Locate identical values in Vuejs

Question

Locate identical values in Vuejs

When working with an array of objects, I need to check if a newly inserted object is a duplicate or not.


        this.duplicate = false;

        for(let item of this.items){
            if(item.id && this.item.name === item.name) {
                this.$notify({
                    group: "notify",
                    text: "Duplicate value!",
                    type: "error"
                });
                this.duplicate = true;
            }
        }

        if(!this.duplicate){
            // Handle post/put request
        }

This code currently only works for adding new items (post request). When updating existing items, it always flags them as duplicates.

javascript vue.js vuejs2

Answer 1

Answer №1

Prior to adding an item, it is recommended to validate if it already exists

  const newItem; // obtained from request

  const duplicateIndex = this.items
    .map(item => item.name)
    .indexOf(newItem.name);
  // Retrieves the index of an object with the same name as the new item's name 
  // or returns -1 if not found

  // Processing a Post request
  if (newItem.id == null) {
    if (duplicateIndex) {
      this.$notify({
        group: "notify",
        text: "Value already exists!",
        type: "error"
      });
    } else {
      this.items.push(newItem);
    }
  // Handling a Put request
  } else {
    this.items[duplicateIndex] = newItem;
  }

Answer 2

Prior to adding an item, it is recommended to validate if it already exists

  const newItem; // obtained from request

  const duplicateIndex = this.items
    .map(item => item.name)
    .indexOf(newItem.name);
  // Retrieves the index of an object with the same name as the new item's name 
  // or returns -1 if not found

  // Processing a Post request
  if (newItem.id == null) {
    if (duplicateIndex) {
      this.$notify({
        group: "notify",
        text: "Value already exists!",
        type: "error"
      });
    } else {
      this.items.push(newItem);
    }
  // Handling a Put request
  } else {
    this.items[duplicateIndex] = newItem;
  }

Answer 3

Answer №2

One way to identify duplicate values is by comparing the existing ID of a record with that of other records. If the IDs don't match, and other properties also differ, it can be considered a proper duplicate.

this.duplicate = false;

for(let item of this.items){ 

var existingId=this.item.id || -1; // Using null coalescing operator (??) to assign a default value:


        
        if (existingId!=item.id && this.item.name.toUpperCase().indexOf(item.name.toUpperCase()) == -1) {
           this.$notify({
                group: "notify",
                text: "Duplicate value! ",
                type: "error"
            });
            this.duplicate = true ;
        } else {
             //nothing found
        }        
    }

    if(!this.duplicate){
        // Perform post/put request
    }

Answer 4

One way to identify duplicate values is by comparing the existing ID of a record with that of other records. If the IDs don't match, and other properties also differ, it can be considered a proper duplicate.

this.duplicate = false;

for(let item of this.items){ 

var existingId=this.item.id || -1; // Using null coalescing operator (??) to assign a default value:


        
        if (existingId!=item.id && this.item.name.toUpperCase().indexOf(item.name.toUpperCase()) == -1) {
           this.$notify({
                group: "notify",
                text: "Duplicate value! ",
                type: "error"
            });
            this.duplicate = true ;
        } else {
             //nothing found
        }        
    }

    if(!this.duplicate){
        // Perform post/put request
    }

Locate identical values in Vuejs

Answer №1

Answer №2

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