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javascript object variable becomes undefined inside anonymous function


javascript object variable becomes undefined inside anonymous function

By : Burhan Mullamitha
Date : November 21 2020, 04:03 PM
this one helps. The scope changes when you enter that anonymous closure and 'this' changes. You can hack around it by doing
code :
var self = this;
function Goal(name) {
    var self = this;

    /* ... */

    this.gDiv.addEventListener('click', function(){
        alert(self.tasks);              
    });
this.gDiv.addEventListener('click', $.proxy(function() {
    alert(this.tasks);
 }, this));
this.gDiv.addEventListener('click', () => {
    alert(this.tasks);
 });


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In AJAX/JavaScript, how is it possible to refer to an undefined variable (anonymous function)?

In AJAX/JavaScript, how is it possible to refer to an undefined variable (anonymous function)?


By : Mayur Sapat
Date : March 29 2020, 07:55 AM
hope this fix your issue I'm following the W3Schools tutorial on AJAX, and it provides an example of using a JavaScript callback function here (code pasted below): , cfunc is assigned a value on this line:
code :
function loadXMLDoc(url,cfunc)
loadXMLDoc("ajax_info.txt",function() /* and the next several lines */
javascript object undefined under anonymous function

javascript object undefined under anonymous function


By : Moon Cricket
Date : March 29 2020, 07:55 AM
To fix the issue you can do Your code is incorrectly assuming that this will refer to a "ConstructNodes" object inside the event handlers. It won't; it'll be the element. Instead, store this in an object, and things will be better:
code :
ConstructNodes.prototype.getId = function(){
    var nodes = document.getElementsByClassName(this.className), obj = this;
    for (var i=0;i<nodes.length;i++){
        nodes[i].onclick = function(){
            var r = confirm(obj.alertMsg);
            if (r==true){
                alert(obj.hiddenId); // undefined
                document.getElementById(obj.hiddenId).value = this.id;
                alert(obj.hiddenId);
            } else {
                return;
            }
        };
    }
};
Javascript Global variable only update inside anonymous function

Javascript Global variable only update inside anonymous function


By : Ritik Shahu
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You're pushing to markers in a function that's called using setTimeout, so the push won't happen until some time later. But you're calling alert(markers) immediately, before any of the timeouts have occurred. So the array is empty at that time.
UPDATE:
code :
setTimeout(function() { alert(markers); }, netotal*50);
JavaScript undefined variable in an anonymous function

JavaScript undefined variable in an anonymous function


By : harshini kotha
Date : March 29 2020, 07:55 AM
it helps some times Closure issue.
Try adding a 3rd parameter to the setTimeout (doesn't work):
code :
setTimeout(function(i){
   children[i].style.display = "block";
   console.log(i);
}, 2000, i);
    var i = 0;
    var timer = setInterval(function () {
        children[i].style.display = "block";
        i++;
        if (i == children.length) {
            clearInterval(timer);
        }
    }, 2000);
for (let i = 0; children.length > i; i++ ) {
   setTimeout(function(){
      children[i].style.display = "block";
      console.log(i);
   }, 2000);
}
Javascript assign value of variable inside anonymous function

Javascript assign value of variable inside anonymous function


By : Raghavender Bandi
Date : March 29 2020, 07:55 AM
Hope this helps I ended up assigning the value of item.ServiceName to sourceVector. Then reading the value of sourceVector inside the loader function.
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