Send POST with JavaScript

Send POST with JavaScript

Category：JavaScript

Pub.date：2022-02-19

Write down how to send POST with JavaScrpit. The return value is received as JSON

## MDN

<a href="https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Fetch" target="_blank">https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Fetch</a>

## basic form

```
<script>
(() => {
	const _postUrl = 'https://example.com/api/aaa.php';
	const _val = 1;

const fd = new FormData();
	fd.append('val',_val);
	fetch(_postUrl, {method:'POST', body:fd})
		.then(response => response.json())
		.then(result => {
			console.log(result);
		})
		.catch(error => {
			console.error(error);
		});
})();
<script>
```

## Used in CakePHP4 API calls

Calling internal APIs while maintaining login information

```
<?php

<?= $this->Form->hidden('Customes.id',['value'=>$entity->id]) ?>
<?= $this->Form->text('Customes.note',['size'=>10,'id'=>true]) ?>

<?= $this->Form->create(null,['url'=>['controller'=>'Apis','action'=>'setCustomerValue']]) ?>
<?php $this->Form->unlockField('Customers'); ?>
<?= $this->Form->end() ?>

<script>
(() => {
	const _postUrl			= "<?= $this->Url->build(['controller'=>'Apis','action'=>'setCustomerValue']) ?>";
	const _csrfToken		= document.querySelector('form[action$="set-customer-value"] > div > input[name="_csrfToken"]').value;
	const _tokenFields		= document.querySelector('form[action$="set-customer-value"] > div > input[name="_Token[fields]"]').value;
	const _tokenUnlocked	= document.querySelector('form[action$="set-customer-value"] > div > input[name="_Token[unlocked]"]').value;
	const _tokenDebugElm	= document.querySelector('form[action$="set-customer-value"] > div > input[name="_Token[debug]"]');
	const fd = new FormData();
	fd.append('_csrfToken',_csrfToken);
	fd.append('_Token[fields]',_tokenFields);
	fd.append('_Token[unlocked]',_tokenUnlocked);
	if (_tokenDebugElm) {
		fd.append('_Token[debug]',_tokenDebugElm.value);
	}
	fd.append('Customers[id]',document.getElementById('customers-id').value);
	fd.append('Customers[note]',document.getElementById('customers-note').value);
	fetch(_postUrl, {method:'POST', body:fd})
		.then(response => response.json())
		.then(result => {
			console.log(result);
		})
		.catch(error => {
			console.error(error);
		});
})();
<script>
```

## Previous writing style using XMLHttpRequest

```
<script>
(() => {
	const _postUrl = 'https://example.com/api/aaa.php';
	const _val = 1;

const fd = new FormData();
	fd.append('val',_val);
	const xhr = new XMLHttpRequest();
	xhr.open('POST',_postUrl);
	xhr.onreadystatechange = () => {
		if ((xhr.readyState == 4) && (xhr.status == 200)) {
			const response = xhr.responseText;
			const result = JSON.parse(response);
			console.log(result);
		}
	};
	xhr.send(fd);
})();
<script>
```

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