Error Alert: The function split cannot be applied to params[item]

Question

Error Alert: The function split cannot be applied to params[item]

ERROR! The console is outputting a message stating that TypeError: params[item].split is not a function. I would greatly appreciate any assistance in resolving this issue. Understanding where I went wrong in tackling this problem would be the most beneficial help.

routeReady() {
    this.activeRoute.queryParams
        .pipe(switchMap(params => {
            if (!params['filter']) {
                // using previous month as default
                let date : Date = new Date();
                date.setDate(1);
                date.setMonth(date.getMonth() - 1);
                this.formData.startDate = DateUtils.dateToText(date);
                date.setDate(DateUtils.getDaysInMonth(date));
                this.formData.endDate = DateUtils.dateToText(date);
            }
            ['startDate', 'endDate', 'club'
                , 'subscription', 'sold'].forEach(item => {
                if (item in params && params[item] !== '') {
                    this.formData[item] = params[item];
                }
            });
            ['courts', 'groups', 'zones'].forEach(item => {
                if (item in params && params[item] !== '') {
                    this.formData[item] = params[item].split(',');
                }
            });
            return Promise.resolve(true);
        }))
        .subscribe();
}

This error has me stumped:

https://i.sstatic.net/poejp.png

javascript angular typescript

Answer 1

Answer №1

It's not a standard object, but rather some kind of special angular feature. To access its value, you need to use:

params.get('specific property');

In your scenario, the code would look like this:

params.get(item).split(',');

If I were in your shoes, here is how I would handle it:

['courts', 'groups', 'zones'].forEach(item => {
  const value = params.get(item);

  if (value) {
    this.formData[item] = value.split(',');
  }
});

Answer 2

It's not a standard object, but rather some kind of special angular feature. To access its value, you need to use:

params.get('specific property');

In your scenario, the code would look like this:

params.get(item).split(',');

If I were in your shoes, here is how I would handle it:

['courts', 'groups', 'zones'].forEach(item => {
  const value = params.get(item);

  if (value) {
    this.formData[item] = value.split(',');
  }
});

Answer 3

Answer №2

This particular code assumes that the variable params[item] is of type string:

this.formData[item] = params[item].split(',')

Remember, JavaScript strings offer a split method for manipulation:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split

If the data stored in params[item] is not text, then it will not have a split method and an error will occur:

params[item].split is not a function

To verify the data type, you can use:

console.log('params[item]', params[item], typeof params[item])

Answer 4

This particular code assumes that the variable params[item] is of type string:

this.formData[item] = params[item].split(',')

Remember, JavaScript strings offer a split method for manipulation:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split

If the data stored in params[item] is not text, then it will not have a split method and an error will occur:

params[item].split is not a function

To verify the data type, you can use:

console.log('params[item]', params[item], typeof params[item])

Error Alert: The function split cannot be applied to params[item]

Answer №1

Answer №2

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