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js动态的在页面上增加或删除一个文本框

2015-08-31 20:35 721 查看

转自http://www.5xsj.net/program/8/22/297.html

<html>
<head>
<title>js动态的在页面上增加或删除一个文本框</title>
<script type="text/javascript">
<!--
var textNumber = 1;
function addTextBox(form, afterElement) {
// Increment the textbox number
textNumber++;
// Create the label
var label = document.createElement("label");
// Create the textbox
var textField = document.createElement("input");
textField.setAttribute("type","text");
textField.setAttribute("name","txt"+textNumber);
textField.setAttribute("id","txt"+textNumber);
// Add the label's text
label.appendChild(document.createTextNode("Text Box #"+textNumber+": "));
// Put the textbox inside
label.appendChild(textField);
// Add it all to the form
form.insertBefore(label,afterElement);
return false;
}
function removeTextBox(form) {
if (textNumber > 1) { // If there's more than one text box
// Remove the last one added
form.removeChild(document.getElementById("txt"+textNumber).parentNode);
textNumber--;
}
}
//-->
</script>
<style type="text/css">
<!--
label {display:block;}
-->
</style>
</head>
<body>
<form id="myForm" method="get" action="./" />
<label>Text Box #1: <input type="text" name="txt1" id="txt1" /></label>
<p>
<input type="button" value="Add Textbox" onClick="addTextBox(this.form,this.parentNode)" />
<input type="button" value="Remove Textbox" onClick="removeTextBox(this.form)" />
</p>
<p><input type="Submit" value="Submit" /></p>
</form>
</body>
</html>

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