Question

我正在尝试使用.innerhtml在按钮上方输入错误消息。我想我已经接近这个了，但是我被困住了。我认为这是一个非常简单的语义错误，因为我是JS的新手。

var sel  = document.getElementById("stateType");

    switch(sel.value) {
        case "VA":
            location.href = "http://www.test1.com";
            break;
        case "MD":
            location.href = "http://www.test2.com";
            break;
        case "IL":
            location.href = "http://www.test3.com";
            break;
        case "TX":
            location.href = "http://www.test4.com";
            break;
        case "other":
            location.href = "http://www.test5.com";
            break;
        // oh dear we have selected a wrong option
        default:
            document.getElementById('error').innerHTML = 'Fred Flinstone';
    }
}

Answer 1

在你的小提琴中，你忘了包括功能头。添加之后，它对我有用。

updated fiddle

function validate(){
    var sel  = document.getElementById("stateType");

    switch(sel.value) {
        case "VA":
            location.href = "http://www.test1.com";
            break;
        case "MD":
            location.href = "http://www.test2.com";
            break;
        case "IL":
            location.href = "http://www.test3.com";
            break;
        case "TX":
            location.href = "http://www.test4.com";
            break;
        case "other":
            location.href = "http://www.test5.com";
            break;
        // oh dear we have selected a wrong option
        default:
            document.getElementById('error').innerHTML = 'Fred Flinstone';
    }
}

Answer 2

从小提琴中，这就是出错的地方。

（使用Chrome并打开控制台，您会看到它）

<script type='text/javascript'>//<![CDATA[ 
window.addEvent('load', function() {
var sel  = document.getElementById("stateType");

switch(sel.value) {
    case "VA":
        location.href = "http://www.test1.com";
        break;
    case "MD":
        location.href = "http://www.test2.com";
        break;
    case "IL":
        location.href = "http://www.test3.com";
        break;
    case "TX":
        location.href = "http://www.test4.com";
        break;
    case "other":
        location.href = "http://www.test5.com";
        break;
    // oh dear we have selected a wrong option
    default:
        document.getElementById('error').innerHTML = 'Fred Flinstone';
}
}
var sel  = document.getElementById("stateType");
});//]]>

var sel位于错误的位置并打破它（无论如何都是第二个变种）。

JavaScript：.innerhtml错误消息表单验证

2 个答案: