我如何能找到DIV与某些文本?例如:
<div>
SomeText, text continues.
</div>
试图使用这样的东西:
var text = document.querySelector('div[SomeText*]').innerTEXT;
alert(text);
当然,这是行不通的。我该怎么做呢?
我如何能找到DIV与某些文本?例如:
<div>
SomeText, text continues.
</div>
试图使用这样的东西:
var text = document.querySelector('div[SomeText*]').innerTEXT;
alert(text);
当然,这是行不通的。我该怎么做呢?
当前回答
下面是XPath方法,但是使用了最少的XPath术语。
基于元素属性值的常规选择(用于比较):
// for matching <element class="foo bar baz">...</element> by 'bar'
var things = document.querySelectorAll('[class*="bar"]');
for (var i = 0; i < things.length; i++) {
things[i].style.outline = '1px solid red';
}
基于元素内文本的XPath选择。
// for matching <element>foo bar baz</element> by 'bar'
var things = document.evaluate('//*[contains(text(),"bar")]',document,null,XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,null);
for (var i = 0; i < things.snapshotLength; i++) {
things.snapshotItem(i).style.outline = '1px solid red';
}
这里是不区分大小写的,因为文本更不稳定:
// for matching <element>foo bar baz</element> by 'bar' case-insensitively
var things = document.evaluate('//*[contains(translate(text(),"ABCDEFGHIJKLMNOPQRSTUVWXYZ","abcdefghijklmnopqrstuvwxyz"),"bar")]',document,null,XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,null);
for (var i = 0; i < things.snapshotLength; i++) {
things.snapshotItem(i).style.outline = '1px solid red';
}
其他回答
因为你已经在javascript中要求它,所以你可以有这样的东西
function contains(selector, text) {
var elements = document.querySelectorAll(selector);
return Array.prototype.filter.call(elements, function(element){
return RegExp(text).test(element.textContent);
});
}
然后像这样叫它
contains('div', 'sometext'); // find "div" that contain "sometext"
contains('div', /^sometext/); // find "div" that start with "sometext"
contains('div', /sometext$/i); // find "div" that end with "sometext", case-insensitive
你可以使用这个非常简单的解决方案:
Array.from(document.querySelectorAll('div'))
.find(el => el.textContent === 'SomeText, text continues.');
from将把NodeList转换为一个数组(有多种方法可以做到这一点,如展开操作符或切片) 结果现在是一个数组,允许使用数组。Find方法,然后可以放入任何谓词。你也可以用正则表达式或任何你喜欢的东西检查textContent。
注意Array.from和Array.from。find是ES2015的特性。在没有转译器的情况下,与IE10等旧浏览器兼容:
Array.prototype.slice.call(document.querySelectorAll('div'))
.filter(function (el) {
return el.textContent === 'SomeText, text continues.'
})[0];
这里已经有很多很棒的解决方案了。但是,为了提供一个更精简的解决方案,并且更符合querySelector行为和语法的思想,我选择了一个用几个原型函数扩展Object的解决方案。这两个函数都使用正则表达式来匹配文本,但是,字符串可以作为松散搜索参数提供。
简单地实现以下函数:
// find all elements with inner text matching a given regular expression
// args:
// selector: string query selector to use for identifying elements on which we
// should check innerText
// regex: A regular expression for matching innerText; if a string is provided,
// a case-insensitive search is performed for any element containing the string.
Object.prototype.queryInnerTextAll = function(selector, regex) {
if (typeof(regex) === 'string') regex = new RegExp(regex, 'i');
const elements = [...this.querySelectorAll(selector)];
const rtn = elements.filter((e)=>{
return e.innerText.match(regex);
});
return rtn.length === 0 ? null : rtn
}
// find the first element with inner text matching a given regular expression
// args:
// selector: string query selector to use for identifying elements on which we
// should check innerText
// regex: A regular expression for matching innerText; if a string is provided,
// a case-insensitive search is performed for any element containing the string.
Object.prototype.queryInnerText = function(selector, text){
return this.queryInnerTextAll(selector, text)[0];
}
实现了这些函数后,现在可以进行如下调用:
document.queryInnerTextAll('div.link', 'go'); This would find all divs containing the link class with the word go in the innerText (eg. Go Left or GO down or go right or It's Good) document.queryInnerText('div.link', 'go'); This would work exactly as the example above except it would return only the first matching element. document.queryInnerTextAll('a', /^Next$/); Find all links with the exact text Next (case-sensitive). This will exclude links that contain the word Next along with other text. document.queryInnerText('a', /next/i); Find the first link that contains the word next, regardless of case (eg. Next Page or Go to next) e = document.querySelector('#page'); e.queryInnerText('button', /Continue/); This performs a search within a container element for a button containing the text, Continue (case-sensitive). (eg. Continue or Continue to Next but not continue)
由于数据属性中的文本长度没有限制,所以请使用数据属性!然后你可以使用常规的css选择器来选择你的元素(s)像OP想要的。
for (document.querySelectorAll("*")的常量元素){ element.dataset.myInnerText = element.innerText; } 文档。querySelector(“* [data-my-inner-text = '不同的文本。']”).style.color =“蓝色”; <div> . SomeText, text continue .</div> . SomeText, text continue 不同文本< div >。< / div >
理想情况下,您可以在文档加载时完成数据属性设置部分,并缩小querySelectorAll选择器的范围以提高性能。
我一直在寻找一种使用Regex来做类似事情的方法,并决定构建我自己的东西,如果其他人正在寻找类似的解决方案,我想分享它。
function getElementsByTextContent(tag, regex) {
const results = Array.from(document.querySelectorAll(tag))
.reduce((acc, el) => {
if (el.textContent && el.textContent.match(regex) !== null) {
acc.push(el);
}
return acc;
}, []);
return results;
}