[Javascript] Anti-Spam question on registration

Allows you to add a custom question on registration steps to prevent spam bots.

Created by @Daemon

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Anti-Spam question on registration

1º - Javascript
Placement In all pages

Code:

[panda=js]window.onload = function() {
 if(window.location.href.search('agreed=true') >= 0) {
    //*Question*//
    var jQuestion = 'How much is 10 + 10?';
 
    //*Question answer*//
    var jAnswer = 20;
    var jMulti = document.getElementsByClassName("multi")[0];
    jMulti.innerHTML += '<dl>' +
                        '    <dt>' +
                        '        <label>Answer the question: *</label>' +
                        '    </dt>' +
                        '    <dd>' +
                        '        <input class="ltr" type="text" id="answer" size="25" maxlength="25">' +
                        '        <span style="font-size: 10px;color: gray;">' + jQuestion + '</span>' +
                        '    </dd>' +
                        '</dl>';
    document.querySelector("input[name="submit"]").addEventListener("click", function(d){
    if(document.getElementById("answer").value != jAnswer) {
        d.preventDefault();
        alert("The answer is incorrect");
    }
    });
 }
};

2º - Preview

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This is a great javascript code. I think it's important to have something like this installed to prevent spambots from attacking your forum. My only frustration is when people ask such specific questions that not everyone might know like "Who is the President of India" or generic question like "Name a state that starts with M" and you have to type in the exact state when there are several states that start with the letter M. 2+2 is simply and has one answer so I like that.

This is prettty helpful to have. I'm fortunate that my forum provider already has some questions you can add or remove.

Thanks for sharing this! This is a great tool to use to prevent spam on your forum. It is good that you can customise the question too to increase the difficulty.

very good tuto thx