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javascript - 如何从标签 api 响应中检索 png (javascript)

转载 作者:行者123 更新时间:2023-12-05 04:40:50 25 4
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我正在尝试通过 labelary.com API 将 ZPL 字符串转换为 png 图像。

我能够发送获取请求并收到响应。但是,当我查看 chrome 开发工具中的网络选项卡时,我可以在“预览”选项卡中看到 png 图像,但响应选项卡是空的,我将如何保存我可以在预览窗口中看到的 png img ?

这是我的代码:

const generateLabelBtn = document.getElementById('generateLabelBtn');

async function requestLabel(zplString) {

const response = await fetch(`http://api.labelary.com/v1/printers/8dpmm/labels/4x6/0/`, {
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
},
body: JSON.stringify(zplString),
})

console.log(response);
}

document.getElementById("generateLabelBtn").onclick = function() {
requestLabel(test)
};


const test = `^XA

^FX Top section with logo, name and address.
^CF0,60
^FO50,50^GB100,100,100^FS
^FO75,75^FR^GB100,100,100^FS
^FO93,93^GB40,40,40^FS
^FO220,50^FDIntershipping, Inc.^FS
^CF0,30
^FO220,115^FD1000 Shipping Lane^FS
^FO220,155^FDShelbyville TN 38102^FS
^FO220,195^FDUnited States (USA)^FS
^FO50,250^GB700,3,3^FS

^FX Second section with recipient address and permit information.
^CFA,30
^FO50,300^FDJohn Doe^FS
^FO50,340^FD100 Main Street^FS
^FO50,380^FDSpringfield TN 39021^FS
^FO50,420^FDUnited States (USA)^FS
^CFA,15
^FO600,300^GB150,150,3^FS
^FO638,340^FDPermit^FS
^FO638,390^FD123456^FS
^FO50,500^GB700,3,3^FS

^FX Third section with bar code.
^BY5,2,270
^FO100,550^BC^FD12345678^FS

^FX Fourth section (the two boxes on the bottom).
^FO50,900^GB700,250,3^FS
^FO400,900^GB3,250,3^FS
^CF0,40
^FO100,960^FDCtr. X34B-1^FS
^FO100,1010^FDREF1 F00B47^FS
^FO100,1060^FDREF2 BL4H8^FS
^CF0,190
^FO470,955^FDCA^FS

^XZ`
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello World!</title>
<meta
http-equiv="Content-Security-Policy"
content="script-src 'self' 'unsafe-inline';"
/>
</head>
<body>
<button id="generateLabelBtn">Generate Label</button>
</body>
</html>

最佳答案

问题是您试图在控制台上打印响应,而不是将响应图像附加到主体上。要从响应中获取图像,您需要将其转换为 Blob,然后从中获取图像的 url。 To know more about Blobs

在 html 代码中,只需在要显示图像的地方添加一个容器 div

<div id="container"></div>

JS代码

 const generateLabelBtn = document.getElementById("generateLabelBtn");

async function requestLabel(zplString) {
const response = await fetch(
`http://api.labelary.com/v1/printers/8dpmm/labels/4x6/0/`,
{
method: "POST",
headers: {
"Content-Type": "application/x-www-form-urlencoded",
},
body: JSON.stringify(zplString),
}
);

console.log(response);

const responseBlob = await response.blob();
const img = document.createElement('img');
img.src = URL.createObjectURL(responseBlob);
document.querySelector(`#container`).append(img);
}

generateLabelBtn.addEventListener("click", (e) => {
requestLabel(test);
});

const test = `^XA

^FX Top section with logo, name and address.
^CF0,60
^FO50,50^GB100,100,100^FS
^FO75,75^FR^GB100,100,100^FS
^FO93,93^GB40,40,40^FS
^FO220,50^FDIntershipping, Inc.^FS
^CF0,30
^FO220,115^FD1000 Shipping Lane^FS
^FO220,155^FDShelbyville TN 38102^FS
^FO220,195^FDUnited States (USA)^FS
^FO50,250^GB700,3,3^FS

^FX Second section with recipient address and permit information.
^CFA,30
^FO50,300^FDJohn Doe^FS
^FO50,340^FD100 Main Street^FS
^FO50,380^FDSpringfield TN 39021^FS
^FO50,420^FDUnited States (USA)^FS
^CFA,15
^FO600,300^GB150,150,3^FS
^FO638,340^FDPermit^FS
^FO638,390^FD123456^FS
^FO50,500^GB700,3,3^FS

^FX Third section with bar code.
^BY5,2,270
^FO100,550^BC^FD12345678^FS

^FX Fourth section (the two boxes on the bottom).
^FO50,900^GB700,250,3^FS
^FO400,900^GB3,250,3^FS
^CF0,40
^FO100,960^FDCtr. X34B-1^FS
^FO100,1010^FDREF1 F00B47^FS
^FO100,1060^FDREF2 BL4H8^FS
^CF0,190
^FO470,955^FDCA^FS

^XZ`;

关于javascript - 如何从标签 api 响应中检索 png (javascript),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/70194224/

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