Jquery changes the Boolean state of disabled in three ways

2020-03-30 00:51:58
OfStack

The first is to change the Boolean state of disabled. The specific code and explanation are as follows:

The code is as follows:

 
$("button:eq(2)").click(function(){ 
var text2=$("input:text:eq(2)"); 
if(text2.attr("disabled")==false){ 
//Set the disabled property of the third text input box to true by setting the Boolean property of disabled
text2.attr("disabled",true); 
}else{ 
//The disabled property is removed by setting the third text input field, the disabled property, to false
text2.attr("disabled",false); 
} 
});

The second: remove the disabled property. The specific code and explanation are as follows:

The code is as follows:

 
$("button:eq(1)").click(function(){ 
var text2=$("input:text:eq(1)"); 
if(text2.attr("disabled")==false){ 
//Set the value of disabled to disabled for the second text input box
text2.attr("disabled","disabled"); 
}else{ 
//Remove the disable property from the second text field by removing it
text2.removeAttr("disabled"); 
} 
});

The third is to change the value of disabled. The specific code and explanation are as follows:

The code is as follows:

 
$("button:eq(0)").click(function(){ 
var text1=$("input:text:eq(0)"); 
if(text1.attr("disabled")==""){ 
//Or text1. Attr (" disabled ") = = false
//Set the value of disabled to disabled for the first text input box
text1.attr("disabled","disabled"); 
}else{ 
//Clear the disabled property from the first text field by overriding it
text1.attr("disabled",""); 
} 
});

The complete sample code is as follows (the test passed) :
The code is as follows:

 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> <script src="jquery I'm just going to introduce the path "></script> 
<script type="text/javascript"><!-- 
$(document).ready(function () { 
$("button:eq(0)").click(function () { 
var text1 = $("input:text:eq(0)"); 
if (text1.attr("disabled") == "") { 
//Or text1. Attr (" disabled ") = = false
//Set the value of disabled to disabled for the first text input box
text1.attr("disabled", "disabled"); 
} else { 
//Clear the disabled property from the first text field by overriding it
text1.attr("disabled", ""); 
} 
}); 
$("button:eq(1)").click(function () { 
var text2 = $("input:text:eq(1)"); 
if (text2.attr("disabled") == false) { 
//Set the value of disabled to disabled for the second text input box
text2.attr("disabled", "disabled"); 
} else { 
//Remove the disable property from the second text field by removing it
text2.removeAttr("disabled"); 
} 
}); 
$("button:eq(2)").click(function () { 
var text2 = $("input:text:eq(2)"); 
if (text2.attr("disabled") == false) { 
//Set the disabled property of the third text input box to true by setting the Boolean property of disabled
text2.attr("disabled", true); 
} else { 
//The disabled property is removed by setting the third text input field, the disabled property, to false
text2.attr("disabled", false); 
} 
}); 
}); 
// --></script> 
</head> 
<body> 
<button>disabledNull</button> 
<input type="text" value="input something into me!" size="40"/> 
<br/> 
<button>disabledRemove</button> 
<input type="text" value="input something into me!" size="40"/> 
<br/> 
<button>disabledState</button> 
<input type="text" value="input something into me!" size="40"/> 
</body> 
</html>