Constructing AJAX method to implement form JSON conversion-JS Tutorial-php.cn

Constructing AJAX method to implement form JSON conversion

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Release： 2018-04-04 15:59:39

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This time I will bring you the method of constructing AJAX to implement form JSON conversion, and what are the precautions for constructing AJAX to implement form JSON conversion. The following is a practical case, let's take a look.

ajax submits server data and sorts out the conversion method.

HTML：

<form id="fm" name="fm" action="">
<input name="UserName" type="text" value="UserName1"/>
</form>
<input name="UserId" id="UserId" type="text" value="UserId1"/>

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1. Convert form elements to QueryString

var q = $('#fm,#UserId').serialize(); //q = UserName=UserName1&UserId=UserId1

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2.String, JSON conversion

var obj = jQuery.parseJSON('{"name":"John"}');
alert( obj.name === "John" );

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You can use the jquery-json plug-in to achieve conversion, directly quote the example

var thing = {plugin: 'jquery-json', version: 2.3};
var encoded = $.toJSON( thing );
// '{"plugin":"jquery-json","version":2.3}'
var name = $.evalJSON( encoded ).plugin;
// "jquery-json"
var version = $.evalJSON(encoded).version;
// 2.3

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3. Form, element to Name, Value array

var arr = $("#fm,#UserId").serializeArray();
/*[ 
{name: 'UserName', value: '"UserName"1'}, 
{name: 'UserId', value: 'UserId'}
] */

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4. Form element to JSON

$.fn.serializeObject = function()
{
var o = {};
var a = this.serializeArray();
$.each(a, function() {
if (o[this.name] !== undefined) {
if (!o[this.name].push) {
o[this.name] = [o[this.name]];
}
o[this.name].push(this.value || '');
} else {
o[this.name] = this.value || '';
}
});
return o;
};
var obj = $('form').serializeObject();
/*obj: Object
UserId: "UserId1"
UserName: "UserName1"
proto: Object*/

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5. JSON2FORM

$.getJSON('url_to_file', function(data) {
for (var i in data) {
$('input[name="'+i+'"]').val(data[i]);
}
}

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Google found a more powerful plug-in http://code.google.com/p /jquery-load-json/

data = {
"Name":"Emkay Entertainments",
"Address":"Nobel House, Regent Centre",
"Contact":"Phone"
} 
$('p#data').loadJSON(data);
<p id="data">
<h1 id="Name">Emkay Entertainments</h1>
<label for="Address">Address:</label>
<span id="Address">Nobel House, Regent Centre</span> 
<label for="Contact">Contact by:</label>
<span id="Contact">Phone</span>
</p>

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!