检查输入值长度

Question

输入检查有问题.如果输入长度小于3,我不想发送请求.

我的表格:

<form method='post' action=''>
    Alb?ma nosaukums: # # this is the input --><input id='titleeee' type='text' name'album_title' /><br />

    Bilde Nr 1: <input type='file' name='pic_nr1' /><br />
    Bilde Nr 2: <input type='file' name='pic_nr2' /><br />
    Bilde Nr 3: <input type='file' name='pic_nr2' /><br />

    Akt?vs*: 
    <select>
        <option>J?</option>
        <option>N?</option>
    </select>

    <br />

    <input Onclick='testlenght(document.getElementById("titleeee"), "Tavs alb?ma nosaukums ir pa ?su!", "3")' type='submit' value='Pievienot' />
</form>

Answer 1

您可以在onsubmit处理程序中添加表单,例如:

<form onsubmit="return validate();">

</form>


<script>function validate() {
 // check if input is bigger than 3
 var value = document.getElementById('titleeee').value;
 if (value.length < 3) {
   return false; // keep form from submitting
 }

 // else form is good let it submit, of course you will 
 // probably want to alert the user WHAT went wrong.

 return true;
}</script>

Answer 2

<input type='text' minlength=3 /><br />

如果浏览器支持html5，

它将自动验证标签中的属性（最小长度）

但 Safari(iOS) 无法使用