dojo.formToJson¶
| since: | V0.9 |
|---|
Contents
Helper function for converting a HTML form to a JSON string
Introduction¶
This function is one of many helpers used by the dojo Xhr subsystem for handling AJAX style requests. This particular function takes a HTML form node and converts the form elements into a JSON string. This function is identical to doing the operation:
dojo.toJson(dojo.formToObject(“formid”));
You can refer to the dojo.formToObject documentation for more details.
Since Dojo 1.7, dojo.formToJson is exposed via the toJson method of the dojo/dom-form module. An alias is kept in dojo/_base/xhr for backward-compatibility.
Usage¶
Usage is simple and straightforward, you pass the form node or the string id of a form node to convert. The function will hand back a JSON string of the name/value pairs from the form elements.
Dojo 1.7+ (AMD)¶
require(["dojo/dom-form"], function(domForm){
var formId = "myId";
var formJson = domForm.toJson(formId);
// Assuming a form of:
// <form id="myform">
// <input type="text" name="field1" value="value1">
// <input type="text" name="field2" value="value2">
// <input type="button" name="someButton" value="someValue">
// </form>
//
// The structure of formJson will be:
// {"field1":"value1", "field2":"value2"}
// Note the button was skipped.
});
Dojo < 1.7¶
var formId = "myId";
var formJson = dojo.formToJson(formId);
// Assuming a form of:
// <form id="myform">
// <input type="text" name="field1" value="value1">
// <input type="text" name="field2" value="value2">
// <input type="button" name="someButton" value="someValue">
// </form>
//
// The structure of formJson will be:
// {"field1":"value1", "field2":"value2"}
// Note the button was skipped.
Examples¶
Example 1: Using formToJson to create an JSON version of a form¶
function convertForm(){
dojo.connect(dijit.byId("convertForm"), "onClick", function(){
var formJson = dojo.formToJson("myform");
// Attach it into the dom as pretty-printed text.
dojo.byId("formObject").innerHTML = formJson;
});
}
dojo.ready(convertForm);
<button id="convertForm" data-dojo-type="dijit.form.Button">Click to convert the form to an object</button><br><br>
<b>The FORM</b><br><br>
<form id="myform">
<input type="text" name="field1" value="value1">
<input type="text" name="field2" value="value2">
<input type="button" name="someButton" value="someValue">
</form>
<br><br>
<b>The form as JSON:</b>
<pre id="formObject"></pre>
Example 2: Using formToJson to create a JSON version of a form with dijit widgets¶
dojo.require("dijit.form.TextBox");
dojo.require("dijit.form.Button");
function convertFormDigits(){
dojo.connect(dijit.byId("convertFormDigits"), "onClick", function(){
var formJson= dojo.formToJson("myform2");
// Attach it into the dom as pretty-printed text.
dojo.byId("formObject2").innerHTML = formJson;
});
}
dojo.ready(convertFormDigits);
<button id="convertFormDigits" data-dojo-type="dijit.form.Button">Click to convert the form to an object</button><br><br>
<b>The FORM</b><br><br>
<form id="myform2">
<input type="text" data-dojo-type="dijit.form.TextBox" name="field1" value="value1">
<input type="text" data-dojo-type="dijit.form.TextBox" name="field2" value="value2">
<button data-dojo-type="dijit.form.Button" name="someButton" value="someValue">someValue</button>
</form>
<br><br>
<b>The form as JSON:</b>
<pre id="formObject2"></pre>