如何在執行捕獲之前等待網頁加載？

某些網頁可能需要一段時間才能加載或包含特定內容 int可能會在加載主頁後加載。在通過JavaScript加載內容的AJAX繁重的網頁上尤其如此。

GrabzIt可以檢測到何時加載網頁，但是對於上面列出的某些特定情況，它需要一些其他說明，例如在捕獲之前應使用的延遲形式，或者通過等待指定的HTML元素出現在捕獲應該開始之前使用延遲先。如果您要截取網頁的屏幕截圖或轉換HTML，則可以使用這些技術 into PDF，圖像或Word文檔，您將獲得一個高級軟件包。但是，兩種技術都被限制為最長等待時間為XNUMX秒。

這些功能也可以在我們的在線截圖或刮板機的工具。

如何在執行捕獲之前等待指定的時間？

只需指定延遲（以毫秒為單位），這就是捕獲將等待的時間。請記住，一秒有1000毫秒。以下所有示例在捕獲網頁之前等待三秒鐘。

ASP.NET
Java的
JavaScript的
Node.js的
Perl的
PHP
蟒蛇
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紅寶石

GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");
ImageOptions options = new ImageOptions();
options.Delay = 3000;
grabzIt.URLToImage("http://www.spacex.com", options);
grabzIt.SaveTo("images/result.jpg");

GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");
ImageOptions options = new ImageOptions();
options.setDelay(3000);
grabzIt.URLToImage("http://www.spacex.com", options);
grabzIt.SaveTo("images/result.jpg");

<script src="https://cdn.jsdelivr.net/npm/@grabzit/js@3.4.8/grabzit.min.js"></script>
<script>
GrabzIt("Sign in to view your Application Key").ConvertURL("http://www.spacex.com", 
{"delay": 3000}).Create();
</script>

var grabzit = require('grabzit');

var client = new grabzit("Sign in to view your Application Key", "Sign in to view your Application Secret");
var options = {"delay":"3000"};
client.url_to_image("http://www.spacex.com", options);
client.save_to("images/result.jpg", function (error, id){
    if (error != null){
        throw error;
    }
});

$grabzIt = GrabzItClient->new("Sign in to view your Application Key", "Sign in to view your Application Secret");
$options = GrabzItImageOptions->new();
$options->delay(3000);
$grabzIt->URLToImage("http://www.spacex.com", $options);
$grabzIt->SaveTo("images/result.jpg");

$grabzIt = new \GrabzIt\GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");
$options = new \GrabzIt\GrabzItImageOptions();
$options->setDelay(3000);
$grabzIt->URLToImage("http://www.spacex.com", $options);
$grabzIt->SaveTo($filepath);

grabzIt = GrabzItClient.GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret")
options = GrabzItImageOptions.GrabzItImageOptions()
options.delay = 3000
grabzIt.URLToImage("http://www.spacex.com", options)
grabzIt.SaveTo("images/result.jpg")

https://api.grabz.it/services/convert.ashx?key=Sign in to view your Application Key&format=jpg&delay=3000&url=https%3A%2F%2Fspacex.com%2F

grabzIt = GrabzIt::Client.new("Sign in to view your Application Key", "Sign in to view your Application Secret")
options = GrabzIt::ImageOptions.new()
options.delay = 3000
grabzItClient.url_to_image("http://www.spacex.com", options)
grabzItClient.save_to("images/result.jpg")

如何在執行捕獲之前等待HTML元素出現？

該技術在使用AJAX方法加載內容的網頁上特別有用。首先使用您的瀏覽器開發人員工具來標識需要等待出現的元素，記下其ID，類或製作一個更複雜的CSS選擇器。然後指定這個 CSS選擇器並且一旦該元素變得可見，便會捕獲網頁。請注意，如果有多個匹配的HTML元素，則它們將在可見時立即顯示。

ASP.NET
Java的
JavaScript的
Node.js的
Perl的
PHP
蟒蛇
REST API
紅寶石

GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");
ImageOptions options = new ImageOptions();
options.WaitForElement = "#Content";
grabzIt.URLToImage("http://www.spacex.com", options);
grabzIt.SaveTo("images/result.jpg");

GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");
ImageOptions options = new ImageOptions();
options.setWaitForElement("#Content");
grabzIt.URLToImage("http://www.spacex.com", options);
grabzIt.SaveTo("images/result.jpg");

<script src="https://cdn.jsdelivr.net/npm/@grabzit/js@3.4.8/grabzit.min.js"></script>
<script>
GrabzIt("Sign in to view your Application Key").ConvertURL("http://www.spacex.com", 
{"waitfor": "#Content"}).Create();
</script>

var grabzit = require('grabzit');

var client = new grabzit("Sign in to view your Application Key", "Sign in to view your Application Secret");
var options = {"waitForElement":"#Content"};
client.url_to_image("http://www.spacex.com", options);
client.save_to("images/result.jpg", function (error, id){
    if (error != null){
        throw error;
    }
});

$grabzIt = GrabzItClient->new("Sign in to view your Application Key", "Sign in to view your Application Secret");
$options = GrabzItImageOptions->new();
$options->waitForElement("#Content");
$grabzIt->URLToImage("http://www.spacex.com", $options);
$grabzIt->SaveTo("images/result.jpg");

$grabzIt = new \GrabzIt\GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");
$options = new \GrabzIt\GrabzItImageOptions();
$options->setWaitForElement("#Content");
$grabzIt->URLToImage("http://www.spacex.com", $options);
$grabzIt->SaveTo($filepath);

grabzIt = GrabzItClient.GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret")
options = GrabzItImageOptions.GrabzItImageOptions()
options.waitForElement = "#Content"
grabzIt.URLToImage("http://www.spacex.com", options)
grabzIt.SaveTo("images/result.jpg")

https://api.grabz.it/services/convert.ashx?key=Sign in to view your Application Key&format=jpg&waitfor=%23Content&url=https%3A%2F%2Fspacex.com%2F

grabzIt = GrabzIt::Client.new("Sign in to view your Application Key", "Sign in to view your Application Secret")
options = GrabzIt::ImageOptions.new()
options.waitForElement = "#Content"
grabzItClient.url_to_image("http://www.spacex.com", options)
grabzItClient.save_to("images/result.jpg")