javascript - 循环并验证多个 radio 输入

Question

JS:

function validateForm() {
    var radios = document.getElementsByName("Dquestion[1]");
    var formValid = false;

    var i = 0;
    while (!formValid && i < radios.length) {
        if (radios[i].checked) formValid = true;
        i++;        
    }

    if (!formValid) alert("Must check some option!");
    return formValid;
}

PHP:

<form name="form1" action="#" onsubmit="return validateForm()" method="post"> 
    First time visitor?:<br/>
        <label for="s1">Yes</label>
        <?php for($i=1; $i<=10; $i++){?><td><input type="radio" name="Dquestion[1]" value="<?=$i?>"> <?=$i?> </td><?php } ?>
        <br/>
        <label for="s2">No</label>
        <?php for($i=1; $i<=10; $i++){?><td><input type="radio" name="Iquestion[1]" value="<?=$i?>"> <?=$i?> </td><?php } ?>
        <br/>
         <label for="s3">cool</label>
        <?php for($i=1; $i<=10; $i++){?><td><input type="radio" name="Dquestion[2]" value="<?=$i?>"> <?=$i?> </td><?php } ?>
        <br/> 
    <input type="submit" value="Submit"><br/>
</form>

我的目的是检查所有输入，如果没有，他们就无法提交表单。每个问题都有 10 个 radio 输入，表单有 25 个问题，因此我对每个名称使用 Dquestion['number']。我正在使用此代码进行测试，但无法检查 Dquestion[2] 。为什么？我如何循环回答所有 25 个问题？

我尝试了这段代码，但它不起作用:

var Dnames = ['Dquestion[1]','Dquestion[2]']

function validateForm() {

    var radios = [];
    var formValid = false;

    for (var i = 1; i<= Dnames.length; i++){
        var radios = document.getElementsByName(Dnames[i]);
        var j = 0;
        while(!formValid && j < radios.length){
            if(radios[j].checked) formValid = true;
            j++
        }
    }

    if (!formValid) alert("Must check some option!");
    return formValid;
}

Answer 1

var radios = document.getElementsByName('Dquestion[1]'); // you understand this part
var checked = Array.prototype.some.call(radios, function(radio){
    return radio.checked;
});

假设我有一个数组:

var arr = [1,2,3,4,5,6];
arr.some(function(num){
 return boolean // meaning return something that is true or false like "return num < 3
});
//when it loops through it will return that boolean each time
// it'll return 1 < 3: true, 2 < 3: true 3 < 3: false, 4 < 3: false, 5 < 3: false, 6 < 3: false
//the some function after it's done looping is checking if some are true which is true it returned 3 trues
//so checked = true

if(checked){
    console.log('one is checked');
} else {
    console.log('please check one');
};