Is there a way for me to transfer a variable to a URL?

I'm attempting to send an email that includes a link with a value obtained from Firebase. While I can successfully retrieve the value, I am unsure how to add it to the existing link. Here is my code snippet:

sendinvite() {
      var user = firebase.auth().currentUser;
      var uid = user.uid;

      firebase.database().ref('/userlist/' + uid + '/' + 'hashKey').once('value').then(function(snapshot) {
        var hashKey = (snapshot.val());
        console.log(hashKey)
      });

      var bcc = [];
      for(var e in this.emailinputs){
        if (this.emailinputs[e].email==null || this.emailinputs[e].email=="" || !this.emailinputs[e].email.includes("@") || !this.emailinputs[e].email.includes("."))
        {
          let alert = this.alerCtrl.create({
            title: 'Error!',
            message: 'There was an error with an email address you entered.',
            buttons: ['Ok']
          });
          alert.present()
        }else {
          bcc.push(this.emailinputs[e].email);
        }
      }
      if(bcc.length > 0) {
        let email = {
          bcc: bcc,
          subject: 'Nudget Invite',
          body: '<a href="https://nudget-72ee4.firebaseapp.com/?hashkey='+hashKey+'">Join my grocery list!</a>',
          isHtml: true
        };
        this.emailComposer.open(email);
      }
}

I aim to include the hashKey variable in the URL attached in the email message but need guidance on how to accomplish this.

Edit 1

I have modified the body section to combine the variable with the string. However, I am unsure where to appropriately integrate the hashkey retrieved from Firebase for proper referencing.

Answer №1

The issue I am observing is that the 'hashkey' variable is scoped only within the firebase...function(snapshot) block. It would be more effective if you define it at the top near the 'uid' variable, allowing all sections of the code to access it.

Within the snapshot function, consider removing the 'var' declaration in front of hashkey to simply set the existing variable.

Additionally, ensure that 'hashkey' has a non-blank value before proceeding with sending the email.

Hope this helps, Jim

Answer №2

I pinpoint the issue right here:

firebase.database().ref('/userlist/' + uid + '/' + 'hashKey').once('value').then(function(snapshot) {
    var hashKey = (snapshot.val());
    console.log(hashKey)
});

The problem arises when you define the var called hashKey within an anonymous function and then attempt to access hashKey outside of that function.

To resolve this, consider the following approach:

var user = firebase.auth().currentUser;
var uid = user.uid;
var hashKey = null;

firebase.database().ref('/userlist/' + uid + '/' + 'hashKey').once('value').then(function(snapshot) {
    hashKey = (snapshot.val());
    console.log(hashKey)
});

... clipped ...

    body: '<a href="https://example-93jd2.firebaseapp.com/?hashkey='+ ((hashKey == null) ? 'no-key' : hashKey) +'">Join my grocery list!</a>',
    
... clipped ...

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