how to replace undefined with a empty string

Question

I am using jsPdf. When a field has been left blank "undefined" is printed on the pdf. I would like to replace that with a empty string. I am trying to use a if statement but I am not getting it.

 doc.text(30, 190, "Budget : $");
    if ($scope.currentItem.JobOriginalBudget == "undefined") {

        doc.text(50, 190, " ");
    }
    else {
        var y = '' + $scope.currentItem.JobOriginalBudget;
        doc.text(50, 190, y);
    };

Just do `var value = $scope.currentItem.JobOriginalBudget || " "; doc.text(50, 190, value+'') ` Check for falsy value which could be `undefined, "", null, NaN, false, 0` etc.. Or use `angular.isUndefined($scope.currentItem.JobOriginalBudget)` for specific check, or even `angular.isDefined` for the opposite of previous — PSL, Sep 16 '14 at 18:52
or expanding on what @PSL shows, create a simple helper function since a PDF likely has numerous of these to do and can write `getVal(var)` a lot easier than lots of comparisons — charlietfl, Sep 16 '14 at 18:57
`var y = '' + ($scope.currentItem.JobOriginalBudget || '');` — Jason Goemaat, Sep 16 '14 at 20:24

score 21 · Answer 1 · edited May 23 '17 at 11:54

21

As per this answer I believe what you want is

doc.text(50, 190, $scope.currentItem.JobOriginalBudget || " ")

edited May 23 '17 at 11:54

Community

1
1

answered Jan 09 '17 at 12:40

Nuno Costa

1,210
11
12

score 15 · Accepted Answer · answered Sep 16 '14 at 18:50

undefined is a primitive value. Instead of comparing against the identifier undefined, you're comparing against the 9-character string "undefined".

Simply remove the quotes:

if ($scope.currentItem.JobOriginalBudget == undefined)

Or compare against the typeof result, which is a string:

if (typeof $scope.currentItem.JobOriginalBudget == "undefined")

score 3 · Answer 3 · answered May 16 '19 at 10:07

var ab = {
firstName : undefined,
lastName : undefined
}

let newJSON = JSON.stringify(ab, function (key, value) {return (value === undefined) ? "" : value});

console.log(JSON.parse(newJSON))

<p>
   <b>Before:</b>
   let ab = {
   firstName : undefined,
   lastName : "undefined"
   }
   <br/><br/>
   <b>After:</b>
   View Console
</p>

theDarse · Answer 4 · 2014-09-17T13:17:54.560

2

simply remove the "== 'undefined'"

if (!$scope.currentItem.JobOriginalBudget) {
    doc.text(50, 190, " ");
}

edited Sep 17 '14 at 13:17

answered Sep 16 '14 at 18:51

theDarse

749
5
13

score 1 · Answer 5 · answered Feb 16 '19 at 22:13

1

If item is an Object use, this function :

replaceUndefinied(item) {
   var str =  JSON.stringify(item, function (key, value) {return (value === undefined) ? "" : value});
   return JSON.parse(str);
}

answered Feb 16 '19 at 22:13

Maxime

643
10
21

Ruslan Novikov · Answer 6 · 2022-04-15T10:27:11.713

0

In my case

doc.text(50, 190, $scope.currentItem.JobOriginalBudget??"")

edited Apr 15 '22 at 10:27

answered Mar 12 '22 at 18:22

Ruslan Novikov

1,320
15
21

how to replace undefined with a empty string

6 Answers6

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