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How to avoid multiple try catch for undefined values (by using if/else or some other way) while fetching border values f


By : Maurizio Folcini
Date : October 16 2020, 08:10 AM
should help you out You could write something like get in lodash and provide the path to the property you want to access as an array of strings and/or numbers:
code :
function get (object, path, defaultValue) {
  return object === undefined //object at current path is undefined
    ? defaultValue //return default value
    : path.length === 0 //no more items in path
      ? object //return value at completed path (path.length === 0)
      : object[path[0]] === undefined //go one level deeper
        ? defaultValue //there is nothing one level deeper, return default
        : get(object[path[0]], path.slice(1), defaultValue); //recursively call itself
}
const test = [{ name: 'hi' }];
console.log(get(test, [0, 'name']));
console.log(get(test, [1, 'name'], 'default value'));
console.log(
  get(undefined, [1, 'name'], 'other default value'),
);
//index of array does not have to be a number:
console.log(get(test, ['0', 'name']));


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How to avoid duplication of values while adding multiple values to a textbox dynamically in javascript?


By : arkangates
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Hiya sup man hope this helps as I just resolved for some demo http://jsfiddle.net/Yvnfx/ or without alert http://jsfiddle.net/Yvnfx/1/
For case - if you deleted the selected autocomplete http://jsfiddle.net/wbQZU/4/
code :
**var usedItems = []**
:
:// then
source: function(request, response) {

      //build new array with = AvailableTagsArray - UsedItemArray
             var newNonDuplicatetag = $.grep(availableTags, function(el){return $.inArray(el, usedItems) == -1});

            // delegate back to autocomplete, but extract the last term
            response($.ui.autocomplete.filter(
            newNonDuplicatetag, extractLast(request.term)));
        },
$(function() {
    var usedItems = [];

    var availableTags = [
        "ActionScript",
        "AppleScript",
        "Asp",
        "BASIC",
        "C",
        "C++",
        "Clojure",
        "COBOL",
        "ColdFusion",
        "Erlang",
        "Fortran",
        "Groovy",
        "Haskell",
        "Java",
        "JavaScript",
        "Lisp",
        "Perl",
        "PHP",
        "Python",
        "Ruby",
        "Scala",
        "Scheme"
        ];

    function split(val) {
        return val.split(/,\s*/);
    }

    function extractLast(term) {
        return split(term).pop();
    }


    $("#tags")
    // don't navigate away from the field on tab when selecting an item
    .bind("keydown", function(event) {
        if (event.keyCode === $.ui.keyCode.TAB && $(this).data("autocomplete").menu.active) {
            event.preventDefault();
        }
    }).autocomplete({
        minLength: 0,
        source: function(request, response) {
             var newNonDuplicatetag = $.grep(availableTags, function(el){return $.inArray(el, usedItems) == -1}); 
            // delegate back to autocomplete, but extract the last term
            response($.ui.autocomplete.filter(
            newNonDuplicatetag, extractLast(request.term)));
        },
        focus: function() {
            // prevent value inserted on focus
            return false;
        },
        select: function(event, ui) {
            var terms = split(this.value);
            // remove the current input
            terms.pop();
            // add the selected item
            usedItems.push(ui.item.value);
            alert(usedItems[1]);
            terms.push(ui.item.value);
            // add placeholder to get the comma-and-space at the end
            terms.push("");
            this.value = terms.join(", ");
            return false;
        }
    });
});


​

How to avoid duplication of values while adding multiple values to a textbox dynamically in JS?


By : Balann
Date : March 29 2020, 07:55 AM
To fix the issue you can do I'd use an object as a flags holder for whether you've seen a value before, since looking up properties in objects is something JavaScript engines optimize for. In contrast, if you hold this information in an array, calls to Array#indexOf that don't find anything get slower and slower as you add more entries to it.
code :
function clicker() {
    var itemsobj = document.getElementsByName("interestedin[]");
        seen = {},
        value,
        i,
        arr = [];

    for (i = 0; i < itemsobj.length; i++)
    {
        value = itemsobj[i].value;
        if (!seen[value])   // Works because if we haven't, `seen[value]` is `undefined` which is falsy
        {
            seen[value] = true;
            arr.push(value);
        }
    }

    document.getElementById('interest').value = arr.join(",");
    setProductPrice(arr, arr.length);
}

MySQL: Fetching Porportionate values for multiple values in select query


By : shyanu sunil
Date : March 29 2020, 07:55 AM
help you fix your problem This is the table i got with table name photos: , Consider the following...
code :
DROP TABLE IF EXISTS photos;

CREATE TABLE photos
(photo_id   INT NOT NULL PRIMARY KEY
,user_id INT NOT NULL
);

INSERT INTO photos VALUES
(401           ,1),     
(403           ,1),     
(405           ,1),     
(407           ,2),     
(408           ,1),     
(409           ,2),     
(410           ,1),     
(411           ,3),     
(412           ,2),     
(413           ,2),     
(420           ,2),     
(423           ,2);

SELECT x.*
     , COUNT(*) rank 
  FROM photos x 
  JOIN photos y 
    ON y.user_id = x.user_id 
   AND y.photo_id <= x.photo_id 
 GROUP 
    BY x.photo_id
     , x.user_id 
 ORDER 
    BY user_id
     , rank;
+----------+---------+------+
| photo_id | user_id | rank |
+----------+---------+------+
|      401 |       1 |    1 |
|      403 |       1 |    2 |
|      405 |       1 |    3 |
|      408 |       1 |    4 |
|      410 |       1 |    5 |
|      407 |       2 |    1 |
|      409 |       2 |    2 |
|      412 |       2 |    3 |
|      413 |       2 |    4 |
|      420 |       2 |    5 |
|      423 |       2 |    6 |
|      411 |       3 |    1 |
+----------+---------+------+

How to catch null, undefined, blank values with AngularJS filter


By : user3605673
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Whenever you encounter a function that's getting too complex to refactor try extracting some of the smaller statements to concisely named variables. It makes it much easier for our brains to keep track of the function's requirements, and it's also more readable to new devs reading your code.
code :
var inputHasValue = angular.isNumber(input) || input;
if(!inputHasValue){
    return '-';
}
if (!cellFilter) {
    return input;
}

var isPercentageCell = cellFilter.match(/pctg|percent|pctgFilter|incidence/ig);
var valueIsInRange = input > 0 && input < 1;
if(!isPercentageCell || valueIsInRange){
    return $filter(cellFilter)(input, args1, args2);
}
return '-';

fetching all values from Hashes with Multiple Values Per Key in perl


By : Waqas Javed
Date : March 29 2020, 07:55 AM
help you fix your problem You have three problems.
You are using hashrefs, not arrayrefs You aren't assigning anything to @val (at least, you weren't before you edited the question) You aren't doing anything to dereference your references
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