Question

我想从以下html div中提取图像src：

<div class="mini-cart-image">
  <a href="http://marmot.com/equipment-tents-6-person-tents/midpines-6p/889169900013.html">
    <img src="http://s7d2.scene7.com/is/image/marmot/29510_9821_f?$thumb$" alt="Midpines 6P, Orange Spice/Arona, small" title="Midpines 6P, Orange Spice/Arona"/>
  </a>
</div>

我使用以下代码从网站上提取了这个div：

var cart_image0 = document.getElementsByClassName("mini-cart-image")[0]
var cart_image0src = cart_image0.getAttribute('src') // null

我想返回src的值。我想过使用getAttribute，但这会返回null。有没有办法用js方法做到这一点？我的另一种方法是手动解析innerHTML以获取src值。我希望有一个更好的解决方案，我不知道。

Answer 1

尝试var cart_image0 = document.querySelector(".mini-cart-image a img").getAttribute('src');

或从选择器中删除var cart_image0 = document.querySelector(".mini-cart-image img").getAttribute('src');

  string q2=  String.Format("What type of legal entity was the Company during the {0} tax years? ", YourModelName.Years);

Answer 2

您的代码中发生的是您选择的元素var cart_image0 = document.getElementsByClassName("mini-cart-image")[0]没有src属性..

这就是你在调用cart_image0.getAttribute('src')

时获得null的原因

代码

＆＃13;

// Select the cart
var cart = document.getElementsByClassName("mini-cart-image")[0];

// Select the img in the cart
var img = cart.getElementsByTagName('img')[0];

// Get the img src attribute with "img.getAttribute('src')" or shorter "img.src"
console.log(img.src);

＆＃13;

<div class="mini-cart-image">
  <a href="http://marmot.com/equipment-tents-6-person-tents/midpines-6p/889169900013.html">
    <img src="http://s7d2.scene7.com/is/image/marmot/29510_9821_f?$thumb$" alt="Midpines 6P, Orange Spice/Arona, small" title="Midpines 6P, Orange Spice/Arona"/>
  </a>
</div>

＆＃13;

请注意，使用cart.getElementsByTagName('img')，您将获得包含cart中所有图像的集合。因此，您可以迭代或使用第一个img元素，如代码示例中所示，与cart.getElementsByTagName('img')[0]。

Answer 3

您的问题是func createPDF(on path: String?, from templateURL: URL?, with subject: String?) { guard let newPDFPath = path, let pdfURL = templateURL else { return } let options = [(kCGPDFContextSubject as String): subject ?? ""] as CFDictionary UIGraphicsBeginPDFContextToFile(newPDFPath, .zero, options as? [AnyHashable : Any]) let templateDocument = CGPDFDocument(pdfURL as CFURL) let pageCount = templateDocument?.numberOfPages ?? 0 for i in 1...pageCount { //get bounds of template page if let templatePage = templateDocument?.page(at: i) { let templatePageBounds = templatePage.getBoxRect(.cropBox) //create empty page with corresponding bounds in new document UIGraphicsBeginPDFPageWithInfo(templatePageBounds, nil) let context = UIGraphicsGetCurrentContext() //flip context due to different origins context?.translateBy(x: 0.0, y: templatePageBounds.height) context?.scaleBy(x: 1.0, y: -1.0) //copy content of template page on the corresponding page in new file context?.drawPDFPage(templatePage) //flip context back context?.translateBy(x: 0.0, y: templatePageBounds.height) context?.scaleBy(x: 1.0, y: -1.0) // -->>>> Do your change here <<<<-- /* Here you can do any drawings */ } } UIGraphicsEndPDFContext() }未引用function showhide(show) { var billingaddress = document.getElementById("billingaddress"); if (show) { billingaddress.style.display = "block"; } else { billingaddress.style.display = "none"; } } function init () { var billingcheckbox = document.getElementById("billing"); if (billingcheckbox.checked) { showhide(true); } else { showhide(false); } }元素。

试试这个：

var cart_image0 = document.getElementsByClassName("mini-cart-image")[0]

如何从div中提取img src？

3 个答案: