Show error message from preConfirm in sweetalert2

Question

Im using sweetalert2 and sweetalert2-react-content. My inputValidator works fine, it present errors to the user. How can I do the same in the preConfirm where I have an AJAX request?

    MySwal.fire({
        title: 'title',
        input: 'text',
        html: this.renderInfoText(),
        showLoaderOnConfirm: true,
        inputValidator: (value) => {
            return new Promise((resolve) => {
              if (this.validate(value)) { 
                resolve()
              } else {
                resolve('check formatting...')
              }
            })
        },            
        preConfirm: (pno) => {
            return axios.post('/some/route', { pno })
                .then(response => { 
                    // ...
                })
                .catch(error => {
                    // show an error message to the user from here?
                });
        }
    }) 

Answer 1

This is actually documented in the examples under the AJAX request example. Here is my solution:

MySwal.fire({
    title: 'title',
    input: 'text',
    html: this.renderInfoText(),
    showLoaderOnConfirm: true,
    inputValidator: (value) => {
        return new Promise((resolve) => {
          if (this.validate(value)) { 
            resolve()
          } else {
            resolve('check formatting...')
          }
        })
    },            
    preConfirm: (pno) => {
        return axios.post('/some/route', { pno })
            .then(response => { 
                // ...
            })
            .catch(error => {
                if (error.response.status === 404) {
                    MySwal.showValidationMessage(error.response.data.message)                        
                }                        
            });
    }
})