:无效和:所需的CSS伪类在选择器与多个表单元素匹配时，不适用于jQuery Travering方法 [英] :invalid and :required CSS pseudo-classes don't work with jQuery traversing methods when selector matches multiple form elements

问题描述

HTML

<input required>
<input required>
<input required>

JavaScript

/*
// Add script for noted :invalid check to work
// :required can also be made to work by modifying script, i.e. changing "invalid" to "required" where noted
// Source: http://stackoverflow.com/a/15821264/2171842
jQuery.extend(jQuery.expr[':'], {
    invalid : function(elem, index, match){ // modify pseudo-class here
        var invalids = document.querySelectorAll(':invalid'), // modify pseudo-class here
            result = false,
            len = invalids.length;

        if (len) {
            for (var i=0; i<len; i++) {
                if (elem === invalids[i]) {
                    result = true;
                    break;
                }
            }
        }
        return result;
    }
});
*/
$(document).ready(function(){
  // works
  console.log("number of invalid elements: "+$(":invalid").length); // selector matches multiple elements
  console.log("is first element invalid? "+$("input:first").is(":invalid")); // selector matches one element
  console.log("is at least one element enabled? "+$("input").is(":enabled")); // selector matches multiple elements
  // fails without additional script, :required also fails
  console.log("is at least one element invalid? "+$("input").is(":invalid")) // selector matches multiple elements
  console.log("number of invalid elements: "+$("input:first").siblings(":invalid").andSelf(":invalid").length) // selector (siblings(":invalid")) matches multiple elements
});

控制台错误:未捕获的错误:语法错误，无法识别的表达式:不支持的伪:无效.按照代码中的注释来导航问题.这是错误还是 jQuery 中不受支持的功能?

Console error: Uncaught Error: Syntax error, unrecognized expression: unsupported pseudo: invalid. Follow comments in code to navigate problem. Is this a bug or just an unsupported feature in jQuery?

小提琴

https://jsfiddle.net/cbqdp43s/

推荐答案

这是一个错误还是 jQuery 中不受支持的功能?

Is this a bug or just an unsupported feature in jQuery?

不支持的功能.:invalid , :required 不是 jQuery 扩展选择器.请参阅类别:jQuery 扩展

Unsupported features. :invalid , :required are not a jQuery extended selectors . See Category: jQuery Extensions

虽然 有属性选择器 [name] $("[required]") 应该返回具有 required 属性的元素的预期结果.

Though Has Attribute Selector [name] $("[required]") should return expected results for element having required attribute.

另见:invalid

:invalid CSS 伪类表示任何 或

内容无法根据输入类型验证的元素设置.

The :invalid CSS pseudo-class represents any <input> or <form> element whose content fails to validate according to the input's type setting.

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