Question

185

Uncaught TypeError: Cannot read property 'indexOf' of undefined in javascript

rated 0 times [ 186] [ 1] / answers: 1 / hits: 30226 / 7 Years ago, fri, june 9, 2017, 12:00:00

var id    = $('.getval_'+product_id+''+index+'').attr(id);

var value = ;



console.log(id);

//data that return by id

6059

s2id_6061

6122

s2id_8410



if (id.indexOf('s2id_') > 0) {

    value = $('.getval_'+product_id+''+index+'').select2('val');

}else{      

    value = $('.getval_'+product_id+''+index+'').val();

}

Question:
The code above is show that when the ID return by jquery, then it will show a list of data, so what I want is when the ID return, if the in front of ID don't have s2id_ it will go else statement. But the code return an error which is (Uncaught TypeError: Cannot read property 'indexOf' of undefined)

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3 Years ago

answered 7 Years ago masonm · Accepted Answer

You need to check whether id itself is set, and there are two ways of going about this.

Either chain the if (id.indexOf('s2id_') > 0) condition inside an outer if condition that checks for id:

if (id) {

    if (id.indexOf('s2id_') > 0) {

        value = $('.getval_'+product_id+''+index+'').select2('val');

    }else{      

        value = $('.getval_'+product_id+''+index+'').val();

    }

}

Or check for both conditions with an and statement:

if (id && id.indexOf('s2id_') > 0) {

    value = $('.getval_'+product_id+''+index+'').select2('val');

}else{      

    value = $('.getval_'+product_id+''+index+'').val();

}

Hope this helps! :)