如何从 Angular 4 中的 MySQL 表填充下拉框

Question

In PHP and HTML I just simply used to fetch data in array and show it in the select box as shown below:

<?php

mysql_connect('hostname', 'username', 'password');
mysql_select_db('database-name');

$sql = "SELECT nameid FROM PC";
$result = mysql_query($sql);

echo "<select name='PcID'>";
while ($row = mysql_fetch_array($result)) {
    echo "<option value='" . $row['nameid'] . "'>" . $row['nameid'] . "</option>";
}
echo "</select>";

?>

I mean I can connects to a MySQL database, issue query, and outputs <option> tags for a <select> box from each row in the table

But how do I achieve same in Angular 4?

The best way is to fetch data in a JSON and then show it on the frontend by creating an API? Or there is some other way?

Answer 1

The best way would be to return the data as JSON. Using rxjs subscribe you can fetch the data like this

 users:any[]= [];
fetchData(){
  this.http.get("users/all-users")
      .subscribe((res)=>{
        this.users = res.data
       })

  }

So in the html it would be something like

<select>
    <option *ngFor="let user of users" value="user.id">
  {{ user.name }}
</option>

 </select>

So in your php return data like this

function getUsers(){

  mysql_connect('hostname', 'username', 'password');
   mysql_select_db('database-name');

   $sql = "SELECT nameid FROM PC";
   $result = mysql_query($sql);

  return ["data"=>$result];
 }

Advice though instead of using normal php use a framework like laravel/yii2 which makes returning data easy.

NB: Angular4 is a frontend framework so you cannot using echo like you would use it in a php framework.