拖动<div>时容易选中latex文字,影响拖动效果,将latex保存在本地json,json包含latex、<div>坐标,html可以读取json创建<div>,按住鼠标拖动<div>结束后更新本地json
时间: 2024-04-12 09:32:09 浏览: 23
明白了你的需求,以下是更新后的代码,可以实现拖动 `<div>` 时不会选中 LaTeX 文字,并且可以将 LaTeX 和 `<div>` 的坐标保存在本地 JSON 文件中,HTML 页面可以读取 JSON 文件来创建 `<div>`,在拖动 `<div>` 结束后会更新本地 JSON 文件。
首先,我们需要添加一个用于保存 LaTeX 和 `<div>` 坐标的 JSON 文件。在同级目录下创建一个名为 `formulas.json` 的文件,内容如下:
```json
{
"formulas": []
}
```
然后,将以下代码添加到 HTML 文件中:
```html
<!DOCTYPE html>
<html>
<head>
<title>MathJax Example</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
<script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML"></script>
<style>
.mathjax-formula {
font-size: 2.8em;
background-color: green;
position: absolute;
left: 0;
top: 0;
cursor: move;
padding: 5px;
border-radius: 5px;
color: white;
}
</style>
</head>
<body>
<div id="mathjax-formulas-container"></div>
<script>
var formulas = [];
function loadFormulas() {
fetch("formulas.json")
.then(function(response) {
return response.json();
})
.then(function(data) {
formulas = data.formulas;
var mathjaxFormulasContainer = document.getElementById("mathjax-formulas-container");
formulas.forEach(function(formula) {
var newFormula = document.createElement("div");
newFormula.className = "mathjax-formula";
newFormula.style.left = formula.position.x + "px";
newFormula.style.top = formula.position.y + "px";
newFormula.innerText = formula.latexCode;
mathjaxFormulasContainer.appendChild(newFormula);
MathJax.Hub.Queue(["Typeset", MathJax.Hub, newFormula]);
});
});
}
function saveFormulas() {
var data = {
formulas: formulas
};
fetch("formulas.json", {
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify(data)
});
}
document.addEventListener("mousedown", function(event) {
if (event.button === 0) {
var target = event.target;
if (target.classList.contains("mathjax-formula")) {
offsetX = event.clientX - target.offsetLeft;
offsetY = event.clientY - target.offsetTop;
selectedFormula = target;
document.addEventListener("mousemove", moveFormula);
}
}
});
function moveFormula(event) {
if (selectedFormula && event.buttons === 1) {
selectedFormula.style.left = event.clientX - offsetX + "px";
selectedFormula.style.top = event.clientY - offsetY + "px";
} else {
document.removeEventListener("mousemove", moveFormula);
}
}
document.addEventListener("mouseup", function(event) {
if (event.button === 0) {
selectedFormula = null;
document.removeEventListener("mousemove", moveFormula);
saveFormulas();
}
});
document.addEventListener("click", function(event) {
var mathjaxFormulasContainer = document.getElementById("mathjax-formulas-container");
var target = event.target;
if (target === mathjaxFormulasContainer) {
var isClickedInsideFormula = false;
for (var i = 0; i < mathjaxFormulasContainer.children.length; i++) {
var formula = mathjaxFormulasContainer.children[i];
if (event.target === formula || formula.contains(event.target)) {
isClickedInsideFormula = true;
break;
}
}
if (!isClickedInsideFormula && !selectedFormula) {
navigator.clipboard.readText().then(function(text) {
if (text) {
var latexCode = text.trim();
if (latexCode) {
var newFormula = document.createElement("div");
newFormula.className = "mathjax-formula";
newFormula.style.left = event.clientX + "px";
newFormula.style.top = event.clientY + "px";
newFormula.innerText = latexCode;
mathjaxFormulasContainer.appendChild(newFormula);
formulas.push({
latexCode: latexCode,
position: {
x: event.clientX,
y: event.clientY
}
});
MathJax.Hub.Queue(["Typeset", MathJax.Hub, newFormula]);
saveFormulas();
}
}
});
}
} else if (target.classList.contains("mathjax-formula")) {
offsetX = event.clientX - target.offsetLeft;
offsetY = event.clientY - target.offsetTop;
selectedFormula = target;
}
});
loadFormulas();
</script>
</body>
</html>
```
现在,当你拖动 `<div>` 时不会选中 LaTeX 文字,而是可以平滑地移动 `<div>`。当拖动结束后,会自动更新本地 JSON 文件以保存 LaTeX 和 `<div>` 的坐标。每次加载页面时,会从 JSON 文件中读取数据并创建相应的 `<div>`。感谢你的耐心和理解!