问题
The answers given to a similar question:How to use the "required" attribute with a "radio" input field don't seem to work in this case. I am adapting a multiple choice quiz provided via radio buttons.The quiz has radio buttons built into an external js file.
How it works
The quiz is a sort of personality test, by answering the twenty questions (4 sets of 5 questions each) you get points (there are no correct answers). The sets following the first appear by clicking the "Submit Answer" button.
The points are divided into 3 bands: 0 to 22, 23 to 43, 44 to 65. Each of which is accompanied by an explanation and an image.
The script works fine, only the problem remains that the radio buttons do not have the "required" attribute. So if one clicks without selecting an answer, he still gets a score of 0.
I have tried several times make the radio button mandatory, as in this example : https://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_radio_required
The HTML page look like this:
HTML
<p id="test_status"></p>
<div id="box">
<p id="test"></p>
<p id = "after"></p>
<p id = "message"></p>
<p><img id = "picture"></p>
</div>
nothing more.
Script
/ setup initial vars
var pos = 0;
var score_all = 0;
var score = 0;
var test, test_status, question, choice, choices, chA, chB, chC, chD, chE;
var l_messagge = "";
var picture = "";
var tipo = "";
// this is a multidimensional array with 4 inner array elements with 5 elements inside them
var questions = [
{
question: "question1",
a: "answer1",
b: "answer2",
c: "answer3",
d: "answer4",
e: "answer5",
score_a: 1,
score_b: 4,
score_c: 3,
score_d: 2,
score_e: 0
},
// three more questions follow.
];
// create the get function
function get(x){
return document.getElementById(x);
}
// this function renders a question for display on the page
function renderQuestion(){
test = get("test");
//test.innerHTML = questions.length;
if(pos >= questions.length){
opis();
document.getElementById("after").style.visibility = "visible";
// get("test_status").innerHTML = "Test completed";
get("test_status").innerHTML = score_all;
test.innerHTML = "<h2> "+l_messagge+"</h2>";
document.getElementById("message").innerHTML = tipo;
document.getElementById("picture").src = picture;
// resets the variable to allow users to restart the test
pos = 0;
score_all= 0;
// stops rest of render Question function running when test is completed
return false;
}
get("test_status").innerHTML = "Question "+(pos+1)+" of "+questions.length;
get("test_status").innerHTML = score_all;
question = questions[pos].question;
chA = questions[pos].a;
chB = questions[pos].b;
chC = questions[pos].c;
chD = questions[pos].d;
chE = questions[pos].e;
// display the question
test.innerHTML = "<h3>"+question+"</h3>";
// display the answer options
// the += appends to the data we started on the line above
test.innerHTML += "<label> <input type='radio' name='choices' value='A'> "+chA+"</label><br>";
test.innerHTML += "<label> <input type='radio' name='choices' value='B' "+chB+"</label><br>";
test.innerHTML += "<label> <input type='radio' name='choices' value='C'> "+chC+"</label><br><br>";
test.innerHTML += "<label> <input type='radio' name='choices' value='D'> "+chD+"</label><br>";
test.innerHTML += "<label> <input type='radio' name='choices' value='E'> "+chE+"</label><br><br>";
test.innerHTML += "<button onclick='checkAnswer()'>Submit Answer</button>";
}
// Create a function to check the answers
function checkAnswer(){
// use getElementsByName because we have an array which it will loop through
choices = document.getElementsByName("choices");
for(var i=0; i<choices.length; i++){
if(choices[i].checked){
choice = choices[i].value; // będzie 'A', 'B' lub 'C'
if (choice == 'A' ) {score = questions[pos].score_a;}
else if (choice == 'B' ) {score = questions[pos].score_b;}
else if (choice == 'C' ) {score = questions[pos].score_c;}
else if (choice == 'D' ) {score = questions[pos].score_d;}
else
{score = questions[pos].score_e;};
}
}
// checks if answer matches the correct choice
score_all = score_all + score;
// changes position of which character user is on
pos++;
// then the renderQuestion function runs again to go to next question
renderQuestion();
}
function opis(){
if (score_all >= 0 && score_all < 4) {
picture = "img/not.jpg";
l_messagge = "Message1";
tipo = "Tipo1";
}
else if (score_all >= 4 && score_all < 7 ) {
picture = "img/gorg.jpg";
l_messagge = "Tipo2,";
}
else if (score_all >= 7 && score_all < 10 ) {
picture = "img/blip.jpg";
l_messagge = "Tipo3";
}
else if (score_all >= 10 && score_all < 13 ) {
picture = "img/plap.jpg";
l_messagge = "Tipo4";
}
else
{
picture = "img/tik.jpg";
l_messagge = "message5" ;
}
return;
}
// Add event listener to call renderQuestion on page load event
window.addEventListener("load", renderQuestion);
but without results.
The question received a response:
var myStuff = `
<label> <input type='radio' id='oRadA' name='choices' value='A' required='required'> ${chA}</label><br>
<label> <input type='radio' id='oRadB' name='choices' value='B'> ${chB}</label><br>
<label> <input type='radio' id='oRadC' name='choices' value='C'> ${chC}</label><br>
<label> <input type='radio' id='oRadD' name='choices' value='D'> ${chD}</label><br>
<label> <input type='radio' id='oRadE' name='choices' value='E'> ${chE}</label><br>
`;
test.innerHTML = myStuff;
but I am unable to make it work.When I transcribed it, the radio buttons and the answers disappeared, only the questions remain visible..
Another solution could be to insert the radio buttons directly into the html page, but I should also transfer the related javascrip part, which I don't know how to do.
As you can see I know very little about Javascript, could someone please help me? Thanks for the attention.
回答1:
Remember that two elements cannot have the same ID (bad things happen). You might not need the ID attributes (I don't know what's in the rest of your js) - anyway the form doesn't need them (forms only use the name= and value= elements).
You should only need ONE of the required attribute tags (the others won't hurt but are not needed) - but sometimes I have needed to write required="required" rather than just required.
Finally, I used modern JS template literals to make the code a little easier to read/modify.
Please let me know if this doesn't solve your problem and we'll keep troubleshooting.
var myStuff = `
<label> <input type='radio' id='oRadA' name='choices' value='A' required='required'> ${chA}</label><br>
<label> <input type='radio' id='oRadB' name='choices' value='B'> ${chB}</label><br>
<label> <input type='radio' id='oRadC' name='choices' value='C'> ${chC}</label><br>
<label> <input type='radio' id='oRadD' name='choices' value='D'> ${chD}</label><br>
<label> <input type='radio' id='oRadE' name='choices' value='E'> ${chE}</label><br>
`;
test.innerHTML = myStuff;
回答2:
The problem
I solved the problem of making mandatory to select one of the answers to the test questions, with the help of my wife, using what I would call an example of Lateral Thinking.
that is to say, by not operating on the mandatory nature of the selection but on the effects of its lack. In few words: If you don't select an answer you don't go ahead and you don't need any "required".
How
I set the initial score value to 10 (score not reachable on the first question or later) which operates as a block.
score = 10;
if the user selects the first answer the maximum value he can reach is 4 and goes to the next question. For each question the user has "score = 10", and must lower it by clicking on an answer.
if (score <10) {
score_all = score_all + score;
else {// rendering error message
get ("message"). innerHTML = "<i>" + "Please select your answer." + "</i>";
}
}
The selected answers are summed in:
score_all = score_all + score;
来源：https://stackoverflow.com/questions/63228192/using-the-required-attribute-with-dynamically-generating-radio-buttons