How to do Validation using "name = xxx"

user_13796961 0
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How to do Validation using "name"

Here is Loan auto calc script.

https://jsfiddle.net/diessses/Lpaqnoue/

I have a question about Validation. I could error check using "id = xxx". but I changed code as "name = xxx". Could you teach me how to write code using "name = xxx" please?

function showError(error) {
  document.getElementById('results').style.display = 'none';
  document.getElementById('loading').style.display = 'none';
  const errorDiv = document.createElement('div');
  const card = document.querySelector('.card');
  const heading = document.querySelector('.heading');
  errorDiv.className = 'alert alert-danger';
  card.insertBefore(errorDiv, heading);
  setTimeout(clearError, 300);
}

And also I would like to do validation at "cb_amount" Input field.

'cb_amount' value must like this

'cb_amount' =< ('amount' - 'downpayment') / 2

I would like to add this at showError function.

calculator javascript
1 Answers

Use getElementsByName to get the element.

let downpayment = documnet.getElementsByName("downpayment")[0].value
let amount = document.getElementsByName("amount")[0].value
let cb_amount = document.getElementsByName("cb_amount")[0].value

now you can write your condition. Here the value returned by documnet.getElementsByName("downpayment") is array like element so we need to use [0] to fetch the required element.

user_135722310
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