book-code.js

window.addEventListener('load' , () => {
    const params = (new URL(document.location)).searchParams;
    const nprop = params.get('name');
    if (nprop != ''){
      document.getElementById('prop').value = nprop;
    }
  })



function frmsbm(){
  num_val = document.getElementById('num').value
  if (document.getElementById('email').value.includes('@')){
    if (document.getElementById('email').value.includes('.')){
      if (num_val.length == 10){
        if(num_val.slice(0, 1) >= 7 && num_val.slice(0, 1) <=9 ){
          if(isNaN(num_val)){
            alert('Mobile Number is incorrect');
          }
          else{
            document.getElementById('subm').style['display'] = 'block';
            document.getElementById('frm').style['display'] = 'none';
          }
        }
        else{
          alert('Mobile Number is incorrect');
        }
      }
      else{
        alert('Mobile Number is incorrect');
      }
    }
    else{
      alert('Email Address is incorrect');
    }
      }
      else{
        alert('Email Address is incorrect');
      }
  }