[Vuejs]-Vue.js: Cannot read property 'includes' of undefined

by

1👍

✅

There is not property like include in array/list it should be includes. Small typo.

addTocart(item) {
  if (this.form.items.includes(item)) { // <-- change include to includes 
    alert("already there");
  } else {
    this.form.items.push(item);
  }
  Vue.set(item, 'quantity', 1);
  Vue.set(item, 'discount', 1);
},

Update

If res.returnpurchase is undefined then it is setting whole form variable as undefined or if items in undefined then it is setting items as undefined which should be [] for using includes. Add check for this, 

if (res.returnpurchase == undefined 
   || res.returnpurchase.items == undefined) {
   this.form.items = []
}
👤Ratnadeep Bhattacharyya

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