如何调用“保存图像为...” Chrome扩展功能？ [英] How to call "Save Image As..." feature in Chrome Extension?

问题描述

Chrome扩展程序库具有很好的功能来调用下载方法...但是，当我们右键单击图像时，这种回调不能使我们为脚本执行脚本 - 实际上，右键单击图像时不会激活脚本如果它是链接的话）。

什么是Chrome的扩展命令，允许我们调用下载图像？谢谢。

解决方案

我和你有同样的问题，但我有另一种方法：使用 chrome .downloads.download api。

尝试获取图像的url，并将url传递给后台脚本，这是唯一的位置授权chrome.downloads api。

此api的一个示例使用是：

  var name = url.substr（url.lastIndexOf（/）+ 1）; 
 chrome.downloads.download（{url：url，filename：name，saveAs：false}，function（res_id）{
 if（typeof res_id ===undefined）//无法启动时下载
 {
 / *错误处理* / 
} 
其他
 {
 / *您的进一步任务* / 
} 
}）; 
  

请注意：

• 下载位置与用户的chrome设置相同。


• 文件名 可能包含路径和文件夹名称，文件名，指示下载位置的子文件夹。
  
• 无需任何弹出窗口即可自动下载 saveAs 关闭;
/ li>

以下是更多信息： https://developer.chrome.com/extensions/downloads

最后，我认为这只是一种选择。我仍然想知道这个问题的完美答案，就像我在这里问的一样：
铬扩展api是否支持直接从浏览缓存下载？

Chrome extension library has knifty feature to call download method...however such callback doesn't enable us to script for the behavior when we right click an image - in fact it won't activate when right click on an image (would if it is a link).

What is Chrome's extension command that allows us to call for downloading an image? Thanks.

解决方案

I have the same question as you, but I have an alternative to do this: use chrome.downloads.download api.

Try to obtain the url of the image, and pass the url to the background script, which is the only location authorizing chrome.downloads api.

A sample use for this api is:

var name = url.substr(url.lastIndexOf("/")+1);
chrome.downloads.download({url:url,filename:name,saveAs:false},function(res_id){
    if(typeof res_id === "undefined") // when failing to start the download
    {
        /*err handling*/
    }
    else
    {
        /*your further task*/
    }
});

Note that:

• The download location is the same as user's chrome setting.
• filename may contain the path and folder name before the file name, indicating sub-folder of the download location.
• It downloads auto without any popup windows to turn saveAs off;

Here's spec for more: https://developer.chrome.com/extensions/downloads

Finally, I think it's just an alternative. I still want to know a perfect answer to the question, like what I also asked here: Does chrome extension api support downloads directly from browsing cache?

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