How to use indexOf() function in javascript

Question

HI All, I got a code and its not really working well in how I use indexOf(). Please enlighten me. Here's my code: ({
 extendsFrom:'RecordView',

initialize:function(options){
 this._super('initialize',[options]);
 this.context.on('button:save_button:click',this.concatField, this);
 },
 concatField: function(field) { 
 var field_two_c = this.model.get('field_two_c'),
 space = " ",
 field_one_c = this.model.get('field_one_c');
 if (_.indexOf(field_one_c,field_two_c) == -1){
 this.model.set('field_one_c', field_one_c+space+field_two_c); 
 }
 else{
 this.model.set('field_one_c', field_one_c);
 }
 },
})
 Everytime i click Save, the fields concats. I dont want to concat it when field_one_c contain some string from field_two_c. Thanks, Longki

Roland Cadavos · Accepted Answer

Hi Longki, The Underscore indexOf function is for finding values inside an array. You will either need to change the first parameter to be an array: var field_one_arr = [field_one_c];
if(_.indexOf(field_one_arr, field_two_c) !== -1) {
 Or you can do indexOf directly on the string variable: if(field_one_c.indexOf(field_two_c) !== -1) {
 Let me know if that helps! -Alan