Jquery if keyup else default value

Question

I have a textbox whose value comes from database but if a user changes the value then this value needs to be used in a calculation.

$('#ecost input.ecost').keyup(function(){
    if (!isNaN(this.value) && this.value.length != 0) {
        var Cost = $(this).val();
    }
});

and

var cost = $('input.ecost1').val();

I need if keyup function for user enter value (first code example) else default database value (second code example). How can I write this if/else condition?

i need

 if ($('#ecost input.ecost').keyup(function(){
    if (!isNaN(this.value) && this.value.length != 0) {
        var Cost = $(this).val();
    }
}); ) 
else {
var cost = $('input.ecost1').val();
}

i know in if() code is wrong but above logic how to corrected

how to place if else condition to get one of value above i want if keyup than that value other wise dfault (below value) — Nachiket Chaudhary
– Nachiket Chaudhary, Commented Apr 15, 2015 at 8:14

Alexey · Accepted Answer · 2015-04-15 08:19:39Z

2

If I understand correctly, this is what is required.

var valueFromDB = getValueFromDB(); //Your function for calling database
var Cost = 0;
$('#ecost input.ecost').keyup(function(){
    if (!isNaN(this.value) && this.value.length != 0) {
        Cost = $(this).val();
    }
    else{
        Cost = valueFromDB;
    }
});

answered Apr 15, 2015 at 8:19

Alexey

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Comments

Johannes Reuter · Accepted Answer · 2015-04-15 07:49:56Z

0

if-else in javascript works like this:

if(expression) {
    //do this if expression is true
} else {
    //do this if expression is false
}

answered Apr 15, 2015 at 7:49

Johannes Reuter

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1 Comment

Nachiket Chaudhary Over a year ago

thanks but i need for keyup what is condition i have to write.

onerror · Accepted Answer · 2015-04-15 08:46:46Z

0

Is it that you want?

var Cost = $('input.ecost1').val();
$('#ecost input.ecost').keyup(function(){
    if (!isNaN(this.value) && this.value.length != 0) {
        Cost = $(this).val();
    }
 }

edited Apr 15, 2015 at 8:46

answered Apr 15, 2015 at 8:21

onerror

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2 Comments

Nachiket Chaudhary Over a year ago

according to your answer $('#ecost input.ecost').keyup(function(){ this keyup function must but i need if keyup else default value

onerror Over a year ago

then use the default value outside the handler, I edited the answer

Matt D. Webb · Accepted Answer · 2015-04-15 08:48:26Z

0

You do not need to include the else if you provide a default value before you evaluate your input:

UPDATE as per comments below.

var Cost = 123; // default value;

$('#ecost input.ecost').keyup(function(){

    if (!isNaN(this.value) && this.value.length != 0) {
        Cost = this.value;
    }
});

edited Apr 15, 2015 at 8:48

answered Apr 15, 2015 at 8:19

Matt D. Webb

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2 Comments

Nachiket Chaudhary Over a year ago

according to your answer $('#ecost input.ecost').keyup(function(){ this keyup function must but i need if keyup else default value

Matt D. Webb Over a year ago

@NachiketChaudhary I have updated my answer. By initialising a default value Cost on page load for instance, any time the keyup function is then executed, a new value will replace the default Cost.

jasie · Accepted Answer · 2022-06-11 00:07:23Z

0

Thank you for the answers, I have this problem also and I edit @onerror answer. It works well

var search = $("#teacher_year_filter").val();

$("#teacher_year_filter").on("keyup", function() {
    if (!isNaN(this.value) && this.value.length != 0) {
        search = this.value
    }

    var table_1 = table1.column(3).search(search).draw();
});

var table_2 = table1.column(3).search(search).draw();

It will filter the default value in the input, and once we type (keyup), then it will filter using the current input.

edited Jun 11, 2022 at 0:07

jasie

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answered Jun 9, 2022 at 17:13

imran_fauzi

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