如何基于原始JavaScript中的输入名称创建表单输入值的嵌套对象(JSON)? [英] How to create a nested object (JSON) of a form input values based on the input name in vanilla JavaScript?

问题描述

//让表单如下所示

 <form id="myform">
      <input name="foo" value="parent"/>
      <input name="foo.cat.bar" value="child1"/>
      <input name="foo.cat.biz" value="child2"/>
      <input name="foo.cat.biz.dog.bar" value="child3"/>
  </form>

///我希望基于输入名称attr//的JSON格式输出像这样//(这只是一个示例，需要通用答案和最佳方法)

// I want the output to be like this in JSON format based on the input name attr //(this is just an example, want generic answer and the best way to do it)

{
    "foo": "parent",
    "foo.cat": {
        "bar": "child1",
        "biz": "child2",
        "foo.cat.biz.dog": {
            "bar": "child3"
        }
    }
}

推荐答案

在这里.我在评论中加入了解释...

Here you go. I've included an explanation in the comments...

function getFormData() {
    /* return nested array combined
       into groups of two. See question @ 
       https://stackoverflow.com/a/31352555/4746328 */
    function groupIntoPairs(arr) {
        var temp = arr.slice();
        var out = [];

        while (temp.length) {
            out.push(temp.splice(0,2));
        }

        return out;
    }

    /* create a storage object */
    var data = {},
    /* get 'input' elements as an array */
    inputs = [].slice.call(document.getElementById('myform').querySelectorAll('input')),
    /* additional variables */
    name, hold, splits, L, dKey;

    /* loop through input elements */
    inputs.forEach(function(n) {
        name = n.name;

        /* for holding key strings */
        hold = '';

        /* split the 'name' at '.'
           and group into pairs */ 
        splits = groupIntoPairs( name.split('.') );

        /* index of last item in 'splits' */
        L = splits.length - 1;

        /* if 'splits' has only one
           item add the name-value pair
           to 'data' straight away */
        if (L === 0) {
            data[name] = n.value;
        } else {
            /* loop 'splits' to create keys */
            splits.forEach(function(x, i) {
                /* combine key strings until
                   last item in 'splits' */
                if (i !== L) hold += '.' + x.join('.');
            });

            /* define the key */
            dKey = hold.slice(1);

            /* create 'data[dKey]' Object if
               it doesn't exist or use it
               again if it does */
            data[dKey] = data[dKey] || {};

            /* add last item in 'splits' as 
               key for 'data[dKey]' and 
               assign current n.value */
            data[dKey][splits[L][0]] = n.value;                
        }
    });
    /* return 'data' object */
    return data;
}

console.log('data:', JSON.stringify(getFormData(), null, 4));
/* => data: {
    "foo": "parent",
    "foo.cat": {
        "bar": "child1",
        "biz": "child2"
    },
    "foo.cat.biz.dog": {
        "bar": "child3"
    }
}
*/

希望有帮助.

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