我有一个按钮,允许您添加字段到表单中。
<form id="contact" name="contactForm" action="newPoll.php" method="post">
<fieldset>
<legend>Create A Poll</legend><br style="clear:both;">
<ol>
<li><lable for=pollTitle>Poll Title:</lable><input name="pollTitle" id="pollTitle" type="text" size="66" /> </li>
<li><lable for=question>1st Question:</lable><input name="question" id="question" type="text" size="66" /> </li>
<li><lable for=answerType>Constrained:</lable><input name="answerType" id="answerType" value="Constrained" type="radio" size="66" /><span style="margin: 0 0 0 40px;">
Unconstrained: <input style="margin-right: 30px;" name="answerType" value="Unconstrained" id="question" type="radio" size="66" /></span>(Allow multiple answers) </li>
<li><lable for=answer1>Answer:</lable><input name="answer1" id="answer1" type="text" size="66" /> </li>
<li><lable for=answer2>Answer:</lable><input name="answer2" id="answer2" type="text" size="66" /> </li>
<li><lable for=answer3>Answer:</lable><input name="answer3" id="answer3" type="text" size="66" /> </li>
<li><lable for=answer4>Answer:</lable><input name="answer4" id="answer4" type="text" size="66" /> </li>
</ol><br />
</fieldset>
<input type="button" value="Add More Answers" name="addAnswer" onClick="generateRow()" /><input type="submit" name="submit" value="Add Another Question">
</form>
这里是generateRow():
var count = 5;
function generateRow() {
var d=document.getElementById("contact");
var b = document.getElementById("answer4");
var c =b.name.charAt(0);
var f = b.name.substr(0, 6);
var y = f + count;
count = count + 1;
d.innerHTML+='<li><lable for=' + y + '>Answer:</lable><input name="' + y + '" id="' + y + '" type="text" size="66"/> </li>';
}
问题是,每当添加新行时,它将删除可能在任何非原始(添加)文本字段中键入的任何输入。它应该将数据保留在表单元素中
最佳答案
当您设置innerHTML
属性时,浏览器将解析HTML并为其创建新的DOM树,然后用新的DOM树替换当前的DOM树。这会破坏任何不在HTML中的数据。
您需要使用createElement
和appendChild
或使用jQuery附加DOM元素(更简单)。