[英]How do I use jQuery to disable a form's submit button until every required field has been filled?
[英]disable a form submit button until a textarea has been populated?
有人可以帮忙吗,因为我尝试了各种JavaScript来使我的表单提交按钮保持禁用状态,直到用户在textarea中输入文本,但无济于事。
我希望禁用提交按钮,直到用户输入一些文本为止。 有什么建议吗?
<form action="includes/welcomebio.php" method="post" id="form12" class="form12">
<textarea id="bio" textarea name="bio" data-id="bio" placeholder="Hi, my name is Peter. I'm 22 years old from North Wales." onKeyUp="checkWordCount();" data-required="true"><?php echo htmlspecialchars($profile['bio']); ?></textarea>
<input type="submit" class="welcome-submit" name="submit" value="Next ->" id="submit"/>
</form>
<script type="text/javascript">
function disable()
{
if(document.textarea.bio.value=="")
{
document.textarea.submit.disabled=true;
}
else
{
document.textarea.submit.disabled=false;
}
}
</script>
您的代码有很多错误:
onKeyUp
调用了一个不存在的函数 这就是你想要的:
的HTML
<form action="includes/welcomebio.php" method="post" id="form12" class="form12">
<textarea id="bio" name="bio" data-id="bio" data-required="true" placeholder="Hi, my name is Peter. I'm 22 years old from North Wales.">
<?php echo htmlspecialchars($profile['bio']); ?>
</textarea>
<input type="submit" class="welcome-submit" name="submit" value="Next ->" id="submit" />
</form>
JAVASCRIPT
window.onload = function () {
document.getElementById("bio").onkeyup = checkWordCount;
checkWordCount();
};
function checkWordCount() {
if (document.getElementById("bio").value == "") {
document.getElementById("submit").disabled = true;
} else {
document.getElementById("submit").disabled = false;
}
}
您试图禁用textarea而不是Submit按钮。 您的代码不是有效的JavaScript。 最初使提交按钮保持禁用状态,仅在文本区域中包含某些内容时才启用它。 另外,由于您在文本区域中使用了占位符,因此您的文本区域永远不会为空,因此请检查
document.getElementById("bio").value = ""
除非用户更改,否则始终返回false。
尝试这个
<body onload="disable()">
<form action="includes/welcomebio.php" method="post" id="form12" class="form12">
<textarea id="bio" textarea name="bio" data-id="bio" placeholder="Hi, my name is Peter. I'm 22 years old from North Wales." onKeyUp="disable();checkWordCount();" data-required="true"></textarea>
<input type="submit" class="welcome-submit" name="submit" value="Next ->" id="submit"/>
</form>
</body>
<script type="text/javascript">
function disable()
{
if(document.getElementById("bio").value=="")
{
document.getElementById("submit").disabled=true;
}
else
{
document.getElementById("submit").disabled=false;
}
}
</script>
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