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我有一個表單，我需要檢查沒有條目和類似的東西。現在，表單會將表單字段的顏色更改爲紅色，但我需要它將標籤更改爲紅色。由於標籤不是表單元素，因此我現在的方法使得更改標籤也變得非常困難。我可以實施的任何建議？使用javascript更改HTML標籤顏色
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Form Test</title>
<script type="text/javascript">
function validate(){
var errors = new Array();
for(var x = 0; x < document.forms[0].elements.length; x++){
if(document.forms[0].elements[x].type == "text"){
if(document.forms[0].elements[x].value == ""){
errors.push("The " + document.forms[0].elements[x].name + " field cannot be blank.\n");
document.forms[0].elements[x].className = "in_error";
}
}
if(document.forms[0].elements[x].type == "select-one"){
if(document.forms[0].elements[x].selectedIndex == 0){
errors.push("The " + document.forms[0].elements[x].name + " field cannot be blank.\n");
document.forms[0].elements[x].className = "in_error";
}
}
if(document.forms[0].elements[x].type == "password"){
if(document.forms[0].elements[x].value == ""){
errors.push("The " + document.forms[0].elements[x].name + " field cannot be blank.\n");
document.forms[0].elements[x].className = "in_error";
}
}
}
if(errors.length == 0){
return true;
}else{
clear_errors(errors);
show_errors(errors);
return false;
}
}
function clear_errors(errors){
var div = document.getElementById("errors");
while(div.hasChildNodes()){
div.removeChild(div.firstChild);
}
}
function show_errors(errors){
var div = document.getElementById("errors");
for(var x = 0; x < errors.length; x++){
var error = document.createTextNode(errors[x]);
var p = document.createElement("p");
p.appendChild(error);
div.appendChild(p)
}
}
window.onload = function(){
document.forms[0].onsubmit = validate;
}
</script>
<style type="text/css">
#errors{
color: #F00;
}
.in_error{
background-color: #F00;
}
</style>
</head>
<body>
<div id="errors"></div>
<form action="http://ingenio.us.com/examples/echo" method="post">
<div class="mainContainer" style="width:650px; margin: 0 auto; text-align:center;">
<div class="contactInfo" style="text-align:center; width:650px;">
<fieldset>
<legend style="text-align:left;">Contact Info</legend>
<label id="firstNameLabel" for="firstName">First Name: </label><input name="First Name" id="firstName" type="text" size="15" maxlength="15" />
<label id="lastNameLabel" for="lastName">Last Name: </label><input name="Last Name" id="lastName" type="text" size="15" maxlength="15" />
<label id="middleInitialLabel" for="middleInitial">Middle Initial: </label><input name="Middle Initial" id="middleInitial" type="text" size="4" maxlength="1" /><br /><br/>
<label id="streetAddressLabel" for="streetAddress">Street Address: </label><input name="Street Address" id="streetAddress" type="text" size="58" maxlength="55" /> <br /><br />
<label id="cityLabel" for="city">City: </label><input name="City" id="city" type="text" size="30" maxlength="28" />
<label id="stateLabel" for="state">State: </label>
<select name="State" id="state">
<option></option>
<option value="AL">Alabama</option>
<option value="AK">Alaska</option>
<option value="AZ">Arizona</option>
<option value="AR">Arkansas</option>
<option value="CA">California</option>
<option value="CO">Colorado</option>
<option value="CT">Connecticut</option>
<option value="DE">Delaware</option>
<option value="FL">Florida</option>
<option value="GA">Georgia</option>
<option value="HI">Hawaii</option>
<option value="ID">Idaho</option>
<option value="IL">Illinois</option>
<option value="IN">Indiana</option>
<option value="IA">Iowa</option>
<option value="KS">Kansas</option>
<option value="KY">Kentucky</option>
<option value="LA">Louisiana</option>
<option value="ME">Maine</option>
<option value="MD">Maryland</option>
<option value="MA">Massachusetts</option>
<option value="MI">Michigan</option>
<option value="MN">Minnesota</option>
<option value="MS">Mississippi</option>
<option value="MO">Missouri</option>
<option value="MT">Montana</option>
<option value="NE">Nebraska</option>
<option value="NV">Nevada</option>
<option value="NH">New Hampshire</option>
<option value="NJ">New Jersey</option>
<option value="NM">New Mexico</option>
<option value="NY">New York</option>
<option value="NC">North Carolina</option>
<option value="ND">North Dakota</option>
<option value="OH">Ohio</option>
<option value="OK">Oklahoma</option>
<option value="OR">Oregon</option>
<option value="PA">Pennsylvania</option>
<option value="RI">Rhode Island</option>
<option value="SC">South Carolina</option>
<option value="SD">South Dakota</option>
<option value="TN">Tennessee</option>
<option value="TX">Texas</option>
<option value="UT">Utah</option>
<option value="VT">Vermont</option>
<option value="VA">Virginia</option>
<option value="WA">Washington</option>
<option value="WV">West Virginia</option>
<option value="WI">Wisconsin</option>
<option value="WY">Wyoming</option>
</select>
<label name="zipLabel" for="zip">Zip: </label><input name="Zip" id="zip" type="text" size="7" maxlength="5" /><br /><br />
</fieldset>
</div><br /><br />
</div>
<div class="mainContainerTwo" style="width:450px; margin: 0 auto; text-align:center;">
<div class="userInfo" style="text-align:center; width:450px;">
<fieldset>
<legend style="text-align:left;">User Info</legend>
<label name="usernameLabel" for="username">Username: </label><input name="Username" id="username" type="text" size="20" maxlength="15" /><br /><br />
<label name="passwordLabel" for="password">Password: </label><input name="Password" id="password" type="password" size="20" maxlength="15" /><br /><br />
<label name="passwordConfirmLabel" for="passwordConfirm">Confirm Password: </label><input name="Confirm Password" id="passwordConfirm" type="password" size="20" maxlength="15" /><br /><br />
<input type="submit" value="Submit" />
</fieldset>
</div>
</div>
</form>
</body>
</html>
我建議簡化你的例子。 – BNL