html表单上的多个验证规则

时间:2014-11-17 18:39:40

标签: javascript html5 forms validation

我有一个类似于以下代码的html表单。我的问题是我想基于多个标准进行验证...数字可以是0或者它必须大于700.我使用数组作为输入名称,这使得我很难获得javascript解决方案工作。在这种情况下如何使用多个critera进行验证?

<form name="endingweights" method="post">
<input type="hidden" value="1" name="strain[]"></td><td><input type="number" step="any" name="ending[]" min="0" max="1500" required />
<input type="hidden" value="2" name="strain[]"></td><td><input type="number" step="any" name="ending[]" min="0" max="1500" required />
<input type="hidden" value="3" name="strain[]"></td><td><input type="number" step="any" name="ending[]" min="0" max="1500" required />

2 个答案:

答案 0 :(得分:1)

使用以下javascript函数进行验证。

<script>
function validateForm() {
var x = document.forms["endingweights"].elements["ending[]"];
for (var i = 0; i < x.length; i++) {
var aControl = x[i].value;
if (aControl>0 && aControl<700) {
    alert("Incorrect Weight, must be 0 or greater than 700.");
    x[i].focus();
    return false;
    }
}}
</script>

答案 1 :(得分:1)

如果您为输入分配id,则可以更轻松地通过javascript验证。这样,您可以在提交表单时检查输入的值。

<强> HTML:

<form name="endingweights" method="post">

    <!-- hidden inputs -->
    <input id="foo" type="number" min="0" max="1500" required>
    <input id="bar" type="number" min="0" max="1500" required>
    <input id="baz" type="number" min="0" max="1500" required>
    <input type="submit" value="Submit">
</form>

<强> JS:

var form = document.forms['endingweights'],
    foo  = document.getElementById('foo'),
    bar  = document.getElementById('bar'),
    baz  = document.getElementById('baz');

// validate inputs and form
form.addEventListener('submit', function(ev) {

    // stop this from auto submitting
    ev.preventDefault();
    ev.stopPropagation();        

    // make sure constraints are followed
    if ((foo.value !== 0 && foo.value <= 700) ||
        (bar.value !== 0 && bar.value <= 700) ||
        (baz.value !== 0 && baz.value <= 700))
    {
        alert("All input values must be either 0 or greater than 700");
        return false;
    }

    // perform other validations if necessary

    // submit form
    form.submit();

}, false);

演示jsfiddle

name属性在处理提交的数据时在服务器端最有用,但id在处理客户端验证时效果最佳。