Controlinput box read-only can prevent users from changing data, which is quite practical in some cases. Let’s use js to complete this read-only implementation
<html>
<head>
<title> New Document </title>
<meta name="Generator" content="EditPlus">
<meta name="Author"
content="">
<meta name="Keywords" content="">
<meta
name="Description" content="">
</head>
<script
language="JavaScript">
function isreadonly(){
var obj =
document.getElementById("username");
obj.setAttribute("readOnly",true);
obj.style.backgroundColor="#d2d2d2";
}
function readwrite(){
var
obj = document.getElementById("username");
obj.setAttribute("readOnly",false);
obj.style.backgroundColor="#ffffff";
}
</script>
<body>
<form name="addform"
id="addform" method="post" action="" >
<input type="text"
id="username" name="username">
<input type="button" name="只读"
value="read" onclick="isreadonly();">
<input type="button" name="可写"
value="write" onclick="readwrite();">
</form>
</body>
</html>
<!--
点击“read”按钮，input框不能书写，且变灰；点击“write”按钮，input框恢复。
-->The above are the details of js setting input text box read-only , please pay attention to other related articles on the php Chinese website for more information!
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Set all form objects as read-only through js
How to process the form to make input and other text boxes read-only and non-editable
Use js to dynamically control the read-only attribute of the input box
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