This question already has answers here:
JavaScript property access: dot notation vs. brackets?
(17 answers)
Add a property to a JavaScript object using a variable as the name? [duplicate]
(14 answers)
Closed 7 months ago.
I have a flexible amount of titles, aka title1, title2, title3 etc. How can i create a dynamic variable that gives me the value of that field?
function getTitle(i){
var myScope={}
myScope["title"+i]="title"+i // should i use this in any way, and how?
var output = props.attributes.title1 // This works, but it is static. Instead the 1, add the value of i here like:
var output = props.attributes.title+i
return output
}
I would like to concatenate the value of i to the word 'title'. So it becomes title1 or title2 etc.
You can make it dynamic like this
var output = props.attributes[`title${i}`];
If I understood your question right you can use template literals.
function getTitle(i) {
let title = 'myTitle'
let output = `${title} ${i}`
console.log(output)
return output
}
getTitle('concated')
Related
This question already has answers here:
How to check if object property exists with a variable holding the property name?
(11 answers)
How to use a variable for a key in a JavaScript object literal?
(16 answers)
Closed 5 years ago.
I'm attempting to run a list of strings through an object. When I do it individually it works, but when I pass it through as a string it doesn't work. How would I fix this?
// this doesn't work
var a = "IntegrationItem1";
var data = faq.a;
// but this works
var data = faq.IntegrationItem1;
What's causing the first example to not work? Is the variable data seeing it as faq."IntegrationItem1" instead of faq.IntegrationItem1?
You can access properties of the object using it's names:
var a = "IntegrationItem1";
var data = faq[a];
what you need is faq["IntegrationItem1"] => faq[a]
This question already has answers here:
Convert string to variable name in JavaScript
(11 answers)
Closed 6 years ago.
A javascript newbie question:
Let's say, there is a variable defined as follows:
var var1 = "Something"
On the other hand, I generate such strings (simplified):
var nmbr = "1"
var varname = "var" + nmbr
Now I have to get the value of a variable with such a name (varname as string).
document.write([???varname???])
should write 'Something'.
How to do this?
console.log(variable_name);
will print the variable in the console.
This question already has answers here:
JavaScript object: access variable property by name as string [duplicate]
(3 answers)
Closed 8 years ago.
Please explain, why this code it's not allowed in javascript and how to make it.
var p = "inputText";
regError.p
This will give me undefined but
regError.inputText
will give me a correct result.
You can do it by using bracket notation:
regError[p]
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_Accessors
If you have an object like this
var regError = {
inputText : 'something'
}
and you want to access it with a variable, you'll have to use bracket notation
var p = "inputText";
var result = regError[p]; // returns "something"
Use with bracket notation:
regError[p]
You can check the difference between them here and there
This question already has answers here:
Is there a way to access a javascript variable using a string that contains the name of the variable?
(4 answers)
How to use a string as a variable name in Javascript? [duplicate]
(3 answers)
parse a string as an object from data attribute [duplicate]
(1 answer)
Use dynamic variable names in JavaScript
(19 answers)
Closed 9 years ago.
How can I make the code that follows to work?
var x = 'name';
and then, to use the value inside x, as it was a variable, and set it, so that if i want it to be NAME, i'll have the result:
var name = 'NAME';
Is it possible ?
Not directly, no. But, you can assign to window, which assigns it as a globally accessible variable :
var name = 'abc';
window[name] = 'something';
alert(abc);
However, a much better solution is to use your own object to handle this:
var name = 'abc';
var my_object = {};
my_object[name] = 'something';
alert(my_object[name]);
I haven't seen the rest of your code, but a better way might be to use an object.
var data = {foo: "bar"};
var x = "foo";
data[x]; //=> bar
var y = "hello";
data[y] = "panda";
data["hello"]; //=> panda
I think this is a little cleaner and self-contained than the window approach
This question already has answers here:
Javascript create variable from its name
(5 answers)
Closed 8 years ago.
I need to run this line of Javascript:
#model.save({ name: #some_element.val() })
But the key, which in this case is name, will change depending on the value of a variable. The variable is a string representation of the key. So in this case, the variable is "name". How can I use the variable to specify the correct key? If I use the variable name directly it is interpreted as the key itself.
var obj = {};
obj[varName] = #some_element.val();
#model.save(obj);