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Implement math formula insertion tool using KaTeX #3
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| Original file line number | Diff line number | Diff line change | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|
@@ -3,11 +3,13 @@ | |||||||||||
| * - 1 textTool | ||||||||||||
| * - 2 rectTool | ||||||||||||
| * - 3 circleTool | ||||||||||||
| * - 4 mathsTool | ||||||||||||
| * ... | ||||||||||||
| */ | ||||||||||||
| var elID = tool = 0; | ||||||||||||
| var appSelector = "#app"; | ||||||||||||
| var contentSelector = appSelector + " .wbjs-content"; | ||||||||||||
| var mathInsertCoords = null; | ||||||||||||
|
|
||||||||||||
| // Helper: get page coordinates from mouse or touch event | ||||||||||||
| function getEventCoords(event) { | ||||||||||||
|
|
@@ -48,6 +50,10 @@ $(function(){ | |||||||||||
| tool = 3; | ||||||||||||
| $(contentSelector).css("cursor", "crosshair"); | ||||||||||||
| break; | ||||||||||||
| case "mathsTool": | ||||||||||||
| tool = 4; | ||||||||||||
| $(contentSelector).css("cursor", "crosshair"); | ||||||||||||
| break; | ||||||||||||
| //TODO: To be continued... | ||||||||||||
| } | ||||||||||||
| $(appSelector).css({"cursor": "text"}); | ||||||||||||
|
|
@@ -182,6 +188,12 @@ $(function(){ | |||||||||||
| newEl.resizable(); | ||||||||||||
| elID++; | ||||||||||||
| break; | ||||||||||||
| case 4: | ||||||||||||
| mathInsertCoords = { pageX: coords.pageX, pageY: coords.pageY, ctTop: ctTop, ctLeft: ctLeft }; | ||||||||||||
| $("#mathLatexInput").val(""); | ||||||||||||
| $("#mathPreview").html('<span class="text-muted">Preview will appear here</span>'); | ||||||||||||
| $("#mathModal").modal("show"); | ||||||||||||
| break; | ||||||||||||
| } | ||||||||||||
| } | ||||||||||||
|
|
||||||||||||
|
|
@@ -208,4 +220,69 @@ $(function(){ | |||||||||||
| } | ||||||||||||
| } | ||||||||||||
| }); | ||||||||||||
|
|
||||||||||||
| //-- Math formula modal: live preview | ||||||||||||
| $("#mathLatexInput").on("input", function() { | ||||||||||||
| var latex = $(this).val().trim(); | ||||||||||||
| if (latex) { | ||||||||||||
| try { | ||||||||||||
| katex.render(latex, document.getElementById("mathPreview"), { throwOnError: false, displayMode: true }); | ||||||||||||
| } catch(e) { | ||||||||||||
| $("#mathPreview").html('<span class="text-danger">Invalid formula</span>'); | ||||||||||||
| } | ||||||||||||
| } else { | ||||||||||||
| $("#mathPreview").html('<span class="text-muted">Preview will appear here</span>'); | ||||||||||||
| } | ||||||||||||
| }); | ||||||||||||
|
|
||||||||||||
| //-- Math formula modal: insert button | ||||||||||||
| $("#mathInsertBtn").on("click", function() { | ||||||||||||
| var latex = $("#mathLatexInput").val().trim(); | ||||||||||||
| if (!latex || !mathInsertCoords) return; | ||||||||||||
|
|
||||||||||||
| var rendered = $('<span></span>')[0]; | ||||||||||||
| try { | ||||||||||||
| katex.render(latex, rendered, { throwOnError: false, displayMode: true }); | ||||||||||||
| } catch(e) { | ||||||||||||
| return; | ||||||||||||
| } | ||||||||||||
|
|
||||||||||||
| var newEl = $(contentSelector).append( | ||||||||||||
| '<div class="wbjs-el" id="wbjs-el-'+elID+'">' + | ||||||||||||
| '<div class="btn btn-link position-absolute drg-btn"><i class="las la-arrows-alt"></i></div>' + | ||||||||||||
| '<div class="wbjs-math p-2"></div>' + | ||||||||||||
| '</div>' | ||||||||||||
| ).children(":last-child"); | ||||||||||||
|
|
||||||||||||
| newEl.find(".wbjs-math").append(rendered); | ||||||||||||
|
|
||||||||||||
| newEl.css({ | ||||||||||||
| "position": "absolute", | ||||||||||||
| "top": mathInsertCoords.ctTop + mathInsertCoords.pageY, | ||||||||||||
| "left": mathInsertCoords.ctLeft + mathInsertCoords.pageX | ||||||||||||
| }); | ||||||||||||
|
|
||||||||||||
| $("#mathModal").modal("hide"); | ||||||||||||
| $("#mouseTool").trigger("click"); | ||||||||||||
|
|
||||||||||||
| newEl.draggable({handle: "div.btn", scroll: false}); | ||||||||||||
| elID++; | ||||||||||||
| mathInsertCoords = null; | ||||||||||||
| }); | ||||||||||||
|
|
||||||||||||
| //-- Math formula modal: allow Enter key to insert | ||||||||||||
| $("#mathLatexInput").on("keydown", function(e) { | ||||||||||||
| if (e.key === "Enter") { | ||||||||||||
| e.preventDefault(); | ||||||||||||
| $("#mathInsertBtn").trigger("click"); | ||||||||||||
| } | ||||||||||||
| }); | ||||||||||||
|
|
||||||||||||
| //-- Math formula modal: reset tool on cancel | ||||||||||||
| $("#mathModal").on("hidden.bs.modal", function() { | ||||||||||||
| mathInsertCoords = null; | ||||||||||||
|
||||||||||||
| mathInsertCoords = null; | |
| mathInsertCoords = null; | |
| if (tool === 4) { | |
| $("#mouseTool").trigger("click"); | |
| } |
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The repo has two entrypoints:
src/index.html(served bysrc/app.js) and the rootindex.html(used for the GitHub Pages demo). This PR enablesmathsToolonly insrc/index.html; the rootindex.htmlstill has the maths button disabled and doesn’t load KaTeX, so the hosted demo won’t show this feature. Consider updating the rootindex.htmlas well (or consolidating to avoid duplicated UI).