如何使用 xpath 按文件名查找图像标签 [英] How to find an image tag by filename using xpath

问题描述

我正在使用 capybara 运行一些黄瓜功能，我需要检查是否正在显示某个图像.

I am running some cucumber features using capybara and I need to check if a certain image is being shown.

我尝试了这个 xpath 匹配，但显然函数 matches 不可用:

I tried this xpath match but apparently the function matches is not available:

//img[matches(@src, "my_image.png")]

推荐答案

你不需要任何 matches 函数.使用:

You don't need any matches function. Use:

//img[@src='my_image.png']

或者，如果路径可以在您要匹配的部分之前包含文本:

Or, if the path can include text before the portion you want to match:

//img['my_image.png'=substring(@src, string-length(@src) - 11)]

第二个表达式模仿 ends-with 函数.

This second expression imitates an ends-with function.

如果您不喜欢对子字符串长度进行硬编码，请使用:

If you don't like hard-coding the substring length, then use:

//img['my_image.png'=substring(@src, 
          string-length(@src) - string-length('my_image.png') + 1)]

为了完整性:在某些情况下，以下是可以接受的:

For completeness: in some cases, the following is acceptable:

//img[contains(@src, 'my_image.png')]

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