我需要一些帮助。我被困在javascript的某些部分。
我需要做的是制作表格并展示自定义贺卡。我们被允许使用图片作为卡片（将它们设置为输出的背景）。表单应该让用户输入一些自定义信息，如收件人的名字，颜色信息等。它还可以让他们添加一些着名卡通人物的贴纸。应该有一个按钮，当它们点击它时，隐藏表单（通过更改相应元素的CSS可见性或显示属性）并显示一张卡，其中包含他们输入的文本和其他配置详细信息。
我现在所困扰的是如何根据他们选择的贺卡和字符设置背景图片（使用“if else statements”或switch case）。另外，我需要在背景图片的某个位置设置文字和贴纸。
非常感谢您提供的时间和帮助。
提前谢谢。
以下是我的Java脚本，CSS和HTML代码：
< script >
function selectAll() {
for (var i = 0; i < document.forms[0]['charac'].length - 1; i++)
document.forms[0]['charac'][i].checked = document.forms[0]['charac'][5].checked;
}
document.forms[0]['charac'][5].addEventListener('click', selectAll);
// function showOutput() {
// var a = document.getElementById("txtName").value;
// var b = document.getElementById("txtName1").value;
// var c = document.getElementById("content-field").value;
// document.writeln(a + "<br><br> " + b + "<br><br> " + c);
// document.getElementById("formOutput").innerHTML = "This is how your card looks" + a + " " + b + " " + c;
// document.getElementById("formCard").style.backgroundImage="url('birthday-card.jpg')";
// }
function myCard() {
var a = document.getElementById("txtName").value;
var b = document.getElementById("txtName1").value;
var c = document.getElementById("content-field").value;
// document.getElementById("formOutput").style.backgroundImage="url('birthday-card.jpg')";
var selected;
if (document.forms[0][9].checked == true) {
document.body.style.backgroundImage = url('birthday-card.jpg');
document.getElementById("formOutput").innerHTML = a + "<br><br> " + b + "<br><br> " + c;
} else
if (document.forms[0][10].checked == true) {
document.body.style.backgroundImage = url('valentine-card.jpg');
document.getElementById("formOutput").innerHTML = a + "<br><br> " + b + "<br><br> " + c;
} else
if (document.forms[0][11].checked == true) {
document.body.style.backgroundImage = url('valentine-card.jpg');
document.getElementById("formOutput").innerHTML = a + "<br><br> " + b + "<br><br> " + c;
} else
if (document.forms[0][12].checked == true) {
document.body.style.backgroundImage = "url('valentine-card.jpg')";
// document.getElementById("formOutput").innerHTML ="name";
} else
if (selected == document.forms[0][13]) {
document.body.style.backgroundImage = "url('valentine-card.jpg')";
// document.getElementById("formOutput").innerHTML ="name";
} else
if (selected == document.forms[0][14]) {
document.body.style.backgroundImage = "url('valentine-card.jpg')";
// document.getElementById("formOutput").innerHTML ="name";
} else
if (selected == document.forms[0][15]) {
document.body.style.backgroundImage = "url('valentine-card.jpg')";
// document.getElementById("formOutput").innerHTML ="name";
}
}
// document.forms[0][24].addEventListener('click', showOutput);
< /script><style> #formOutput {
background-image: url("blank-card1.jpg");
background-size: cover;
background-repeat: no-repeat;
text-align: center;
}
table {
text-align: center;
margin-left: auto;
margin-right: auto;
}
table td {
height: 15px;
text-align: left;
}
</style><!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Generate a Greeting Card</title>
</head>
<body>
<div id='formOutput'>
<h3>Fill out the following information and select a card to view how it looks.</h3>
<form id="formCard" action="">
<fieldset>
<legend>Personal information:</legend>
<table>
<tr>
<td>
<label for="txtName">Your Name<span style="color:red">*</span>
</label>
</td>
<td>
<input type="text" id="txtName" name="name" value="name" required/>
</td>
</tr>
<tr>
<td>
<label for="txtName1">Your Family Member's
<br>OR Friend's Name<span style="color:red">*</span>
</label>
</td>
<td>
<input type="text" id="txtName1" name="name1" value="Family/Friend Name" required/>
</td>
</tr>
<tr>
<td>
<label for="txtAddress">Address</label>
</td>
<td>
<input type="text" id="txtAddress" name="address" value=" ">
</td>
</tr>
<tr>
<td>
<label for="postalCode">Postal Code<span style="color:red">*</span>
</label>
</td>
<td>
<input type="text" id="postalCode" name="postalcode" value=" " required/>
</td>
</tr>
<tr>
<td>Province<span style="color:red">*</span>
</td>
<td>
<select id="selProvince" name="province" required>
<option value="" selected>Please select...</option>
<option value="AB">Alberta</option>
<option value="BC">British Columbia</option>
<option value="MB">Manitoba</option>
<option value="NB">New Brunswick</option>
<option value="NFL">Newfoundland and Labrador</option>
<option value="NW">Northwest Territories</option>
<option value="NS">Nova Scotia</option>
<option value="NU">Nunavut</option>
<option value="ON">Ontario</option>
<option value="PEI">Prince Edward Island</option>
<option value="QC">Quebec</option>
<option value="SK">Saskatchewan</option>
<option value="YK">Yukon</option>
</select>
</td>
</tr>
<tr>
<td>
<label for="txtPhone">Phone<span style="color:red">*</span>
</label>
</td>
<td>
<input type="text" id="txtPhone" name="phone" value=" " required/>
</td>
</tr>
<tr>
<td>
<label for="txtEmail">Email<span style="color:red">*</span>
</label>
</td>
<td>
<input type="text" id="txtEmail" name="email" required/>
</td>
</tr>
<tr>
<td>Would you like to send it
<br>via email or mail<span style="color:red" required>*</span>
</td>
<td>
<label>
<input type="radio" name="route" value="m" />Mail</label>
<label>
<input type="radio" name="route" value="e" />Email</label>
</td>
</tr>
<tr>
<td>Type of Greeting Card:<span style="color:red">*</span>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
</td>
<td>
<br>
<label>
<input type="radio" name="card" id="birthday" value="bd" />Birthday</label>
<br>
<label>
<input type="radio" name="card" id="valentine" value="vd" />Valentines Day</label>
<br>
<label>
<input type="radio" name="card" id="friendship" value="frd" />Friendship Day</label>
<br>
<label>
<input type="radio" name="card" id="mother" value="md" />Mother's Day</label>
<br>
<label>
<input type="radio" name="card" id="father" value="fad" />Father's Day</label>
<br>
<label>
<input type="radio" name="card" id="newYear" value="nyd" />New Year's Day</label>
<br>
<label>
<input type="radio" name="card" id="christmas" value="cd" />Christmas Day</label>
<br>
<br>
</td>
</tr>
<tr>
<td>Choose the person's
<br>Favourite cartoon charcters:<span style="color:red">*</span>
<br>
<br>
<br>
<br>
<br>
</td>
<td>
<label>
<input type="checkbox" name="charac" value="mickeyMouse" checked/>Mickey Mouse & Clubhouse</label>
<br>
<label>
<input type="checkbox" name="charac" value="scoobyDoo" />Scooby Doo</label>
<br>
<label>
<input type="checkbox" name="charac" value="tomJerry" />Tom & Jerry</label>
<br>
<label>
<input type="checkbox" name="charac" value="tweetiePie" />Tweetie Pie</label>
<br>
<label>
<input type="checkbox" name="charac" value="donaldDuck" />Donald Duck</label>
<br>
<label>
<input type="checkbox" name="charac" value="selectAll" />Select All</label>
</td>
</tr>
<tr>
<td>Choose a colour for the
<br>text on the card:</td>
<!--color code from w3schools.org-->
<td>
<input type="color" id="html5colorpicker" onchange="clickColor(0, -1, -1, 5)" value="#ff0000" style="width:85%;">
</td>
</tr>
<tr>
<td>
<label>Content</label>
</td>
<td>
<textarea id="content-field" cols="20" rows="2" value="" placeholder="Write them a personal message..."></textarea>
</td>
</tr>
<tr>
<td>Choose an image to put on
<br>the card to make it special.</td>
<td>
<label>
<input type="file" name="pic" accept="image/*">
</label>
</td>
</tr>
<tr>
<td> </td>
<td>
<br>
<br>
<input type="button" onclick="myCard(); return false" value="SEND" />
<input type="reset" value="CLEAR" />
</td>
<td> </td>
</tr>
</table>
</fieldset>
</form>
</div>
</body>
</html>
答案 0 :(得分：0)
好的，首先关闭：不要对目标元素进行索引编号。如果另一个表单被添加到页面，或者某些输入添加到表单，则意味着麻烦，必须重做所有数字。使用ID，类名等，这也使事情更易读，更容易调试。同样的vars：i，x非常适合小循环，但有意义的var名称更容易调试。好吧，老师模式hahaa结束了。我知道我应该在我的香草js上工作：）
TIP！我没有使用它，但您可以使用querySelector轻松地使用css路径定位js中的元素！
无论如何，我改变了你脚本中的一些东西，使用了一个数组代替一个开关，并创建了一个获取BG图像的循环。只需调整img名称和路径（取消注释第35行）。不知道你想要的文字（和贴纸???）所以我所做的只是清理并修复了一些错误。看看：
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