Add URI Fragment support

Fix #13

Les champs disponibles sont:
lastname,firstname,birthday,placeofbirth,address,city,zipcode,reason
- "reason" peut etre repete plusieurs fois pour cocher plusieurs motifs.

- "autogenpdf" simule un click pour une generation automatique du pdf.

exemple:
http://.../#lastname=Dupont&firstname=Jean&birthday=01/01/1950&placeofbirth=Paris&address=zzz&city=Paris&zipcode=75000&reason=travail&reason=achats&autogenpdf

src/js/main.js

@@ -7,9 +7,11 @@ import './check-updates'
 import { prepareForm } from './form-util'
 import { warnFacebookBrowserUserIfNecessary } from './facebook-util'
 import { addVersion } from './util'
+import { autoFill } from './util'
 import { createForm } from './form'
 
 warnFacebookBrowserUserIfNecessary()
 createForm()
 prepareForm()
 addVersion(process.env.VERSION)
+autoFill()

src/js/util.js

@@ -33,3 +33,26 @@ export function addVersion (version) {
     'version',
   ).innerHTML = `${new Date().getFullYear()} - ${version}`
 }
+
+export function autoFill() {
+  const params = new URLSearchParams(
+    window.location.hash.substr(1) // skip the first char (#)
+    );
+  const fields = ["lastname", "firstname", "birthday", "placeofbirth",
+                  "address", "city", "zipcode"]
+  function fillField(f) {
+     if (params.has(f) == true) {
+       document.getElementById("field-"+f).value = params.get(f);
+     }
+  }
+  fields.forEach(fillField);
+
+  function checkReason(r) {
+    document.getElementById("checkbox-"+r).checked = true;
+  }
+  params.getAll("reason").forEach(checkReason);
+
+  if(params.has("autogenpdf") == true) {
+    document.getElementById("generate-btn").click();
+  }
+}