Retrieving attributes by their names using dots in HTML

Question

Retrieving attributes by their names using dots in HTML

Currently working on an Angular 2 website, I am faced with the challenge of displaying data from an object retrieved from the backend. The structure of the object is as follows:

{ version: 3.0.0, gauges:{ jvm.memory.total.used:{ value: 3546546 }}}

The issue arises when attempting to display attributes with dots in their names in the HTML using (assuming 'metrics' represents the object):

{{metrics.gauges.jvm.memory.total.used}}

Another approach I tried is:

metrics.gauges['jvm.memory.total.used'].value

While this method works in the controller, it fails in the HTML. It's worth noting that 'jvm.memory.total.used' is not the only attribute with dots in its name. Any insights on why this could be happening? Any suggestions for resolving this issue?

Appreciate your help.

javascript typescript angular

Answer 1

Answer №1

To avoid Angular throwing errors before data is retrieved from the server, consider utilizing the safe-navigation (Elvis) operator when rendering bindings.

{{metrics?.gauges.jvm.memory.total.used}}

Alternatively, you can use:

{{metrics?.gauges['jvm.memory.total.used]'}}

Answer 2

To avoid Angular throwing errors before data is retrieved from the server, consider utilizing the safe-navigation (Elvis) operator when rendering bindings.

{{metrics?.gauges.jvm.memory.total.used}}

Alternatively, you can use:

{{metrics?.gauges['jvm.memory.total.used]'}}

Answer 3

Answer №2

If the property name is invalid, you can only access it using bracket notation.

In your current query, jvm.memory.total.used is not a valid property name, so the only way to access it is as -

gauges['jvm.memory.total.used']

You must provide valid property names in order to resolve this issue.

I came across an informative article that you may find useful for reference.

Reason

When you use jvm.memory.total.used in your template, it actually treats it as:

jvm = {
  memory: { 
   total: {
     used: 'anyvalue'
   }
  }
}

However, since this structure does not exist, it will not display properly.

Answer 4

If the property name is invalid, you can only access it using bracket notation.

In your current query, jvm.memory.total.used is not a valid property name, so the only way to access it is as -

gauges['jvm.memory.total.used']

You must provide valid property names in order to resolve this issue.

I came across an informative article that you may find useful for reference.

Reason

When you use jvm.memory.total.used in your template, it actually treats it as:

jvm = {
  memory: { 
   total: {
     used: 'anyvalue'
   }
  }
}

However, since this structure does not exist, it will not display properly.

Answer 5

Answer №3

To overcome this limitation, a workaround is to create a getter for the property within your component's class.

@Component({
   selector: 'your-custom-component',
   template: `<p>{{ totalJvmMemoryUsed }}</p>`
})
export class CustomComponent {
   private data = { version: 4.0.0, gauges:{ 'memory.total.used':{ value: 9876543 }}};

   get totalJvmMemoryUsed() {
      // Ensure null safety when retrieving value from server
      return this.data.gauges['memory.total.used'];
   }
}

Answer 6

To overcome this limitation, a workaround is to create a getter for the property within your component's class.

@Component({
   selector: 'your-custom-component',
   template: `<p>{{ totalJvmMemoryUsed }}</p>`
})
export class CustomComponent {
   private data = { version: 4.0.0, gauges:{ 'memory.total.used':{ value: 9876543 }}};

   get totalJvmMemoryUsed() {
      // Ensure null safety when retrieving value from server
      return this.data.gauges['memory.total.used'];
   }
}

Retrieving attributes by their names using dots in HTML

Answer №1

Answer №2

Answer №3

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