检查输入值长度 [英] Check input value length

问题描述

我在输入检查方面遇到问题.如果输入长度小于 3，我不想发送请求.

I have a problem with input checking. I don't want to send the request if the input length is less than 3.

我的表格:

<form method='post' action=''>
    Albūma 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 />

    Aktīvs*: 
    <select>
        <option>Jā</option>
        <option>Nē</option>
    </select>

    <br />

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

推荐答案

您可以添加一个表单 onsubmit 处理程序，例如:

You can add a form onsubmit handler, something like:

<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>

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