如何确认所选的单选按钮？

Question

我创建了三个单选按钮。 我想运行一个函数OnClick，要求用户确认所选的单选按钮，并告诉检查的单选按钮值是什么。 此外，如果用户未确认已选中的单选按钮，则将取消选择单选按钮。 这是我写的代码但失败了。

<input id="a1" type="radio" name="type" value="A1" onClick= "confirmation();" />A1
<input id="a2" type="radio" name="type" value="A2" onClick="confirmation();" />A2
<input id="a3" type="radio" name="type" value="A3" onClick="confirmation();"/>A3

使用Javascript

function confirmation() {


if (document.getElementById('a1').checked ) {
ty = document.getElementById('a1').value
var ask= confirm("You have chosen " + ty + " as your type \n If you have chosen the right type, Click Ok! " )

}
if (document.getElementById('a2').checked) {
level = document.getElementById('a2').value;
var ask= confirm("You have chosen " + ty + " as your Examination Level \n If you have chosen the right type, Click Ok! " )
}
if (document.getElementById('a3').checked) {
ty = document.getElementById('r1').value;
var ask= confirm("You have chosen " + ty + " as your type \n If you have chosen the right type, Click Ok! " )
}
    if (ask==true) {
        alert("You clicked ok");
    }
    if (ask==false) {
        alert("You clicked cancel");
    }
}

Answer 1

功能可以更简单。 您不必检查所有按钮，因为您可以将当前按钮传递给函数，如onclick="confirmation(this)" 。 要取消选中单选按钮，您可以将checked属性设置为false 。

 function confirmation(radio) { var ask = confirm("You have chosen " + radio.value + " as your type \\n If you have chosen the right type, Click Ok! ") if (ask) { alert("You clicked ok"); } else { alert("You clicked cancel"); radio.checked = false; } } 

 <input id="a1" type="radio" name="type" value="A1" onclick="confirmation(this)" />A1 <input id="a2" type="radio" name="type" value="A2" onclick="confirmation(this)" />A2 <input id="a3" type="radio" name="type" value="A3" onclick="confirmation(this)" />A3 

Answer 2

我想你可以总结一下：

 function confirmation(obj) { obj.checked ? confirm("You have chosen " + obj.value + " as your type \\n If you have chosen the right type, Click Ok!") ? alert("You clicked ok") : obj.checked = false : ""; } 

 <input id="a1" type="radio" name="type" value="A1" onClick="confirmation(this);" />A1 <input id="a2" type="radio" name="type" value="A2" onClick="confirmation(this);" />A2 <input id="a3" type="radio" name="type" value="A3" onClick="confirmation(this);" />A3 

this传递给函数。 this指的是DOM对象。

Answer 3

取消选择时，您需要循环显示单选按钮以清除它们。 您的代码中也有一些小的语法错误，这些错误在下面进行了更正：

var ty;
function confirmation() {
    if (document.getElementById('a1').checked) {
        ty = document.getElementById('a1').value
        var ask = confirm("You have chosen " + ty + " as your type \n If you have chosen the right type, Click Ok! ")
    }
    if (document.getElementById('a2').checked) {
        ty = document.getElementById('a2').value;
        var ask = confirm("You have chosen " + ty + " as your Examination Level \n If you have chosen the right type, Click Ok! ")
    }
    if (document.getElementById('a3').checked) {
        ty = document.getElementById('a3').value;
        var ask = confirm("You have chosen " + ty + " as your type \n If you have chosen the right type, Click Ok! ")
    }
    if (ask == true) {
        alert("You clicked ok");
    }
    if (ask == false) {
        var elem = document.getElementsByName('type');
        for(var i=0;i<elem.length;i++) elem[i].checked = false;
        alert("You clicked cancel");
    }
}

jsFiddle例子

Answer 4

你可以像这样使用 -

 <input type="radio" value="1" onclick="return confirmation()" name="collections"> <input type="radio" value="2" onclick="return confirmation()" name="collections"> <input type="radio" value="3" onclick="return confirmation()" name="collections"> <script> function confirmation(){ if(confirm("Are you sure!")) { //do your job } else { return false; } } </script>