Question

我这里有这个简单的Html代码。

<form action="" method="post">
    Text Box:<input type="text" name="host" value="default value" size=30 onchange="updateTextBox()" />
    <input type="submit" name="submit" value="update value in text box to current value"/>
</form>

每次单击按钮，我都希望文本框的默认值更新为我最近输入的值。

Answer 1

<script>
    /* give a name to the form and write it where "form_name" is */
    var newText = document.forms["form_name"]["host"].value;

    /* add this chunk in the submit button (onclick = "changeText()") */
    function changeText()
    {
        /* give an id to the text box input tag and replace "input_id" with that */
        document.getElementById("input_id").value = newText; 
    }
</script>

每个输入都会更新HTML文本框默认值

1 个答案: