Question

我正在学习javascript，并且正在尝试使用javascript_source中提供的示例在javascript中使用radiobuttons进行测验。我现在正处于这样一种情况，即我希望所选的radiobuttons标签颜色为根据所选答案更改为红色或绿色。

我把我的代码放在jsfiddle中，我能够让它在ny浏览器中工作，但我不知道为什么它似乎不适用于jsfiddle，基本思路是一样的，只有我会喜欢根据正确或错误更改所选单选按钮标签的颜色。

对此有任何帮助都会感激不尽

* *编辑* 现在jsfiddle的工作得益于以下评论

Answer 1

修正了它，http://jsfiddle.net/aEeKt/8/。我所做的只是添加以获取父<li>并根据答案添加.correct或.incorrect类。

<强> HTML

<h3>Web Design Quiz</h3>

<form name="quiz">
1. What does CSS stand for?
<ul style="margin-top: 1pt">
  <li><input type="radio" name="q1" value="Colorful Style Symbols">Colorful Style Symbols</li>
  <li><input type="radio" name="q1" value="Cascading Style Sheets">Cascading Style Sheets</li>
  <li><input type="radio" name="q1" value="Computer Style Symbols">Computer Style Symbols</li>
</ul>

2. What does DHTML stand for?
<ul style="margin-top: 1pt">
  <li><input type="radio" name="q2" value="Dramatic HTML">Dramatic HTML</li>
  <li><input type="radio" name="q2" value="Design HTML">Design HTML</li>
  <li><input type="radio" name="q2" value="Dynamic HTML">Dynamic HTML</li>
</ul>
3. Who created Javascript?
<ul style="margin-top: 1pt">
  <li><input type="radio" name="q3" value="Microsoft">Microsoft</li>
  <li><input type="radio" name="q3" value="Netscape">Netscape</li>
  <li><input type="radio" name="q3" value="Sun Micro Systems">Sun Micro Systems</li>
</ul>
4. What does CGI stand for?
<ul style="margin-top: 1pt">
  <li><input type="radio" name="q4" value="Cascading Gate Interaction">Cascading Gate Interaction</li>
  <li><input type="radio" name="q4" value="Common GIF Interface">Common GIF Interface</li>
  <li><input type="radio" name="q4" value="Common Gateway Interface">Common Gateway Interface</li>
</ul>

<input type="button" value="Get score" onClick="getScore(this.form)">
<input type="reset" value="Clear answers">
<p> Score = <strong><input class="bgclr" type="text" size="5" name="percentage" disabled></strong><br><br>
Correct answers:<br>
<textarea class="bgclr" name="solutions" wrap="virtual" rows="4" cols="30" disabled>
</textarea>
</form>

Javascript

// Insert number of questions
var numQues = 4;

// Insert number of choices in each question
var numChoi = 3;

// Insert number of questions displayed in answer area
var answers = new Array(4);

// Insert answers to questions
answers[0] = "Cascading Style Sheets";
answers[1] = "Dynamic HTML";
answers[2] = "Netscape";
answers[3] = "Common Gateway Interface";

// Do not change anything below here ...

function getScore(form) {
    var score = 0;
    var currElt;
    var currSelection;
    for (i = 0; i < numQues; i++) {
    currElt = i * numChoi;
    for (j = 0; j < numChoi; j++) {
        currSelection = form.elements[currElt + j];
        cParent = currSelection.parentNode;
        if (currSelection.checked) {
        if (currSelection.value == answers[i]) {
            score++;
            cParent.className = 'correct';
            break;
        }else{
            cParent.className = 'incorrect';
        }
        }
    }
    }
    score = Math.round(score / numQues * 100);
    form.percentage.value = score + "%";
    var correctAnswers = "";
    for (i = 1; i <= numQues; i++) {
    correctAnswers += i + ". " + answers[i - 1] + "\r\n";
    }
    form.solutions.value = correctAnswers;
}

<强> CSS

li.correct{
    color: green;
}
li.incorrect{
    color: red;
}

Answer 2

在jsfiddle中，左侧有一列有各种设置。在“选择框架”下，有一个默认为“onLoad”的下拉框。这允许您选择在页面中包含和执行javascript的方式。

当您选择'onLoad'时，声明的任何函数或变量都不是全局的。但是，使用onClick="getScore(this.form)"要求函数是全局的。相反，你应该选择'无包裹（头）'或'无包裹（身体）'。

TL;博士

从左侧的下拉框中选择“no wrap（head）”，以便您的示例在jsfiddle中工作。

在javascript中更改所选单选按钮的标签颜色

2 个答案: