admin管理员组

文章数量:1410682

I have created simple Custom Web Component using Svelte. It has been piled and seems it should work well, but there is the difficulty. I'm trying to pass into prop some variable, but getting undefined all the time, but if I'm passing some string

Result.svelte ponent

<svelte:options tag="svelte-result" />

<script>
    export let result = {metadata: {}, transfers: []};
    export let string = 'no string';
</script>

<div class="result__wrapper">
    {string}
    <div class="result__metadata">
        <div>{result.metadata.offset}</div>
        <div>{result.metadata.limit}</div>
        <div>{result.metadata.total}</div>
    </div>
</div>

When it copiled I'm using it like

<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Svelte test</title>
  <script defer src="/svelte/wapi-client/svelte-ponent.js"></script>
  
</head>
<body>
  <div id="test"></div>
</body>

<script>
  const data = {
    metadata: {
      limit: 20,
      offset: 0,
      total: 311301
    },
    transfers: [
      {
        amount: "7.95",
        identifier: "9cd9901f-44a5-4436-9aef-880354bbe2e4"
      }
    ]
  };

  document.getElementById('test').innerHTML = `
    <svelte-result string="works" result=${data}></svelte-result>`;
</script>
</html>

data variable not passed to ponent, but string passed and shown correctly... What Am I doing wrong? How can I pass data variable into ponent ?

I have created simple Custom Web Component using Svelte. It has been piled and seems it should work well, but there is the difficulty. I'm trying to pass into prop some variable, but getting undefined all the time, but if I'm passing some string

Result.svelte ponent

<svelte:options tag="svelte-result" />

<script>
    export let result = {metadata: {}, transfers: []};
    export let string = 'no string';
</script>

<div class="result__wrapper">
    {string}
    <div class="result__metadata">
        <div>{result.metadata.offset}</div>
        <div>{result.metadata.limit}</div>
        <div>{result.metadata.total}</div>
    </div>
</div>

When it copiled I'm using it like

<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Svelte test</title>
  <script defer src="/svelte/wapi-client/svelte-ponent.js"></script>
  
</head>
<body>
  <div id="test"></div>
</body>

<script>
  const data = {
    metadata: {
      limit: 20,
      offset: 0,
      total: 311301
    },
    transfers: [
      {
        amount: "7.95",
        identifier: "9cd9901f-44a5-4436-9aef-880354bbe2e4"
      }
    ]
  };

  document.getElementById('test').innerHTML = `
    <svelte-result string="works" result=${data}></svelte-result>`;
</script>
</html>

data variable not passed to ponent, but string passed and shown correctly... What Am I doing wrong? How can I pass data variable into ponent ?

  • javascript
  • web-ponent
  • innerhtml
  • svelte
Share asked Jul 24, 2020 at 10:50 vladys.bovladys.bo 7402 gold badges13 silver badges36 bronze badges 1
  • I used @Carlos Rose solution. Consider to use the code as svelte-ponent and as custom element you can have a look at: github./ivosdc/svelte-generic-crud-table – nologin Commented Jul 26, 2020 at 11:09
Add a ment  | 

2 Answers 2

Reset to default 5

You can't pass objects as attributes to custom elements. You need to stringify your object before passing it.

index.html

...
document.getElementById('test').innerHTML = `
    <svelte-result string="works" result=${JSON.stringify(data)}></svelte-result>`;
...

Foo.svelte

<svelte:options tag="svelte-result" />

<script>
    export let result = {metadata: {}, transfers: []};
    export let string = 'no string';
        
    $: _result = typeof result === 'string' ? JSON.parse(result) : result;
</script>

<div class="result__wrapper">
    {string}
    <div class="result__metadata">
        <div>{_result.metadata.offset}</div>
        <div>{_result.metadata.limit}</div>
        <div>{_result.metadata.total}</div>
    </div>
</div>

As an alternative to using JSON.stringify to pass the data to the ponent, you can pass it as a property rather than as an attribute — in other words instead of this...

document.getElementById('test').innerHTML = `
  <svelte-result string="works" result=${data}></svelte-result>`;

...you do this:

document.getElementById('test').innerHTML = `
  <svelte-result string="works"></svelte-result>`;

document.querySelector('svelte-result').result = data;

Not ideal, of course, since it means that you have to acmodate the initial undefined state and the post-initialisation state once result has been passed through, but web ponents are a bit awkward like that.

本文标签： javascriptPassing variable to Custom Svelte Web ComponentStack Overflow

版权声明：本文标题：javascript - Passing variable to Custom Svelte Web Component - Stack Overflow 内容由网友自发贡献，该文观点仅代表作者本人， 转载请联系作者并注明出处：http://www.betaflare.com/web/1744884337a2630397.html， 本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容，一经查实，本站将立刻删除。