search

shinokada / svelte-utterances

svelte-utterances.vercel.app
12 stars 1 forks source link

err TypeError: Cannot read properties of undefined (reading 'contentWindow') #6

Open shinokada opened 2 years ago

shinokada commented 2 years ago

The following code returns error:

...
const iFrame = document.getElementsByTagName("iframe")[0];
        iFrame.contentWindow.postMessage(
...

err TypeError: Cannot read properties of undefined (reading 'contentWindow') at Object.u.$$.update (doc.svelte-98be7cc1.js:1:1097) at ve (vendor-60873d7e.js:1:7294) at new be (doc.svelte-98be7cc1.js:1:1258) at de (doc.svelte-98be7cc1.js:1:3349) at ve (vendor-60873d7e.js:1:7340) at new $e (doc.svelte-98be7cc1.js:1:5518) at zt (index.md-070d2b67.js:18:3876) at ve (vendor-60873d7e.js:1:7340) at new Kt (index.md-070d2b67.js:18:4295) at Array.Ve (start-7fe98c40.js:1:2515)

shinokada commented 2 years ago

This can be solved using if statement:

if (iFrame) {
          iFrame.contentWindow.postMessage(
            { type: "set-theme", theme },
            "https://utteranc.es"
          );
        }