即时通讯正考虑如何更改输入提交按钮的颜色,当所有输入都已填写完毕时,是否有人知道这一点?
我猜你可以使用php吗?
更新 我尝试了这个,但是它有点儿,它在我按退格键几次之前没有真正更新。:
$(function() {
$('form input[type=text], form input[type=email]').keydown(function() {
var empty = false;
// kører igennem alle inputs, og tjekker om de indeholder noget
$('form input[type=text], form input[type=email]').each(function() {
if ($(this).val() == '') { // hvis feltet er tomt
empty = true;
}
});
if (!$('form input[type=checkbox]').is(':checked')) {
empty = true;
}
if (empty == false) {
// hvis alle felter er udfyldt
$('form input[type=submit]').css('background-color', 'blue');
} else {
// hvis ikke alle felter er udfyldt
$('form input[type=submit]').css('background-color', 'yellow');
}
});
});
答案 0 :(得分:0)
Javascript,而不是PHP。 PHP仅在服务器端,这意味着当您看到网页时,所有PHP都已运行。
查看jquery - http://www.w3schools.com/jquery/jquery_dom_set.asp
答案 1 :(得分:-1)
检查我的小例子
<html>
<head>
<script type="text/javascript">
function check(){
var tocheck = ["text1", "text2", "text3", "email"];
var tf = document.getElementById("theform");
var ok = true;
var i;
for(i=0; i<tocheck.length; i++){
ok = ok && tf.elements[tocheck[i]].value != "";
}
document.getElementById("subm").style.color = ok ? "green" : "red";
}
</script>
</head>
<body>
<form id="theform">
Text1: <input name="text1" type="text" onchange="check()" oninput="check()"></input><br/>
Text2: <input name="text2" type="text" onchange="check()" oninput="check()" onchange="check()" oninput="check()"></input><br/>
Text3: <input name="text3" type="text" onchange="check()" oninput="check()"></input><br>
Email: <input name="email" type="email" onchange="check()" oninput="check()"></input><br/>
<input type="submit" id="subm" value="OK" style="color: red;"></input>
</form>
</body>
</html>
答案 2 :(得分:-1)
我的一位朋友,找到了一个很好的解决方案!
<script type="text/javascript">
$(function() {
function check_inputs() {
var empty = false;
// kører igennem alle inputs, og tjekker om de indeholder noget
$('form input[type=text], form input[type=email]').each(function() {
if ($(this).val() == '') { // hvis feltet er tomt
empty = true;
}
});
if (!$('form input[type=checkbox]').is(':checked')) {
empty = true;
}
if (empty == false) {
// hvis alle felter er udfyldt
$('form input[type=submit]').css({
'background-color' : '#f4d24b',
'font-size' : '16px',
'font-weight' : '700',
'color' : '#272727',
});
} else {
// hvis ikke alle felter er udfyldt
$('form input[type=submit]').css('background-color', '#1f1f1f');
}
}
$('form input[type=text], form input[type=email]').keyup(function() {
check_inputs();
});
$('form input[type=checkbox]').click(function() {
check_inputs();
});
});
</script>
答案 3 :(得分:-2)
<!DOCTYPE html> <html>
<head>
<title>Login</title>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
<script src="jquery.min.js"</script>
<style>
.btn,.input-radius {border-radius:1px!important;}
p { font-weight: bold; padding-top: 47px; } #sub{ }
</style>
<script>
jQuery(document).ready(function (){
jQuery("#sub").click(function(){ btncolor(); });
function btncolor(){
if (jQuery('#exampleInputPassword1').val().length > 0 || jQuery('#exampleInputEmail1').val().length > 0) { jQuery("#sub").css("background-color", "orange");
}
}
});
</script>
</head>
<body>
<div class="col-lg-3">
<form>
<p>LOGIN</p>
<fieldset class="form-group">
<input type="email" class="form-control input-radius" id="exampleInputEmail1" placeholder="Enter email">
</fieldset>
<fieldset class="form-group">
<input type="password" class="form-control input-radius" id="exampleInputPassword1" placeholder="Password">
</fieldset>
<button type="submit" id="sub" class="btn btn-primary grey-btn" onclick="return false;">Submit</button>
<small class="text-muted">Forgot password?</small>
</form>
</div>
</body>
</html>