我是Javascript的新手，无法弄清楚如何让我的功能同时适用于单选按钮和文本字段。
以下是表单的HTML代码
<form action="sendmail.php" method="post" name="cascader"
onsubmit="prepareEventHandlers()" id="cascader">
<div class="TargetCenter"> <p><strong><span class="asterisk">*</span>Target Center</strong> </p>
<label>
<input type="checkbox" name="TargetCountry" value="allCountries" id="TargetCountry" />
All Countries</label>
<label>
<input type="checkbox" name="TargetCountry" value="France" id="TargetCountry" />
France</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="Bolivia" id="CheckboxGroup1_1" />
Bolivia</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="North America" id="CheckboxGroup1_2" />
North America</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="United Kingdom" id="CheckboxGroup1_3" />
United Kingdom</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="Baltics" id="CheckboxGroup1_4" />
Baltics</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="Slovakia" id="CheckboxGroup1_5" />
Slovakia</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="Sweden" id="CheckboxGroup1_6" />
Sweden</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="Switzerland" id="CheckboxGroup1_7" />
Switzerland</label>
<br /> </div> <!--end of Cascade Target--> <div class="CascadeCategory"> <strong>
<span class="asterisk">*</span>Cascade Category: </strong> <label>
<input type="radio" name="cascadeCategory" value="Process" id="CascadeCategory_0" />
Process</label> <label>
<input type="radio" name="cascadeCategory" value="Training" id="CascadeCategory_1" />
Training</label> <label>
<input type="radio" name="cascadeCategory" value="Knowledge" id="CascadeCategory_2"/> Knowledge</label> <br /> </div> <!--end
of Cascade Category--> <div class="ProcessTitle"><strong><span
class="asterisk">*</span>Process Title: <input name="textfld"
type="text" id="processTitle" iname="processTitle"
onkeypress="checkFieldValue()" /> </strong><span
id="errorMessage"></span></div> <!--end of Process Title--> <div
class="CascadeType"> <strong><span class="asterisk">*</span>Cascade
Type:</strong> <label> <input type="radio" name="cascadeType"
value="Release" /> Release</label> <label>
<input type="radio" name="cascadeType" value="Update" id="CascadeType_1" />
Update</label> <label>
<input type="radio" name="cascadeType" value="Reminder" id="CascadeType_2" />
Reminder</label> <br /> </div> <!--end of Cascade Type--> <div class="QuickDescr"> <strong><span class="asterisk">*</span>Quick
Description: </strong><br /> <br /><textarea name="textfld" cols="70%"
rows="5" id="quickDescr"></textarea><span id="errorMessage2"></span>
</div> <!--end of Quick Description--> <div class="Details">
<strong><span class="asterisk">*</span>Details: </strong><br /><br/>
<textarea name="details" cols="70%" rows="10" id="details"></textarea> </div>
<!--end of Description--> <div class="DueDate"> <strong><span class="asterisk">*</span>Due
Date:</strong> <input type="text" class="Due" name="DueDate"
placeholder="mm.dd.yyyy" /> <span
class="DueDateFormat">(mm.dd.yyyy)</span></div> <!--end of Due date-->
<br /> <br /> <br /> <input name="Submit" type="submit"
class="CascadeButton" value="Send Cascade" />
<input type="reset" value="Clear Fields" class="ResetButton" />
</form>
以下是我为processTitle文本字段申请的Javascript。
function prepareEventHandlers() {
document.getElementById("cascader").onsubmit = function() {
// prevent a form from submitting if no email.
if (document.getElementById("processTitle").value == "") {
document.getElementById("errorMessage").innerHTML = "Please enter a value";
// to STOP the form from submitting
window.scrollTo(0, 0);
document.getElementById('processTitle').style.cssText = 'background-color: #f4fc99;';
// to turn the field background color
return false;
} else {
// reset and allow the form to submit
document.getElementById("errorMessage").innerHTML = "";
return true;
}
};
}
// when the document loads
window.onload = function() {
prepareEventHandlers();
};
// Changes the field color onFocus
function checkFieldValue() {
if (document.getElementById("processTitle").value != "") {
document.getElementById('processTitle').style.cssText = 'background-color: #FFF;';
document.getElementById("errorMessage").innerHTML = "";
}
else document.getElementById('processTitle').style.cssText = 'background-color: #f4fc99;';
}
答案 0 :(得分：2)
我添加了一个小功能来检查是否选中了其中一个单选按钮。请参阅javascript底部的checkRequiredRadioButtons。目前我只是将它与您现有的验证失败代码相关联。
function prepareEventHandlers() {
document.getElementById("cascader").onsubmit = function() {
// prevent a form from submitting if no email.
if (document.getElementById("processTitle").value == "" || !checkRequiredRadioButtons('cascadeType')) {
document.getElementById("errorMessage").innerHTML = "Please enter a value";
// to STOP the form from submitting
window.scrollTo(0, 0);
document.getElementById('processTitle').style.cssText = 'background-color: #f4fc99;';
// to turn the field background color
return false;
} else {
// reset and allow the form to submit
document.getElementById("errorMessage").innerHTML = "";
return true;
}
};
}
// when the document loads
window.onload = function() {
prepareEventHandlers();
};
// Changes the field color onFocus
function checkFieldValue() {
if (document.getElementById("processTitle").value != "") {
document.getElementById('processTitle').style.cssText = 'background-color: #FFF;';
document.getElementById("errorMessage").innerHTML = "";
} else document.getElementById('processTitle').style.cssText = 'background-color: #f4fc99;';
}
function checkRequiredRadioButtons(buttonsName) {
var buttonSet = document.getElementsByName(buttonsName);
for(i = 0; i < buttonSet.length; i++){
if(buttonSet[i].checked == true)
return true;
}
return false;
}<form action="sendmail.php" method="post" name="cascader" onsubmit="prepareEventHandlers()" id="cascader">
<div class="TargetCenter">
<p><strong><span class="asterisk">*</span>Target Center</strong>
</p>
<label>
<input type="checkbox" name="TargetCountry" value="allCountries" id="TargetCountry" />All Countries</label>
<label>
<input type="checkbox" name="TargetCountry" value="France" id="TargetCountry" />France
</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="Bolivia" id="CheckboxGroup1_1" />Bolivia
</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="North America" id="CheckboxGroup1_2" />North America</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="United Kingdom" id="CheckboxGroup1_3" />United Kingdom</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="Baltics" id="CheckboxGroup1_4" />Baltics
</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="Slovakia" id="CheckboxGroup1_5" />Slovakia
</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="Sweden" id="CheckboxGroup1_6" />Sweden
</label>
<label>
<input type="checkbox" name="CheckboxGroup1" value="Switzerland" id="CheckboxGroup1_7" />Switzerland
</label>
<br />
</div>
<!--end of Cascade Target-->
<div class="CascadeCategory"> <strong>
<span class="asterisk">*</span>Cascade Category: </strong>
<label>
<input type="radio" name="cascadeCategory" value="Process" id="CascadeCategory_0" />Process
</label>
<label>
<input type="radio" name="cascadeCategory" value="Training" id="CascadeCategory_1" />Training
</label>
<label>
<input type="radio" name="cascadeCategory" value="Knowledge" id="CascadeCategory_2" />Knowledge</label>
<br />
</div>
<!--end
of Cascade Category-->
<div class="ProcessTitle"><strong><span
class="asterisk">*</span>Process Title: <input name="textfld"
type="text" id="processTitle" iname="processTitle"
onkeypress="checkFieldValue()" /> </strong><span id="errorMessage"></span>
</div>
<!--end of Process Title-->
<div class="CascadeType"> <strong><span class="asterisk">*</span>Cascade
Type:</strong>
<label>
<input type="radio" name="cascadeType" value="Release" />Release</label>
<label>
<input type="radio" name="cascadeType" value="Update" id="CascadeType_1" />Update
</label>
<label>
<input type="radio" name="cascadeType" value="Reminder" id="CascadeType_2" />Reminder
</label>
<br />
</div>
<!--end of Cascade Type-->
<div class="QuickDescr"> <strong><span class="asterisk">*</span>Quick
Description: </strong>
<br />
<br />
<textarea name="textfld" cols="70%" rows="5" id="quickDescr"></textarea><span id="errorMessage2"></span>
</div>
<!--end of Quick Description-->
<div class="Details">
<strong><span class="asterisk">*</span>Details: </strong>
<br />
<br/>
<textarea name="details" cols="70%" rows="10" id="details"></textarea>
</div>
<!--end of Description-->
<div class="DueDate"> <strong><span class="asterisk">*</span>Due
Date:</strong>
<input type="text" class="Due" name="DueDate" placeholder="mm.dd.yyyy" /> <span class="DueDateFormat">(mm.dd.yyyy)</span>
</div>
<!--end of Due date-->
<br />
<br />
<br />
<input name="Submit" type="submit" class="CascadeButton" value="Send Cascade" />
<input type="reset" value="Clear Fields" class="ResetButton" />
</form>
如果您正在尝试动态确定是否有文本框或单选按钮，则可以调用Element.getAttribute（'type'）并进行比较。如：
var allInputs = document.getElementsByTagName('input');
for(i = 0; i < allInputs.length; i++){
if(allInputs[i].getAttribute('type') == 'radio'){
//Do radio button handling
} else if(allInputs[i].getAttribute('type') == 'text'){
//Do textbox handling
}
}
但是，如果你这样做，你需要注意，对于单选按钮，你将迭代组中的所有单选按钮，检查和取消选中。以及提交和重置按钮。
答案 1 :(得分：1)
也许您应该尝试使用javascript getElementsByTagName() method ：
function myFunction() {
var x = document.getElementsByTagName("input");
for (var i=0; i<x.length; i++){
if(x[i].value==""){
x[i].style.backgroundColor="red";
}
}
}