How to validate first number not zero in vue.js?

@jerad 

You can validate the first number not being zero in a Vue.js input field by using a custom validation rule. Here's an example of how you can achieve this:

1. Define a custom validation rule in your Vue.js component:

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data() {
  return {
    number: null,
    error: ''
  };
},
methods: {
  validateFirstNumber(value) {
    if (value.charAt(0) === '0') {
      this.error = 'First number cannot be zero';
    } else {
      this.error = '';
    }
  }
}

1. Use the custom validation rule on the input field in your template:

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<input v-model="number" @input="validateFirstNumber(number)" type="text">
<p v-if="error">{{ error }}</p>

In this example, the validateFirstNumber method is called whenever the user types in the input field. The method checks if the first character of the input value is '0' and sets an error message if it is.

This way, you can validate that the first number is not zero in a Vue.js application.