检查文本字段值的长度 [英] checking text field value length

问题描述

我试图查看文本字段长度是否至少为一定长度。这是我的代码：

I am trying to see if the text field length is at least a certain length. here is my code:

<form name="form2" id="form2" onsubmit="return validate()">
length 4: <input type="text" name = "t" id="t" />
<input type="button" name="submit" value="submit" />
</form>

<script>
function validate() {
    document.write("good");
    submitFlag = true;
    if(document.form2.t.value.length!=4){
        submitFlag=false;
        alert("ivalid length - 4 characters needed!");
    }
    return submitFlag;
}
</script>

当我点击提交时，没有任何反应。

when I click submit, nothing happens.

推荐答案

将提交按钮更改为type =submit。表单永远不会被提交，因此不会调用validate函数。

Change your submit button to type="submit". The form is never getting submitted so the validate function isn't being called.

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