getBBox()和getComputedTextLength()一旦起作用，一次就不起作用 [英] getBBox() and getComputedTextLength() once working, once not

问题描述

我正在使用d3.js + svg + javscript/typescript创建图表.我需要知道文本的长度，才能将其附加在适当的位置.

I am creating charts with d3.js+svg+javscript/typescript. I need to know length of texts to append it in proper places.

我正在使用/正在尝试使用功能getBBox()和getComputedTextLength()，但是... getBBoX仅在我第一次生成图表时(第二次生成图表，然后返回0)工作，而getComputedTextLength( )起作用...只是有时.由此看来，问题出在我尝试读取它的宽度/高度之前可能没有生成svgtext.

I am using/was trying to use functions getBBox() and getComputedTextLength(), but... getBBoX works only when I am generating chart for the first time (for second time and next it returns 0), while getComputedTextLength() works... just sometimes. From that what I read the problem could be that svgtext is not generated before I am trying to read its width/height.

    export function ReturnWidthOfText(text1, rotate, fontSize, someSVGGroup , fontName)
{

    var tempText;
    if (rotate == true) 
    {
        tempText = someSVGGroup.append("svg:text")
            .attr("id", "lolo")
            .style("font-size", fontSize + "px")
            .style("font-family", fontName)
            .attr("transform", "rotate(270)")
            .text(text1);
    }
    else
    {
        tempText = someSVGGroup.append("svg:text")
            .attr("id", "lolo")
            .style("font-size", fontSize + "px")
            .style("font-family", fontName)
            .text(text1);
    }

    var width = tempText.getComputedTextLength();

    document.getElementById("lolo").parentNode.removeChild(document.getElementById("lolo"))

    return width;
}    


    export function ReturnSizeOfText(text1, rotate,  fontSize, someSVGGroup, fontName) {

    //let svgText = document.getElementById("lolo");
    var tempText;

    if (rotate == "Yes") 
    {
        tempText = someSVGGroup.append("svg:text")
            .attr("id", "lolo")
            .style("font-size", fontSize + "px")
            .style("font-family", fontName)
            .attr("transform", "rotate(270)")
            .text(text1);
    }
    else
    {
        tempText = someSVGGroup.append("svg:text")
            .attr("id", "lolo")
            .style("font-size", fontSize + "px")
            .style("font-family", fontName)
            .text(text1);
    }

    let size;
    size = { Width: 0, Height: 0 };
    let element: any = document.getElementById("lolo");
    let bbox = element.getBBox();

    //console.log(text.node().getBBox());
    size.Width = bbox.width;
    size.Height = bbox.height;


    //var width = tempText.getComputedTextLength();

    document.getElementById("lolo").parentNode.removeChild(document.getElementById("lolo"))

    return size;


}    

有人可以建议如何改善这些功能以使其正常工作吗? 在准备"Office应用程序"时，我主要对IE和Edge的解决方案感兴趣.

Could anyone advise how to improve those functions to work properly? As I am preparing "App for Office" I am interested mainly in solution for IE and Edge.

推荐答案

我找到了答案.它返回0，因为仅当svg/html块可见时，它才返回良好结果，而当我尝试重新生成图表时，它被隐藏了.

I've found an answer. It was returning 0s, because it returns good results only when svg/html block is visible, while when I was trying to regenerate chart it was hidden.

这篇关于getBBox()和getComputedTextLength()一旦起作用，一次就不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！