Using JavaScript build-in functions in a Vue template allows for enhanced functionality and

Question

Using JavaScript build-in functions in a Vue template allows for enhanced functionality and

Is there a way to utilize JavaScript built-in functions within a Vue template?

{{ eval(item.value.substring(2)) }}

I attempted to use the JS function eval() in {{}}, but encountered several errors such as:

[Vue warn]: Property or method "eval" is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property. See: https://v2.vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.

[Vue warn]: Error in render: "TypeError: _vm.eval is not a function"

vue.esm.js?efeb:1906 TypeError: _vm.eval is not a function

javascript vue.js templates

Answer 1

Answer №1

Attempting to run the eval function within a template can trigger the vue framework to run the eval method of your current component. To incorporate the output of the global eval function into your template, you should create a variable in the data object of your component and store the result there. Another approach is to create a computed property with an eval invocation and then use this property within the template.

Answer 2

Attempting to run the eval function within a template can trigger the vue framework to run the eval method of your current component. To incorporate the output of the global eval function into your template, you should create a variable in the data object of your component and store the result there. Another approach is to create a computed property with an eval invocation and then use this property within the template.

Answer 3

Answer №2

First and foremost, using the eval function is considered a poor practice in almost all situations (99.9% of the time).

If you are intent on using it, you may need to tap into the window object, as discussed in this post How to access the window object in vue js?

You could try implementing something along these lines:

methods: {
 eval(expr){ return window.eval(expr) }
}

By following these steps, the eval method should now be accessible within the template.

Answer 4

First and foremost, using the eval function is considered a poor practice in almost all situations (99.9% of the time).

If you are intent on using it, you may need to tap into the window object, as discussed in this post How to access the window object in vue js?

You could try implementing something along these lines:

methods: {
 eval(expr){ return window.eval(expr) }
}

By following these steps, the eval method should now be accessible within the template.

Answer 5

Answer №3

Give this a shot.

<template>
...
{{ item }}
...
</template>

<script>
//...
data(){
  return {
    item: "oldVal"
  }
},
methods: {
   myFunc(){
     this.item = eval(item.value.substring(2)) //<-- at this point
   }  
}
//...
</script>

Answer 6

Give this a shot.

<template>
...
{{ item }}
...
</template>

<script>
//...
data(){
  return {
    item: "oldVal"
  }
},
methods: {
   myFunc(){
     this.item = eval(item.value.substring(2)) //<-- at this point
   }  
}
//...
</script>

Answer 7

Answer №4

When working inside the Vue template, all references need to be prefaced with 'this.', making it impossible to directly access certain global objects.

To work around this limitation, a simple solution is to move the code to the methods section of your Vue component.

Alternatively, you could follow a clever workaround inspired by @Mikhail Semikolenov's suggestion: create a computed property for the window object and use it to call functions like eval in this manner:

{window.eval(...)}

Answer 8

When working inside the Vue template, all references need to be prefaced with 'this.', making it impossible to directly access certain global objects.

To work around this limitation, a simple solution is to move the code to the methods section of your Vue component.

Alternatively, you could follow a clever workaround inspired by @Mikhail Semikolenov's suggestion: create a computed property for the window object and use it to call functions like eval in this manner:

{window.eval(...)}

Answer 9

Answer №5

There is no need to rely on the use of eval(). Instead, you can achieve the desired functionality by calling a method within your template like this:

<template>
    ...
    {{customMethod(item.value)}}
</template>

The custom method should be defined as follows:

methods: {
   customMethod(value){
        return value.slice(2)
    } 
}

If for some reason you still want to proceed with using eval, make sure to pass the computed result as a return in the method functions.

Answer 10

There is no need to rely on the use of eval(). Instead, you can achieve the desired functionality by calling a method within your template like this:

<template>
    ...
    {{customMethod(item.value)}}
</template>

The custom method should be defined as follows:

methods: {
   customMethod(value){
        return value.slice(2)
    } 
}

If for some reason you still want to proceed with using eval, make sure to pass the computed result as a return in the method functions.

Using JavaScript build-in functions in a Vue template allows for enhanced functionality and

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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