如何使用 XPath 选择任何深度的子元素? [英] How do I select child elements of any depth using XPath?

问题描述

假设我有这个(简化):

Suppose I have this (simplified):

<form id="myform">
    <!-- some input fields -->
    <input type="submit" value="proceed"/>
</form>

然后我可以通过XPath//form[@id='myform']/input[@type='submit']选择提交按钮.太好了.

Then I can select the submit button by XPath //form[@id='myform']/input[@type='submit']. Great.

但是，我的模板可能会更改，我希望在提交按钮所在的深度方面具有灵活性.它可能被放在一张桌子上，像这样:

However, my templates might change and I want to be flexible in the depth in which the submit button is located. It might be put in a table, like this:

<form id="myform">
    <!-- some input fields -->
    <table><tr><td>
           <input type="submit" value="proceed"/>
    </td></tr></table>
</form>

我知道我可以选择属于孙的元素，但我不能选择任何深度的 Grand-grand-grand-...-childeren.例如:

I know I can select elements which are grandchildren, but I can't select grand-grand-grand-...-childeren of any depth. E.g.:

• //form[@id='myform']/*/input[@type='submit'] 只选择孙辈，没有进一步的深度.
• //form[@id='myform']/*/*/input[@type='submit'] 只选择曾孙，没有进一步或更少的深度.
• //form[@id='myform']/**/input[@type='submit'] 无效.

• //form[@id='myform']/*/input[@type='submit'] only selects grand-children, no further depths.
• //form[@id='myform']/*/*/input[@type='submit'] only selects grand-grand-children, no further or less depths.
• //form[@id='myform']/**/input[@type='submit'] is not valid.

那么，如何在不使用元素 ID 的情况下可靠地选择此提交按钮?

So, how do I select this submit button reliably without using element IDs?

推荐答案

大功告成.只需使用:

//form[@id='myform']//input[@type='submit']

// 快捷方式也可以在表达式中使用.

The // shortcut can also be used inside an expression.

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