循环并验证多个无线电输入 [英] Loop through and validate multiple radio inputs

问题描述

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：

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>

我的意图是检查所有输入，如果没有，他们就无法提交表格。每个问题我有10个无线电输入，表格有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？我将如何循环所有25个问题？

My intention is to make all inputs checked, and if not, they can't submit the form. I have 10 radio inputs for each question, and the form has 25 questions, so I use Dquestion['number'] for each name. I am using this code to test but the Dquestion[2] can't be checked. Why? How am I going to loop all 25 questions?

我尝试了这段代码，但它不起作用：

I tried this code, but it didn't work:

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;
}

推荐答案

我会把每一套包裹起来与div周围的特定问题有关的单选按钮，并检查每个div以查看是否至少检查了一个单选按钮。

I would wrap each set of radio buttons pertaining to a particular question around a div and check each div to see if at least one radio button is checked.

<form id="form1" name="form1" action="#" method="post" onsubmit="return validateForm();"> 
    <p>First time visitor?:</p>
    <div class="question">
        <label for="s1">Yes</label>
        <?php for($i=1; $i<=10; $i++){?><input type="radio" value="<?=$i?>"> <?=$i?> <?php } ?>
    </div>
            <br/>
    <div class="question">
        <label for="s2">No</label>
        <?php for($i=1; $i<=10; $i++){?><input type="radio" value="<?=$i?>"> <?=$i?> <?php } ?>
    </div>
            <br/>
    <div class="question">
         <label for="s3">Cool</label>
        <?php for($i=1; $i<=10; $i++){?><input type="radio" value="<?=$i?>"> <?=$i?> <?php } ?>
    </div>
        <br/> 
    <input type="submit" value="Submit"><br/>
</form>

JS：

JS:

function validateForm() {
        var questions = document.getElementsByClassName("question"),
            formValid = true;
        for( var j=0; j<questions.length; j++ ) {
            if( !isOneInputChecked(questions[j], "radio") ) {
                formValid = false;
            }
        }
        alert(formValid ? "Submission Succesfull!" : "Submission Failed!");
        return formValid;
    }
    function isOneInputChecked(sel) {
        // All <input> tags...
        var inputs = sel.getElementsByTagName('input');
        for (var k=0; k<inputs.length; k++) {
            // If you have more than one radio group, also check the name attribute
            // for the one you want as in && chx[i].name == 'choose'
            // Return true from the function on first match of a checked item
            if( inputs[k].checked )
                return true;
        }
        // End of the loop, return false
        return false;
    }

JSFiddle：

这是一个有效的 JSFiddle 供参考。

isOneInputChecked（）从Michael Berkowski的回复中获取的函数在另一个帖子中（链接）。

isOneInputChecked() function taken from Michael Berkowski's reply in a different thread (link).

这篇关于循环并验证多个无线电输入的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！