Javascript canvas loadFromJson不应用字体系列
我正在使用以下代码呈现google字体并更新画布:Javascript canvas loadFromJson不应用字体系列,javascript,jquery,canvas,fabricjs,Javascript,Jquery,Canvas,Fabricjs,我正在使用以下代码呈现google字体并更新画布: /* on change of font load the preview as well as canvas */ $('#font').on('change', function () { $('.font_preview').show(); var font_family = $(this).val(); $('.font_preview').css('font-famil
/* on change of font load the preview as well as canvas */
$('#font').on('change', function () {
$('.font_preview').show();
var font_family = $(this).val();
$('.font_preview').css('font-family', font_family, 14);
$('.font_preview').html(font_family,'');
load_web_font([font_family],'.font_preview',font_family,1);
});
function load_web_font(font_family, preview_div,font_family_text,preview_text) {
var grep_font = jQuery.grep(font_family, function (n, i) {
return ( n );
});
if (grep_font.length > 0) {
var preview_text;
if (preview_div) {
preview_text = $(preview_div).text();
}
WebFont.load({
google: {
families: font_family
},
fontloading: function (familyName, fvd) {
if (preview_div) {
if(preview_text==1)
{
$(preview_div).text('font loading ... ');
}
}
},
fontactive: function (familyName, fvd) {
if (preview_div) {
if(preview_text==1)
{
$(preview_div).text(preview_text);
}
load_font_on_canvas(font_family_text);
}
},
timeout: 10000
});
}
}
//Load Font on Canvas
function load_font_on_canvas(font_style)
{
var font_style = font_style;
if(font_style=='')
{
alert('Please select a Font Style');
return false;
}
var tObj = canvas.getActiveObject();
//Check that text is selected
if(tObj==undefined)
{
alert('Please select a Text');
return false;
}
tObj.set({
fontFamily: font_style
});
canvas.renderAll();
}
现在,我将画布数据存储为数据库中的json。因此,在此之后,当任何用户尝试编辑画布时,我将使用以下代码渲染画布:
if(is_update==1) // Update then load the card
{
// parse the data into the canvas
canvas1.loadFromJSON(front_side_object);
// re-render the canvas
canvas1.renderAll();
canvas2.loadFromJSON(back_side_object);
canvas2.renderAll();
}
所以画布正在加载,但不是用户选择的字体。所以我试着用下面的代码用谷歌字体更新画布,但它不起作用
//Grab each google fonts
var all_fonts = [];
$('#font option').each(function(){
var font_family = $(this).val();
//all_fonts += font_family + '|';
if(font_family!='')
{
all_fonts.push(font_family);
}
});
load_all_web_font(all_fonts);
function load_all_web_font(all_fonts)
{
var grep_font = jQuery.grep(all_fonts, function (n, i) {
return ( n );
});
WebFont.load({
google: {
families: all_fonts
},
fontloading: function (familyName, fvd) {
//Do Something
},
fontactive: function (familyName, fvd) {
//1st Try rerender canvas again after fonts is loaded
//Do SOmething
canvas1.loadFromJSON(front_side_object);
// re-render the canvas
canvas1.renderAll();
canvas2.loadFromJSON($model->back_side_object);
canvas2.renderAll();
//Get the text and rerender the canvas
canvas1.getObjects().filter(function(o) {
if (o.get('type') === 'text') {
console.log(o.get);
canvas1.renderAll();
}
});
canvas2.getObjects().filter(function(o) {
if (o.get('type') === 'text') {
canvas2.renderAll();
}
});
},
timeout: 10000
});
}
在加载FromJSON之前,您必须检查google字体是否已下载。加载完google字体后,您可以再次调用Renderal。@artgb我已经在fontactive:function(familyName,fvd)中完成了此操作{事件。加载字体后,我将调用Renderal。请将JSFIDLE设置为当前状态。这里有一个自定义字体加载演示:它使用FontFaceObserver。在加载FromJSON之前,您必须检查google字体是否已下载。加载完google字体后,您可以再次调用Renderal。@artgb我已在fontactive:functi中完成此操作在(familyName,fvd){event上。加载字体后,我将调用Renderal。请将JSFIDLE设置为当前状态。此处有一个自定义字体加载演示:它使用FontFaceObserver