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undefined value in javascript


undefined value in javascript

By : user2953606
Date : November 21 2020, 01:01 AM
I hope this helps . Instead of setting a "value" property on an "a" tag which is not a valid attribute you want to set a "data-value" attribute instead, like so:
code :
out += '<li><a href="" onclick="myfunction(this)" id="'+arr[i].code+'" data-value="'+arr[i].name+'">' + 
var c=document.getElementById(x).getAttribute('data-value')


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array.length returns undefined if the last element is undefined in javascript

array.length returns undefined if the last element is undefined in javascript


By : russellxmartlabs
Date : March 29 2020, 07:55 AM
Does that help Because the last element in the array is undefined.
The array has 3 elements 1, 2 and undefined where undefined has the index 2 and the array has a length of 3.
Is there a way to prevent undefined javascript variables from displaying 'undefined' when inserted into html?

Is there a way to prevent undefined javascript variables from displaying 'undefined' when inserted into html?


By : subhash
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Can you use the logical operator || ?
code :
array.object.textField1||''
In Javascript, why does a child key of an undefined object return with error instead of just undefined?

In Javascript, why does a child key of an undefined object return with error instead of just undefined?


By : Goran Ivanov
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further The programming language Groovy has what you want, and it calls it the "Safe Navigation" operator. The syntax is to use ?. instead of . when you want this behavior. So you would say
code :
if (myObject?.property1?.description) {
    // ...
}
if (isSet(myObject, 'property1.description')) {
    // ...
}
Javascript: What equals undefined? Why doesn't myVar == undefined work?

Javascript: What equals undefined? Why doesn't myVar == undefined work?


By : englisholom
Date : March 29 2020, 07:55 AM
With these it helps You should use !== undefined. ! myVariable == undefined is parsed as (!myVariable) == undefined due to operator precedence, which is always false as ! always returns a boolean value.
Javascript const coming up as undefined and not undefined in chrome dev console

Javascript const coming up as undefined and not undefined in chrome dev console


By : user6338262
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I think it's a side effect of what transpilation does with const, as after transpilation the JS runtime actually has to track 2 different variables.
React Native uses Babel to transpile (source, pointing at line in 0.45.1 where it enables block scoping).
code :
const i = Date.now() % 2;
switch(i) {
    case 0: {
        const x = "zero";
        console.log("x", x);
    }
    case 1: {
        const x = "one";
        console.log("x", x);
    }
    default: {
        const x = "wat";
        console.log("x", x);
    }
}
"use strict";

var i = Date.now() % 2;
switch (i) {
    case 0:
        {
            var x = "zero";
            console.log("x", x);
        }
    case 1:
        {
            var _x = "one";
            console.log("x", _x);
        }
    default:
        {
            var _x2 = "wat";
            console.log("x", _x2);
        }
}
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