .

Related

Comparing keyword value field in array - Javascript [closed]

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I have keyword (for example -2330) that needs to be compared with the 'values' in this string below.
"[{\"type\":\"A_PRODUCT\",\"value\":[[{\"key\":\"SUBCLASS\",\"value\":\"1574\"}],[{\"key\":\"SUBCLASS\",\"value\":\"2331\"}]]}]";
Expected output needs to be true or false depending if the string has the keyword or not.
How do I check it?

I will do something like this to loop
var a = "[{\"type\":\"A_PRODUCT\",\"value\":[[{\"key\":\"SUBCLASS\",\"value\":\"1574\"}],[{\"key\":\"SUBCLASS\",\"value\":\"2331\"}]]}]";
var new_a = JSON.parse(a);
var value_compare = '1574';
new_a[0]['value'].forEach(element => {
if (element[0].value == value_compare) {
//DO SOMETHING
alert('found: '+ JSON.stringify(element));
}
});

You first need to parse the JSON into an suitable JS structure. Because of the nested nature of the data you need to 1) map over the first object in your array, 2) return the value of the value property of the first object of each and finally 3) check to see if the keyword is included in the the returned array, and return true or false.
const json = '[{\"type\":\"A_PRODUCT\",\"value\":[[{\"key\":\"SUBCLASS\",\"value\":\"1574\"}],[{\"key\":\"SUBCLASS\",\"value\":\"2331\"}]]}]';
const data = JSON.parse(json);
function doesItExist(data, keyword) {
const values = data[0].value.map(arr => arr[0].value);
return values.includes(keyword);
}
console.log(doesItExist(data, '2331'));
console.log(doesItExist(data, 'Bob'));
console.log(doesItExist(data, '1574'));

Javascript: Remove letters outside of two parentesis [closed]

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So, hello. I edited the entire thing.
app.get('/', async (req, res) => {
let results = await db.collection("malwarepad-website").find("6047667ff156cb8135bdaa88").toArray()
//var resultsConverted = results.toString();
//let resultsFinal = resultsConverted.split('"');
console.log(results)
res.render('index.ejs', { startText: results });
})
In the above code I want to only keep the second part of it specified better in this image: https://i.stack.imgur.com/Wi031.png
I want to create a variable containing the following:
Hello, and welcome to my website. I don't know how you found me but yo...
I already have a constant containing the search results, but it is this:
[
{
_id: 6047667ff156cb8135bdaa88,
mainPage: "Hello, and welcome to my website. I don't know how you found me but you're welcome :)."
}
]
Thanks for the understanding :)

a = a.split("\"")[1]

If you mean extracting what's inside double quotations, you have two methods:
1 - Use Regular Expressions:
You can use regular expression /.*"(.*)".*/ which tries to capture everything inside parentheses. You can use exec method. like :
const importantPart = /.*"(.*)".*/.exec(a)[1] (a is your variable)
2 - Using indexOf string methods
In JavaScript strings have two useful methods: indexOf and lastIndexOf. In addition to a substring.
You can use these to extract the important part:
a.substring(a.indexOf('"') + 1, a.lastIndexOf('"'))

There are several solutions. One could be:
const a = 'odshniudfskdjnfdsjnf"Important part"fererferferef';
let a_splitted = a.split('"');
console.log(a_splitted[1]);

You can use regular expressions to extract the part that you need.
const a = 'odshniudfskdjnfdsjnf"Important part"fererferferef';
let result = a.match(/\"(.*)\"/);
console.log(result[1]);
There are a lot of what-ifs though.

const a = 'odshniudfskdjnfdsjnf"Important part"fererferferef';
let regex = /(?<=\")(.*?)(?=\")/;
let result = regex.exec(a)[0];
console.log(result);

How return this data in json for each? [closed]

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i have json values like this, i try to use for each to get the result one bye one, but it was not returning to me
"[{"id":6,"userid":13,"title":"business3","bussinessTypeid":1,"photurl":"","cntry":[{"id":"9","name":"Bahrain"}]},
{"id":7,"userid":13,"title":"business6 arabic","bussinessTypeid":1,"photurl":"","cntry":[{"id":"1","name":"Afghanistan"}]},
{"id":10,"userid":13,"title":"E-commerce","bussinessTypeid":1,"photurl":"","cntry":[{"id":"1","name":"Afghanistan"}]},
{"id":11,"userid":8,"title":"Auto phone parts","bussinessTypeid":1,"photurl":"","cntry":[{"id":"1","name":"Afghanistan"}]},
{"id":19,"userid":8,"title":"التجارة الإلكترونية","bussinessTypeid":1,"photurl":".jpg","cntry":[{"id":"9","name":"Bahrain"}]},
{"id":20,"userid":8,"title":"E-commerce -online shopping","bussinessTypeid":8,"photurl":".jpg","cntry":[{"id":"9","name":"Bahrain"}]},
{"id":21,"userid":13,"title":"My new Business","bussinessTypeid":6,"photurl":".jpg","cntry":[{"id":"9","name":"Bahrain"}]}]"
can anyone guide me to achive this

I think it's being treated as a string try to remove the ( " ) on the start and end of it something like:
var json = [{"id":6,"userid":13,"title":"business3","bussinessTypeid":1,"photurl":"","cntry":[{"id":"9","name":"Bahrain"}]},{"id":7,"userid":13,"title":"business6 arabic","bussinessTypeid":1,"photurl":"","cntry":[{"id":"1","name":"Afghanistan"}]},{"id":10,"userid":13,"title":"E-commerce","bussinessTypeid":1,"photurl":"","cntry":[{"id":"1","name":"Afghanistan"}]},{"id":11,"userid":8,"title":"Auto phone parts","bussinessTypeid":1,"photurl":"","cntry":[{"id":"1","name":"Afghanistan"}]},{"id":19,"userid":8,"title":"التجارة الإلكترونية","bussinessTypeid":1,"photurl":".jpg","cntry":[{"id":"9","name":"Bahrain"}]},{"id":20,"userid":8,"title":"E-commerce -online shopping","bussinessTypeid":8,"photurl":".jpg","cntry":[{"id":"9","name":"Bahrain"}]},{"id":21,"userid":13,"title":"My new Business","bussinessTypeid":6,"photurl":".jpg","cntry":[{"id":"9","name":"Bahrain"}]}];
Then do the iteration:
for(id in json){
alert(json[id]['id']);
}
and don't include any next line spaces are ok as long as they are separated by a comma (,)

Use parseJson()
Description: Takes a well-formed JSON string and returns the resulting
JavaScript object.

$.each(data, function(key, value){
console.log(value.id, value.title);
$.each(value.cntry, function(key2, value2){
console.log(value2.id, value2.name);
})
});
Try this with jquery
var data = jQuery.parseJSON(yourJsonInString); //or this parser below
var data = JSON.parse(yourJsonInString);

How to use string without double quotes around it via Javascript? [closed]

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I have a very small problem but couldn't find the solution despite of 2 hours of searching.
What I have is a simple javascript variable which is
var route_name = db.FIELD_ROUTE_NAME;
and in another javascript file
var db = {
FIELD_ROUTE_NAME: "fld_route_name",
// another js constants
};
As you can see, route_name equals to "fld_route_name" (with quotes around because it's string, I know)
Is there any way I can use this without double quotes around, like just fld_route_name ?
EDIT:
messages: { // custom messages for radio buttons and checkboxes
fld_route_name: {
required: localize("at_least_5_characters"),
},

Is there any way I can use this without double quotes
Yes, you can use simple quotes:
var db = {
FIELD_ROUTE_NAME: 'fld_route_name',
// another js constants
};
But you can't do
var db = {
FIELD_ROUTE_NAME: fld_route_name,
// another js constants
};
if fld_route_name variable is not defined.
Example:
var fld_route_name = "fld_route_name"; // the quotes still appear here
var db = {
FIELD_ROUTE_NAME: fld_route_name,
// another js constants
};

If you don't have quotes around it, then it isn't a string literal but becomes an identifier instead. In that context, an identifier is a variable.
You can avoid the quotes if you define a suitable variable first.
var fld_route_name = "fld_route_name"
var db = {
FIELD_ROUTE_NAME: fld_route_name,
// another js constants
};
Or you could use single quotes instead of double quotes.
var db = {
FIELD_ROUTE_NAME: 'fld_route_name',
// another js constants
};

Regex like parameter function in Javascript [closed]

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I will do a function with parameters that get a regex and check the field of a form with it.
I have this code:
//The first function handler (no one runs):
field.onblur = function(){
checkField(0, /^([a-z ñáéíóúü]{2,60})$/i, "name", "nameError", "Error in name");
}
//The function:
function checkField(numForm, regex, idField, idError, error){
var form = document.getElementsByTagName("form")[numForm];
var field = form.getElementById(idField);
var spanError = form.getElementById(idError);
//Since here runs, so I think the problem is with the regex
if(!regex.test(idField.value))
spanError.innerHTML = error;
else
spanError.innerHTML = "";
}
What is the proper way to make a function and give it a regex like a parameter?

The regexp is passed fine, these two lines are erranous instead:
var field = form.getElementById(idField);
var spanError = form.getElementById(idError);
getElementById() is a method of document only. You can fix the issue by using id string like below:
var field = form[idField];
var spanError = form[idError];
... or using getElementById(): var field = document.getElementById(idField);
Also this line (unless a typo in the post)
if(!regex.test(idField.value))
should be:
if(!regex.test(field.value))

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