【问题标题】:How to change img src from $.getJSON?如何从 $.getJSON 更改 img src?
【发布时间】:2017-06-12 16:35:43
【问题描述】:

我想使用 JS 和 JSON 更改 img src 的内容(在 HTML 代码上),但我无法获得。

有两个$.getJSON 调用是由于我不知道在同一个调用中获取一个数组和一个对象,对不起这个糟糕的代码但我想记住你这不是问题(这段代码很粗糙,但它可以工作)

问题:

当点击fa fa-search-plus fa-3x图标调用$('.imagen-go').click(function()时,在对话框页面上替换(应该)imagen-to-show(使用JQM 1.4.5 sintax),这样它将显示来自JSON的图像。

我认为:由于$.getJSON 是异步的,在获得files = files['files']; JS 之前运行其余代码(比$.getJSON 更快)当它到达变量subLoc8 时仍然为空。请同时阅读我关于内联代码的注释,以便更好地理解。

我该如何解决?

JS代码:

$( document ).on( "pageinit", "#page-1", function( event ) {

var parser_origin = 'http://xxxxxx.com';
var path_thumb1 = '/upload_menus/thumb1/' + id_establecimiento() +'/';
var img_tmpl = '/upload_tmpl/upload.jpg';


   //get data[] (array). 1er JSON. start
    $.getJSON( parser_origin + "/_country/spain/v137/lacarte.restaurants.back/alacarte/php/r.shw.menu.php", { site: id_establecimiento(),idioma: to_translate(),traduccion: traduc_usada() }, function(data){

          for (var i=0, len=data.length; i < len; i++) {
              console.log(data[i]);
          }
              data = data['data']; 

    //get files{} (object) . 2nd JSON. start
    $.getJSON( parser_origin + "/_country/spain/v137/lacarte.restaurants.back/alacarte/php/r.shw.menu.php", { site: id_establecimiento(),idioma: to_translate(),traduccion: traduc_usada() }, function(files){ //files // ori

            for (var z=0, len=files.length; z < len; z++) {
              console.log(files[z]); //required!!
                }
            files = files['files']; 

// Now two nested $.each(), to iterate on 1st JSON and get objects of 2nd JSON. It`s work fine!

// 1st loop. sections 
$.each(data, function (i, v) {
collapsible.push(v.es_un); 

$.each(collapsible, function (i, v) {
    if ($.inArray(v, seccion) === -1) {
        seccion.push(v);
    }
    });
});

// 2nd loop. items into sections 
$.each(seccion, function (i, loc) {
var parent = loc;
var elements = '';

$.each(data, function (x, sub) {
    var subLoc = sub.nombre;
    var subLoc2 = sub.condimentos;
    var subLoc5 = sub.DT_RowId; 
    var subLoc6 = sub.alergeno; 
    var subLoc7 = sub.nota_item; 
    var subLoc8 = sub.image; 
    // check if have a picture  
      if  (subLoc8 == null || subLoc8 == '')   {
          var foto_mostrar_listview = img_tmpl;  // if not, assign a dummy image for not empty  
        }
      else if  (subLoc8 != null){// if, yes, get it 
          var foto_mostrar_listview = files.files_menus[subLoc8].web_path_thumb2;
        };

    var foto_f = '<img src="'+ foto_mostrar_listview +'" alt="img25"/>';        


    if (sub.es_un == parent) {

                elements += '<li class="ui-li-has-thumb ui-first-child">'+ foto_f +'<h2>'+ subLoc + '</h2><h3>' + subLoc2 + '<h3><p>' + '</p><h6><h6><h1 class="ui-li-aside" style="right:0.80em">' + '<i class="fa fa-hashtag" aria-hidden="true"></i>'+ '<span class="notranslate">' + items + '<span></h1>' + '</li><a href="#popupPhotoPortrait" data-position-to="window" data-transition="fade" class="imagen-go" id="' + subLoc8 + '"><span class="fontawesome"><i class="fa fa-search-plus fa-3x" aria-hidden="true"></i></span></a></p>' 
                items++;  

    } //end if (sub.es_un)

});//$.each(data...)

$("#location-list").append($("<div/>").append($("<div/>", {
    "data-role": "collapsible", 
    "data-collapsed": "true", 
        "data-collapsed-icon": "carat-r", 
        "data-expanded-icon": "carat-d", 
        "class": parent,
        "style" : "margin : 8px 4px"  
}).append($("<h3/>").text(parent)).append($("<ul/>", { 
         "data-role": "listview", 
        "data-theme": "e",
        "data-count-theme": "b",
 }).append(elements).listview()))).collapsibleset('refresh');  

}); //$.each(seccion,...)


    }); //fin del getJSON files{}
    });  //fin del getJSON data[]

});// end ( document ).on

$('.imagen-go').click(function() {

        var id= $(this).attr("id"); 
        var extension =  ".jpg";
        document.getElementById('imagen-to-show').src = path_thumb1 + id + extension ;  // ori

}); // end ('.imagen-go')

HTML:关注问题(对话页面):

...
<!-- DIALOG page. Show picture. start -->

          <div data-role="dialog" id="popupPhotoPortrait" class="photopopup" data-overlay-theme="a"  data-corners="false" data-tolerance="30,15">
          <a href="#" data-rel="back" 
          class="ui-btn ui-corner-all ui-shadow ui-btn-a ui-icon-delete ui-btn-icon-notext ui-btn-left">Close</a>
          <img src="" alt="Foto del item" id="imagen-to-show" style="width: 100%">
          </div><!-- /Dialog --> 
...

JSON 输出:关注与上述代码相关的变量。来自 1er JSON 和 2nd JSON

"web_path_thumb2":"\/upload_menus\/thumb2\/342800010\/748.jpg", //2nd JSON

"image":"757"  // 1st JSON

【问题讨论】:

    标签: image getjson src


    【解决方案1】:

    我找到了解决方案:放入 $.getJSON 调用中,该函数检测点击显示图像的按钮(从 JSON 中获取“id”值)。

    这里是最终有效的代码!!:

    问候

    $( document ).on( "pageinit", "#page-1", function( event ) {
    
    var parser_origin = 'http://xxxxxx.com';
    var path_thumb1 = '/upload_menus/thumb1/' + id_establecimiento() +'/';
    var img_tmpl = '/upload_tmpl/upload.jpg';
    
    
       //get data[] (array). 1er JSON. start
        $.getJSON( parser_origin + "/_country/spain/v137/lacarte.restaurants.back/alacarte/php/r.shw.menu.php", { site: id_establecimiento(),idioma: to_translate(),traduccion: traduc_usada() }, function(data){
    
              for (var i=0, len=data.length; i < len; i++) {
                  console.log(data[i]);
              }
                  data = data['data']; 
    
        //get files{} (object) . 2nd JSON. start
        $.getJSON( parser_origin + "/_country/spain/v137/lacarte.restaurants.back/alacarte/php/r.shw.menu.php", { site: id_establecimiento(),idioma: to_translate(),traduccion: traduc_usada() }, function(files){ //files // ori
    
                for (var z=0, len=files.length; z < len; z++) {
                  console.log(files[z]); //required!!
                    }
                files = files['files']; 
    
    // Now two nested $.each(), to iterate on 1st JSON and get objects of 2nd JSON. It`s work fine!
    
    // 1st loop. sections 
    $.each(data, function (i, v) {
    collapsible.push(v.es_un); 
    
    $.each(collapsible, function (i, v) {
        if ($.inArray(v, seccion) === -1) {
            seccion.push(v);
        }
        });
    });
    
    // 2nd loop. items into sections 
    $.each(seccion, function (i, loc) {
    var parent = loc;
    var elements = '';
    
    $.each(data, function (x, sub) {
        var subLoc = sub.nombre;
        var subLoc2 = sub.condimentos;
        var subLoc5 = sub.DT_RowId; 
        var subLoc6 = sub.alergeno; 
        var subLoc7 = sub.nota_item; 
        var subLoc8 = sub.image; 
        // check if have a picture  
          if  (subLoc8 == null || subLoc8 == '')   {
              var foto_mostrar_listview = img_tmpl;  // if not, assign a dummy image for not empty  
            }
          else if  (subLoc8 != null){// if, yes, get it 
              var foto_mostrar_listview = files.files_menus[subLoc8].web_path_thumb2;
            };
    
        var foto_f = '<img src="'+ foto_mostrar_listview +'" alt="img25"/>';        
    
    
        if (sub.es_un == parent) {
    
                    elements += '<li class="ui-li-has-thumb ui-first-child">'+ foto_f +'<h2>'+ subLoc + '</h2><h3>' + subLoc2 + '<h3><p>' + '</p><h6><h6><h1 class="ui-li-aside" style="right:0.80em">' + '<i class="fa fa-hashtag" aria-hidden="true"></i>'+ '<span class="notranslate">' + items + '<span></h1>' + '</li><a href="#popupPhotoPortrait" data-position-to="window" data-transition="fade" class="imagen-go" id="' + subLoc8 + '"><span class="fontawesome"><i class="fa fa-search-plus fa-3x" aria-hidden="true"></i></span></a></p>' 
                    items++;  
    
        } //end if (sub.es_un)
    
    });//$.each(data...)
    
    $("#location-list").append($("<div/>").append($("<div/>", {
        "data-role": "collapsible", 
        "data-collapsed": "true", 
            "data-collapsed-icon": "carat-r", 
            "data-expanded-icon": "carat-d", 
            "class": parent,
            "style" : "margin : 8px 4px"  
    }).append($("<h3/>").text(parent)).append($("<ul/>", { 
             "data-role": "listview", 
            "data-theme": "e",
            "data-count-theme": "b",
     }).append(elements).listview()))).collapsibleset('refresh');  
    
    }); //$.each(seccion,...)
    
    // funtion that detect click on button (take "id" value from JSON)
    $('.imagen-go').click(function() {
    
            var id= $(this).attr("id"); 
            var extension =  ".jpg";
            document.getElementById('imagen-to-show').src = path_thumb1 + id + extension ;  // ori
    
    }); // end ('.imagen-go')
    
        }); //fin del getJSON files{}
        });  //fin del getJSON data[]
    
    });// end ( document ).on
    

    【讨论】:

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