$scope.isChecked = function(id){
var i=0,j=0,k=0;
//$scope.abc[i].usertype[j].keywords[0].key_bool=true;
if($scope.abc[i].type_selected == true){
while($scope.abc[i].usertype.length){
while($scope.abc[i].usertype[j].keywords.length){
if($scope.abc[i].usertype[j].keywords[k]._id == id){
if($scope.abc[i].usertype[j].keywords[k].key_bool == true){
$scope.abc[i].usertype[j].keywords[k].key_bool = false;
return false;
}
else{
$scope.abc[i].usertype[j].keywords[k].key_bool = true;
return true;
}
}
k++;
}
j++;
}
}
};
Incrementing k++ is working while incrementing j++ not, can someone explain me this, why such happening?
isChecked function called whenever checkbox is checked/unchecked as:
ng-click="isChecked(l._id)"
Everything works perfectly for 'j=0', but not for later 'j' values.
Simply because of the return statements execution gets out of the function every time a return statement is reached. So j++; is unreachable every time the if statement is executed
for j=0, it goes inside the inner while loop, and when it reaches to the return statement, it comes out of function.
That is why, outer while loop is not getting executed again.
To get more about return, read this
i got the answer.
we have to put k=0; between the 2 while loops.
still thanks guys for ur help
Related
When submit the form it runs both means to say code inside if is running and after else code is also running.
$("#new_chq").submit(function(){
var inputs = document.getElementsByName("val_2[]");
var i;
for (i = 1; i <= inputs.length; i++) {
$('#file_'+i).each(function() {
if(!$('#file_'+i).val() == ''){
$('#text_'+i).attr('required', '');
return false;
}
else{
return true ;
}
});
}
});
As you can see in docs:
We can break the $.each() loop at a particular iteration by making the
callback function return false. Returning non-false is the same as a
continue statement in a for loop; it will skip immediately to the next
iteration.
So, you need to move the form event handling after the jQuery each-loop.
Here is an example:
$("#new_chq").on('submit', function() {
var isValid = true;
$('[id^=file_]').each(function() {
if($(this).hasAttr('required') && !$(this).val()) {
isValid = false;
return false; // <- this breaks the loop
};
});
return isValid;
});
Please note, there are other errors in your code, such as $('#file_'+i).each loop, which has no sense - that is one element with unique id.
I'm new at javascript and am using tampermonkey for a website.
What i want to do is monitor a variable on a page and when said variable reaches a certain value, go to another page, do something, and then recheck the value of this variable.
My logic was to:
setInterval(function(){reloadPage1},10000);
var variable = someTextonThisPage;
if(someTextonthisPage meets condition)
{
go to Page2;
execute something on page 2;
setNewValueForVariable; //(or just go back to initial
//and get the new value from there)
}
Now my problem is when the if executes, it goes to page2 keeps looping the if call even if i set the variable to something false.
I tried doing something like:
function doThis()
{
if(condition)
return true;
else return false;
}
if(doThis())
{
goToPage2;
do stuff;
doThis();
}
I end up having the if statement go on and on, going to page 2 and my settimeouts to do something on that page never execute because of the next iteration of the 'if'.
What am i doing horribly wrong in my thought pattern?
Your doThis() function is right. Everything ok with it.
function doThis()
{
if(condition)
return true;
else
return false;
}
But when you check the loop you have to call it one time only. After doing stuff you are again calling doThis() function it is wrong.
if(doThis())
{
goToPage2;
do stuff;
//doThis();
}
And also it depends on how you are calling this loop and functions.
For eg.,
<script>
var i = 0;
onPageLoad()
{
if(i%2==0){
return true;
i++;
}else{
return false;
i++;
}
}
if(onPageLoad()){
goToPage2;
doStuff();
}else{
onPageLoad()
}
</script>
Here when the condition meets the right statement which is i%2 == 0 it will automatically call goToPage2 function otherwise it again going to check the condition.
You can add interval/timeout in the loop to check when the variable is updating and when it calls goToPage2 function.
Hope this helps.
How do I break out of a jQuery each loop?
I have tried:
return false;
in the loop but this did not work. Any ideas?
Update 9/5/2020
I put the return false; in the wrong place. When I put it inside the loop everything worked.
To break a $.each or $(selector).each loop, you have to return false in the loop callback.
Returning true skips to the next iteration, equivalent to a continue in a normal loop.
$.each(array, function(key, value) {
if(value === "foo") {
return false; // breaks
}
});
// or
$(selector).each(function() {
if (condition) {
return false;
}
});
According to the documentation return false; should do the job.
We can break the $.each() loop [..] by making the callback function
return false.
Return false in the callback:
function callback(indexInArray, valueOfElement) {
var booleanKeepGoing;
this; // == valueOfElement (casted to Object)
return booleanKeepGoing; // optional, unless false
// and want to stop looping
}
BTW, continue works like this:
Returning non-false is the same as a continue statement in a for loop; it will skip immediately to the next iteration.
I came across the situation where I met a condition that broke the loop, however the code after the .each() function still executed. I then set a flag to "true" with an immediate check for the flag after the .each() function to ensure the code that followed was not executed.
$('.groupName').each(function() {
if($(this).text() == groupname){
alert('This group already exists');
breakOut = true;
return false;
}
});
if(breakOut) {
breakOut = false;
return false;
}
I created a Fiddle for the answer to this question because the accepted answer is incorrect plus this is the first StackOverflow thread returned from Google regarding this question.
To break out of a $.each you must use return false;
Here is a Fiddle proving it:
http://jsfiddle.net/9XqRy/
I know its quite an old question but I didn't see any answer, which clarify that why and when its possible to break with return.
I would like to explain it with 2 simple examples:
1. Example:
In this case, we have a simple iteration and we want to break with return true, if we can find the three.
function canFindThree() {
for(var i = 0; i < 5; i++) {
if(i === 3) {
return true;
}
}
}
if we call this function, it will simply return the true.
2. Example
In this case, we want to iterate with jquery's each function, which takes anonymous function as parameter.
function canFindThree() {
var result = false;
$.each([1, 2, 3, 4, 5], function(key, value) {
if(value === 3) {
result = true;
return false; //This will only exit the anonymous function and stop the iteration immediatelly.
}
});
return result; //This will exit the function with return true;
}
"each" uses callback function.
Callback function execute irrespective of the calling function,so it is not possible to return to calling function from callback function.
use for loop if you have to stop the loop execution based on some condition and remain in to the same function.
I use this way (for example):
$(document).on('click', '#save', function () {
var cont = true;
$('.field').each(function () {
if ($(this).val() === '') {
alert('Please fill out all fields');
cont = false;
return false;
}
});
if (cont === false) {
return false;
}
/* commands block */
});
if cont isn't false runs commands block
var understand = true;
while(/* ... */) {
console.log("I'm learning while loops!");
understand = false;
}
I want to print "I'm learning while loops!" so what condition need to write in loop?
Try this:
while(understand){
console.log("I'm learning while loops!");
understand = false;
}
Edit1:
If you want your loop to run for number of times:
var i=0;
while(i<10){ //suppose you want to run your loop for 10 times.
console.log("I'm learning while loops!");
i++;
}
Edit2: (Reply to code in comments)
You are using loop as a function name and checking same in the while loop which is wrong.
Try this:
var myFunctionName = function()
{
var myVariableName = 0;
while(myVariableName<3)
{
console.log("In loop" + myVariableName);
myVariableName++;
}
};
myFunctionName();
Try this to execute your while loop once.
var understand = false; // not yet
while(understand !== true){
console.log("I'm learning while loops!");
understand = true; // I do now!
}
var understand = true;
while( understand == true){
console.log("I'm learning while loops!");
understand = false;
}
The while loop will continue to execute while the condition evaluates to true. So it really depends on the condition you want. If you just want a single loop, and judging by your code, you probably want the following:
var understand = true;
while(understand) {
console.log("I'm learning while loops!");
understand = false;
}
This is like saying: "while understand equals true, then execute the loop"
It is worth mentioning that the variable name understand doesn't make much sense starting as true and being set to false when you want to break the loop (assuming that you want to break the loop when you do understand). So the following would be more logical:
var understand = false;//don't yet understand, so enter loop
while(!understand) {
console.log("I'm learning while loops!");
understand = true;//now I understand, so break loop
}
This is like saying: "while understand equals false, then execute the loop"
How to break from objx(data).each(function(item) iteration when a certain condition is met.
My Json string is below:
var data= [{"field1": "0","field2": "2"},{"field1": "7","field2": "2"},{"field1": "1","field2": "5"}];
Here is a my code:
function iterate(){
objx(data).each(function(item){
if(item.field1 == "7"){
//doing some job;
return;
}
alert("after if is executed");// this alert coming inspite of giving
}); // return in if block
}
i think the return is only enabling it to come out of function but not from the loop. i dont want this unnecessary iteration once my condition is met and job is done.
can anyone suggest how to come out of this each loop?
return false;
Returning false breaks out of the each function.
To exit the jquery each loop
function iterate(){
objx(data).each(function(item){
if(item.field1 == "7"){
//to stop the loop here
return false; // here - will exit the each loop
}
});
}